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| Titel |
Structural analysis from reflection seismic data in the lower slope domain of the accretionary wedge offshore southwestern Taiwan |
| VerfasserIn |
Siou-Min Wun, Char-Shine Liu, Wei-Chung Han |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130611
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| Publikation (Nr.) |
 EGU/EGU2016-10888.pdf |
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| Zusammenfassung |
| The accretionary wedge offshore southwestern (SW) Taiwan was formed by the subduction
and arc-continent collision processes successively. Different structural styles were
observed in the frontal and rear segments of the accretionary wedge: blind thrusts and
monoclines are recognized in the frontal segment, while outcropping thrusts and
symmetrical anticlines are dominant in the rear segment. However, the deformation
mechanisms for the frontal and rear segments of the accretionary wedge are still poorly
understood.
In order to understand the development of the tectonic deformation in the accretionary
wedge, we reprocessed couple large-offset reflection profile data and generated depth
sections. Then we analyzed the dip angles between the strata and the fault-related-fold system
in a quantitative method proposed by Suppe [1983] based on the seismic images in
depth sections. Afterwards, the structures can be recognized in different types,
such as fault-propagation folds, fault-bend folds and detachment folds, at different
regions in our study area. Finally, we integrate all the geologic interpretations from
structural analyses into a geologic model to illustrate the deformation mechanisms and
the evolution of fold and fault structures in the frontal and rear segments of the
accretionary wedge. This study demonstrates that the geometry of the structures
and the deformation mechanisms may help reveal the tectonic evolution history. |
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