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Metamorphic evolution of the Tethyan Himalayan flysch in SE Tibet

Author:
Dunkl, I.   AntolIn, B.   Wemmer, K.   Rantitsch, G.   Kienast, M.   Montomoli, C.   Ding, L.   Carosi, R.   Appel, E.   El Bay, R.   Xu, Q.   Von Eynatten, H.  


Journal:
Geological Society, London, Special Publications


Issue Date:
2011


Abstract(summary):

The metamorphic conditions and the age of thermal overprint were determined in metapelites, metaarenites and metabasites of the Tethyan Himalayan Sequence (THS) in SE Tibet using Kubler Index and vitrinite reflectance data and applying thermobarometrical (Thermocalc and PERPLEX) and geochronological methods (illite/muscovite K-Ar and zircon and apatite (U-Th)/ He chronology). The multiple folded thrust pile experienced a thermal overprint reaching locally peak conditions between the diagenetic stage (c. 170 degrees C) and the amphibolite facies (c. 600 degrees C at 10 kbar). Burial diagenesis and heating due to Early Cretaceous dyke emplacement triggered the growth of illite in the metapelites. Eocene collision-related peak metamorphic conditions have been reached at c. 44 Ma. During collision the different tectonic blocks of the THS were tectonically buried to different structural levels so that they experienced maximum greenschist to amphibolite facies metamorphism. Later, during Oligocene to Miocene times the entire THS underwent anchi- to epizonal metamorphic conditions, probably associated to continuous deformation in the flysch fold-thrust-system. This period terminated at c. 24-22 Ma. Adjacent to the north Himalayan metamorphic domes, the base of the THS was metamorphosed during Miocene times (c. 13 Ma). Post-metamorphic cooling below c. 180 degrees C lasted until Late Miocene and took place at different times.


Page:
45-69


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