Simultaneous Miocene Extension and Shortening in the Himalayan Orogen

The South Tibetan detachment system separates the high-grade metamorphic core of the Himalayan orogen from its weakly metamorphosed suprastructure. It is thought to have developed in response to differences in gravitational potential energy produced by crustal thickening across the mountain front. G...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 1992-11, Vol.258 (5087), p.1466-1470
Hauptverfasser: Hodges, K. V., Parrish, R. R., Housh, T. B., Lux, D. R., Burchfiel, B. C., Royden, L. H., Chen, Z.
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container_end_page 1470
container_issue 5087
container_start_page 1466
container_title Science (American Association for the Advancement of Science)
container_volume 258
creator Hodges, K. V.
Parrish, R. R.
Housh, T. B.
Lux, D. R.
Burchfiel, B. C.
Royden, L. H.
Chen, Z.
description The South Tibetan detachment system separates the high-grade metamorphic core of the Himalayan orogen from its weakly metamorphosed suprastructure. It is thought to have developed in response to differences in gravitational potential energy produced by crustal thickening across the mountain front. Geochronologic data from the Rongbuk Valley, north of Qomolangma (Mount Everest) in southern Tibet, demonstrate that at least one segment of the detachment system was active between 19 and 22 million years ago, an interval characterized by large-scale crustal thickening at lower structural levels. These data suggest that decoupling between an extending upper crust and a converging lower crust was an important aspect of Himalayan tectonics in Miocene time.
doi_str_mv 10.1126/science.258.5087.1466
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source JSTOR Archive Collection A-Z Listing; American Association for the Advancement of Science
subjects Cooling
Geology
Geology, Stratigraphic
Granite
Metamorphism
Minerals
Miocene
Miocene Epoch
Monazites
Morphotectonics
Orogens
Plutons
Shear zones
Stratigraphy
Tectonics
title Simultaneous Miocene Extension and Shortening in the Himalayan Orogen
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