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Geological Society, London, Special Publications; 1993; v. 74; p. 161-172;
DOI: 10.1144/GSL.SP.1993.074.01.12
© 1993 Geological Society of London

North and West Pakistan

High-pressure metamorphism in the High Himalayan Crystallines of the Stak valley, northeastern Nanga Parbat-Haramosh syntaxis, Pakistan Himalaya

Ugo Pognante1,*, Piera Benna1 & Patrick Le Fort2

1 Dipartimento di Scienze Mineralogiche e Petrologiche and C. S. Geodinamica Catene Collisionali (CNR), Via Valperga Caluso, 37, 10125 Torino, Italy
2 Laboratoire de Géodynamique des Chaînes Alpines, Institut Dolomieu, 15 rue Maurice Gignoux, 38031 Grenoble, France

The High Himalayan Crystallines (HHC) from the little-known NE termination of the Nanga Parbat-Haramosh syntaxis (Stak and upper Turmik valleys, Pakistan) consist of kyanite-bearing gneiss with minor garnet-granulite and garnet-amphibolite. The HHC underwent a Himalayan metamorphism with a peak at high pressure (8–13 kbar) and high temperature (650–700° C). During exhumation the HHC rocks followed a rapid exhumation path at high temperature with little or no medium to low pressure re-equilibration. These lines of evidence, combined with geochronological and petrological data from Eocene eclogites recently found in the Kaghan nappe, indicate that, after subduction and high to very high pressure metamorphism, part of the HHC from northern Pakistan underwent very rapid cooling and exhumation. By contrast, exhumation along paths of increasing temperature are recorded by the HHC from regions located east of Pakistan (e.g. Nepal). These differences along strike in the HHC suggest that, during the Eocene collision between India and Eurasia, subduction and exhumation occurred at higher rates in northwestern than in central-eastern Himalaya.


* Following the untimely death of Ugo Pognante in a skiing accident this paper has been revised by his co-authors with the assistance of Bruno Lombardo.




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