Timescales of melt generation and the thermal evolution of the Himalayan metamorphic core, Everest region, eastern Nepal

Viskupic, Karen; Hodges, Kip; Bowring, Samuel A.

doi:10.1007/s00410-004-0628-5

Cited by 82 publications

(70 citation statements)

References 66 publications

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“…The anatexis of the HHCS is generally interpreted as a consequence of nearly isothermal decompression from the kyanite to the sillimanite field (e.g., Harrison et al, 1997;Patino Douce and Harris, 1998;Harris et al, 2004;Zhang et al, 2004;Viskupic et al, 2005). However, recent phase equilibria modeling for anatectic HP granulites from the HHCS of east-central Himalayas revealed that melt production was probably related to both the white mica and the biotite dehydration melting, and was mainly…”

Section: Accepted Manuscriptmentioning

confidence: 94%

Oligocene HP metamorphism and anatexis of the Higher Himalayan Crystalline Sequence in Yadong region, east-central Himalaya

et al. 2017

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Section: Accepted Manuscriptmentioning

confidence: 94%

Oligocene HP metamorphism and anatexis of the Higher Himalayan Crystalline Sequence in Yadong region, east-central Himalaya

et al. 2017

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“…In the HHC, in fact, crustal anatexis is generally interpreted as a consequence of nearly isothermal decompression from the kyanite to the sillimanite field (e.g. Pognante and Benna, 1993;Harris et al, 2004;Viskupic et al, 2005).…”

Section: Kyanite-bearing Migmatites In the Mctzmentioning

confidence: 99%

“…The lower part of HHC is a 6-7 km thick sequence in which upper amphibolite-to medium-P granulite-facies metasediments (Barun Gneiss;Bordet, 1961;Brunel and Kienast, 1986;Lombardo et al, 1993;Pognante and Benna, 1993;Goscombe et al, 2006) are associated with large tabular bodies of granitic orthogneisses (Namche Migmatite Orthogneiss; Lombardo et al, 1993). The granite protolith is Early Paleozoic (Ferrara et al, 1983;Tonarini et al, 1994;Viskupic et al, 2005). Both the metasediments and the orthogneisses display evidence of medium-to low-P partial melting due to hydrate-minerals breakdown and are characterized by sillimanite ± cordierite assemblages.…”

Section: The Arun-makalu Transectmentioning

confidence: 99%

Early Oligocene partial melting in the Main Central Thrust Zone (Arun valley, eastern Nepal Himalaya)

Groppo

Rubatto

Rolfo

et al. 2010

Lithos

116

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The Main Central Thrust Zone (MCTZ) is a key tectonic feature in the architecture of the Himalayan chain. In the Arun valley of the eastern Nepal Himalaya, the MCTZ is a strongly deformed package of amphibolite-to granulite facies metapelitic schist and granitic orthogneiss. This package is tectonically interposed between the underlying, low-grade, Lesser Himalaya sequences and the overlying, high-grade and locally anatectic, Higher Himalayan Crystallines (HHC). The MCTZ is characterized by a well documented inverted metamorphism from the Grt-Bt zone, across the Ky-in, St-in and -out, Kfs-in, Ms-out and Sil-in isograds. Partial melting with local occurrence of migmatitic segregations has been rarely reported from the highest structural levels of the MCTZ. While it is widely accepted that thrusting along the MCT occurred during the Miocene, geochronological data constraining the timing of crustal anatexis in the upper portion of the MCTZ are still lacking. In order to understand the link between partial melting in the MCTZ and the Miocene activation of the MCT, we present the P-T-time evolution of a kyanite-bearing anatectic gneiss occurring at the highest structural levels of the MCTZ, along the Arun-Makalu transect (Eastern Nepal). Microstructural observations combined with P-T pseudosection analysis show that dehydration partial melting occurred in the kyanite-field. After reaching peak conditions at about 820°C, 13 kbar, the studied sample experienced decompression accompanied by cooling down to 805°C, 10 kbar, which caused in situ melt crystallization. SHRIMP monazite and zircon geochronology provides evidence that the anatexis affecting the upper portion of the MCTZ occurred during Early Oligocene (~31 Ma). These results demonstrate that in the upper MCTZ, at least in the eastern Himalaya, crustal anatexis was earlier than, and not a consequence of, decompression linked to exhumation along the MCT.2

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“…The N-S trending extension and associated strikeslip faults developed mainly in the Himalaya Terrane between 23 and Lithos 245 (2016) [118][119][120][121][122][123][124][125][126][127][128][129][130][131][132] 12 Ma (Guillot et al, 1994;Mitsuishi et al, 2012;Searle, 1999;Viskupic et al, 2005;Zhang and Guo, 2007). N-S extension also affected the Lhasa Terrane during the Paleocene to Eocene and is represented by a series of E-W trending mafic dykes and sedimentary basins (Mo et al, 2008;Yue and Ding, 2006).…”

Section: Introductionmentioning

confidence: 99%

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

Huang

Chen

et al. 2016

Lithos

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Timescales of melt generation and the thermal evolution of the Himalayan metamorphic core, Everest region, eastern Nepal

Cited by 82 publications

References 66 publications

Oligocene HP metamorphism and anatexis of the Higher Himalayan Crystalline Sequence in Yadong region, east-central Himalaya

Oligocene HP metamorphism and anatexis of the Higher Himalayan Crystalline Sequence in Yadong region, east-central Himalaya

Early Oligocene partial melting in the Main Central Thrust Zone (Arun valley, eastern Nepal Himalaya)

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

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