High-resolution fluvial records of Holocene environmental changes in the Sahel: the Yamé River at Ounjougou (Mali, West-Africa)
Identifieur interne : 000156 ( Hal/Curation ); précédent : 000155; suivant : 000157High-resolution fluvial records of Holocene environmental changes in the Sahel: the Yamé River at Ounjougou (Mali, West-Africa)
Auteurs : Laurent Lespez [France] ; Yann Le Drezen [France] ; Garnier Aline [France] ; Michel Rasse [France] ; Barbara Eichhorn [Allemagne] ; Sylvain Ozainne [France] ; Aziz Ballouche [France] ; Katharina Neumann [Allemagne] ; Eric HuysecomSource :
- Quaternary Science Reviews [ 0277-3791 ] ; 2011.
Abstract
The Yamé river, in the Bandiagara Plateau, Dogon Country, Mali, is characterised by extensive alluvial sedimentary records, particularly in the 1 km long Ounjougou reach where Holocene floodplain pockets are inset in the Pleistocene formations. These alluvial records have been investigated via geomorphologic fieldwork and sedimentologic and micromorphologic analyses and are supported by 79 radiocarbon dates. The alluvial deposits of the valley floor correspond to a vertical accretion of 3e10 m. The reconstruction of fluvial style changes provides evidence of four main aggradation periods. From 11,500 to 8760 cal. BP, the alluvial architecture and grain-size parameters indicate a wandering river. This period included phases of pulsed high-energy floods and avulsion related to a northward shift of the summer monsoon to around 14 N after 11,500 cal. BP. From 7800 to 5300 cal. BP, a swampy floodplain environment with standing water pools within a Sudanian savanna/woodland mosaic corresponds to the culmination of the Holocene humid period. From 3800 cal. BP onwards, rhythmic sedimentation attests to an increase in the duration and/or intensity of the dry season, giving a precise date for the local termination of the Holocene Optimum period. During the last two millennia and for the first time during the Holocene, the alluvial formations are progressively restricted whereas the colluvial deposits increase, indicating strong soil erosion and redeposition within the watershed related to an increase in human impact. Four major periods are characterised by incision (I1: ante 11,500, I2: 8760e7800; I3: 6790e6500 cal. BP; I4; 2400e1700 cal. BP) pointing to dramatic changes in fluvial style. They result from high-energy flood flows during dry spells and confirm the capacity of the floodplain pocket in the upstream reach of the Sahelian belt to record rapid Holocene climatic change.
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These alluvial records have been investigated via geomorphologic fieldwork and sedimentologic and micromorphologic analyses and are supported by 79 radiocarbon dates. The alluvial deposits of the valley floor correspond to a vertical accretion of 3e10 m. The reconstruction of fluvial style changes provides evidence of four main aggradation periods. From 11,500 to 8760 cal. BP, the alluvial architecture and grain-size parameters indicate a wandering river. This period included phases of pulsed high-energy floods and avulsion related to a northward shift of the summer monsoon to around 14 N after 11,500 cal. BP. From 7800 to 5300 cal. BP, a swampy floodplain environment with standing water pools within a Sudanian savanna/woodland mosaic corresponds to the culmination of the Holocene humid period. From 3800 cal. BP onwards, rhythmic sedimentation attests to an increase in the duration and/or intensity of the dry season, giving a precise date for the local termination of the Holocene Optimum period. During the last two millennia and for the first time during the Holocene, the alluvial formations are progressively restricted whereas the colluvial deposits increase, indicating strong soil erosion and redeposition within the watershed related to an increase in human impact. Four major periods are characterised by incision (I1: ante 11,500, I2: 8760e7800; I3: 6790e6500 cal. BP; I4; 2400e1700 cal. BP) pointing to dramatic changes in fluvial style. They result from high-energy flood flows during dry spells and confirm the capacity of the floodplain pocket in the upstream reach of the Sahelian belt to record rapid Holocene climatic change.