Crustal features of the northeastern South China Sea: Insights from seismic and magnetic interpretations

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题名:	Crustal features of the northeastern South China Sea: Insights from seismic and magnetic interpretations
作者:	葉一慶;Yeh, Yi-Ching;Hsu, Shu-Kun;Doo, Wen-Bin;Sibuet, Jean-Claude;Liu, Char-Shine;Lee, Chao-Shing
贡献者:	地球科學學院地球科學學系
关键词:	Earth and Environmental Science;Earth Sciences;Geophysics/Geodesy;Magma;Magnetic reversals;Marine;Miocene;Ocean bottom;Oceanic crust;Oceanography;Offshore Engineering;Original Research Paper;Plate tectonics;Pliocene;Seismology;Submarine volcanoes;Volcanoes
日期:	2012-01-01
上传时间:	2026-04-23 11:31:05 (UTC+8)
出版者:	Springer Netherlands;Dordrecht: Springer Netherlands
摘要:	摘要： We interpret seven two-dimensional deep-penetration and long-offset multi-channel seismic profiles in the northernmost South China Sea area, which were collected by R/V Marcus G. Langseth during the TAIwan GEodynamics Research (TAIGER) project in 2009. To constrain the crustal characteristics, magnetic inversion and forward magnetic modeling were also performed. The seismic results clearly show tilted faulting blocks in the upper crust and most of the fault plane connects downward to a quasi-horizontal detachment as its bottom in the south of the Luzon-Ryukyu transform plate boundary. North of the plate boundary, a small-scale failed rifted basin (minimum 5 km in crustal thickness) with negative magnetization probably indicates an extended continental origin. Significant lower crustal material (LCM) was imaged under a crustal fracture area which indicated a continent and ocean transition origin. The thickest LCM (up to 6.5 km) is located at magnetic isochron C15 that is probably caused by the magma supply composite of a Miocene syn-rift volcanic event and Pliocene Dongsha volcanic activity for submarine volcanoes and sills in the surrounding area. The LCM also caused Miocene crustal blocks to be uplifted reversely as 17 km crustal thickness especially in the area of magnetic isochron C15 and C16. In addition, the wide fault blocks and LCM co-existed on the magnetic striped area (i.e. C15–C17) in the south of the Luzon-Ryukyu transform plate boundary. Magnetic forward modeling suggests that the whole thick crustal thickness (>12 km thick) needs to be magnetized in striped way as oceanic crust. However, the result also shows that the misfit between observed and synthetic magnetic anomaly is about 40 nT, north of isochron C16. The interval velocity derived from pre-stack time migration suggests that the crust is composed of basaltic intrusive upper crust and lower crustal material. The crustal nature should refer to a transition between continent and ocean. Thus, the magnetic reversals may be produced in two possible ways: basaltic magma injected along the crustal weak zone across magnetic reversal epoch and because some undiscovered ancient piece of oceanic crust existed. The crustal structure discrimination still needs to be confirmed by future studies. 其他題名： Mar Geophys Res 出版者： Dordrecht: Springer Netherlands 出版日期： 2012-12 出處： Marine geophysical researches, 2012-12, Vol.33 (4), p.307-326 資源來源： Springer Nature Link Journals 版權： Springer Science+Business Media B.V. 2012 版權： Springer Science+Business Media Dordrecht 2012 識別號： ISSN: 0025-3235 識別號： EISSN: 1573-0581 識別號： DOI: 10.1007/s11001-012-9154-4
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