NDLI: Biostratigraphy and palaeoenvironmental analysis of subsurface Palaeogene sediments in western part of Ahmedabad Block, North Cambay Basin

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Biostratigraphy and palaeoenvironmental analysis of subsurface Palaeogene sediments in western part of Ahmedabad Block, North Cambay Basin

Content Provider	Birbal Sahni Institute of Paleobotany
Author	Shanmukhappa, M. Uniyal, S.N.
Abstract	The western part of Ahmedabad Block is among the thrust areas for hydrocarbon exploration in Cambay Basin. Palynological studies of the Palaeogene sediments of Ahmedabad Block between Detroj and Wasnalava have been carried out to evaluate the palynostratigraphy and infer depositional environment to help in basin modelling for exploration of hydrocarbons. Based on palynofloral association three assemblage zones, viz. Polybrevicolporites cephalus Zone(Palynozone-I), Proxapertites cursus- Polycolpites flavatus Zone (Palynozone-II) and Palmaepollenites kutchensis Zone(Palynozone-III) have been identified. These zones are dated Early, Middle and Late Eocene in age. The sediments corresponding to Olpad Formation (?Palaeocene) exhibited poor palynofloral contents. The interpretation of depositional environment is based on the absolute pollen frequency and palynofloralassociations. In Cambay and Kadi formations the coastal and back mangrove elements are common with sporadic occurrence of marine elements, suggestive of near shore environment of deposition. The overlying Kalol Formation has yielded rich back mangrove floral assemblage along with moderate occurrences of coastal elements and is suggestive of Littoral conditions. The dominance of marine phytoplankton in Tarapur Formation is indicative of shallow marineconditions of deposition.
Starting Page	465
Ending Page	477
File Format	PDF
Volume Number	57
Language	English
Publisher Date	2008-01-01
Access Restriction	Open
Subject Keyword	Biostratigraphy Palaeoenvironmental Palaeogene Ahmedabad North Cambay Basin
Content Type	Text
Educational Use	Research Reading
Resource Type	Article
Education Level	Under Graduate Post Graduate
Subject	Paleobotany; fossil microorganisms

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