Deformation, metamorphism and imbrication of the Indian plate, south of the Main Mantle Thrust, north Pakistan
作者:
P. J. TRELOAR,
R. D. BROUGHTON,
M. P. WILLIAMS,
M. P. COWARD,
B. F. WINDLEY,
期刊:
Journal of Metamorphic Geology
(WILEY Available online 1989)
卷期:
Volume 7,
issue 1
页码: 111-125
ISSN:0263-4929
年代: 1989
DOI:10.1111/j.1525-1314.1989.tb00578.x
出版商: Blackwell Publishing Ltd
关键词: Barrovian metamorphism;deformation chronology;Hazara region;north Pakistan;Main Mantle Thrust;tectonic inversion
数据来源: WILEY
摘要:
ABSTRACTSouth of the Main Mantle Thrust in north Pakistan, rocks of the northern edge of the Indian plate were deformed and metamorphosed during the main southward thrusting phase of the Himalayan orogeny. In the Hazara region, between the Indus and Kaghan Valleys, metamorphic grade increases northwards from chlorite zone to sillimanite zone rocks in a typically Barrovian sequence. Metamorphism was largely synchronous with early phases of the deformation. The metamorphic rocks were subsequently imbricated by late north‐dipping thrusts, each with higher grade rocks in the hanging wall than in the footwall, such that the metamorphic profile shows an overall tectonic inversion. The rocks of the Hazara region form one of a number of internally imbricated metamorphic blocks stacked, after the metamorphic peak, on top of each other during the late thrusting. This imbrication and stacking represents an early period of post‐Himalayan upl
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