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description Publicationkeyboard_double_arrow_right Article 2018 France, Italy, ItalyPublisher:Elsevier BV Fulvio Franchi; Andrea Bergamasco; Cristina Da Lio; Sandra Donnici; Claudio Mazzoli; Paolo Montagna; Marco Taviani; Luigi Tosi; Massimo Zecchin;Abstract A peculiar type of marine rocky outcrops is generated under temperate conditions through the cementation of carbonate and siliciclastic sediments on the northwestern Adriatic shelf. The lithification process results into the genesis of punctiform outcrops (tegnue) that serve as substrate to substantial coralligenous epibenthic growth. These buildups have been often described as beachrock. More recently, an alternative genetic mechanism, implying precipitation of carbonate cements in the marine phreatic zone, has been hypothesized for the rocky outcrops off the coast of Chioggia (south of Venice). These rocky outcrops are settled along the levee of meandering channels inherited from Pleistocene fluvial systems. Petrographic analyses of the Chioggia rocky outcrops allowed distinguishing three (3) main lithofacies: 1) biofouled sandstone blocks; 2) cross-stratified slabs and 3) bioclastic carbonates. These lithofacies have a common substrate mainly made by allochemic sandstone and sandy allochem limestone consisting in rounded grains of limestones and dolostones. The host sediments are cemented by a thin micrite coating followed by isopachous rims of scalenohedral and bladed calcite. Geochemical analyses revealed a sensible decrease in Mg contents between the early and late generations of isopachous cements. Vadose cements are missing suggesting that the precipitation of calcite cements occurred in marine phreatic zone without supra-tidal exposure. The lack of aragonite cements suggests that seawater was mixing with meteoric groundwater. The mixing of groundwater induced a partial dissolution of high-Mg calcite and precipitation of a later stage low-Mg calcite. The lithification of the morphologies inherited from Pleistocene fluvial systems provided the nucleus for the development of the coralligenous buildups observed in the North Adriatic Sea shelf. It is possible that diagenetic processes, other than those normally responsible for the formation of beachrocks worldwide, have been active in the northern Adriatic Sea starting from the post-Last Glacial Maximum transgression. It is therefore likely that these processes are more relevant for the coralligenous epibenthic growth in temperate siliciclastic shelves than previously thought.
CNR ExploRA arrow_drop_down Marine and Petroleum GeologyArticle . 2018 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefHAL Descartes; HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2018add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.marpetgeo.2018.01.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu5 citations 5 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert CNR ExploRA arrow_drop_down Marine and Petroleum GeologyArticle . 2018 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefHAL Descartes; HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2018add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.marpetgeo.2018.01.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2015 Germany, Italy, France, FrancePublisher:Elsevier BV Funded by:EC | COCONETEC| COCONETLorenzo Angeletti; Simonepietro Canese; Fulvio Franchi; Paolo Montagna; Joachim Reitner; Eric Otto Walliser; Marco Taviani;A spectacular field of columnar carbonates has been discovered on the Montenegrin margin in the southern Adriatic Sea at a depth of about 450 m. The site exposes many columnar carbonates protruding from the substrate or abated on the bottom. Such carbonates attain maximum visible lengths of ca. 60 cm with diameters up to 20 cm; display an annular growth, and are either hollow or plugged by indurated sediment. Petrographic and geochemical analyses document the pervasive presence of dolomite, and delta C-13 values as low as -30%(0) VPDB. These 'chimneys' are therefore interpreted as former conduits related to hydrocarbon expulsion in this sector of the Adriatic basin. However, available data suggest that hydrocarbon flows at this site have ceased. Our results show that chimneys formed inside the local depositional units, glacial Pleistocene shelf shelly-rich muddy sediment and were successively exhumed from the host sediment. Today, the chimneys offer substrate to benthic life, including cold water corals and sponges. The U-series dating of these carbonate concretions is complicated by the presence of a significant fraction of detrital sediment, which represents a major source of initial Th-230. AMS-C-14 and Sr-87/Sr-86 dating of shells embedded in one of the chimney provided ages beyond the range of radiocarbon dating and <600 kyrs, indicating a Pleistocene age of the host sediment. Uncorrected U-series dating of the carbonate chimneys yielded and age of ca. 250-270 kyrs, providing a temporal upper limit for conduit formation driven by lithification caused by the degradation of seeping hydrocarbons. In addition, U/Th dating of cold water coral bases settled on chimneys indicates a Holocene age for their first exposure after exhumation and subsequent function as hard substrate for benthic organisms. The Montenegrin 'chimney forest' is a rare case where many such carbonate columnar concretions are still in their original vertical position. (C) 2015 Elsevier Ltd. All rights reserved.
