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Reference: Walker, Christian Bryan., (1999). The tectonothermal evolution of the high himalayas in the Suru valley, NW Zanskar, with constraints from metamorphic modelling. Dphil. University of Oxford.Citable link to this page:

 

The tectonothermal evolution of the high himalayas in the Suru valley, NW Zanskar, with constraints from metamorphic modelling

Abstract: This thesis attempts to construct an integrated model for the tectonothermal evolutionof the Suru valley region of the High Himalayan Crystalline unit of north-west India, andcombines detailed field mapping, petrographic and microstructural analysis, thermobarometrictechniques and metamorphic modelling.This work confirms that the metasedimentary lithologies of the Suru valley correspondto the Palaeozoic-Mesozoic Tethyan shelf sediments found in Kashmir and Zanskar and thatthe meta-igneous bodies correlate with Permian rift-related igneous units. This demonstratesthat all the metamorphism in the Suru valley is Himalayan in age. Subsequent to India-Asiacollision at ~54 Ma the units of the Suru valley underwent a polyphase deformational andmetamorphic history. The large scale structure of the area is that of kilometre-scale, SWvergentrecumbent folds that are domed by a later structure, the Suru Dome. Barrovianmetamorphism resulting from collision and burial reached a maximum of kyanite grade, and isbelieved to be syn- to post-kinematic with respect to the formation of the large folds.Thermobarometric analysis indicates that peak conditions relating to this Barrovian eventwere of the order of 9.5-10.5 kbar and 620-650 0C. A later metamorphic event associated withdoming throughout the Zanskar Himalaya and crustal anatexis in the core of the HighHimalaya caused re-equilibration of deeper Suru Dome rocks to conditions of 8.7-9.7 kbarand 630-640 0C.Metamorphic modelling, involving phase diagram construction and P-T pathdetermination using Gibbs method calculations, suggests that metamorphic garnets grewunder conditions of burial and heating. Rapid exhumation of the High Himalayan Crystallineson the Main Central Thrust and the Zanskar Shear Zone occurred shortly after peakmetamorphism. The results suggest that phase diagram construction and P-T path calculationshould be used in conjunction in order to confidently model metamorphic rocks.

Type of Award:Dphil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:The digital copy of this thesis has been made available thanks to the generosity of Dr Leonard Polonsky

Bibliographic Details

Issue Date: 1999Identifiers

Urn: uuid:bac5b462-854e-4741-a787-ef3fe23647d0

Source identifier: 602800819 Item Description

Type: Thesis;

Language: eng Subjects: Geodynamics Geology, Structural Research Tiny URL: td:602800819

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Author: Walker, Christian Bryan. - institutionUniversity of Oxford facultyFaculty of Physical Sciences - - - - Bibliographic Details Issu

Source: https://ora.ox.ac.uk/objects/uuid:bac5b462-854e-4741-a787-ef3fe23647d0



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