scholarly journals The metamorphism of the Tso Morari ultra-high pressure nappe of the Ladakh Himalaya

1970 ◽  
Vol 5 (7) ◽  
pp. 157-158
Author(s):  
Albrecht Steck ◽  
Jean-Luc Epard
Keyword(s):  
High Pressure ◽  
Special Issue ◽  
Ultra High Pressure ◽  
Ladakh Himalaya ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1336 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.157-8

scholarly journals Geohistory of Tso-Morari Crystalline, Eastern Ladakh, India: a plausible model for ultra-high pressure rocks in the Himalaya

1970 ◽  
Vol 5 (7) ◽  
pp. 139-140 ◽  
Author(s):  
Ram S Sharma
Keyword(s):  
High Pressure ◽  
Special Issue ◽  
Ultra High Pressure ◽  
Plausible Model ◽  
The Himalaya ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1321 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.139-140

scholarly journals The Tectonics of the Tso Morari Ultra High Pressure Nappe in Ladakh, NW Indian Himalaya

1970 ◽  
Vol 5 (7) ◽  
pp. 159-160
Author(s):  
Albrecht Steck ◽  
Jean-Luc Epard
Keyword(s):  
High Pressure ◽  
Special Issue ◽  
Indian Himalaya ◽  
Ultra High Pressure ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1337 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.159-160

scholarly journals Petrology and geochronology of eclogitic and retrograde micas from Tso Morari UHP Complex, Ladakh Himalaya

1970 ◽  
Vol 5 (7) ◽  
pp. 167
Author(s):  
Igor M Villa ◽  
Julia De Sigoyer ◽  
Stéphane Guillot
Keyword(s):  
Special Issue ◽  
Ladakh Himalaya ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1342 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.167

U–Pb zircon geochronology of eclogites from the Scandian Orogen, northern Western Gneiss Region, Norway: 14–20 million years between eclogite crystallization and return to amphibolite-facies conditionsThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.

2011 ◽  
Vol 48 (2) ◽  
pp. 441-472 ◽  
Author(s):  
Thomas E. Krogh ◽  
Sandra L. Kamo ◽  
Peter Robinson ◽  
Michael P. Terry ◽  
Kim Kwok
Keyword(s):  
High Pressure ◽  
Continental Collision ◽  
Amphibolite Facies ◽  
Granitic Pegmatite ◽  
Zircon Geochronology ◽  
Plate Tectonic ◽  
Special Issue ◽  
Western Gneiss Region ◽  
Garnet Pyroxenite ◽  
Ultra High Pressure

Reconstructing tectonic histories involving continental collision, subduction, and exhumation at plate-tectonic rates of ∼1 cm/year, requires precise U–Pb zircon geochronology. The Western Gneiss Region has exceptional exposures of high-pressure (HP) and ultra-high-pressure (UHP) rocks. The strategy adopted here involved sampling eclogite and associated late unstrained pegmatites to acquire the time of eclogite crystallization and subsequent exhumation, respectively. The oldest eclogite sampled is 415 ± 1 Ma from layered, probably UHP eclogite at Tevik, Averøya, also with a garnet–hornblende assemblage at 410 ± 1 Ma. The Flem Gabbro eclogite margin, with implied UHP conditions, is 410 ± 2 Ma. Hornblende eclogite at Seth, Lepsøya, never at UHP, is 412 ± 2 Ma. These compare to Devonian ages of 401 ± 1 Ma for overgrowths on Proterozoic baddeleyite in Selnes Gabbro, 402 ± 2 Ma for coesite eclogite at Hareidlandet, 405–400 Ma for coesite eclogite at Flatraket, and 405 ± 2 Ma for near-UHP eclogite at Hjelmelandsdalen. The 415 Ma eclogite at Tevik compares to granitic pegmatite in the same outcrop at 395.2 ± 1.3 Ma and to pegmatite in eclogite at Aspøya at 395.3 ± 2 Ma. The 410 Ma age at Flem compares to nearby pegmatite in eclogite at 396 ± 4 Ma. Collectively, these results imply 14–20 million years between deep eclogite crystallization at ∼130 km and return to amphibolite-facies conditions at ∼30 km, with crystallization of locally derived granitoid melts. Nearby garnet-pyroxenite records older ages (∼430) and greater depths (∼200 km), but on similar exhumation paths at ∼0.4–0.7 cm/year.

scholarly journals Amphibole compositions as indicators of deep crustal and mantle processes in subduction zones: case study – Tso Morari metamafics, Ladakh, Himalaya

1970 ◽  
Vol 5 (7) ◽  
pp. 144
Author(s):  
Preeti Singh ◽  
NC Pant ◽  
A Kundu ◽  
T Ahmad ◽  
PK Verma
Keyword(s):  
Subduction Zones ◽  
Special Issue ◽  
Ladakh Himalaya ◽  
Mantle Processes ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1325 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.144

scholarly journals The Tso Morari Nappe of the Ladakh Himalaya: formation and exhumation

1970 ◽  
Vol 5 (7) ◽  
pp. 52
Author(s):  
Jean-Luc Epard ◽  
Albrecht Steck
Keyword(s):  
Special Issue ◽  
Ladakh Himalaya ◽  
Tso Morari

DOI = 10.3126/hjs.v5i7.1254 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.52

Myrmekitic intergrowth of tourmaline and quartz in eclogite-hosting gneisses of the Tso Morari ultrahigh-pressure metamorphic terrane (Eastern Ladakh, India): a possible record of high-pressure conditions

2019 ◽  
Vol 481 (1) ◽  
pp. 175-194 ◽  
Author(s):  
Igor Broska ◽  
Peter Bačík ◽  
Santosh Kumar ◽  
Marian Janák ◽  
Sergiy Kurylo ◽  
...  
Keyword(s):  
High Pressure ◽  
Early Stage ◽  
Structural Disorder ◽  
Ultrahigh Pressure ◽  
Crystalline Complex ◽  
Ladakh Himalaya ◽  
Metamorphic Terrane ◽  
First Time ◽  
Tso Morari

AbstractAlkaline schorlitic tourmaline with domains of myrmekitic quartz and tourmaline intergrowths is reported for the first time from quartzo-feldspathic gneisses of the Tso Morari Crystalline Complex (TMCC), eastern Ladakh Himalaya. Except for schorlitic tourmaline, the brown-green dravitic tourmaline occurs in melanocratic layers of the gneiss. The schorlitic tourmaline contains REE-rich apatite, which is a typical mineral formed under high-pressure (HP) conditions. The observed myrmekite, marked by vermicular quartz and tourmaline intergrowths, was probably formed during decompression as a consequence of excess silica released from recrystallized tourmaline. The recalculated composition of the tourmaline with quartz myrmekite suggests that Si also occupied the tourmaline octahedral Z site during the HP regime. During decompression excess Si from this tourmaline was replaced by Mg and Fe3+. At an early stage of exhumation needle-shaped schorlitic tourmaline II and mosaic zoning were formed. The excess of silica and the structural disorder suggest that the Si-oversaturated tourmaline was stable at high-pressure–ultrahigh-pressure (HP–UHP) conditions. The greater stability of dravitic tourmaline compared to schorlitic tourmaline at HP conditions is evidently recorded at the TMCC. The tourmaline-bearing gneisses of the TMCC most probably shared the same metamorphic conditions during Tertiary collision of the Indian and Eurasian plates, similar to that observed for the associated UHP eclogites.

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