Abstract
The modified GALO program package for basin modeling is used to calculate the temperature and vitrinite reflectance distributions with depth at any time before, during and after the Deccan Trap formation. We consider five specific profiles crossing the Saurashtra and Kutch regions in North-Western India, central part of the Deccan Plateau and western passive margin of India near the Mumbai offshore. Burial, thermal and maturation histories in selected areas of the region are reconstructed numerically. Duration of trap formation is most critical and indefinite parameter in construction of maturity aureole in the sub-trappean sedimentary complex. Our analysis in the frame of the model of continuous formation of traps suggests that a maturation level of organic matter in sedimentary rocks under the trap depends strongly on duration of the trap formation. Maturity level of organic matter at the distance of 100–200 m below the base of the trap complex can be rather moderate even for traps thickness of 1 km or more, if the trap was formed over fairly a long time.
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