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Lal, Nand
- Early–Middle Eocene Exhumation of the Trans-Himalayan Ladakh Batholith, and the India–Asia Convergence
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Authors
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1 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
2 CSIR-Central Building Research Institute, Roorkee 247 667, IN
3 Sri Sri University, Cuttack 754 006, IN
1 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
2 CSIR-Central Building Research Institute, Roorkee 247 667, IN
3 Sri Sri University, Cuttack 754 006, IN
Source
Current Science, Vol 113, No 06 (2017), Pagination: 1090-1098Abstract
Very fast Early–Middle Eocene exhumation of theTrans-Himalayan Ladakh Batholith (LB) is revealedby new Rb–Sr biotite and zircon fission-track agesalong with the already published ages on these minerals.Exhumation peaked at 3.5 ± 0.9 mm/a between50–45 Ma (40Ar/39Ar hornblende ages) and 48–45 Ma(Rb–Sr biotite ages) as a consequence of the India–Asia convergence. It was followed by deceleration at arate of 1.2 ± 0.2 mm/a until 43–42 Ma (zircon FT ages),like the Deosai batholith in the west. Exhumationrates finally decreased during Oligocene to a minimumof ~0.1 mm/a before a mild late Miocene–Holocene acceleration. Lower-Middle Eocene exhumationof the LB was tectonically controlled by slabbreak-off of the Neo-Tethys oceanic lithosphere and underthrusting of the Himalayan Metamorphic Belt.Keywords
Early–Middle Eocene Exhumation, Fission Track, Ladakh Batholith, Tectonics.Full Text
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