Publikationenserver ... arrow_drop_down Publikationenserver der Georg-August-Universität GöttingenArticle . 2018Marine and Petroleum GeologyOther literature type . Article . 2015 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu35 citations 35 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Publikationenserver ... arrow_drop_down Publikationenserver der Georg-August-Universität GöttingenArticle . 2018Marine and Petroleum GeologyOther literature type . Article . 2015 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2012 United States, United States, FrancePublisher:Springer Science and Business Media LLC Funded by:NIH | Population mixture in evo..., NIH | African Odyssey: An Integ..., NSF | Collaborative Research: G... +2 projectsNIH| Population mixture in evolutionary and medical genetics ,NIH| African Odyssey: An Integrative Genomics Analysis of Complex Physiologic Traits ,NSF| Collaborative Research: Genetic Bases for the Evolution of Human Diet ,NIH| Variation at Malaria Resistance Genes in Africans ,NSF| A new history and geography of human genes informed by ancient DNAJoseph K. Pickrell; Nick Patterson; Chiara Barbieri; Falko Berthold; Linda Gerlach; Tom Güldemann; Blesswell Kure; Sununguko Wata Mpoloka; Hirosi Nakagawa; Christfried Naumann; Mark Lipson; Po-Ru Loh; Joseph Lachance; Joanna L. Mountain; Carlos Bustamante; Bonnie Berger; Sarah A. Tishkoff; Brenna M. Henn; Mark Stoneking; David Reich; Brigitte Pakendorf;pmid: 23072811
pmc: PMC3493647
Southern and eastern African populations that speak non-Bantu languages with click consonants are known to harbour some of the most ancient genetic lineages in humans, but their relationships are poorly understood. Here, we report data from 23 populations analyzed at over half a million single nucleotide polymorphisms, using a genome-wide array designed for studying human history. The southern African Khoisan fall into two genetic groups, loosely corresponding to the northwestern and southeastern Kalahari, which we show separated within the last 30,000 years. We find that all individuals derive at least a few percent of their genomes from admixture with non-Khoisan populations that began approximately 1,200 years ago. In addition, the east African Hadza and Sandawe derive a fraction of their ancestry from admixture with a population related to the Khoisan, supporting the hypothesis of an ancient link between southern and eastern Africa To appear in Nature Communications
HAL-Inserm; Mémoires... arrow_drop_down Europe PubMed CentralArticle . 2012Full-Text: http://europepmc.org/articles/PMC3493647Data sources: PubMed CentralarXiv.org e-Print ArchiveOther literature type . Preprint . 2012Data sources: arXiv.org e-Print ArchiveeScholarship - University of CaliforniaArticle . 2012Data sources: eScholarship - University of Californiahttps://doi.org/10.48550/arxiv...Article . 2012License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms2140&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 247 citations 247 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!more_vert HAL-Inserm; Mémoires... arrow_drop_down Europe PubMed CentralArticle . 2012Full-Text: http://europepmc.org/articles/PMC3493647Data sources: PubMed CentralarXiv.org e-Print ArchiveOther literature type . Preprint . 2012Data sources: arXiv.org e-Print ArchiveeScholarship - University of CaliforniaArticle . 2012Data sources: eScholarship - University of Californiahttps://doi.org/10.48550/arxiv...Article . 2012License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2006Publisher:Elsevier BV Milesi, J.P.; Toteu, S.F.; Deschamps, Y.; Feybesse, J.L.; Lerouge, Catherine; Cocherie, A.; Penaye, J.; Tchameni, R.; Moloto-A-Kenguemba, G.; Kampunzu, H.A.B.; Nicol, N.; Duguey, E.; Leistel, J.M.; Saint-Martin, M.; Ralay, F.; Heinry, C.; Bouchot, Vincent; Doumnang Mbaigane, J.C.; Kanda Kula, V.; Chene, F.; Monthel, J.; Boutin, P.; Cailteux, J.;International audience; This paper is prepared within the frameworks of IGCP Project 470 and the associated BRGM scientific project “Africa 1999–2004” to accompany the 1:4,000,000 scale map “Geology and major ore deposits of Central Africa, presented at the 20th Colloquium of African Geology in Orleans in June 2004. It incorporates geological and metallogenic data from eight countries in Central Africa (Angola, Cameroon, Chad, Central African Republic, Congo Brazzaville, Democratic Republic of Congo (DRC), Equatorial Guinea and Zambia). The map is a harmonised and geo-referenced preliminary map, based on a GIS at 1:2,000,000 scale, and focusses on the spatial and temporal distribution of selected major deposits.
