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Evolution of paleoclimatic conditions and vegetation change in Himalaya from compound specific hydrogen and carbon analyses
Palhol, F.; Galy, V.; France-Lanord, C. et al.
2006In Geochimica et Cosmochimica Acta, 70 (18), p. 468-A468
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Abstract :
[en] Supplied by the Ganga–Brahmaputra fluvial system, the Bengal Fan provides an integrated record of the Himalayan basin history through time. The active channel-levee system of the middle fan documents the last glacial/interglacial cycle. Organic geochemistry studies have shown that the organic matter contained in the Bengal Fan sediments is mainly of terrestrial origin. We analysed terrestrial n-alkanes (C27–C33) from Bengal Fan sediments and modern Ganga–Brahmaputra sediments. Comparison of compound specific hydrogen and carbon isotopic ratios in these samples allow us to follow the evolution of paleoenvironmental conditions since the Last Glacial Maximum. Carbon molecular isotopic data on the odd-HMW n-alkanes show a shift of 4&, corresponding to an evolution in the Himalayan system from a C4-dominated vegetation at LGM to a C3- dominated vegetation during the Holocene. It is now well known that C4 plants are more adapted than C3 plants to low atmospheric CO2 concentrations and to relatively hot and dry climate. In the same time, molecular D/H isotopic ratios measured on the same samples show an increase of the deuterium content of about 20& during the Holocene, which is consistent with lower temperature at the end of the LGM in the Himalaya. As low temperature should favored C3 plants, the predominance of a C4 vegetation have to be linked with dryer conditions at the end of the LGM. Afterwards, the increase of the C3/C4 ratio in the Himalayan system is related to a concomitant increase of humidity and pCO2 during the Holocene.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Palhol, F.
Galy, V.
France-Lanord, C.
Faure, P.
François, Louis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques
Language :
English
Title :
Evolution of paleoclimatic conditions and vegetation change in Himalaya from compound specific hydrogen and carbon analyses
Publication date :
2006
Event name :
16th Annual V.M. Goldschmidt Conference 2006
Event organizer :
The Geochimical Society
Event place :
Melbourne, Australia
Event date :
27 August - 1 September 2006
Audience :
International
Journal title :
Geochimica et Cosmochimica Acta
ISSN :
0016-7037
eISSN :
1872-9533
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Volume :
70
Issue :
18
Pages :
A468-A468
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 March 2013

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