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Hydrography of the eastern Arabian Sea during summer monsoon 2002

Shankar, D and Shenoi, SSC and Nayak, RK and Vinayachandran, PN and Nampoothiri, G and Almeida, AM and Michael, GS and Ramesh Kumar, MR and Sundar, D and Sreejith, OP (2005) Hydrography of the eastern Arabian Sea during summer monsoon 2002. In: Journal of Earth System Science, 114 (5). pp. 459-474.

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Abstract

Many physico-chemical variables like rock-type,climate,topography and exposure age a ffect weathering environments.In the present study,an attempt is made to understand how the nature of clay minerals formed due to weathering differs in tropical regions receiving high and low rainfall. Clay mineralogy of weathering pro files in west coast of India,which receives about 3 m rainfall through two monsoons and those from the inland rain-shadow zones (<200 cm rainfall)are studied using X-ray di ffraction technique.In the west coast,1:1 clays (kaolinite)and Fe –Al oxides (gibb-site/goethite)are dominant clay minerals in the weathering pro files while 2:1 clay minerals are absent or found only in trace amounts.Weathering pro files in the rain shadow region have more complex clay mineralogy and are dominated by 2:1 clays and kaolinite.Fe –Al oxides are either less or absent in clay fraction.The kaolinite –smectite interstrati fied mineral in Banasandra pro files are formed due to transformation of smectites to kaolinite,which is indicative of a humid paleo-climate.In tropical regions receiving high rainfall the clay mineral assemblage remains the same irrespective of the parent rock type.Rainfall and availability of water apart from temperature, are the most important factors that determine kinetics of chemical weathering.Mineral alteration reactions proceed through di fferent pathways in water rich and water poor environments.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: physico-chemical variables;monsoons;hydrography
Department/Centre: Others
Date Deposited: 17 Oct 2007
Last Modified: 09 Jan 2012 07:00
URI: http://eprints.iisc.ernet.in/id/eprint/10599

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