Journal of African E... arrow_drop_down Journal of African Earth SciencesArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.jafrearsci.2005.10.016&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu59 citations 59 popularity Top 10% influence Top 10% impulse Average Powered by BIP!more_vert Journal of African E... arrow_drop_down Journal of African Earth SciencesArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.jafrearsci.2005.10.016&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2005 FrancePublisher:Elsevier BV Authors: P. Huntsman-Mapila; Ali B Kampunzu; Bernard Vink; Susan Ringrose;P. Huntsman-Mapila; Ali B Kampunzu; Bernard Vink; Susan Ringrose;The siliciclastic sediments of the Okavango inland Delta of northwest Botswana have a modal composition of quartz arenites and result from a complex history, including transport by river and deposition in a nascent rift basin located in a desert environment with input of aeolian sands. The geochemical composition of sediments from the Okavango Delta was determined in order to constrain the role of weathering at the source and the composition of the source rocks. The chemical analyses and the interelement ratios show a broad compositional range usually encompassing the PAAS composition. The chemical index of alteration (CIA) values and the A–CN–K diagram define an evolution trend which can be interpreted using a mixing model involving a strongly weathered component which corresponds to the sedimentary fraction transported by the Okavango River and a relatively immature component which corresponds to the aeolian sand component of the Okavango sediments. Field geological data supported by geochemical ratios involving elements with affinity for mafic–ultramafic and felsic rocks such as Th/Cr, Th/Sc, La/Sc, La/Co and Eu/Eu* support a source area including mafic–ultramafic and felsic rocks, with or without intermediate rocks. The relationships between certain elements (Cr–Ni, Na2O–Al2O3, K2O–Al2O3) refine the interpretation by pointing to the existence of at least three source rock end-members, including a felsic rock source and pyroxene-rich and olivine-rich mafic–ultramafic source rocks. Proterozoic granitoid–gabbro and related volcanic and ortho-metamorphic rock complexes exposed in NW Botswana and adjacent Angola and Namibia are the source rocks of the sediment component which was mixed with aeolian sand and interacted with a variable proportion of diagenetic carbonates to produce the Okavango sediments.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu61 citations 61 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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description Publicationkeyboard_double_arrow_right Article 2018 France, Italy, ItalyPublisher:Elsevier BV Fulvio Franchi; Andrea Bergamasco; Cristina Da Lio; Sandra Donnici; Claudio Mazzoli; Paolo Montagna; Marco Taviani; Luigi Tosi; Massimo Zecchin;Abstract A peculiar type of marine rocky outcrops is generated under temperate conditions through the cementation of carbonate and siliciclastic sediments on the northwestern Adriatic shelf. The lithification process results into the genesis of punctiform outcrops (tegnue) that serve as substrate to substantial coralligenous epibenthic growth. These buildups have been often described as beachrock. More recently, an alternative genetic mechanism, implying precipitation of carbonate cements in the marine phreatic zone, has been hypothesized for the rocky outcrops off the coast of Chioggia (south of Venice). These rocky outcrops are settled along the levee of meandering channels inherited from Pleistocene fluvial systems. Petrographic analyses of the Chioggia rocky outcrops allowed distinguishing three (3) main lithofacies: 1) biofouled sandstone blocks; 2) cross-stratified slabs and 3) bioclastic carbonates. These lithofacies have a common substrate mainly made by allochemic sandstone and sandy allochem limestone consisting in rounded grains of limestones and dolostones. The host sediments are cemented by a thin micrite coating followed by isopachous rims of scalenohedral and bladed calcite. Geochemical analyses revealed a sensible decrease in Mg contents between the early and late generations of isopachous cements. Vadose cements are missing suggesting that the precipitation of calcite cements occurred in marine phreatic zone without supra-tidal exposure. The lack of aragonite cements suggests that seawater was mixing with meteoric groundwater. The mixing of groundwater induced a partial dissolution of high-Mg calcite and precipitation of a later stage low-Mg calcite. The lithification of the morphologies inherited from Pleistocene fluvial systems provided the nucleus for the development of the coralligenous buildups observed in the North Adriatic Sea shelf. It is possible that diagenetic processes, other than those normally responsible for the formation of beachrocks worldwide, have been active in the northern Adriatic Sea starting from the post-Last Glacial Maximum transgression. It is therefore likely that these processes are more relevant for the coralligenous epibenthic growth in temperate siliciclastic shelves than previously thought.
