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Journal of the Geological Society; 1993; v. 150; issue.5; p. 843-856;
DOI: 10.1144/gsjgs.150.5.0843
© 1993 Geological Society of London

Papers

Contrasting metamorphic P–T–time paths of the Kohistan granulites and tectonics of the western Himalayas

HIROSHI YAMAMOTO

Geological Institute, Faculty of Science, University of Tokyo, Hongo 7-3-1, Tokyo 113, Japan

In the Swat-Indus Kohistan area, lower crustal rocks of the Kohistan arc including amphibolites, granulites and ultramafic rocks are widely exposed. Detailed petrological-structural studies reveal that the Chilas-Jijal metamorphic complex comprises essentially intermediate- to high-pressure granulites with a granulite/amphibolite transition controlled by extensive retrograde metamorphism and ductile deformation. Contrasting patterns of compositional zoning in garnet and orthopyroxene suggest complicated P–T paths in the granulites. Geothermobarometry based on garnet-bearing granulites identify two distinct P–T–time paths: a high-pressure anticlockwise path of the Jijal complex and a low-pressure retrograde path of the Chilas complex. These P–T–time paths represent the evolution of middle to lower crustal rocks of the Kohistan arc. The anticlockwise P–T-time path combined with published isotopic ages reveals that: (i) the high pressure granulitefacies metamorphism is related to the Kohistan-Asia collision and (ii) the crust of the Kohistan arc had been thickened at least 55 km before the India-Asia collision.




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