期刊
TECTONOPHYSICS
卷 710, 期 -, 页码 225-231出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2016.09.014
关键词
Sumatra; Oblique subduction; Strike-slip duplex; Strain partitioning; Forearc
资金
- Agency for the Assessment and Application of Technology (BPPT)
- Federal Ministry of Education and Research (BMBF), Germany [03G0137A, 03G0186A, 03G0189A]
- Indonesian Government
At the Sumatran oblique convergent margin the Mentawai Fault and Sumatran Fault zones accommodate most of the trench parallel component of strain. These faults bound the Mentawai forearc sliver that extends from the Sunda Strait to the Nicobar Islands. Based on multi-channel reflection seismic data, swath bathymetry and high resolution sub-bottom profiling we identified a set of wrench faults obliquely connecting the two major fault zones. These wrench faults separate at least four horses of a regional strike-slip duplex forming the forearc sliver. Each horse comprises an individual basin of the forearc with differing subsidence and sedimentary history. Duplex formation started in Mid/Late Miocene southwest of the Sunda Strait. Initiation of new horses propagated northwards along the Sumatran margin over 2000 km until Early Pliocene. These results directly link strike-slip tectonics to forearc evolution and may serve as a model for basin evolution in other oblique subduction settings. (C) 2016 Elsevier B.V. All rights reserved.
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