CNR ExploRA arrow_drop_down Marine and Petroleum GeologyArticle . 2018 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefHAL Descartes; HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2018add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.marpetgeo.2018.01.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu5 citations 5 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert CNR ExploRA arrow_drop_down Marine and Petroleum GeologyArticle . 2018 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefHAL Descartes; HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2018add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.marpetgeo.2018.01.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2015 Germany, Italy, France, FrancePublisher:Elsevier BV Funded by:EC | COCONETEC| COCONETLorenzo Angeletti; Simonepietro Canese; Fulvio Franchi; Paolo Montagna; Joachim Reitner; Eric Otto Walliser; Marco Taviani;A spectacular field of columnar carbonates has been discovered on the Montenegrin margin in the southern Adriatic Sea at a depth of about 450 m. The site exposes many columnar carbonates protruding from the substrate or abated on the bottom. Such carbonates attain maximum visible lengths of ca. 60 cm with diameters up to 20 cm; display an annular growth, and are either hollow or plugged by indurated sediment. Petrographic and geochemical analyses document the pervasive presence of dolomite, and delta C-13 values as low as -30%(0) VPDB. These 'chimneys' are therefore interpreted as former conduits related to hydrocarbon expulsion in this sector of the Adriatic basin. However, available data suggest that hydrocarbon flows at this site have ceased. Our results show that chimneys formed inside the local depositional units, glacial Pleistocene shelf shelly-rich muddy sediment and were successively exhumed from the host sediment. Today, the chimneys offer substrate to benthic life, including cold water corals and sponges. The U-series dating of these carbonate concretions is complicated by the presence of a significant fraction of detrital sediment, which represents a major source of initial Th-230. AMS-C-14 and Sr-87/Sr-86 dating of shells embedded in one of the chimney provided ages beyond the range of radiocarbon dating and <600 kyrs, indicating a Pleistocene age of the host sediment. Uncorrected U-series dating of the carbonate chimneys yielded and age of ca. 250-270 kyrs, providing a temporal upper limit for conduit formation driven by lithification caused by the degradation of seeping hydrocarbons. In addition, U/Th dating of cold water coral bases settled on chimneys indicates a Holocene age for their first exposure after exhumation and subsequent function as hard substrate for benthic organisms. The Montenegrin 'chimney forest' is a rare case where many such carbonate columnar concretions are still in their original vertical position. (C) 2015 Elsevier Ltd. All rights reserved.
Publikationenserver ... arrow_drop_down Publikationenserver der Georg-August-Universität GöttingenArticle . 2018Marine and Petroleum GeologyOther literature type . Article . 2015 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu35 citations 35 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Publikationenserver ... arrow_drop_down Publikationenserver der Georg-August-Universität GöttingenArticle . 2018Marine and Petroleum GeologyOther literature type . Article . 2015 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.marpetgeo.2015.04.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2012 United States, United States, FrancePublisher:Springer Science and Business Media LLC Funded by:NIH | Population mixture in evo..., NIH | African Odyssey: An Integ..., NSF | Collaborative Research: G... +2 projectsNIH| Population mixture in evolutionary and medical genetics ,NIH| African Odyssey: An Integrative Genomics Analysis of Complex Physiologic Traits ,NSF| Collaborative Research: Genetic Bases for the Evolution of Human Diet ,NIH| Variation at Malaria Resistance Genes in Africans ,NSF| A new history and geography of human genes informed by ancient DNAJoseph K. Pickrell; Nick Patterson; Chiara Barbieri; Falko Berthold; Linda Gerlach; Tom Güldemann; Blesswell Kure; Sununguko Wata Mpoloka; Hirosi Nakagawa; Christfried Naumann; Mark Lipson; Po-Ru Loh; Joseph Lachance; Joanna L. Mountain; Carlos Bustamante; Bonnie Berger; Sarah A. Tishkoff; Brenna M. Henn; Mark Stoneking; David Reich; Brigitte Pakendorf;pmid: 23072811
pmc: PMC3493647
Southern and eastern African populations that speak non-Bantu languages with click consonants are known to harbour some of the most ancient genetic lineages in humans, but their relationships are poorly understood. Here, we report data from 23 populations analyzed at over half a million single nucleotide polymorphisms, using a genome-wide array designed for studying human history. The southern African Khoisan fall into two genetic groups, loosely corresponding to the northwestern and southeastern Kalahari, which we show separated within the last 30,000 years. We find that all individuals derive at least a few percent of their genomes from admixture with non-Khoisan populations that began approximately 1,200 years ago. In addition, the east African Hadza and Sandawe derive a fraction of their ancestry from admixture with a population related to the Khoisan, supporting the hypothesis of an ancient link between southern and eastern Africa To appear in Nature Communications
