Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

A. K. Biyani ¹

Affiliations
1 D.B.S. (PG) College, Dehru Dun - 248 001, IN

Abstract

The distinctive feature of the Higher Himalaya of Yamuna Valley is that with in the hanging wall greenschist metapellitic nappe, quartzite and marble of footwall are exposed both with inverted disposition of isograds in the eyelid windows. These Barrovian type syn- to post-tectonic events of metamorphism are recorded in the rocks. Chlorite to garnet zone paragenesis in metapelitic rocks and chlorite-biotite zone paragenesis in quartzite and marble are developed by stronger earlier event of metamorphism (M1). The second event of metamorphism (M2) is mild, followed by another feeble retrogressive event (M3). While inversion of isograds in metapelites is attributed to hot slab thrust over the cold, in quartzite and marble, evidences suggest additional role of shear heating and contact effect by a sub-surface cooling igneous body.

Keywords

Metamorphism, Higher Himalaya, Yamuna Valley, Uttar Pradesh.

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A. K. Biyani ¹

Affiliations
1 Department of Geology DBS (PG) College Dehra Dun - 248 001 Uttaranchal, IN

Abstract

No Abstract.

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A. K. Biyani ¹

Affiliations
1 D.B.S. (P.G.) College, Dehradun. U.P., IN

Abstract

Sisakhan base metal deposit is likely to be a workable mineral deposit in rather poorly mineralised Himalaya. The mineralised quartz vein contains mainly galena and small quantity of chalcopyrite and sphalerite. The mineralised vein is structurally controlled at the contact of chlorite schist and biotite schist and probably emplaced in the later part of Neogene as no evidence of deformation is found in the vein. The preliminary investigation suggests that the mineralisation took place in relatively dry and low temperature condition.

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A. K. Biyani ¹, M. N. Joshi ¹

Affiliations
1 Dept. of Geology, D.B.S. College, Dehra Dun - 248 001, Uttaranchal, IN

Abstract

No Abstract.

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