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Occurrence of the ophiolitic complexes along the Indoburman orogenic belt

Published online by Cambridge University Press:  01 May 2009

R. Duarah ,
M. M. Saikia  and
C. C. Bhattacharjee
R. Duarah
Affiliation:
Regional Research Laboratory (CSIR), Jorhat - 785 006, India
M. M. Saikia
Affiliation:
Regional Research Laboratory (CSIR), Jorhat - 785 006, India
C. C. Bhattacharjee
Affiliation:
Department of Geology, Guwahati University, Guwahati - 781 014, India
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Summary

The ophiolitic complexes within the Indoburman orogenic belt form a conspicuous N-S line along the eastern margins of Manipur and Nagaland. The rock assemblages consisting of mafic-ultramafics are associated with deep sea pelagic sediments of the Disang Group (Lower Cretaceous-Eocene). The ultramafics in part, represent the oceanic crust and upper mantle material that formed the basement on which the radiolarites and other pelagic sediments were deposited. The fossil radiolaria present in the cherts suggest that the orogen took its foundation during late Jurassic-Lower Cretaceous time. The westward obduction of the flysch ophiolites in the form of large thrust sheets was possible during underthrusting of the Indian plate beneath the Burmese. The position of the ophiolitic belt defines the Indoburman suture zone.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 2 , March 1983 , pp. 175 - 182
Copyright
Copyright © Cambridge University Press 1983

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References

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