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Geological Society, London, Special Publications; 2000; v. 170; p. 77-100;
DOI: 10.1144/GSL.SP.2000.170.01.05
© 2000 Geological Society of London

Tectonics of the SW margin of the Nanga Parbat-Haramosh massif

M. A. Edwards1,2,5, W. S. F. Kidd1, M. A. Khan3 & D. A. Schneider4

1 Department of Earth & Atmospheric Sciences, State University of New York at Albany, 1400 Washington Avenue, Albany, NY 12222, USA
2 Institut für Geologie, Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany
3 National Centre for Excellence in Geology, University of Peshawar, Peshawar, Pakistan
4 Department of Earth and Environmental Sciences, Lehigh University, 31 Williams Drive, Bethlehem, PA 18015, USA
5 Asian Tectonics Research Unit, Institut für Geologie, TU-Bergakademie Freiburg, Bernhard v-Cotta Strasse 2, D-09596 Freiburg, Germany edwards{at}geo.tu.freiburg.de

We present an analysis of the tectonic evolution of the southwestern portions of the Nanga Parbat massif, Pakistan Himalaya, based upon detailed mapping and structural analyses from the Bunar, Biji, Diamir, Airl, Niat and SW Rupal valleys. Mainly metasedimentary cover rocks of the Indian plate are divided into upper and lower cover. There is a marked structural thinning of the cover in the main Bunar valley from south to north, and this is attributed to a major frontal ramp in the original Main Mantle Thrust (MMT). A hitherto unmapped shear zone, the Diamir Shear Zone, is identified, that is associated with a syn-kinematically intruded belt of granitic rocks, the Jalhari Granite. The shear zone is a several kilometre thick, generally W-vergent, ductile to brittle shear zone that is associated with local overturning of the entire MMT section, typified by the Gashit Fold. 40Ar/39Ar cooling ages from across the area indicate a steep cooling age gradient across the Diamir Shear Zone from >40 to <5 Ma. The Diamir Shear Zone is mechanically linked to part of the Raikhot Fault System and, together, they are seen to be a crustal-scale reverse fault that has allowed relative uplift and overthrusting of the core of Nanga Parbat.





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R. R. Jones, R. E. Holdsworth, M. Hand, and B. Goscombe
Ductile extrusion in continental collision zones: ambiguities in the definition of channel flow and its identification in ancient orogens
Geological Society, London, Special Publications, 2006; 268: 201 - 219.
[Abstract] [PDF]