TY  - JOUR
A1  - Wilke, Franziska Daniela Helena
A1  - Schmidt, Alexander
A1  - Ziemann, Martin Andreas
T1  - Subduction, peak and multi-stage exhumation metamorphism: Traces from one coesite-bearing eclogite, Tso Moran, western Himalaya
JF  - Lithos : an international journal of mineralogy, petrology, and geochemistry
N2  - Ultrahigh-pressure (UHP), coesite-bearing edogites in the Himalaya have been documented from the Kaghan Valley in Pakistan and the Tso Morani area in northwest India. These complexes are part of the northern edge of the Indian plate that has been subducted to, and metamorphosed at, mantle depths of more than 100 km before being exhumed. Both UHP complexes are located today directly adjacent to the Indus-Tsangpo suture zone and are not separated by non-metamorphosed sequences of Tethyan sediments from the Asian margin. Herein, we present new data for one fresh coesite-bearing eclogite from the Tso Moran massif. Therein, garnets are zoned reflecting their growth during prograde and peak metamorphism and showing a thin retrograde overgrowth. Inclusions can be directly correlated to the compositional zoning and are seen as either relicts of the protolith mineral paragenesis and as "snap shots" of the mineral paragenesis during subduction and under peak conditions. Rare earth element concentrations (REE) were obtained for garnet, mineral inclusions in garnet and matrix minerals. The REE pattern in garnet reflects a sequential change in matrix minerals and their proportions due to net transfer reactions during subduction and peak metamorphism. Using conventional geothermobarometry, a peak pressure of ca. 44-48 kbar at 560-760 degrees C followed by an S-shaped exhumation curve has been deduced. Gibbs free energy minimization modelling was used to supplement our analytical findings. (C) 2015 Elsevier B.V. All rights reserved.
KW  - Tso Morari
KW  - Coesite-bearing eclogite
KW  - Ultra-high pressure (UHP)
KW  - Rare earth element (REE) distribution
KW  - Laser ICP-MS
Y1  - 2015
U6  - https://doi.org/10.1016/j.lithos2015.06.007
SN  - 0024-4937
SN  - 1872-6143
VL  - 231
SP  - 77
EP  - 91
PB  - Elsevier
CY  - Amsterdam
ER  -