Thermal evolution of the Greater Himalaya, Garhwal, India

Kip Hodges, D. S. Silverberg

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

The hanging wall of the Main Central Thrust (MCT) in Garhwal, India (roughly 79°N-80°E; 30°N-31°N), exhibits an inverted metamorphic gradient: sillimanite ± potassium feldspar assemblages near the top of the hanging wall, or Greater Himalayan sequence, are underlain by kyanite grade rocks near the fault. Textural relationships in pelitic samples from the Alaknanda and Dhauli river valleys indicate that the "inversion' is the product of two distinct metamorphic events: an early Barrovian event (M1), which affected the entire Greater Himalayan sequence and a later Buchan event (M2), the effects of which are most obvious in the upper part of the sequence. It is believed that the uplift and cooling path of the sequence was interrupted in late Oligocene(?)-Miocene time by a second burial and heating event (M2) related to thrust imbrications in southern Tibet. This burial was coincident with the generation of leucogranites, which are abundant near the top of the Greater Himalayan sequence but are virtually absent near the MCT. Although our data suggest no direct relationship between the Main Central Thrust (as mapped in Garhwal) and metamorphism in the Greater Himalaya, anatectic melting of an unexposed portion of the Greater Himalayan sequence could have been associated with movement along a blind thrust with characteristics similar to the mapped MCT in central Nepal. -from Authors

Original languageEnglish (US)
Pages (from-to)583-600
Number of pages18
JournalTectonics
Volume7
Issue number3
StatePublished - 1988
Externally publishedYes

Fingerprint

thermal evolution
India
thrust
Melting
Rivers
Rocks
Cooling
Heating
hanging wall
Nepal
imbrication
Tibet
kyanite
sillimanite
rivers
valleys
feldspar
Hot Temperature
Oligocene
grade

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Thermal evolution of the Greater Himalaya, Garhwal, India. / Hodges, Kip; Silverberg, D. S.

In: Tectonics, Vol. 7, No. 3, 1988, p. 583-600.

Research output: Contribution to journalArticle

Hodges, K & Silverberg, DS 1988, 'Thermal evolution of the Greater Himalaya, Garhwal, India', Tectonics, vol. 7, no. 3, pp. 583-600.
Hodges, Kip ; Silverberg, D. S. / Thermal evolution of the Greater Himalaya, Garhwal, India. In: Tectonics. 1988 ; Vol. 7, No. 3. pp. 583-600.
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