Studies in the tectonics of China : Extensional tectonics of the northern margin of the South China Sea; amalgamation and uplift of the Tian Shan; and wedge extrusion model for the Altyn Tagh Fault / Da Zhou

Zhou, Da
Bib ID
vtls002098925
出版項
Ann Arbor, Michigan : ProQuest Information and learning, 1998.
稽核項
1 online resource (354 pages).
電子版
附註項
數位化論文典藏聯盟
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$a Studies in the tectonics of China : $b Extensional tectonics of the northern margin of the South China Sea; amalgamation and uplift of the Tian Shan; and wedge extrusion model for the Altyn Tagh Fault / $c Da Zhou
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$a Dissertation Abstracts International ; $v 59-06B
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$a Source: Dissertation Abstracts International, Volume: 59-06, Section: B, page: 2637.
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$a Advisers: Stephan A. Graham; Gail Mahood.
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$a Thesis $b (Ph.D.)-- $c Stanford University, $d 1998
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$a Access restricted to Tamkang University users.
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$a Rift-onset ages for the south China margin obtained by construction of balanced cross-sections from seismic and well data indicate that rifting started at $\approx$50, $\approx$43-40, and $\approx$50 Ma in the Beibu Gulf, QDN, and PRM basins, respectively, all younger than conventionally assigned. Extension/time curves indicate continuous rifting prior to sea-floor spreading from 32-15.5 Ma in the SCS. Seismic profiles demonstrate diachronous cessation of rifting, from $\approx$30 Ma in the east to $\approx$23 Ma in the west, which might be coupled with the beginning of the sea-floor spreading at 32 Ma in the east and 23 Ma in the west. Those relations support a new kinematic model which combines the mechanism of slab-pull, leading to $\approx$1000 km of N-S extension, and extrusion of $<$100 km.
520
$a Reflection seismic profiles across the south China margin demonstrate two styles or types of rifting: (1) rifts with basement highs overlapped by post-rift sequences; (2) rifts with basement highs buried beneath syn-rift sequences. Extension estimated from supracrustal faults, subsidence, and crustal thickness data, indicate that type 2 rifting is related to greater extension ($\beta\approx2$), closer fault spacing ($\approx$5 km), and non-uniform stretching, whereas type 1 reflects lesser extension ($\beta $10 km).
520
$a Apatite fission-track data from the Chinese west Tian Shan indicate unroofing of $<$2 km during the Cenozoic except along the NTS fault zone where unroofing exceeded 3-4 km. Late Jurassic-Early Cretaceous unroofing was recorded in the south and north Tian Shan. Part of the Central Tian Shan retains late Paleozoic fission-track ages indicating $<$2 km of post-Paleozoic unroofing. The results support the existence of a Mesozoic ancestral Tian Shan.
520
$a A new wedge extrusion model for the Altyn Tagh region solves a dilemma of North China-Tarim-Qaidam relations created by previous palinspastic reconstructions by correlating two mid-Paleozoic sutures: Qilian Shan and Beishan. This model respects crustal mass balance during deformation and predicts net right-slip along the presently left-slip Altyn Tagh Fault.
591
$a 數位化論文典藏聯盟 $b PQDT $c 國家圖書館(2016)
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$a Geology.
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$a Graham, Stephan A., $e thesis advisor
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$a Mahood, Gail, $e thesis advisor
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$a Stanford University.
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$a Dissertation Abstracts International ; $v 59-06B
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$u http://info.lib.tku.edu.tw/ebook/redirect.asp?bibid=2098925
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叢書名
Dissertation Abstracts International ; 59-06B
Dissertation Abstracts International ; 59-06B
摘要
Rift-onset ages for the south China margin obtained by construction of balanced cross-sections from seismic and well data indicate that rifting started at $\approx$50, $\approx$43-40, and $\approx$50 Ma in the Beibu Gulf, QDN, and PRM basins, respectively, all younger than conventionally assigned. Extension/time curves indicate continuous rifting prior to sea-floor spreading from 32-15.5 Ma in the SCS. Seismic profiles demonstrate diachronous cessation of rifting, from $\approx$30 Ma in the east to $\approx$23 Ma in the west, which might be coupled with the beginning of the sea-floor spreading at 32 Ma in the east and 23 Ma in the west. Those relations support a new kinematic model which combines the mechanism of slab-pull, leading to $\approx$1000 km of N-S extension, and extrusion of $<$100 km.
Reflection seismic profiles across the south China margin demonstrate two styles or types of rifting: (1) rifts with basement highs overlapped by post-rift sequences; (2) rifts with basement highs buried beneath syn-rift sequences. Extension estimated from supracrustal faults, subsidence, and crustal thickness data, indicate that type 2 rifting is related to greater extension ($\beta\approx2$), closer fault spacing ($\approx$5 km), and non-uniform stretching, whereas type 1 reflects lesser extension ($\beta $10 km).
Apatite fission-track data from the Chinese west Tian Shan indicate unroofing of $<$2 km during the Cenozoic except along the NTS fault zone where unroofing exceeded 3-4 km. Late Jurassic-Early Cretaceous unroofing was recorded in the south and north Tian Shan. Part of the Central Tian Shan retains late Paleozoic fission-track ages indicating $<$2 km of post-Paleozoic unroofing. The results support the existence of a Mesozoic ancestral Tian Shan.
A new wedge extrusion model for the Altyn Tagh region solves a dilemma of North China-Tarim-Qaidam relations created by previous palinspastic reconstructions by correlating two mid-Paleozoic sutures: Qilian Shan and Beishan. This model respects crustal mass balance during deformation and predicts net right-slip along the presently left-slip Altyn Tagh Fault.
附註
Source: Dissertation Abstracts International, Volume: 59-06, Section: B, page: 2637.
Advisers: Stephan A. Graham; Gail Mahood.
Thesis
數位化論文典藏聯盟
合著者
ISBN/ISSN
9780591907988