Structural insights into the early stages of exhumation along an orogen-scale detachment: The South Tibetan Detachment system, Dzakaa Chu section, eastern Himalaya
- Cottle, JM
- Jessup, MJ
- Newell, DL
- Searle, MP
- Law, RD
- Horstwood, MSA
DOIAbstract
Structural transects through the South Tibetan Detachment system (STDS) in the Dzakaa Chu valley, Tibet reveal a ∼1000-m thick, low-angle (<35°) zone of distributed ductile shear that displaces Paleozoic sediments over amphibolite facies gneisses, calc-mylonites and leucogranites of the Greater Himalayan Series (GHS). Within the shear zone, grain-size reduction with dynamic recrystallisation of quartz and growth of secondary phyllosilicates accommodated ductile deformation at elevated temperatures. Small-scale brittle normal faults and extensional shear veins overprint ductile features recording deformation at lower temperatures. Our structural data indicate that the Dzakaa Chu STDS records a progression from ductile- to brittle-deformation...
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