About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 5. (May)

First Page: 727

Last Page: 727

Title: Basins of East India: Tectono-Stratigraphic Facies: ABSTRACT

Author(s): S. N. Murty Inkollu, Martha O. Withjack, J. J Gallagher

Article Type: Meeting abstract

Abstract:

Rocks and structures of east India result from both global and local processes. Global sea level and the breakup of Gondwanaland control the broad aspects of sedimentation and deformation, and local sedimentologic and tectonic variables determine specific lithologic and structural variations. The concept of tectono-stratigraphic facies is convenient in the interpretation of different suites of rocks and structures which are related ultimately to the same global processes. Three tectono-stratigraphic facies are recognized for east India. Facies 1 is on the craton. It consists of very long, narrow grabens or half grabens containing small normal faults. Most faults are Early Triassic to Early Cretaceous in age but some may be older. Sediments are restricted to the grabens an are late Carboniferous through Early Cretaceous fluviatile or lacustrine clastics. Facies 2 is in broad basins along the continental margin. Major Late Jurassic to Early Cretaceous normal faults divide the basins into a series of elongate blocks. Sediments are predominantly Late Jurassic through Early Cretaceous marine, paralic and continental clastics. Facies 3 is found along the continental margin. Faults are Late Cretaceous to early Tertiary in age, while sediments are marine, paralic, and continental deposits of Late Cretaceous to recent age. Marine sediments are more dominant offshore.

The ten most prominent basins of east India can be classified in terms of tectono-stratigraphic facies. The Godavari, Mahanadi, Damodar, and Satpura basins are dominated by facies 1, and the Cauvery, Palar, Godavari-Krishna, and Mahanadi-Brahmani basins are characterized by facies 2 and 3. The Bengal basin is dominated by facies 3. Observed dominant facies may grade into one of the other facies in unexplored parts of these basins or at depths yet to be probed.

End_of_Article - Last_Page 727------------

Copyright 1997 American Association of Petroleum Geologists