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Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet./
Author:	Kapp, Paul Andrew.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2001,
Description:	409 p.
Notes:	Source: Dissertations Abstracts International, Volume: 63-09, Section: B.
Contained By:	Dissertations Abstracts International63-09B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3032850
ISBN:	9780493453682

Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet.
Kapp, Paul Andrew.

Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet. - Ann Arbor : ProQuest Dissertations & Theses, 2001 - 409 p.

Source: Dissertations Abstracts International, Volume: 63-09, Section: B.

Thesis (Ph.D.)--University of California, Los Angeles, 2001.

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

Constraining the timing and mechanisms of Tibetan plateau formation is significant for understanding how continental lithosphere deforms during collision and for addressing potential relationships between tectonics, climate, and ocean-water chemistry. Models assume that the Tibetan crust is homogeneous and that it thickened northward during the Cenozoic Indo-Asian collision by the same mechanisms that are observed to be active along the plateau margins. Testing these assumptions is hindered by our poor geologic understanding of the Tibetan interior. The goal for my research has been to constrain the crustal structure and thickening history of central Tibet through a combination of field-based structural, geochronologic, and petrologic studies. Deeply-exhumed rocks in the central Qiangtang provide windows into the deeper crust of central Tibet. They consist of blueschist-bearing melanges and occur in the footwalls of Late Triassic-Early Jurassic domal, low-angle normal faults. Thermochronologic studies coupled with application of a new titanite-rutile barometer suggest that the melanges were exhumed directly from >30 km depth by detachment faulting. As the melanges are structurally beneath Paleozoic-Mesozoic continental margin strata, they likely underplated central Tibet during early Mesozoic low-angle oceanic subduction and represent the central Tibetan deeper crust. This crustal structure contrasts sharply with that inferred for southern Tibet; this difference may help explain why Cenozoic crustal shortening and magmatism were localized >100 km north of the India-Asia suture zone, and why the central Tibetan crust exhibits anomalously high Poisson's ratios. Geologic mapping and geochronologic studies elucidate the style, magnitude, and dominant mechanism of crustal thickening in central Tibet. The Bangong-Nujiang suture zone between the Lhasa and Qiangtang terranes was significantly modified by Cretaceous-Tertiary upper-crustal shortening subsequent to ocean closure. This shortening was coeval with growth of a >200-km-wide east-plunging anticlinorium in the central Qiangtang. A possibility is that the Qiangtang anticlinorium formed above a thrust ramp at depth, while the Lhasa terrane underthrust northward beneath the Qiangtang terrane along the reactivated Bangong-Nujiang suture. This underthrusting began before and continued during the Indo-Asian collision. This hypothesis raises the provocative possibility for Tibetan plateau formation from the "inside-out" and beginning prior to the Indo-Asian collision.

ISBN: 9780493453682Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Bangong-Nujiang

Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet.
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245 1 0 $a Tectonic evolution of the Qiangtang terrane and Bangong -Nujiang suture zone, central Tibet.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2001
300 $a 409 p.
500 $a Source: Dissertations Abstracts International, Volume: 63-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Yin, An.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2001.
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 Constraining the timing and mechanisms of Tibetan plateau formation is significant for understanding how continental lithosphere deforms during collision and for addressing potential relationships between tectonics, climate, and ocean-water chemistry. Models assume that the Tibetan crust is homogeneous and that it thickened northward during the Cenozoic Indo-Asian collision by the same mechanisms that are observed to be active along the plateau margins. Testing these assumptions is hindered by our poor geologic understanding of the Tibetan interior. The goal for my research has been to constrain the crustal structure and thickening history of central Tibet through a combination of field-based structural, geochronologic, and petrologic studies. Deeply-exhumed rocks in the central Qiangtang provide windows into the deeper crust of central Tibet. They consist of blueschist-bearing melanges and occur in the footwalls of Late Triassic-Early Jurassic domal, low-angle normal faults. Thermochronologic studies coupled with application of a new titanite-rutile barometer suggest that the melanges were exhumed directly from >30 km depth by detachment faulting. As the melanges are structurally beneath Paleozoic-Mesozoic continental margin strata, they likely underplated central Tibet during early Mesozoic low-angle oceanic subduction and represent the central Tibetan deeper crust. This crustal structure contrasts sharply with that inferred for southern Tibet; this difference may help explain why Cenozoic crustal shortening and magmatism were localized >100 km north of the India-Asia suture zone, and why the central Tibetan crust exhibits anomalously high Poisson's ratios. Geologic mapping and geochronologic studies elucidate the style, magnitude, and dominant mechanism of crustal thickening in central Tibet. The Bangong-Nujiang suture zone between the Lhasa and Qiangtang terranes was significantly modified by Cretaceous-Tertiary upper-crustal shortening subsequent to ocean closure. This shortening was coeval with growth of a >200-km-wide east-plunging anticlinorium in the central Qiangtang. A possibility is that the Qiangtang anticlinorium formed above a thrust ramp at depth, while the Lhasa terrane underthrust northward beneath the Qiangtang terrane along the reactivated Bangong-Nujiang suture. This underthrusting began before and continued during the Indo-Asian collision. This hypothesis raises the provocative possibility for Tibetan plateau formation from the "inside-out" and beginning prior to the Indo-Asian collision.
590 $a School code: 0031.
650 4 $a Geology. $3 516570
650 4 $a Geochemistry. $3 539092
653 $a Bangong-Nujiang
653 $a Indo-Asian collision
653 $a Qiangtang
653 $a Suture zone
653 $a Tectonic evolution
653 $a Tibet
690 $a 0372
690 $a 0996
710 2 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertations Abstracts International $g 63-09B.
790 $a 0031
791 $a Ph.D.
792 $a 2001
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3032850