DOI: 10.1016/j.epsl.2018.02.011
Scopus记录号: 2-s2.0-85042273929
论文题名: Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes
作者: Ding W. ; Sun Z. ; Dadd K. ; Fang Y. ; Li J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 488 起始页码: 115
结束页码: 125
语种: 英语
英文关键词: lower crustal reflectors
; Moho reflection
; oceanic accretionary processes
; South China Sea
; southward ridge jump
Scopus关键词: Submarine geology
; Accretionary
; Internal structure
; Magnetic anomalies
; Multi-channel seismic
; Seafloor spreading
; South China sea
; South China Sea basin
; southward ridge jump
; Reflection
; accretion
; Cenozoic
; continental slope
; lower crust
; magnetic anomaly
; Moho
; oceanic crust
; seafloor spreading
; shear zone
; Pacific Ocean
; South China Sea
英文摘要: 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. © 2018 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109984
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China; Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266200, China; CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences (CAS), Guangzhou, 510301, China; School of Geoscience, University of SydneyNSW 2006, Australia
Recommended Citation:
Ding W.,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,2018-01-01,488