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Ages of Alpine tectonometamorphic events in the northwestern Himalaya (northern Pakistan) by 39 Ar/ 40 Ar method
Author(s) -
Maluski Henri,
Matte Philippe
Publication year - 1984
Publication title -
tectonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.465
H-Index - 134
eISSN - 1944-9194
pISSN - 0278-7407
DOI - 10.1029/tc003i001p00001
Subject(s) - metamorphism , geology , blueschist , fibrous joint , subduction , obduction , geochemistry , crust , tectonics , seismology , geomorphology , oceanic crust , eclogite , medicine , anatomy
The main tectonometamorphic alpine events which occurred in the western part of the western Himalayan virgation at south of the main suture, in northern Pakistan, are dated by the 39 Ar/ 40 Ar method. These events are as follows: (1) the blueschist metamorphism (80 ± 5 Ma) present in tectonic/ophiolititic melanges along the suture (this event occurred during an early subduction or obduction stage) (2) the alpine barrovian metamorphism (50–30 Ma) developed in the sedimentary cover and orthogneisses of the Indian Plate during the postcollisional northward underthrusting of this plate below Asia, and (3) the emplacement of postmetamorphic leucogranites (23 Ma) resulting from the melting of the Indian crust during the climax of the alpine metamorphism.