Sedimentological and carbonate data evidence for lake level variations during the past 3700years from a southern Indian lake

作者: Anish Kumar Warrier , R. Shankar , K. Sandeep

DOI: 10.1016/J.PALAEO.2013.05.026

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摘要: Abstract Over the years, several proxies have been developed to reconstruct rainfall variability. However, most rely on indirect approaches provide qualitative paleorainfall estimate. In an attempt obtain a more direct measure of paleorainfall, Shankar et al. (2006) explored rock magnetic properties lake sediments from Thimmannanayakanakere (TK) in tropical southern India. They proposed use susceptibility as proxy for tropics. Warrier and (2009) provided geochemical evidence support this proposition. Here, sedimentological carbonate data is further bolster al.'s High (low) values χlf indicate high region TK during past 3700 years. Particle size variations suggest that sand % was arid (humid) periods, when level low (high). Hence, negative correlation documented between along with other parameters. HIRM (an indicator magnetically “hard” minerals like haematite goethite) suggestive relatively climate; conditions. For reason, positively correlated HIRM. By contrast, fine silt clay contents are low-rainfall periods vice versa. Thus, both parameters, but negatively Magnetic reside principally fraction evidenced positive content susceptibility. Carbonate too indicative conditions, being climatic Based χlf, data, we inferred

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