</div></front></TEI><hal api="V3"><titleStmt><title xml:lang="en">High-resolution fluvial records of Holocene environmental changes in the Sahel: the Yamé River at Ounjougou (Mali, West-Africa)</title><author role="aut"><persName><forename type="first">Laurent</forename><surname>Lespez</surname></persName><email>laurent.lespez@unicaen.fr</email><idno type="idhal">lespez</idno><idno type="halauthor">309814</idno><idno type="ORCID">http://orcid.org/0000-0003-3256-1999</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Yann</forename><surname>Le Drezen</surname></persName><email></email><idno type="halauthor">444539</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Garnier</forename><surname>Aline</surname></persName><email></email><idno type="halauthor">718063</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Michel</forename><surname>Rasse</surname></persName><email></email><idno type="halauthor">444538</idno><affiliation ref="#struct-97036"></affiliation></author><author role="aut"><persName><forename type="first">Barbara</forename><surname>Eichhorn</surname></persName><email></email><idno type="halauthor">444677</idno><affiliation ref="#struct-135162"></affiliation></author><author role="aut"><persName><forename type="first">Sylvain</forename><surname>Ozainne</surname></persName><email></email><idno type="halauthor">444676</idno><affiliation ref="#struct-103706"></affiliation></author><author role="aut"><persName><forename type="first">Aziz</forename><surname>Ballouche</surname></persName><email></email><idno type="idhal">aziz-ballouche</idno><idno type="halauthor">169329</idno><affiliation ref="#struct-182978"></affiliation></author><author role="aut"><persName><forename type="first">Katharina</forename><surname>Neumann</surname></persName><email></email><idno type="halauthor">163761</idno><affiliation ref="#struct-103701"></affiliation></author><author role="aut"><persName><forename type="first">Eric</forename><surname>Huysecom</surname></persName><email></email><idno type="halauthor">444541</idno></author><editor role="depositor"><persName><forename>Laurent</forename><surname>Lespez</surname></persName><email>laurent.lespez@u-pec.fr</email></editor><funder ref="#projanr-3920"></funder></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2012-04-30 17:07:54</date><date type="whenWritten">2011</date><date type="whenModified">2015-10-12 13:44:56</date><date type="whenReleased">2012-04-30 17:07:54</date><date type="whenProduced">2011</date></edition><respStmt><resp>contributor</resp><name key="127357"><persName><forename>Laurent</forename><surname>Lespez</surname></persName><email>laurent.lespez@u-pec.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">hal-00692520</idno><idno type="halUri">https://hal.archives-ouvertes.fr/hal-00692520</idno><idno type="halBibtex">lespez:hal-00692520</idno><idno type="halRefHtml">Quaternary Science Reviews, Elsevier, 2011, 30 (5-6), pp.737-756</idno><idno type="halRef">Quaternary Science Reviews, Elsevier, 2011, 30 (5-6), pp.737-756</idno></publicationStmt><seriesStmt><idno type="stamp" n="SDE">Sciences De l'Environnement</idno><idno type="stamp" n="UNIV-NANTES">Université de Nantes</idno><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="UNIV-CAEN">Université de Caen</idno><idno type="stamp" n="UNIV-ANGERS">Université d'Angers</idno><idno type="stamp" n="UNIV-LEHAVRE">Université du Havre</idno><idno type="stamp" n="UNIV-ROUEN">Université de Rouen</idno><idno type="stamp" n="UNIV-BREST">Université de Bretagne occidentale - Brest</idno><idno type="stamp" n="LETG">Littoral, environnement, télédétection, géomatique</idno><idno type="stamp" n="GIP-BE">GIP Bretagne Environnement</idno><idno type="stamp" n="COMUE-NORMANDIE">Normandie Université</idno><idno type="stamp" n="LETG-GEOPHEN" p="LETG">LETG-GEOPHEN</idno><idno type="stamp" n="LETG-LEESA" p="LETG">LETG-LEESA</idno><idno type="stamp" n="UR2-HB">Université Rennes 2 - Haute Bretagne</idno></seriesStmt><notesStmt><note type="audience" n="2">International</note><note type="popular" n="0">No</note><note type="peer" n="1">Yes</note></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">High-resolution fluvial records of Holocene environmental changes in the Sahel: the Yamé River at Ounjougou (Mali, West-Africa)</title><author role="aut"><persName><forename type="first">Laurent</forename><surname>Lespez</surname></persName><email>laurent.lespez@unicaen.fr</email><idno