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<publisher>HAL CCSD</publisher>
<title lang=en>Cenozoic lateritic weathering and erosion history of Peninsular India from 40 Ar/ 39 Ar dating of supergene K-Mn oxides</title>
<creator>Bonnet, Nicolas</creator>
<creator>BEAUVAIS, Anicet</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Chardon, Dominique</creator>
<creator>Jayananda, Mudlappa, </creator>
<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>Institut de Recherche pour le Développement (IRD)</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>Bangalore University</contributor>
<contributor>Cefipra project 5007-1, IRD, INSU</contributor>
<description>International audience</description>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>ird-01419899</identifier>
<identifier>http://hal.ird.fr/ird-01419899</identifier>
<identifier>http://hal.ird.fr/ird-01419899/document</identifier>
<identifier>http://hal.ird.fr/ird-01419899/file/CHEMGE9048R2.va.pdf</identifier>
<source>http://hal.ird.fr/ird-01419899</source>
<source>Chemical Geology, Elsevier, 2016, Deciphering time-dependent processes in soil and weathering profile evolution, 446, pp.33-53. 〈10.1016/j.chemgeo.2016.04.018〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2016.04.018</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2016.04.018</relation>
<language>en</language>
<subject lang=en> Cenozoic</subject>
<subject lang=en> Lateritic weathering</subject>
<subject lang=en> Mn-ore deposits</subject>
<subject lang=en> Supergene Mn-oxides</subject>
<subject lang=en>40Ar-39Ar geochronology</subject>
<subject lang=en> India</subject>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Since Deccan Traps extrusion ~ 65 Ma ago, thick weathering mantles have developed over Peninsular India on both the western coastal lowland and adjacent plateau separated by the Western Ghats Escarpment. Manganiferous lateritic profiles formed by supergene weathering of Late Archean manganiferous protores are exposed on paleolandsurface remnants on both sides of the escarpment. Petrological and geochemical characterizations of samples from those Mn lateritic profiles allowed identifying cryptomelane (K-Mn oxide) dated by 40Ar/39Ar geochronology. The ages obtained document major weathering periods, ca. 53-50 Ma, and ca. 37-23 Ma in the highland, and ca. 47-45 Ma, ca. 24-19 Ma and discrete weathering pulses at ~ 9 Ma and ~ 2.5 Ma in the lowland. Old ages of the highland (53-50 Ma) and the lowland (47-45 Ma) indicate synchronous lateritic weathering across the escarpment at a time the peninsula started to drift across the equatorial belt. Intense weathering periods at ca. 53-45 and ca. 37-23 Ma are interpreted to reflect the Early Eocene climatic optimum and the onset of Asian monsoon regimes, respectively. The ages further indicate that most of the dissection of the highland must have taken place after ~ 23 Ma, whereas the lowland was weakly incised essentially after ~ 19 Ma. Our results also document divergent erosion and weathering histories of the lowland and the highland after the Eocene, suggesting installation of a dual climatic regime across the Western Ghats escarpment.</description>
<date>2016-12-23</date>
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