ODP/IODP 國際海洋鑽探研究計畫─子計畫六：南海北部板塊邊界表面跡之特徵及分佈(Ⅱ)
Date Issued
2004
Date
2004
Author(s)
俞何興
DOI
922611M002010
Abstract
Marine seismic reflection profiles
from offshore SW Taiwan combined
with onland geological data are used to
investigate the distribution and nature of
the deformation front wet of Taiwan.
Locations of the frontal structure west
of Taiwan are generally connected in a
linear fashion, although the alignment of
frontal structure 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 Submarinre
Canyon in a nearly N-S direction north
of 21 N until it reaches the upper
reaches of the Penghu Canyon at about
22 15 N. The deformation front then
changes direction sharply to the
northeast. It connects to the Chungchou
thrust fault 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. Ramp anticlines, diapiric
intrusion and incipient thrust faults are
commonly associated with the
deformation front. Variations in
structural style along strike can be
related to different stages of oblique
collision in Taiwan. The deformation
front (collision front) west of Taiwan
can be considered as a boundary
3
between contraction in the Taiwan
orogen and extension west of the
collisional 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 the plate boundary
between the Eurasian and Philippine Sea
plates.
Subjects
Taiwan
Deformation Front
Location
Characteristics
Seismics
SDGs
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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