type="idHal">lespez</idno><idno type="halAuthorId">309814</idno><idno type="ORCID">http://orcid.org/0000-0003-3256-1999</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Yann</forename><surname>Le Drezen</surname></persName><idno type="halAuthorId">444539</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Garnier</forename><surname>Aline</surname></persName><idno type="halAuthorId">718063</idno><affiliation ref="#struct-929"></affiliation></author><author role="aut"><persName><forename type="first">Michel</forename><surname>Rasse</surname></persName><idno type="halAuthorId">444538</idno><affiliation ref="#struct-97036"></affiliation></author><author role="aut"><persName><forename type="first">Barbara</forename><surname>Eichhorn</surname></persName><idno type="halAuthorId">444677</idno><affiliation ref="#struct-135162"></affiliation></author><author role="aut"><persName><forename type="first">Sylvain</forename><surname>Ozainne</surname></persName><idno type="halAuthorId">444676</idno><affiliation ref="#struct-103706"></affiliation></author><author role="aut"><persName><forename type="first">Aziz</forename><surname>Ballouche</surname></persName><idno type="idHal">aziz-ballouche</idno><idno type="halAuthorId">169329</idno><affiliation ref="#struct-182978"></affiliation></author><author role="aut"><persName><forename type="first">Katharina</forename><surname>Neumann</surname></persName><idno type="halAuthorId">163761</idno><affiliation ref="#struct-103701"></affiliation></author><author role="aut"><persName><forename type="first">Eric</forename><surname>Huysecom</surname></persName><idno type="halAuthorId">444541</idno></author></analytic><monogr><idno type="halJournalId" status="VALID">18466</idno><idno type="issn">0277-3791</idno><title level="j">Quaternary Science Reviews</title><imprint><publisher>Elsevier</publisher><biblScope unit="volume">30</biblScope><biblScope unit="issue">5-6</biblScope><biblScope unit="pp">737-756</biblScope><date type="datePub">2011</date></imprint></monogr></biblStruct></sourceDesc><profileDesc><langUsage><language ident="en">English</language></langUsage><textClass><classCode scheme="halDomain" n="sde.es">Environmental Sciences/Environmental and Society</classCode><classCode scheme="halTypology" n="ART">Journal articles</classCode></textClass><abstract xml:lang="en">The Yamé river, in the Bandiagara Plateau, Dogon Country, Mali, is characterised by extensive alluvial sedimentary records, particularly in the 1 km long Ounjougou reach where Holocene floodplain pockets are inset in the Pleistocene formations. These alluvial records have been investigated via geomorphologic fieldwork and sedimentologic and micromorphologic analyses and are supported by 79 radiocarbon dates. The alluvial deposits of the valley floor correspond to a vertical accretion of 3e10 m. The reconstruction of fluvial style changes provides evidence of four main aggradation periods. From 11,500 to 8760 cal. BP, the alluvial architecture and grain-size parameters indicate a wandering river. This period included phases of pulsed high-energy floods and avulsion related to a northward shift of the summer monsoon to around 14 N after 11,500 cal. BP. From 7800 to 5300 cal. BP, a swampy floodplain environment with standing water pools within a Sudanian savanna/woodland mosaic corresponds to the culmination of the Holocene humid period. From 3800 cal. BP onwards, rhythmic sedimentation attests to an increase in the duration and/or intensity of the dry season, giving a precise date for the local termination of the Holocene Optimum period. During the last two millennia and for the first time during the Holocene, the alluvial formations are progressively restricted whereas the colluvial deposits increase, indicating strong soil erosion and redeposition within the watershed related to an increase in human impact. Four major periods are characterised by incision (I1: ante 11,500, I2: 8760e7800; I3: 6790e6500 cal. BP; I4; 2400e1700 cal. BP) pointing to dramatic changes in fluvial style. They result from high-energy flood flows during dry spells and confirm the capacity of the floodplain pocket in the upstream reach of the Sahelian belt to record rapid Holocene climatic change.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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