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Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes
Ding, WW; Sun, Z; Dadd, K; Fang, YX; Li, JB; wwding@sio.org.cn
2018
发表期刊EARTH AND PLANETARY SCIENCE LETTERS
卷号488页码:115-125
摘要Internal structures in mature oceanic crust can elucidate understanding of the processes and mechanism of crustal accretion. In this study, we present two multi-channel seismic (MCS) transects across the northern flank of the South China Sea basin to reveal the internal structures related to Cenozoic tectono-magmatic processes during seafloor spreading. Bright reflectors within the oceanic crust, including the Moho, upper crustal reflectors, and lower crustal reflectors, are clearly imaged in these two transects. The Moho reflection displays varied character in continuity, shape and amplitude from the continental slope area to the abyssal basin, and becomes absent in the central part of the basin where abundant seamounts and seamount chains formed after the cessation of seafloor spreading. Dipping reflectors are distinct in most parts of the MCS data but generally confined to the lower crust above the Moho reflection. These lower crustal reflectors merge downward into the Moho without offsetting it, probably arising from shear zones between the crust and mantle characterized by interstitial melt, although we cannot exclude other possibilities such as brittle faulting or magmatic layering in the local area. A notable feature of these lower crustal reflector events is their opposite inclinations. We suggest the two groups of conjugate lower crustal reflector events observed between magnetic anomalies C11 and C8 were associated with two unusual accretionary processes arising from plate reorganizations with southward ridge jumps. (C) 2018 The Author(s). Published by Elsevier B.V.
部门归属[Ding, Weiwei; Fang, Yinxia; Li, Jiabiao] State Ocean Adm, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China; [Ding, Weiwei] Qingdao Natl Lab Marine Sci & Technol, Qingdao 266200, Peoples R China; [Sun, Zhen] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Dadd, Kelsie] Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
学科领域Geochemistry & Geophysics
关键词[WOS]Moho reflection ; lower crustal reflectors ; southward ridge jump ; oceanic accretionary processes ; South China Sea
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17139
专题中科院边缘海地质重点实验室
通讯作者wwding@sio.org.cn
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GB/T 7714
Ding, WW,Sun, Z,Dadd, K,et al. Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes[J]. EARTH AND PLANETARY SCIENCE LETTERS,2018,488:115-125.
APA Ding, WW,Sun, Z,Dadd, K,Fang, YX,Li, JB,&wwding@sio.org.cn.(2018).Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes.EARTH AND PLANETARY SCIENCE LETTERS,488,115-125.
MLA Ding, WW,et al."Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes".EARTH AND PLANETARY SCIENCE LETTERS 488(2018):115-125.
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