Sr isotopic evidence on the spilitic degradation of the Deccan basalt |
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| Authors: | K V Subbarao |
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| Institution: | (1) Department of Earth Sciences, Indian Institute of Technology, 400 076 Mumbai (Bombay), India |
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| Abstract: | Similar Sr isotopic ratios (∼ 0.7055) for the tholeiite-spilite flow unit and the associated mineral phases, of Bombay (Deccan
Traps) provide a direct evidence for the spilitic degradation of tholeiite. In contrast, a dramatic increase in the rare earth
elements (REE) from basalt to spilite is rather puzzling as rare earths are considered to be relatively immobile. The geochemistry
thus suggests that the process of spilitization is due to the reaction with a complex fluid having identical Sr-isotopic composition
as that of the basaltic magma—thereby masking the details of the mixing process. |
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| Keywords: | Spilites Deccan basalt Sr isotopes |
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