Abstract

Four models have been proposed so far to explain the tectonic evolution of the Indus Suture. These are based on:

1. Isotatically controlled crustal deformation of the Indian and Tibetan Cratons;

2. An Alpine-type deformation of an engeosyncline and associated components in between the two cratons;

3. Plate tectonically controlled subduction of the Indian Craton under the Tibetan Craton;

4. Collision of the Indian and Tibetan “Crustal Slabs” due to an overall expansion of the earth and creation of new oceans.

An up-to-date inventory of the existing data on the structure, stratigraphy and depositional facies of the relevant sediments is taken. It is obvious that there are serious gaps in data points in respect of all four models, making an unique choice of the applicable model extremely difficult.

Attention is focussed on the nature of data needed from the critical areas for sorting out the viable model. Needless to say, an intelligent appraisal of the petroleum potential of the adjoining regions is contingent on the choice of the correct model of tectonic evolution of the Mediterranean-type Tethyan basins associated with the Indus Suture.