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Structural evolution of slate belts:...

Yeh, En-Chao.

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Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania./
Author:	Yeh, En-Chao.
Description:	207 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3350.
Contained By:	Dissertation Abstracts International65-07B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3141029
ISBN:	0496881653

Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania.
Yeh, En-Chao.

Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania. - 207 p.

Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3350.

Thesis (Ph.D.)--The Pennsylvania State University, 2004.

The Taiwan mountain belt is a consequence of the oblique collision between the Luzon island arc of the Philippine Sea plate and the Asian continent margin. This active arc-continental collision imprints a distinct kinematic and thermal evolution on the Central Range of Taiwan. To characterize the kinematics of deformation and the thermal history within the Taiwan orogen, detailed structural mapping, strain analyses, and 40Ar- 39Ar dating were conducted along the eastern Central Range of Taiwan.

ISBN: 0496881653Subjects--Topical Terms:

516570
Geology.

Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania.
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100 1 $a Yeh, En-Chao. $3 1926101
245 1 0 $a Structural evolution of slate belts: Examples from Taiwan and eastern Pennsylvania.
300 $a 207 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3350.
500 $a Adviser: Donald Fisher.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2004.
520 $a The Taiwan mountain belt is a consequence of the oblique collision between the Luzon island arc of the Philippine Sea plate and the Asian continent margin. This active arc-continental collision imprints a distinct kinematic and thermal evolution on the Central Range of Taiwan. To characterize the kinematics of deformation and the thermal history within the Taiwan orogen, detailed structural mapping, strain analyses, and 40Ar- 39Ar dating were conducted along the eastern Central Range of Taiwan.
520 $a Based on my results from regional mapping and microstructure analysis, the structural history of the eastern Central Range of Taiwan is characterized. The earliest deformation in the eastern Central Range involves west-vergent folding and development of a slaty cleavage/schistosity with fiber overgrowths and progressive deformation of chlorite-mica aggregates. This deformation is followed by left lateral shearing and east-vergent backfolding that deforms the earlier fabrics. The east-vergent backfolding in the structural history of the eastern Central Range indicates that the east-facing mountain front between the Central Range and the Longitudinal Valley reflects a macro-scale reverse fault.
520 $a A regional west-to-east variation exists in extension direction from down-dip to along-strike across the Taiwan mountain belt. The regional change of extension direction is consistent with the incremental strain history in the samples of the eastern slate belt. The regional kinematics is also consistent with the kinematics of fiber overgrowth, i.e. the west-vergent thrusting is followed by the left lateral shearing. Thus, the regional extension pattern represents a change in shear direction and reflects a triclinic displacement field fixed to the geometric framework across the Taiwan mountain belt. As a consequence, the left lateral shear is indicative of strain partitioning associated with the margin-parallel component of the relative plate motion vector accommodated in the ductile metamorphic core of the mountain belt. Observations of structure and kinematics within the Taiwan mountain belt are consistent with the predictions of doubly-vergent wedge model and illustrate potential positive and negative feedbacks between anisotropy and strength that could be significant for the mechanics of mountain-building.
520 $a By using 40Ar-39Ar dating with an in-situ laser probe and total fusion techniques, the matrix and whole-rock mixing ages of a pre-Tertiary basement sample containing syntectonic biotite fibers within the eastern Central Range is determined as 9.8 +/- 3.8 Ma and 4.1&sim;3.3 Ma, respectively. The whole-rock mixing age of a slate sample from the eastern slate belt is determined as 28&sim;33 Ma. Our dating results establish that the thermal event associated with the recent collision did affect the cover and basement rocks and the deformation age in the pre-Tertiary basement rock is in the late Tertiary. This result implies that the thermo-deformation within the Taiwan mountain belt during the active collision is able to erase most fabrics related to the earlier orogenies and develop structures associated with current oblique collision event. The deformation instability due to the mechanic response of rock anisotropy developed in the foreland is the reason for multiple orientations of cleavages in the hinterland during ongoing arc-continental collision. Additionally, the regional backthrusting takes place after ca. 3.3 Ma, which is consistent with the timing of the backthrusting age (4.1 Ma) in the north. Thus, the maximum southward propagation rate of deformation is estimated as 65 Km/Ma in the Taiwan mountain belt.
590 $a School code: 0176.
650 4 $a Geology. $3 516570
650 4 $a Geochemistry. $3 539092
690 $a 0372
690 $a 0996
710 2 0 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 65-07B.
790 1 0 $a Fisher, Donald, $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3141029