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- W2495022279 endingPage "1891" @default.
- W2495022279 startingPage "1863" @default.
- W2495022279 abstract "In order to understand mass and heat transfer processes that operated during Himalayan orogenesis, we collected temperature, finite and incremental strain, and kinematic vorticity data through a 5 km thickness of Lesser and Greater Himalayan rocks in southern Bhutan. This transect crosses two major shear zones, the Main Central thrust (MCT) and Shumar thrust (ST). Raman spectroscopy on carbonaceous material and garnet-biotite thermometry are integrated with deformation temperatures from quartz petrofabrics. These data define inverted field gradients that correspond in structural position with the MCT and ST, which are separated by sections in which temperatures remain essentially constant. Temperatures increase from ~400–500°C to ~700–750°C between 675 m below and 200 m above the MCT. This defines a 269 ± 44°C/km inverted gradient, interpreted to have formed via high-magnitude (~100–250 km) shearing on a discrete MCT zone delineated by the limits of inverted metamorphism. Temperatures increase from ~300–400°C to ~400–530°C across the ST, which is attributed to differences in maximum burial depth of hanging wall and footwall rocks. Strain and vorticity data indicate that Lesser and Greater Himalayan rocks were deformed by layer-normal flattening. Transport-parallel lengthening and foliation-normal shortening increase from 38–71% to 36–49%, respectively, between 2.3 and 1.0 km below the MCT. The MCT acted as a “stretching fault,” with translation on the order of hundreds of kilometers accompanied by transport-parallel stretching of footwall and hanging wall rocks on the order of tens of kilometers. This demonstrates that stretching accommodated between major shear zones can make a significant contribution to cumulative mass transfer." @default.
- W2495022279 created "2016-08-23" @default.
- W2495022279 creator A5016569002 @default.
- W2495022279 creator A5025869729 @default.
- W2495022279 creator A5063097620 @default.
- W2495022279 creator A5074304447 @default.
- W2495022279 date "2016-08-01" @default.
- W2495022279 modified "2023-10-06" @default.
- W2495022279 title "Temperature and strain gradients through Lesser Himalayan rocks and across the Main Central thrust, south central Bhutan: Implications for transport‐parallel stretching and inverted metamorphism" @default.
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