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Tectonic evolution of southwest Tibet.

Murphy, Michael Andrew.

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Tectonic evolution of southwest Tibet.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Tectonic evolution of southwest Tibet./
作者:	Murphy, Michael Andrew.
面頁冊數:	212 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4045.
Contained By:	Dissertation Abstracts International61-08B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9981708
ISBN:	9780599882478

Tectonic evolution of southwest Tibet.
Murphy, Michael Andrew.

Tectonic evolution of southwest Tibet. - 212 p.

Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4045.

Thesis (Ph.D.)--University of California, Los Angeles, 2000.

This item must not be sold to any third party vendors.

Through an integrated field-based approach, this research attempts to constrain the deformation history of rocks within the Tibetan-Himalayan orogen in southwest Tibet. Specifically, structural, sedimentologic, geochronologic, geochemical, and thermobarometric data are used to both test existing kinematic models of the Tibetan-Himalayan orogen and develop more accurate models that incorporate the new data.

ISBN: 9780599882478Subjects--Topical Terms:

516570
Geology.

Tectonic evolution of southwest Tibet.
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245 1 0 $a Tectonic evolution of southwest Tibet.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4045.
500 $a Chair: An Yin.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2000.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Through an integrated field-based approach, this research attempts to constrain the deformation history of rocks within the Tibetan-Himalayan orogen in southwest Tibet. Specifically, structural, sedimentologic, geochronologic, geochemical, and thermobarometric data are used to both test existing kinematic models of the Tibetan-Himalayan orogen and develop more accurate models that incorporate the new data.
520 $a Restoration of a 111 km-long traverse from the junction between the India, Nepal, and China borders to Mt. Kailas in southwest Tibet indicates a total of 176 km of north-south horizontal shortening within the Tethyan fold-thrust belt and Indus-Yalu suture zone. A sequential restoration shows that the locus of shortening prior to the late Oligocene occurred significantly south (>60 km) of the Indus-Yalu suture zone within the Tethyan fold-thrust belt and that oceanic lithosphere was present south of the suture until the middle Miocene. An implication of this result is that post-collision high-K, calc-alkaline magmatism may be readily explained by melting due to active subduction of oceanic lithosphere beneath Tibet until the middle Miocene.
520 $a The net slip on the Karakoram fault system is estimated by restoring a piercing line defined by the South Kailas thrust system. Assuming the thrust system is planar across the Karakoram fault, we calculate 66 +/- 5.5 km of normal right slip. Documentation of the activity on the South Kailas thrust at 13 Ma implies that the Karakoram fault in southwest Tibet did not initiate until after the cessation of motion on the thrust. However, field investigations of the central portion of the Karakoram fault system show that the fault was active at 17 Ma and has accumulated a maximum of 150 km of right slip since that time. I suggest that these along strike variations in the magnitude of slip and timing constraints are best explained by southward propagation of the Karakoram fault system.
520 $a Field mapping, geochronologic, geochemical, and thermobarometric analysis of the Gurla Mandhata area reveal major east-west extension along the Gurla Mandhata detachment system. The maximum fault slip occurs along a pair of low-angle normal faults, resulting in juxtaposition of low-grade Paleozoic rocks and Tertiary sediments in its hanging wall over amphibolite-facies rocks and variably deformed leucogranite bodies in its footwall. Shear-sense indicators in the footwall mylonitic rocks define a ≥2.1 km-thick ductile shear zone. 40Ar/39Ar mica data from the footwall rocks indicate that they cooled below <400°C ca. 9 Ma. Pressure/depth estimates of the footwall rocks are used to constrain a total slip estimate on the detachment system between 66 and 35 km. The slip estimate, timing constraint, and kinematics on the detachment system correlate to those on the right-slip Karakoram fault system, and supports that the two are linked. This implies that the Karakoram fault extends to mid-crustal depths and extends as a major crustal right-slip shear zone into the High Himalaya of far-western Nepal.
590 $a School code: 0031.
650 4 $a Geology. $3 516570
690 $a 0372
710 2 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 61-08B.
790 $a 0031
791 $a Ph.D.
792 $a 2000
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9981708