HAL-Inserm; Mémoires... arrow_drop_down Europe PubMed CentralArticle . 2012Full-Text: http://europepmc.org/articles/PMC3493647Data sources: PubMed CentralarXiv.org e-Print ArchiveOther literature type . Preprint . 2012Data sources: arXiv.org e-Print ArchiveeScholarship - University of CaliforniaArticle . 2012Data sources: eScholarship - University of Californiahttps://doi.org/10.48550/arxiv...Article . 2012License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms2140&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 247 citations 247 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!more_vert HAL-Inserm; Mémoires... arrow_drop_down Europe PubMed CentralArticle . 2012Full-Text: http://europepmc.org/articles/PMC3493647Data sources: PubMed CentralarXiv.org e-Print ArchiveOther literature type . Preprint . 2012Data sources: arXiv.org e-Print ArchiveeScholarship - University of CaliforniaArticle . 2012Data sources: eScholarship - University of Californiahttps://doi.org/10.48550/arxiv...Article . 2012License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms2140&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2006Publisher:Elsevier BV Milesi, J.P.; Toteu, S.F.; Deschamps, Y.; Feybesse, J.L.; Lerouge, Catherine; Cocherie, A.; Penaye, J.; Tchameni, R.; Moloto-A-Kenguemba, G.; Kampunzu, H.A.B.; Nicol, N.; Duguey, E.; Leistel, J.M.; Saint-Martin, M.; Ralay, F.; Heinry, C.; Bouchot, Vincent; Doumnang Mbaigane, J.C.; Kanda Kula, V.; Chene, F.; Monthel, J.; Boutin, P.; Cailteux, J.;International audience; This paper is prepared within the frameworks of IGCP Project 470 and the associated BRGM scientific project “Africa 1999–2004” to accompany the 1:4,000,000 scale map “Geology and major ore deposits of Central Africa, presented at the 20th Colloquium of African Geology in Orleans in June 2004. It incorporates geological and metallogenic data from eight countries in Central Africa (Angola, Cameroon, Chad, Central African Republic, Congo Brazzaville, Democratic Republic of Congo (DRC), Equatorial Guinea and Zambia). The map is a harmonised and geo-referenced preliminary map, based on a GIS at 1:2,000,000 scale, and focusses on the spatial and temporal distribution of selected major deposits.
Journal of African E... arrow_drop_down Journal of African Earth SciencesArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.jafrearsci.2005.10.016&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu59 citations 59 popularity Top 10% influence Top 10% impulse Average Powered by BIP!more_vert Journal of African E... arrow_drop_down Journal of African Earth SciencesArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.jafrearsci.2005.10.016&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2005 FrancePublisher:Elsevier BV Authors: P. Huntsman-Mapila; Ali B Kampunzu; Bernard Vink; Susan Ringrose;P. Huntsman-Mapila; Ali B Kampunzu; Bernard Vink; Susan Ringrose;The siliciclastic sediments of the Okavango inland Delta of northwest Botswana have a modal composition of quartz arenites and result from a complex history, including transport by river and deposition in a nascent rift basin located in a desert environment with input of aeolian sands. The geochemical composition of sediments from the Okavango Delta was determined in order to constrain the role of weathering at the source and the composition of the source rocks. The chemical analyses and the interelement ratios show a broad compositional range usually encompassing the PAAS composition. The chemical index of alteration (CIA) values and the A–CN–K diagram define an evolution trend which can be interpreted using a mixing model involving a strongly weathered component which corresponds to the sedimentary fraction transported by the Okavango River and a relatively immature component which corresponds to the aeolian sand component of the Okavango sediments. Field geological data supported by geochemical ratios involving elements with affinity for mafic–ultramafic and felsic rocks such as Th/Cr, Th/Sc, La/Sc, La/Co and Eu/Eu* support a source area including mafic–ultramafic and felsic rocks, with or without intermediate rocks. The relationships between certain elements (Cr–Ni, Na2O–Al2O3, K2O–Al2O3) refine the interpretation by pointing to the existence of at least three source rock end-members, including a felsic rock source and pyroxene-rich and olivine-rich mafic–ultramafic source rocks. Proterozoic granitoid–gabbro and related volcanic and ortho-metamorphic rock complexes exposed in NW Botswana and adjacent Angola and Namibia are the source rocks of the sediment component which was mixed with aeolian sand and interacted with a variable proportion of diagenetic carbonates to produce the Okavango sediments.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.sedgeo.2004.11.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu61 citations 61 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.sedgeo.2004.11.001&type=result"></script>'); --> </script>
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