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Synconvergence spreading of the Higher Himalaya Crystalline in Ladakh

Article Abstract:

The Higher Himalaya Crystalline in Ladakh, northwestern Himalaya was generated by regional extension around 25 Ma due to post-thickening, high-temperature conditions resulting in an asymmetric gneiss dome. This event was restricted to the Indian crust overlying the Main Central Thrust (MCT), upon which thrusting continued beyond the termination of the event. During the process of thermal softening, the MCT acted as a decoupling zone between the lower and upper Indian crust. Analysis suggests that synconvergent extension was favored by thermally anomalous layers.

Author: Gilbert, E., Gapais, D., Pecher, A., Ballevre. M.
Publisher: American Geophysical Union
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
Origin, Rocks, Ladakh, India, Rocks, Crystalline

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Article Abstract:

Extension of the Kobayashi (1941) amd Kimura (1974) geodynamic models of southwest Japan complemented a basic description of symmetrical rock distribution in the area. Analysis suggests that Siluro-Devonian strata were deposited on what may have been eastern Gondwana, and southward subduction of an oceanic plate beneath this may explain structural evidence in the area. Faure et. al. disagree with this model, despite the South China block's Gondwanian origin. Their comments may be refuted in the light of the data gathered.

Author: Otoh, Shigeru, Yamakita, Satoshi, Yanai, Shuichi
Publisher: American Geophysical Union
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
Japan, Gondwana (Geology), Gondwana, Paleozoic Era, Geodynamics, Paleogeography

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Some thermal and paleomagnetic consequences of tilting a batholith

Article Abstract:

A rock body that is deformed after magnetization will have titled vectors. However, if tilting occurs at a high temperature and the body is consequently magnetized after cooling, its vectors will not show the direction of tilt. High tempratures generated by erosion and rapid uplift will delay magnetization until after tilting. Nevertheless, unique conditions are necessary for the formation of plutons with magnetic records inconsistent with tilt, and few such examples have been studied.

Author: Beck, Myrl E., Jr.
Publisher: American Geophysical Union
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
Paleomagnetism, Batholiths

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Subjects list: Research, Natural history, Rock deformation
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