Tectonic evolution of Dargai ultramafic-mafic complex, Northwest Himalyas, Pakistan. | [Geological Bulletin of the Punjab University • 2002]

Author(s):

1. Muhammad Amjad Awan: Institute of Geology, University of Azad Jammu & Kashmir, Muzaffarabad, Azad Kashmir, Pakistan

2. Mirza Shahid Baig: Institute of Geology, University of Azad Jammu & Kashmir, Muzaffarabad, Azad Kashmir, Pakistan

3. Riaz Ahmed Sheikh: Institute of Geology, University of Punjab, Lahore, Pakistan

4. Akhtar Ali Saleemi: Institute of Geology, University of Punjab, Lahore, Pakistan

Abstract:

In the Himalayan collision zone of northern Pakistan, south of Indus suture zone, the Dargai complex is emplaced on the Paleozoic metamorphic cover sequence of the Indian plate. A schematic structural and tectonic evolution for the emplacement of Dargai complex is proposed here since Cretaceous. The Dargai ultramafic-mafic complex is considered as the klippe or ophiolitic melange of the Indus suture zone. Field observations support the interpretation that the Dargai complex is an alpine ophiolite. These include (a) lack of chilled margin, (b) absence of lamination in tectonite, (c) no intrusive contact, (d) mylonitized and brecciated fault contacts and (e) shows Himalayan metamorphism and deformation. It is a dismembered ophiolite sequence of forearc oceanic crust. It is proposed here that the Dargai klippe is the folded extension of the Main Mantle Thrust (MMT). The trace of the MMT is the Behram Dheri Thrust which has been eroded between Dargai and Indus suture zone due to post-Eocene tectonic uplift and erosion of the Indian plate rocks.

Page(s): 97-104

DOI: DOI not available

Published: Journal: Geological Bulletin of the Punjab University, Volume: 37, Issue: 1, Year: 2002

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