Neotectonics of the Thakkhola graben and implications for recent activity on the South Tibetan fault system in the central Nepal Himalaya

Hurtado, J. M.; Hodges, Kip; Whipple, K. X.

doi:10.1130/0016-7606(2001)113<0222:nottga>2.0.co;2

Cited by 120 publications

(127 citation statements)

References 48 publications

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“…The activity along the higher STDu apparently started later and lasted longer (c. 19 Ma to 14 Ma, and perhaps is still active today, e.g. Hurtado et al 2001) than along the more ductile lower STD,. The structurally lowest MCT, appears as the youngest structure (c. 15 Ma to 0.7 Ma).…”

Section: Coeval Channel-bounding Structuresmentioning

confidence: 99%

Channel flow, ductile extrusion and exhumation in continental collision zones: an introduction

et al. 2006

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Abstract:The channel flow model aims to explain features common to metamorphic hinterlands of some collisional orogens, notably along the Himalaya-Tibet system. Channel flow describes a protracted flow of a weak, viscous crustal layer between relatively rigid yet deformable bounding crustal slabs. Once a critical low viscosity is attained (due to partial melting), the weak layer flows laterally due to a horizontal gradient in lithostatic pressure. In the Himalaya-Tibet system, this lithostatic pressure gradient is created by the high crustal thicknesses beneath the Tibetan Plateau and 'normal' crustal thickness in the foreland. Focused denudation can result in exhumation of the channel material within a narrow, nearly symmetric zone. If channel flow is operating at the same time as focused denudation, this can result in extrusion of the mid-crust between an upper normal-sense boundary and a lower thrust-sense boundary. The bounding shear zones of the extruding channel may have opposite shear sense; the sole shear zone is always a thrust, while the roof shear zone may display normal or ttuqast sense, depending on the relative velocity between the upper crust and the underlying extruding material. This introductory chapter addresses the historical, theoretical, geological and modelling aspects of channel flow, emphasizing its applicability to the Himalaya-Tibet orogen. Critical tests for channel flow in the Himalaya, and possible applications to other orogenic belts, are also presented.

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Section: Coeval Channel-bounding Structuresmentioning

confidence: 99%

Channel flow, ductile extrusion and exhumation in continental collision zones: an introduction

et al. 2006

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“…Consequently, sense of Mustang Fault is normal, down-throwing to the east. Lateral displacement of the topographic surface is not found, though Hurtado et al (2001) describes the fault (Dangardzong fault) is a dextral strike slip in sense.…”

Section: Mustang Faultmentioning

confidence: 99%

“…Development of those terraces was caused by complex of detritus supply due to glaciation, hydrological and tectonic conditions in this valley in the late Pleistocene and Holocene. There are some previous studies on geomorphological history along the Kali Gandaki River in the lower course from Kagbeni (Iwata et al 1982, Iwata 1984, Hasegawa and Sasaki 1998, Hurtado et al 2001.…”

Section: Fluvio-glacial Terraces As Time Markersmentioning

confidence: 99%

“…They are correlated as follows; Higher terrace group: MIS 4-3, Middle terrace group: MIS 2 and Lower terrace group: MIS 1, respectively, on the basis of their continuity along Kali Gandaki River, relative chronological level of terraces and radio carbon data obtained from terrace deposits (Iwata 1984, Hasegawa and Sasaki 1998, Hurtado et al 2001). The higher terrace group is at least older than 22,770 yrs BP (Hasegawa & Sasaki 1998).…”

Section: Fluvio-glacial Terraces As Time Markersmentioning

confidence: 99%

“…There are some chronological studies on Takkhola Formation, burring Mustang Graben, and studies on relation between upheaval of Himalaya Range and deposition of Takkhola Formation (Yoshida et al 1984). Hurtado et al (2001) reports neotectonics of the Takkhola Graben. There are, however, no detail studies based on a field research in the upper Mustang about the most recent active faulting such as deformation of fluvial terraces and glacial landforms developed in the late Pleistocene or Holocene.…”

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confidence: 99%

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Evolution of Mustang Graben, Tibet Himalayas, due to eastward extrusion of Tibet Plateau in and after the Last Glacial Age

Yagi

Maemoku

Kumahara

et al. 2008

Himalayan Journal of Sciences

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Synchronous N-S and E-W extension at the Tibet-to-Himalaya transition in NW Bhutan

et al. 2015

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Despite~50 Myr of continuous continent-continent collision, contractional structures in the Himalayan-Tibetan orogen are today limited to the northern and southern margins of the system, while extension dominates much of the interior. On the Tibetan Plateau, Cenozoic E-W extension has been accommodated by strike-slip faults and extensional grabens, while N-S extension at the Tibet-to-Himalaya transition has been accommodated by the South Tibetan fault system (STFS). The genetic relationship between N-S and E-W extension is disputed, although age constraints indicate temporal overlap of at least 7 Myr. In NW Bhutan the two intersect where the STFS basal detachment is cut by the Yadong cross structure (YCS), an extensional half graben that provides a rare opportunity to constrain relative timings. We report U-Pb zircon dates from four STFS footwall leucogranites consistent with episodic magmatism during the middle-late Miocene and in situ U(-Th)-Pb monazite and xenotime dates from three metasedimentary rocks ranging from late Oligocene to middle Miocene. We suggest that amphibolite facies footwall metamorphism was ongoing at the time the basal STFS detachment initiated as a ductile structure in the middle-late Miocene. Late-stage granitic intrusions may reflect footwall melting during extensional exhumation along the STFS, but post-metamorphic and post-intrusion fabrics suggest that most displacement occurred after emplacement of the youngest granites. Some of the oldest YCS-related fabrics are found in a deformed 14 Ma leucogranite, implying middle Miocene ductile deformation. This observation, along with evidence for subsequent brittle YCS deformation, suggests that N-S and E-W extensional structures in the area had protracted and overlapping deformation histories.

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Neotectonics of the Thakkhola graben and implications for recent activity on the South Tibetan fault system in the central Nepal Himalaya

Cited by 120 publications

References 48 publications

Channel flow, ductile extrusion and exhumation in continental collision zones: an introduction

Channel flow, ductile extrusion and exhumation in continental collision zones: an introduction

Evolution of Mustang Graben, Tibet Himalayas, due to eastward extrusion of Tibet Plateau in and after the Last Glacial Age

Synchronous N-S and E-W extension at the Tibet-to-Himalaya transition in NW Bhutan

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