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Paleoenvironmental significance of clay mineral assemblages in the southeastern Arabian Sea during last 30 kyr

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A gravity core SK-221 recovered from the southeastern Arabian Sea near Laccadive–Chagos Ridge was examined to identify the sources of detrital clay minerals and to decipher paleoenvironmental changes for the last 30 kyr. The clay mineral assemblages predominantly consist of illite, kaolinite and chlorite with small amounts of smectite. Quartz, feldspar and occasionally gibbsite are the clay-sized non-clay minerals present in the examined section. The detrital clay minerals primarily originated from the hinterland and were supplied to the present site by the numerous small rivers draining western India during preglacial and Holocene periods, and partly by the strong reworking of Indian continental shelf during glacial period. The low values of humidity proxies (kaolinite content, kaolinite to illite and smectite to illite ratios) and better illite crystallinity indicate relatively weak summer monsoon condition that resulted in reduced chemical weathering during glacial period, which was interrupted by a discrete event of winter monsoon intensification at ~20–17 ka. The increased kaolinite content, higher values of humidity indices and poorer illite crystallinity reflect high humidity that resulted in strong hydrolysis activity during the preglacial and Holocene periods. The increased CaCO3 during above periods also indicates less terrigenous dilution and intensified southwest monsoon-led upwelling which result in higher surface biogenic productivity. The characteristic clay mineral associations broadly suggest dry to semi-drier conditions during Heinrich Events H1, H2, and H3 and also during Younger Dryas. The low values of biogenic carbonate and organic carbon also indicate low productivity associated with weak summer monsoons during Heinrich Events. Abrupt increased humidity was recorded at 15–12.7 ka (Bølling/Allerød Event) sandwiched between two lows of Heinrich Events. Cycles of millennial timescale variations 2300, 1800, 1300 and 1000 yr have been observed from the clay mineralogical data. All the cycles observed in the monsoonal climate appear to be part of global oscillations.

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Acknowledgements

The authors are thankful to Director, NCAOR, Goa who has allowed Sujit Sarkar and Prashant Mishra, students of Earth and Planetary Sciences, University of Allahabad, Allahabad to participate in the Sagar Kanya cruise and collect samples for the present study. They thank Mr. Ashish Kesari, University of Allahabad for analysing the samples using XRD and to Dinesh K Ray, Institute of Physics for preparing the samples for AMS analysis. The thoughtful comments of anonymous reviewers helped to improve the quality of the manuscript.

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  1. Department of Earth & Planetary Sciences, University of Allahabad, Allahabad, 211 002, India

    SIDDHARTHA SANKAR DAS, AJAI K RAI, VASEEM AKARAM & DHANANJAI VERMA

  2. Department of Ocean & Atmospheric Studies, University of Allahabad, Allahabad, 211 002, India

    A C PANDEY

  3. Institute of Physics, Bhubaneswar, 751 005, India

    KOUSHIK DUTTA & G V RAVI PRASAD

  4. University of Minnesota, Duluth, MN, 55812, USA

    KOUSHIK DUTTA

  5. University of Georgia, Athens, GA, 30602, USA

    G V RAVI PRASAD

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DAS, S.S., RAI, A.K., AKARAM, V. et al. Paleoenvironmental significance of clay mineral assemblages in the southeastern Arabian Sea during last 30 kyr. J Earth Syst Sci 122, 173–185 (2013). https://doi.org/10.1007/s12040-012-0251-1

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