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A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan: Alternating channel flow and critical taper mechanics of the eastern Himalaya

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A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan : Alternating channel flow and critical taper mechanics of the eastern Himalaya. / Chambers, Jennifer; Parrish, Randall; Argles, Tom; Harris, Nigel; Horstwood, Matthew.

In: Tectonics, Vol. 30, No. 2, TC2005, 01.04.2011.

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Chambers, Jennifer ; Parrish, Randall ; Argles, Tom ; Harris, Nigel ; Horstwood, Matthew. / A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan : Alternating channel flow and critical taper mechanics of the eastern Himalaya. In: Tectonics. 2011 ; Vol. 30, No. 2.

Bibtex

@article{83bb9379bf4d44fd84a10d398e26b588,
title = "A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan: Alternating channel flow and critical taper mechanics of the eastern Himalaya",
abstract = "In easternmost Bhutan the South Tibetan detachment (STD) is a ductile shear zone that juxtaposes the Radi (or Sakteng) klippe of the Tethyan Sedimentary Series from underlying high-grade Greater Himalayan rocks. In situ LA-ICPMS U-Th-Pb analysis of metamorphic monazite from the immediate footwall and hanging wall of the STD within the shear zone at the base of the klippe, constrains north-vergent normal shear to between 25 and 20 Ma. Coeval thrusting on the Main Central Thrust during this time supports a phase of channel flow–viscous wedge model activity, lasting only ca. 3 Ma. Geochronologic data from the eastern Himalaya indicate alternating mechanisms for extrusion of the metamorphic core of the orogen from the Late Oligocene through to the Late Miocene, switching from channel flow–viscous wedge behavior to critical taper–frictional wedge behavior, each phase lasting approximately only 2 to 5 Ma. The tectonic evolution of the eastern Himalaya is comparable to central and western Himalayan tectonics during the Early Miocene, but during the Middle Miocene metamorphism and magmatism in the eastern Himalaya migrated towards the orogenic hinterland, a process not widely documented elsewhere in the Himalaya, thus highlighting the need for an orogenic model in three spatial dimensions.",
author = "Jennifer Chambers and Randall Parrish and Tom Argles and Nigel Harris and Matthew Horstwood",
year = "2011",
month = apr,
day = "1",
doi = "10.1029/2010TC002784",
language = "English",
volume = "30",
journal = "Tectonics",
issn = "0278-7407",
publisher = "American Geophysical Union",
number = "2",

}

RIS

TY - JOUR

T1 - A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan

T2 - Alternating channel flow and critical taper mechanics of the eastern Himalaya

AU - Chambers, Jennifer

AU - Parrish, Randall

AU - Argles, Tom

AU - Harris, Nigel

AU - Horstwood, Matthew

PY - 2011/4/1

Y1 - 2011/4/1

N2 - In easternmost Bhutan the South Tibetan detachment (STD) is a ductile shear zone that juxtaposes the Radi (or Sakteng) klippe of the Tethyan Sedimentary Series from underlying high-grade Greater Himalayan rocks. In situ LA-ICPMS U-Th-Pb analysis of metamorphic monazite from the immediate footwall and hanging wall of the STD within the shear zone at the base of the klippe, constrains north-vergent normal shear to between 25 and 20 Ma. Coeval thrusting on the Main Central Thrust during this time supports a phase of channel flow–viscous wedge model activity, lasting only ca. 3 Ma. Geochronologic data from the eastern Himalaya indicate alternating mechanisms for extrusion of the metamorphic core of the orogen from the Late Oligocene through to the Late Miocene, switching from channel flow–viscous wedge behavior to critical taper–frictional wedge behavior, each phase lasting approximately only 2 to 5 Ma. The tectonic evolution of the eastern Himalaya is comparable to central and western Himalayan tectonics during the Early Miocene, but during the Middle Miocene metamorphism and magmatism in the eastern Himalaya migrated towards the orogenic hinterland, a process not widely documented elsewhere in the Himalaya, thus highlighting the need for an orogenic model in three spatial dimensions.

AB - In easternmost Bhutan the South Tibetan detachment (STD) is a ductile shear zone that juxtaposes the Radi (or Sakteng) klippe of the Tethyan Sedimentary Series from underlying high-grade Greater Himalayan rocks. In situ LA-ICPMS U-Th-Pb analysis of metamorphic monazite from the immediate footwall and hanging wall of the STD within the shear zone at the base of the klippe, constrains north-vergent normal shear to between 25 and 20 Ma. Coeval thrusting on the Main Central Thrust during this time supports a phase of channel flow–viscous wedge model activity, lasting only ca. 3 Ma. Geochronologic data from the eastern Himalaya indicate alternating mechanisms for extrusion of the metamorphic core of the orogen from the Late Oligocene through to the Late Miocene, switching from channel flow–viscous wedge behavior to critical taper–frictional wedge behavior, each phase lasting approximately only 2 to 5 Ma. The tectonic evolution of the eastern Himalaya is comparable to central and western Himalayan tectonics during the Early Miocene, but during the Middle Miocene metamorphism and magmatism in the eastern Himalaya migrated towards the orogenic hinterland, a process not widely documented elsewhere in the Himalaya, thus highlighting the need for an orogenic model in three spatial dimensions.

U2 - 10.1029/2010TC002784

DO - 10.1029/2010TC002784

M3 - Article

VL - 30

JO - Tectonics

JF - Tectonics

SN - 0278-7407

IS - 2

M1 - TC2005

ER -

ID: 4239878