The metamorphic signature of contemporaneous extension and shortening in the central Himalayan orogen

data from the Nyalam transect, southern Tibet

Kip Hodges, B. C. Burchfiel, L. H. Royden, Z. Chen, Y. Liu

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

Geological relationships and geochronological data suggest that in Miocene time the metamorphic core of the central Himalayan orogen was a wedge-shaped body bounded below by the N-dipping Main Central thrust system and above the N-dipping South Tibetan detachment system. Synchronous movement on these fault systems expelled the metamorphic core southward toward the Indian foreland, thereby moderating the extreme topographic gradient at the southern margin of the Tibetan Plateau. Reaction textures, thermobarometric data and thermodynamic modelling of pelitic schists and gneisses from the Nyalam transect in southern Tibet (28°N, 86°E) imply that gravitational collapse of the orogen produced a complex thermal structure in the metamorphic core. Amphibolite facies metamorphism and anatexis at temperatures of ≥950 K and depths of at least 30 km accompanied the early stages of displacement on the Main Central thrust system. The findings suggest that the late metamorphic history of these rocks was characterized by high-T decompression associated with roughly 15 km of unroofing by movement on the South Tibetan detachment system. -from Authors

Original languageEnglish (US)
Pages (from-to)721-737
Number of pages17
JournalJournal of Metamorphic Geology
Volume11
Issue number5
StatePublished - 1993
Externally publishedYes

Fingerprint

transect
thrust
Textures
Rocks
Thermodynamics
unroofing
anatexis
thermal structure
decompression
amphibolite facies
schist
metamorphism
thermodynamics
texture
Miocene
plateau
Temperature
history
rock
modeling

ASJC Scopus subject areas

  • Geology

Cite this

The metamorphic signature of contemporaneous extension and shortening in the central Himalayan orogen : data from the Nyalam transect, southern Tibet. / Hodges, Kip; Burchfiel, B. C.; Royden, L. H.; Chen, Z.; Liu, Y.

In: Journal of Metamorphic Geology, Vol. 11, No. 5, 1993, p. 721-737.

Research output: Contribution to journalArticle

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