ODP/IODP海洋鑽探計畫─子計畫七：南海北部板塊邊界表面跡之特徵及分佈
Date Issued
2003
Date
2003
Author(s)
俞何興
DOI
912611M002018
Abstract
Marine seismic reflection profiles
offshore SW Taiwan combined onland
geological data are used to investigate
distribution and nature of the
deformation front west of Taiwan.
Locations of the fronatal structure west
of Taiwan are generally connected into a
continuous line, although the alignment
of frontal structures is offset by
strike-slip faults. The deformation front
begins from the northern Manila Trench
near 21 N and continues northward
along the course of the Penghu
Submarine Canyon in a nearly N-S
direction north of 21 N until reaches
around 22 15 N at the upper reach of the
Penghu Canyon. The deformation front
then changes its directions sharly to
northeast. It connects to the Chungchou
anticline or the Tainan anticline in the
coastal plain and continues northwards
along the outer Western Foothills to the
northern coast of Taiwan near 25 N.
Characteristics of structural style, strain
regime, sedimentation and tectonics vary
along the trend of the deformation front.
Ramp anticline, diapiric intrusion and
incipient thrust fault are commonly
associated with the deformation front.
Variations of structural style along strike
of the deformation can be related to
different stages of oblique collision in
Taiwan. The collision front west of
2
Taiwan can be considered as a boundary
of strain regime separating contraction
in the Taiwan orogen and extension west
of the collision zone. The deformation
front east of the Tainan Basin and its
northward extension along the outer
limit of the Western Foothills is the
surface trace separating the foreland
thrust belt from the nearby foredeep, not
a boundary between the Chinese and
Taiwan margins. The submarine
deformation front off SW Taiwan is the
surface trace separating the submerged
Taiwan orogenic wedge from the
Chinese passive continental margin, not
a surface trace of plate boundary
between the Eurasian and the Philippine
Sea plates.
Subjects
Deformation Front
Distribution
Nature
Seismics
Taiwan
SDGs
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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