untitled
<OAI-PMH schemaLocation=http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd>
<responseDate>2018-01-15T18:20:14Z</responseDate>
<request identifier=oai:HAL:insu-01406455v1 verb=GetRecord metadataPrefix=oai_dc>http://api.archives-ouvertes.fr/oai/hal/</request>
<GetRecord>
<record>
<header>
<identifier>oai:HAL:insu-01406455v1</identifier>
<datestamp>2018-01-11</datestamp>
<setSpec>type:COMM</setSpec>
<setSpec>subject:sdu</setSpec>
<setSpec>collection:INSU</setSpec>
<setSpec>collection:CNRS</setSpec>
<setSpec>collection:UNIV-AG</setSpec>
<setSpec>collection:UNIV-TLSE3</setSpec>
<setSpec>collection:GR</setSpec>
<setSpec>collection:GM</setSpec>
<setSpec>collection:CDF</setSpec>
<setSpec>collection:UNIV-RENNES1</setSpec>
<setSpec>collection:GR6</setSpec>
<setSpec>collection:OSUR</setSpec>
<setSpec>collection:OMP-LMTG</setSpec>
<setSpec>collection:OMP-GET</setSpec>
<setSpec>collection:AGROPOLIS</setSpec>
<setSpec>collection:OMP</setSpec>
<setSpec>collection:UNIV-AMU</setSpec>
<setSpec>collection:PSL</setSpec>
<setSpec>collection:UR1-HAL</setSpec>
<setSpec>collection:UR1-SDLM</setSpec>
<setSpec>collection:CEREGE</setSpec>
<setSpec>collection:OSU-INSTITUT-PYTHEAS</setSpec>
<setSpec>collection:B3ESTE</setSpec>
<setSpec>collection:UNIV-MONTPELLIER</setSpec>
</header>
<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>WEATHERING AND DENUDATION OFTHE WESTERN CONTINENTAL MARGIN OF PENINSULAR INDIA:THE 40Ar/39Ar DATING OF LATERITIC K-RICH MANGANESE OXIDES</title>
<creator>Bonnet, Nicolas J.</creator>
<creator>BEAUVAIS, Anicet</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Chardon, Dominique</creator>
<creator>Dupont-Nivet, Guillaume</creator>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Environnement Toulouse (GET) ; Institut de Recherche pour le Développement (IRD) - Université Paul Sabatier - Toulouse 3 (UPS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Earth and Environmental Sciences ; University Potsdam</contributor>
<description>International audience</description>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization, Abstracts</source>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization</source>
<coverage>Rennes, France</coverage>
<contributor>Géosciences-Rennes</contributor>
<identifier>insu-01406455</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01406455</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01406455</source>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization, Nov 2016, Rennes, France. Source to Sink: a long term perspective of sediment budgets and sources characterization, Abstracts, pp.42, 2016</source>
<language>en</language>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/conferenceObject</type>
<type>Conference papers</type>
<description lang=en>The Cenozoic weathering of peninsular India has been advocated as a major driver of globalcooling, however, its timing remains virtually unconstrained such that proposed links betweentropical weathering of the Deccan Traps, regional monsoonal intensity and global climate remainsspeculative. To solve this conundrum we present here a revised weathering chronologybased on the identification of lateritic paleosurfaces and their dating using 40Ar/39Ar on supergeneK-rich manganese oxides. We focus on the Indian western passive margin where theWestern Ghats Escarpment (WGE) – a ~1000 m high topographic barrier resulting from thecontinental break up of Greater India – exposes exceptionally preserved weathering profilesfrom the western coastal lowlands to the eastern highland plateaus above the WGE. Four mainlateritic paleosurfaces have been identified: Three in the highland; a high landsurface (Al-Femostly bauxite) at elevation 1200-1000 m asl, an intermediate landsurface covered by a Feduricrustat 1000-900 m asl and a lower pediment landsurface at 850-600 m asl; and one inthe coastal lowland underneath a pediment landsurface at 150-50 m asl. The 40Ar/39Ar agesdocument three major weathering periods over the Cenozoic. The oldest weathering period(W1) is recorded between 53 Ma to 45 Ma both in the highland and the lowland. This correlatesto the Global Eocene climatic Optimum, and allows defining a bauxitic paleolandsurface acrossthe escarpment. Intense bauxitic weathering between ~ 45 and 47 Ma in the lowland indicatethat the WGE was stabilized before ~ 47 Ma on its margin and also implies low denudation rateat the foot of the WGE (<5 m Ma-1) since that time. The second weathering period between37 Ma to 19 Ma (W2) occurred in two distinctive stages (W2a and W2b). From 37 to 26 (W2a),weathering is only recorded in the highland and affect intermediate surfaces. The intensityof chemical weathering decreased sensibly between 32 and 29 Ma – potentially linked to theEarly Oligocene cooling – and resulted in the formation of the lower pediment surface. From~26 Ma to 19 Ma (W2b), only the western coastal lowland weathered while the highland surfacesare mostly dissected. This change and the highland/lowland weathering mitigation after~26 Ma documents a change in climatic patterns over peninsular India that signs the onset ofmodern-like monsoon regime. These results are being interpolated to the Deccan Traps basaltsto quantify their weathering and ultimately estimate of the contribution to CO2 fluxes of thesethree weathering periods and their potential link to Asian Monsoons and global cooling.</description>
<date>2016-11-30</date>
</dc>
</metadata>
</record>
</GetRecord>
</OAI-PMH>
