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Authors
Affiliations
1 Department of Geology, AMU, Aligarh - 20202, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 459-467
Abstract
Sandstones of sub-flysch Oligocene Barail Group and molasse Miocene Surma Group of the Surma-Barak basin (Manipur, India), developed with uplift of the Himalaya and the Indo-Burma range, are fine to medium grained and have high quartz and lithic contents relative to feldspar. Barail Group of sandstone is moderately mature both in terms of texture and composition, whereas Surma Group of sandstone is immature texturally and compositionally. Barail and Surma sandstones are sublitharenite and litharenite. The provenance of sandstone of the Barail Group is "quartzose recycled orogen" and "cratonic interior", whereas that of the Surma Group is "quartzose recycled orogen" and "transitional recycled orogen". The detritus of sandstone are mostly derived from collision-suture fold belt. Diverse lithic fragments of shale, siltstone, slate, chert, phyllite, quartzite and quartz-mica schist with few plutonic and volcanic igneous rocks suggest their derivation from a complex assemblage of sedimentary, metasedimentary and low-medium grade metamorphic source with minor plutonic and volcanic rock contribution. Petrographic studies also suggest the prevalence of humid and semi-humid climate for Barail and Surma sandstone. Modal plots on the QpLvrnLms and LmLvLs diagram indicate that the Barail and the Surma sandstones were derived from the Collision suture and Fold Thrust belt source. Tectonic activity is the dominant factor controlling the nature and composition of the sandstone of this Surma-Barak basin.
Keywords
Surma-Barak Basin, Indo-Burma, Provenance Evolution, Petrographic Analysis, Barail and Surma Sandstone.
