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South Tibetan Detachment : ウィキペディア英語版
South Tibetan Detachment

The South Tibet Detachment is one of the major faults in the Himalaya Mountains.
==Background==
Understanding the formation of the Himalayan mountains has been a goal of structural geologists for a long time. Many of the problems and disagreements that geologists have with each other concerning the Himalayan orogeny involve the relationship between the observed geometry, or structures, with the various rock units (different types of rock). There are three primary rock units present in the Himalaya: the Lesser Himalayan Sequence (LHS; mainly low-grade Proterozoic metasediments, ''yellow in map''), the Greater Himalayan Crystalline complex (GHC; largely high-grade paragneisses and migmatite, ''orange in map''), and the Tethyan Himalayan Sequence (THS; dominantly low-grade late Proterozoic to Eocene shelf sediments; ''blue in map'') More information about these rock units can be found by reading about the geology of Nepal. Because the Himalaya form on the leading edge of a collisional tectonic event, it stands to reason that many structural features will form in this area. The three main rock units: the LHS, GHC, and THS all have a hotly debated relationship with each other involving two main fault lines. One is the Main Central Thrust (MCT), and the other is the South Tibetan Detachment (STD). Tectonics geologists agree that the GHC, between the LHS and the THS, is between these two faults and is somehow being moved towards the surface and being exposed today. The South Tibetan Detachment is often interpreted as a low angle normal fault
and can also represent extension. However, there are new interpretations about old observations that support the idea that the STD can also be a north-directed thrust fault.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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