Thermal and baric evolution of garnet granulites from the Kharta region of S Tibet, E Himalaya

Borghi, Alessandro; Castelli, Daniele; Lombardo, B.; Visonà, Dario

doi:10.1127/0935-1221/2003/0015-0401

Cited by 30 publications

(58 citation statements)

References 52 publications

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“…1). In contrast to the high-grade mafic rocks of the area (Borghi et al, 2003;Rolfo et al, 2005;Liu et al, 2007;Cottle et al 2009a,b), these rocks record only traces of greenschist-facies metamorphism. Basic magmatism may be related either to the Cretaceous basic volcanism (see above) or to a much older orogeny, i.e., Bhimphedian.…”

Section: Introductionmentioning

confidence: 89%

“…Garnet-bearing metapelitic, metabasic and calc-silicate rocks of the Kharta Gneiss Complex preserve textural and chemical evidence of prograde equilibration at temperatures of at least 700-740°C and pressures around 5-8 kbar during the main event of the Himalayan metamorphism (Borghi et al, 2003;Cottle et al, 2009b). Post-deformational reaction textures include clinopyroxene (±orthopyroxene), plagioclase symplectite after garnet in calc-silicate rocks, and cordierite ± spinel coronas on sillimanite and garnet in metapelite granulite (Borghi et al, 2003;Liu et al, 2007).…”

Section: Geological Settingmentioning

confidence: 99%

“…Post-deformational reaction textures include clinopyroxene (±orthopyroxene), plagioclase symplectite after garnet in calc-silicate rocks, and cordierite ± spinel coronas on sillimanite and garnet in metapelite granulite (Borghi et al, 2003;Liu et al, 2007).…”

Section: Geological Settingmentioning

confidence: 99%

“…2a) and sometimes crosscut by mylonite bands. They most probably represent dykes transposed inside the foliation during the Himalayan event, and intrude garnet-biotite-sillimanite gneiss, apparently equal to those of the Kharta Gneiss Complex (Borghi et al, 2003).…”

Section: Field Observations and Petrographymentioning

confidence: 99%

See 3 more Smart Citations

The mafic rocks of Shao La (Kharta, S. Tibet): Ordovician basaltic magmatism in the greater himalayan crystallines of central-eastern Himalaya

Visonà

Rubatto

Villa

2010

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 89%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Field Observations and Petrographymentioning

confidence: 99%

See 2 more Smart Citations

The mafic rocks of Shao La (Kharta, S. Tibet): Ordovician basaltic magmatism in the greater himalayan crystallines of central-eastern Himalaya

Visonà

Rubatto

Villa

2010

Journal of Asian Earth Sciences

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“…Vannay and Hodges, 1996) referred as Eohimalayan HP-MT event (M1) of Eocene-Oligocene age, in which the GHS reached the highest pressure (in the kyanite stability field) and the Neohimalayan MP-HT Miocene event (M2). For instance, the GHS rocks studied by Liu et al (2007) experienced P-T conditions of 1.4 GPa and 750-800°C at 33 ± 2 Ma (zircon U-Pb SHRIMP) and then the original kyanite-bearing paragenesis in metapelites (e.g., Borghi et al, 2003) was overprinted by sillimanite-and cordierite-bearing paragenesis, associated with widespread melting, at 23 ± 2 Ma (Liu et al, 2007). Deformation within the GHS is dominantly characterized by general shear (e.g.…”

Section: Geological Overview Of the Himalayan Beltmentioning

confidence: 99%

Pressure–temperature–time–deformation path of kyanite-bearing migmatitic paragneiss in the Kali Gandaki valley (Central Nepal): Investigation of Late Eocene–Early Oligocene melting processes

Iaccarino

Montomoli

Carosi

et al. 2015

Lithos

110

119

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Kyanite-bearing migmatitic paragneiss of the lower Greater Himalayan Sequence (GHS) in the Kali Gandaki transect (Central Himalaya) was investigated. In spite of the intense shearing, it was still possible to obtain many fundamental information for understanding the processes active during orogenesis. Using a multidis- ciplinary approach, including careful meso- and microstructural observations, pseudosection modelling (with PERPLE_X), trace element thermobarometry and in situ monazite U–Th–Pb geochronology, we constrained the pressure–temperature–time–deformation path of the studied rock, located in a structural key position. The migmatitic gneiss has experienced protracted prograde metamorphism after the India–Asia colli- sion (50–55 Ma) from ~43 Ma to 28 Ma. During the late phase (36–28 Ma) of this metamorphism, the gneiss underwent high-pressure melting at “near peak” conditions (710–720 °C/1.0–1.1 GPa) leading to kyanite- bearing leucosome formation. In the time span of 25–18 Ma, the rock experienced decompression and cooling associated with pervasive shearing reaching P–T conditions of 650–670 °C and 0.7–0.8 GPa, near the sillimanite–kyanite transition. This time span is somewhat older than previously reported for this event in the study area. During this stage, additional, but very little melt was produced. Taking the migmatitic gneiss as representative of the GHS, these data demonstrate that this unit underwent crustal melting at about 1 GPa in the Eocene–Early Oligocene, well before the widely accepted Miocene decompressional melting related to its extrusion. In general, kyanite-bearing migmatite, as reported here, could be linked to the production of the high-Ca granitic melts found along the Himalayan belt

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Zircon U–Pb dating and phase equilibria modelling of gneisses from Dinggye area, Ama Drime Massif, central Himalaya

Wang

Zhang

et al. 2017

Geological Journal

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The tectonic affinity of the Ama Drime Massif in central Himalaya remains a subject of debate. We provide evidences of the metamorphic conditions and new geochronological data for orthogneiss and paragneiss in the Riwu area, eastern side of Ama Drime Massif. The peak P–T conditions for garnet gneiss is 13–14 kbar and 750–765 °C using phase equilibria modelling. The zircon U–Pb dating results reveal that the orthogneiss has a crystallization age of 1,848 ± 12 Ma and zircon rims age of 1,767 ± 18 Ma. Three major age peaks characterize all detrital zircons from the paragneisses: 975, 1,161, and 1,749 Ma. These new data integrated with previous literature data indicate that (a) the Ama Drime Massif might be ascribed to the Greater Himalayan Series; and (b) the Himalayan terrane may have been located closer to both the India and Lhasa terranes during the amalgamation of the supercontinent Columbia.

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Thermal and baric evolution of garnet granulites from the Kharta region of S Tibet, E Himalaya

Cited by 30 publications

References 52 publications

The mafic rocks of Shao La (Kharta, S. Tibet): Ordovician basaltic magmatism in the greater himalayan crystallines of central-eastern Himalaya

The mafic rocks of Shao La (Kharta, S. Tibet): Ordovician basaltic magmatism in the greater himalayan crystallines of central-eastern Himalaya

Pressure–temperature–time–deformation path of kyanite-bearing migmatitic paragneiss in the Kali Gandaki valley (Central Nepal): Investigation of Late Eocene–Early Oligocene melting processes

Zircon U–Pb dating and phase equilibria modelling of gneisses from Dinggye area, Ama Drime Massif, central Himalaya

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