Physical properties of Indus ophiolites from Kashmir Himalaya

Details Physical properties of Indus ophiolites from Kashmir Himalaya Physical properties of Indus ophiolites from Kashmir Himalaya

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...43..104r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 43, Issue 2, p. 104-122.

Physics

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Scientific paper

The Indus suture rocks from the Dras-Sanko-Kargil regions have been studied for their petrography, chemical and physical properties. Seismic velocities as a function of pressure up to 10 kbar are obtained on different rock types of the ophiolite assemblage, such as spilite, metabasalt, schist, dunite, peridotite, pyroxenite, serpentinite, metagreywacke and associated granodiorite. Empirical relations of density versus velocity, density versus porosity, the results of anisotropy due to multidirectional measurements of velocity, data of static strength and dynamic moduli, and regression analysis of stress-strain data, are presented.
They exhibited low anisotropy and high strength, the exceptions being those that are serpentinized. The metamorphism of the regional rocks, the consequent hydrothermal alteration, the degree of serpentinization in the ultramafics, and the groundmass to phenocryst ratio amongst the metabasics, are found to influence the physical properties. Thermal studies yielded the results of the increase in expansion, of the decrease in density and the dependence of α on the porphyritic mineral content. The absence of a definite sequential association, as well as a lack of metamorphic contact in the area between the ultramafics and metavolcanics, and the differing compatible nature in the pressure-velocity modelling results (the ultramafics, gabbros, dykes being compatible with the oceanic rocks and ophiolites; while the metavolcanics are incompatible), suggest the dismembered nature of the Indus ophiolites.
Now with the National Institute of Oceanography, Waltair Centre, Waltair (A.P.), India.

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