Growth and linkage of a complex oblique-slip fault zone in the Pearl River Mouth Basin, northern South China Sea.
In: Journal of Structural Geology, Jg. 117 (2018-12-01), S. 27-43
academicJournal
Zugriff:
Abstract Oblique-slip faults are ubiquitous in sedimentary basins, but have been largely neglected relative to their dip-slip counterparts. Case studies of oblique-slip faults are very limited. In this study, we used 3D seismic data, tied to well control, to investigate the geometry, kinematic characteristics, growth and linkage, and tempo-spatial evolution of a complex oblique-slip growth fault zone in the Pearl River Mouth Basin (PRMB) of the northern continental margin, South China Sea (SCS). The E-W-oriented 30.5-km-long fault zone consists of two superimposed oblique-slip fault systems. The lower fault system is an integrated zig-zag fault consisting of three ENE-WSW- to E-W-striking, right-stepping, sinistral en-echelon fault segments, which were hard-linked by two NW-SE-trending fault segments; while the upper fault system is composed of nine WNW-ESE-striking, left-stepping, dextral en-echelon component faults, which had overlapping fault tips and were partly hard-linked by breaching of the relay zones. The lower and upper fault systems were activated in the Eocene and the Oligocene to Pliocene, which respectively correspond to the syn-rift and post-rift stages in the PRMB. The fault throws (up to 288 m) and activity rates (up to 34.5 m/Ma) of the upper fault system are overall much less than those of its lower counterpart. Reactivation of the lower syn-rift fault system shows clear influence on the development of post-rift en-echelon fault segments. A four-stage evolution model of the oblique-slip fault zone was presented. Highlights • A complex oblique-slip fault zone consisting of superimposed syn-rift and post-rift fault systems was investigated. • The pre-existing syn-rift fault system shows a clear influence on the post-rift one. • Both fault systems show complicated growth and linkage characteristics. • A four-stage evolution model of the oblique-slip fault zone was presented. [ABSTRACT FROM AUTHOR]
Titel: |
Growth and linkage of a complex oblique-slip fault zone in the Pearl River Mouth Basin, northern South China Sea.
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Autor/in / Beteiligte Person: | Huang, Ke ; Zhong, Guangfa ; He, Min ; Liu, Lihua ; Wu, Zhe ; Liu, Xuefeng |
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Zeitschrift: | Journal of Structural Geology, Jg. 117 (2018-12-01), S. 27-43 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0191-8141 (print) |
DOI: | 10.1016/j.jsg.2018.09.002 |
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