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学科主题: Geochemistry & Geophysics
题名: Late Mesozoic compressional folds in Dongsha Waters, the northern margin of the South China Sea
作者: Yan, P ; Wang, LL ; Wang, YL
通讯作者: yanpin@scsio.ac.cn
关键词: Late Mesozoic ; Dongsha Basin ; Blind folds ; Back-thrust tectonics ; Far-field impact ; Subduction of proto-Pacific
刊名: TECTONOPHYSICS
发表日期: 2014
卷: 615, 页:213-223
收录类别: sci
部门归属: [Yan, Pin ; Wang, Yanlin] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Wang, Liaoliang] Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China ; [Yan, Pin] Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Peoples R China
项目归属: 海洋地质
资助者: Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources [MRE201203]; NSFC [91328205, 41376062, 41206039]; 729-Programme [GZH20110205]
摘要: Once considered as a component part of the Cenozoic Pearl River Mouth Basin (PRMB), Dongsha Waters was found with distinct tectono-stratigraphic style, in which the upper structural layer comprises only thin (usually 0.5-1 km) sediments of mid-Miocene to Quaternary, whereas the lower layer consists of Early Cretaceous terrestrial, Jurassic marine and possibly Triassic sedimentary rocks, totaled 4-9 km thick. The major sedimentary hiatus between them corresponds to the Late Cretaceous to mid-Miocene Epoch, well during the continental rifting to oceanic spreading stage. Faulting and magmatism during the opening of the South China Sea are basically weak over the central part of Dongsha Waters where the crustal thickness is mostly around 25 km thick, reflecting a relatively stable block. All these indicate less influence exerted by the Cenozoic rifting, strikingly contrasting to the neighboring areas where thick rift-to-drift sediments have accumulated. With the recognition of Mesozoic strata in this and the previous study, a relict Mesozoic basin is proposed to be existed over Dongsha Waters and named as Dongsha Basin. There are two generations, Late Neogene and Late Jurassic to Early Cretaceous, of compressions featuring seafloor and blind folds, respectively. The former presents only in few localities in east to Dongsha Island. The later distributes widely as individuals in north and as trains in south. They are characterized mostly by gentle growth folds inside which only a few minor upthrust faults with offsets in the order of a few tens to hundreds of meters. The upthrust faults dipped mostly southeastward against to the northwestward subduction of paleo-Pacific as suggested in a previous study. They featured more like back-thrust growth tectonics, formed a broad NNE-SSW trending belt oblique to the northern margin of the South China Sea, and thus are inferred to have been the far-field impact of the Late Mesozoic subduction of the proto-Pacific. (C) 2014 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000333003000015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10637
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Yan, P; Wang, LL; Wang, YL.Late Mesozoic compressional folds in Dongsha Waters, the northern margin of the South China Sea,TECTONOPHYSICS,2014,615():213-223
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