The Open UniversitySkip to content
 

First evidence for Himalayan-age synconvergent extension recognized within the western syntaxis - Nanga Parbat, Pakistan

Argles, T.W. and Edwards, M.A. (2002). First evidence for Himalayan-age synconvergent extension recognized within the western syntaxis - Nanga Parbat, Pakistan. Journal of Structural Geology, 24(8) pp. 1327–1344.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/S0191-8141(01)00136-5
Google Scholar: Look up in Google Scholar

Abstract

We present evidence for horizons of medium to high grade (400–600°C) deformation accompanying normal sense displacement in high-strain Himalayan gneisses and schists from the southeastern Nanga Parbat massif, the western syntaxis in the Pakistan Himalaya. In their present orientation, the broadly N–S trending, steeply-dipping gneisses show microstructural and outcrop scale evidence for dextral and sinistral shear in discrete layers. We interpret these as horizons of thrust and normal motion within the footwall of the original Main Mantle Thrust, once Neogene antiformal folding is removed. This is the first report of significant normal motion in the Main Mantle Thrust footwall in the Nanga Parbat syntaxis and may indicate that synconvergent extension in the Himalaya extended to the western syntaxis. This episode of extension could correspond to a period of similar normal motion in the central Himalaya, or represent a separate event earlier in the orogeny.

Item Type: Journal Article
ISSN: 0191-8141
Keywords: Nanga Parbat syntaxis; Ductile extension; Himalayas; Main Mantle Thrust; Shear sense
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4321
Depositing User: Thomas Argles
Date Deposited: 05 Jul 2006
Last Modified: 24 Nov 2014 11:26
URI: http://oro.open.ac.uk/id/eprint/4321
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk