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DOI	10.1007/s13131-020-1628-7
	Geochemistry and zircon U-Pb ages of the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin
	Sun, Rui; Ma, Ming; Zhong, Kai; Wang, Xiayang; Zhao, Zhao; Guo, Shuai; Yao, Xingzong; Zhang, Gongcheng
通讯作者	Zhang, GC (通讯作者)，CNOOC Res Inst Co Ltd, Beijing 100028, Peoples R China.
发表日期	2021
ISSN	0253-505X
EISSN	1869-1099
起始页码	123
结束页码	135
卷号	40 期号:2
英文摘要	In this study, element geochemistry and zircon chronology are used to analyze the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin. The experimental results are discussed with respect to weathering conditions, parent rock lithologies, and provenances. The chemical index of alteration and the chemical index of weathering values of mudstone samples from the lower Oligocene Enping Formation indicate that clastic particles in the study area underwent moderate weathering. Mudstone samples exhibit relatively enriched light rare earth elements and depleted heavy rare earth elements, V-shaped negative Eu anomalies, and negligible Ce anomalies. The rare earth element distribution curves are obviously right-inclined, with shapes and contents similar to those of post-Archean Australian shale and upper continental crust, indicating that the samples originated from acid rocks in the upper crust. The Hf-La/Th and La/Sc-Co/Th diagrams show this same origin for the sediments in the study area. For the samples from the upper Enping deltas, the overall age spectrum shows four major age peaks ca. 59-68 Ma, 98-136 Ma, 153-168 Ma and 239-260 Ma. For the Zhuhai Formation samples, the overall age spectrum shows three major age peaks ca. 149 Ma, 252 Ma and 380 Ma. The detrital zircon shapes and U-Pb ages reveal that during Oligocene sedimentation, the sediments on the northwestern margin of the Baiyun Sag were supplied jointly from two provenances: Precambrian-Paleozoic metamorphic rocks in the extrabasinal South China fold zone and Mesozoic volcanic rocks in the intrabasinal Panyu Low Uplift, and the former supply became stronger through time. Thus, the provenance of the Oligocene deltas experienced a transition from an early proximal intrabasinal source to a late distal extrabasinal source.
关键词	SOUTH CHINA SEA TRACE-ELEMENTS PROVENANCE EVOLUTION PALEOGENE ROCKS CRUST PALEOGEOGRAPHY GEOCHRONOLOGY METASOMATISM
英文关键词	weathering degree; lithology of parent rock; provenance; element geochemistry; zircon U-Pb ages; Baiyun Sag
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000638882700011
来源期刊	ACTA OCEANOLOGICA SINICA
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/255005
作者单位	[Sun, Rui] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China; [Ma, Ming] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Ma, Ming] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Sun, Rui] Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China; [Sun, Rui] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Sun, Rui; Zhao, Zhao; Guo, Shuai; Zhang, Gongcheng] CNOOC Res Inst Co Ltd, Beijing 100028, Peoples R China; [Zhong, Kai] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China; [Wang, Xiayang] PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China; [Yao, Xingzong] Northwest Univ, Dept Geol, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Sun, Rui,Ma, Ming,Zhong, Kai,et al. Geochemistry and zircon U-Pb ages of the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin[J]. 中国科学院西北生态环境资源研究院,2021,40(2).
APA	Sun, Rui.,Ma, Ming.,Zhong, Kai.,Wang, Xiayang.,Zhao, Zhao.,...&Zhang, Gongcheng.(2021).Geochemistry and zircon U-Pb ages of the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin.ACTA OCEANOLOGICA SINICA,40(2).
MLA	Sun, Rui,et al."Geochemistry and zircon U-Pb ages of the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin".ACTA OCEANOLOGICA SINICA 40.2(2021).