230Th/234U and 14C dating of the Quaternary carbonate deposits of Saurashtra, India

Baskaran, M. ; Rajagopalan, G. ; Somayajulu, B. L. K. (1989) 230Th/234U and 14C dating of the Quaternary carbonate deposits of Saurashtra, India Chemical Geology: Isotope Geoscience section, 79 (1). pp. 65-82. ISSN 0168-9622

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Related URL: http://dx.doi.org/10.1016/0168-9622(89)90007-9

Abstract

Seventy-eight samples from Quaternary carbonate deposits of the Saurashtra peninsula in Gujarat State, India, were dated by three variants of the 230Th/234U technique: (I) using a 5% acetic acid leaching method and applying a correction for detrital Th; (II) using 1 M HC1 leaching with corrections for detrital U and Th; and (III) the isochron method. Twenty-one samples were also used for 14C age determination. About forty reliable 230Th/234U ages were obtained ranging from 45.9 to 204 ka. Of the 21 samples used for 14C dating, twelve yielded ages > 30 ka whereas the rest ranged from 12.1 to 21.5 ka. Based on the 230Th/234U ages it is inferred that miliolite formation took place mainly in three episodes: 50-70, 75-115 and 140-210 ka. Considering the available evidence in favour of tectonic instability of Saurashtra, uplift rates of the miliolite locations are calculated to range from 0.23 to 2.2 mm a−1, which are in good agreement with rates obtained for other regions based on similar studies.

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