台灣及鄰近地區隱沒與碰撞作用─(子計畫九)臺灣及鄰近地區之變形模式
Other Title
Deformation Mechanism of
Collisional Mountain Belt around Taiwan
Collisional Mountain Belt around Taiwan
Date Issued
1998
Date
1998
Author(s)
DOI
872116M002003
Abstract
Experimental modeling allows
description of the development and
kinematics of structures in mountain belts
formed during oblique convergence. In the
collision geometry of the Taiwan mountain
belt, the Chinese continental margin is
oriented about N60 ‧, whereas the N16 ‧
Philippine Sea plate backstop is moving
toward the Eurasian plate in a N55 ︱
direction. In addition to this oblique
convergence mechanism, most of the
foreland structures are strongly influenced by
the shape of the backstop and structural highs.
Sandbox experiments have been conducted to
simulate the neotectonics of western Taiwan. The kinematics of deformation comprises a
combination of compression and rotation,
which results in a local partitioning between
thrusting and strike-slip movements. The
results of specific analog models
demonstrated that: (1) most of the tableland
structures in the western Taiwan, such as the
Tatu, Pakua, Chungchou and Chia-Yi
tablelands can be interpreted as a hinge part
of drag anticline formed by fault-propagating
fold process; (2) most of the basin and plain
structures in the western Taiwan, such as
Taichung and Chianan basins, can be
interpreted as a part of piggy back basins; (3)
the frontal thrust may have the first
appearance of rupture in front of and between
the Peikang high and the Kuanyin high; (4)
NW trending link faults may be developing
within the transfer zones; and (5) an escape
structure formed to the south of the Peikang
high can be correlated with bathymetric map
and models.
Subjects
neotectonics
western Taiwan
sandbox
SDGs
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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