Late-Quaternary variations in clay minerals along the SW continental margin of India: evidence of climatic variations |
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| Authors: | O S Chauhan B S Sukhija A R Gujar P Nagabhushanam A L Paropkari |
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| Institution: | (1) National Institute of Oceanography, Dona Paula, 403 004 Goa, India e-mail: onkar@csnio.ren.nic.in, IN;(2) National Geophysical Research Institute, Uppal Road, 500 007 Hyderabad, India, IN |
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| Abstract: | Down-core variations in illite, chlorite, smectite and kaolinite (the major clays) in two 14C-dated cores collected along the SW continental margin of India show that illite and chlorite have enhanced abundance during
20–17, 12.5, 11–9.5, and 5–4.8 ka b.p., whereas smectite accumulation is higher between 17 and 12.5, and after 9 ka b.p. The climate may have been predominantly arid at 17 (20–17), 12.5, 10.5 (11–9.5), and 4.8 ka b.p. The first three dates correspond to the last glacial maximum, Bolling-Allerod, and Younger Dryas events, respectively. The
SW monsoon was variable between 17 and 15 ka b.p., and it was more stable and intense after the Younger Dryas until about 6 ka b.p.
Received: 2 December 1999 / Revision accepted: 11 April 2000 |
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