气候变化领域集成服务门户(CCPortal): Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin, Northern South China Sea

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DOI	10.1111/1755-6724.14626
	Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin, Northern South China Sea
	Feng Yangwei; Ren Yan; Lyu Chengfu; Zhang Peng; Chen Ying; Jin Li
通讯作者	Lyu, CF (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	1000-9515
EISSN	1755-6724
起始页码	131
结束页码	141
卷号	95 期号:1
英文摘要	Research into the contourite deposits in the Upper Meishan Formation of the southern Qiongdongnan Basin in South China Sea is weak; their characteristics, distribution and original geological conditions are not clear. Using geological and geophysical methods including seismic and drilling data, based on seismic reflection characteristics, geometrical configuration description, and wave impedance inversion, two types of contourite deposits are recognized. Contourite deposits have blurred boundaries between each deposit and disordered internal seismic reflections; They are mound-shaped only in transverse section, and banded in the longitudinal direction. Type I contourite deposits are conical, with medium-high amplitude, low-continuity, low-frequency mound-shaped seismic facies, and subparallel-chaotic reflections internally. These deposits are conical with sharp tops, the canal between mounds is V-shaped and deep. The western wing is gentle and the eastern wing is steep, with the slope toe mostly between 10 degrees and 20 degrees, and width height ratio about 1-2. Type II contourite deposits are flat, exhibiting medium-amplitude, medium-continuity, low-frequency mound-shaped seismic facies, with subparallel weak reflections internally. Their mounds are flat with gently arced tops, with shallow canals between. The slope toe is between 5 degrees and 10 degrees, with a width height ratio of about 2-5. The wave impedance value of these contourite deposits is 4.6 kg/m(3)xm/s to 6.8 kg/m(3)xm/s, about 5.8 kg/m(3)xm/s on average, which is presumed to represent marly-calcareous clastic sediments. The contourite deposits mainly develop beneath the slope break at the margin of the fault-controlled platform in the Southern Uplift zone of the basin. In plane view, they are distributed approaching a west-to-east direction, and in section, lie in low-lying areas near the faults at fault-controlled terraces of the Southern Uplift zone, with a paleo-current direction nearly west-to-east. The paleotectonic setting of the gentle monoclinic platform was favorable for the development of such contourite deposits. The intensification of the Mid-Miocene deepest bottom current gave rise to the contourite-forming currents around the Southern Uplift zone in the northern South China Sea, which flow from Hainan Island to the Xisha Trough in a nearly west-to-east direction leading to the contourite deposits developing in the late Mid-Miocene transgressive environment, with multiple slow sea-level fall cycles.
英文关键词	contourites; seismic reflection characteristics; Miocene; Qiongdongnan basin; South China
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000620197000012
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253948
作者单位	[Feng Yangwei; Ren Yan; Zhang Peng] Nanyang Normal Univ, Sch Geog Sci & Tourism, Nanyang 473061, Henan, Peoples R China; [Feng Yangwei] Shandong Univ Sci & Technol, Shandong Key Lab Deposit Mineralizat & Sedimentar, Qingdao 266590, Shandong, Peoples R China; [Feng Yangwei] East China Univ Technol, Sch Earth Sci, Nanchang 330013, Jiangxi, Peoples R China; [Feng Yangwei; Jin Li] PetroJindian Beijing Sci Tech Co Ltd, Beijing 100000, Peoples R China; [Lyu Chengfu] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Chen Ying] CNOOC Res Inst Co Ltd, Beijing 100028, Peoples R China
推荐引用方式 GB/T 7714	Feng Yangwei,Ren Yan,Lyu Chengfu,et al. Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin, Northern South China Sea[J]. 中国科学院西北生态环境资源研究院,2021,95(1).
APA	Feng Yangwei,Ren Yan,Lyu Chengfu,Zhang Peng,Chen Ying,&Jin Li.(2021).Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin, Northern South China Sea.ACTA GEOLOGICA SINICA-ENGLISH EDITION,95(1).
MLA	Feng Yangwei,et al."Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin, Northern South China Sea".ACTA GEOLOGICA SINICA-ENGLISH EDITION 95.1(2021).