Thermal metamorphism of the Arunachal Himalaya, India: Raman thermometry and thermochronological constraints on the tectono-thermal evolution

Mathew, George; Sarkar, Sharmistha De; Pande, Kanchan; Dutta, Suryendu; Ali, Shakir; Apratim, K.; Netrawali, Shilpa

doi:10.1007/s00531-013-0904-6

Cited by 24 publications

(8 citation statements)

References 94 publications

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“…The Siyom River has a clearly defined 16 Ma age component sourced from Greater Himalayan Crystalline rocks within the drainage area. This age component is consistent with previous estimates of an early Miocene period of exhumation of Greater Himalayan Crystalline units along the Main Central thrust (e.g., Yin et al, 2010;Uddin et al, 2010;Mathew et al, 2013;Warren et al, 2014), exposed within the Siyom River drainage (Acharyya, 2007).…”

Section: Analyses Of River Sediment Samplessupporting

confidence: 91%

Rapid exhumation of the eastern Himalayan syntaxis since the late Miocene

Lang

Huntington

Burmester

et al. 2016

Geological Society of America Bulletin

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The Himalayan syntaxes are exceptionally dynamic landscapes characterized by high-relief topography and some of the most rapid and focused crustal exhumation on Earth. In the eastern Himalayan syntaxis, it has been hypothesized that thermomechanical feedbacks between erosion by the Yarlung River and growth of a crustalscale antiform may have locally sustained exhumation rates exceeding 5 km/m.y. during the late Pliocene and Pleistocene. However, young (younger than 3 Ma) cooling histories from syntaxial bedrock samples restrict interpretations of the timing and mechanism initiating feedback development. To extend this record of landscape evolution, we reconstructed an exhumation history since the late Miocene from analysis of detrital minerals in Himalayan foreland basin deposits. We combined magnetostratigraphy, detrital white mica 40 Ar/ 39 Ar thermochronology, and coupled zircon U-Pb and fission-track geothermochronology from a 4.6-km-thick stratigraphic section proximal to the eastern syntaxis. We used a simple thermal model to interpret the combined provenance and lag-time data set, concluding that rock exhumation rates in the core of the syntaxis increased by a factor of 5-10 in the late Miocene and have sustained extremely rapid exhumation rates (>5 km/m.y.) since 5 Ma. This onset significantly postdates the first appearance of Tibetan detritus in the Himalayan foreland, suggesting that thermomechanical feedbacks sustaining rapid exhumation are unrelated to river integration. Instead, such feedbacks may develop where large, antecedent rivers sustain elevated erosion rates across a region of enhanced rock uplift. Compilation of similar data sets across the Himalaya demonstrates extraordinary syntaxial exhumation histories, potentially resulting from peculiar geodynamics at these orogenic margins.

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Section: Analyses Of River Sediment Samplessupporting

confidence: 91%

Rapid exhumation of the eastern Himalayan syntaxis since the late Miocene

Lang

Huntington

Burmester

et al. 2016

Geological Society of America Bulletin

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“…Similar temperature ranges between 330 and 580°C have been obtained by RSCM in the LHS in central and western Nepal (Beyssac et al, 2004;Bollinger et al, 2004), NW Indian Himalaya (Célérier et al, 2009), and Arunachal Pradesh (Mathew et al, 2013). The inverted temperature gradients across the LHS estimated in these studies range from 25 to 50°C/km.…”

Section: 1029/2019tc005914supporting

confidence: 82%

Deformational Temperatures Across the Lesser Himalayan Sequence in Eastern Bhutan and Their Implications for the Deformation History of the Main Central Thrust

et al. 2020

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We postulate that the inverted metamorphic sequence in the Lesser Himalayan Sequence of the Himalayan orogen is a finite product of its deformation and temperature history. To explain the formation of this inverted metamorphic sequence across the Lesser Himalayan Sequence with a focus on the Main Central Thrust (MCT) in eastern Bhutan, we determined the metamorphic peak temperatures by Raman spectroscopy of carbonaceous material and established the deformation temperatures by Ti-in-quartz thermobarometry and quartz c axis textures. These data were combined with thermochronology, including new and published 40 Ar/ 39 Ar ages of muscovite and published apatite fission track, and apatite and zircon (U-Th)/He ages. To obtain accurate metamorphic, deformation, and closure temperatures of thermochronological systems, pressures and cooling rates for the period of interest were derived by inverse modeling of multiple thermochronological data sets, and temperatures were determined by iterative calculations. The Raman spectroscopy of carbonaceous material results indicate two temperature sequences separated by a thrust. In the external sequence, peak temperatures are constant across the structural strike, consistent with the observed hinterland-dipping duplex system. In the internal temperature sequence associated with the MCT shear zone, each geothermometer yields an apparent inverted temperature gradient although with different temperature ranges, and all temperatures appear to be retrograde. These observations are consistent with the quartz microfabrics. Further, all thermochronometers indicate upward younging across the MCT. We interpret our data as a composite peak and deformation temperature sequence that formed successively and reflects the broadening and narrowing of the MCT shear zone in which the ductile deformation lasted until~11 Ma.

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“…However, the thermal structure of the Nishisonogi unit remains poorly understood because the mineral assemblages are typically unsuitable for thermodynamic geothermobarometry and do not show systematic regional variation. A Raman carbonaceous material (CM) geothermometer has been recently calibrated for low-to medium-T metape-lites (150-650°C) (Beyssac et al, 2002;Rahl et al, 2005;Lahfid et al, 2010;Aoya et al, 2010;Kouketsu et al, 2014) and provides a powerful tool for studying the thermal structure of low-T metamorphic belts Bollinger et al, 2004;Negro et al, 2006Negro et al, , 2013Robert et al, 2010;Wiederkehr et al, 2011;Mathew et al, 2013;Yoshida et al, 2016). In this study, we determine the thermal structure of the Nishisonogi unit using Raman CM geothermometry.…”

Section: Introductionmentioning

confidence: 99%

Peak metamorphic temperature of the Nishisonogi unit of the Nagasaki Metamorphic Rocks, western Kyushu, Japan

Mori

Shigeno

Miyazaki

et al. 2019

Journal of Mineralogical and Petrological Sciences

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The Nishisonogi unit of the Nagasaki Metamorphic Rocks represents a part of a Late Cretaceous subduction complex exposed in western Kyushu, Japan. We estimate peak metamorphic temperatures using a Raman carbonaceous material (CM) geothermometer on 60 pelitic schists. No systematic regional changes were observed in the mineral assemblage of samples collected over a large area (about 30 × 15 km), which include chlorite ± garnet + white micas + albite + quartz + titanite + CM. However, the estimated peak metamorphic temperature increases structurally upward from 440 to 524°C, suggesting an inverted thermal gradient.

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Thermal metamorphism of the Arunachal Himalaya, India: Raman thermometry and thermochronological constraints on the tectono-thermal evolution

Cited by 24 publications

References 94 publications

Rapid exhumation of the eastern Himalayan syntaxis since the late Miocene

Rapid exhumation of the eastern Himalayan syntaxis since the late Miocene

Deformational Temperatures Across the Lesser Himalayan Sequence in Eastern Bhutan and Their Implications for the Deformation History of the Main Central Thrust

Peak metamorphic temperature of the Nishisonogi unit of the Nagasaki Metamorphic Rocks, western Kyushu, Japan

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