Elemental and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag of Jiyang depression, North China  Implications for provenance evolution

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	Elemental and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag of Jiyang depression, North China Implications for provenance evolution
	Cai, GQ (Cai, Guanqiang); Guo, F (Guo, Feng); Liu, XT (Liu, Xiantai); Sui, SL (Sui, Shuling)
刊名	GEOCHEMICAL JOURNAL
	2011
卷号	45 期号:1 页码:33-55
关键词	geochemistry Sr-Nd isotope provenance Dongying Sag Jiyang depression
ISSN号	0016-7002
英文摘要	Major, trace element and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag and the Zhanhua Sag, Jiyang Depression, provide evidence for provenance evolution and paleogeographic reconstruction. Compared with the average composition of post-Archean Australian shales (PAAS), the Paleogene sedimentary rocks of Shahejie formation (Es) from the Dongying Sag have similar SiO(2), Al(2)O(3) contents, lower K(2)O, Na(2)O contents with K(2)O/Na(2)O ranging from 0.18 to 4.58, relatively lower contents of V, Cr, Co, Ni, Nb, Ta, Y, Rb, and Cs, and higher contents of Sr, Ba, Zr and Hf. All samples show chondrite-normalized REE patterns similar to that of PAAS, with significant light REE enrichment, flat heavy REE and negative Eu anomalies (Eu/Eu* = 0.71-0.99, average of 0.80). The Sr-Nd isotopic compositions of the Pale)gene sedimentary rocks are different from those of the Neogene sedimentary rocks which generally have higher (87)Sr/(86)Si and lower (143)Nd/(144)Nd. In the geochemical discrimination diagrams (e.g., La/Th-Hf, La-Th-Sc, and Th-Hf-Co), the studied samples were plotted in the area of felsic rocks rather than mafic rocks, which indicated that the source rocks are mainly composed of post-Archean felsic igneous rocks and recycled sedimentary rocks. This is also supported by interelement ratios such as La/Co, La/Th, Th/Co, and Th/Cr. The Sr-Nd isotopic compositions vary from the Paleogene to Neogene sedimentary rocks further suggesting a change in provenance, during which contemporaneous volcanic lava supplied some clasts with higher (143)Nov (144)Nd and lower (87)Sr/(86)Sr ratios for deposition of Paleogene Es sedimentary rocks, whereas the contribution of volcanic detritus became much less during the Neogene time. The geochemistry of sedimentary rocks from the Jiyang depression possibly implies that the Paleozoic sedimentary rocks covering the old metamorphic crystalline basement rocks may not be totally denuded at the surrounding uplifts and highs during the Paleogenc time.
学科主题	沉积学与沉积岩
WOS关键词	PENNSYLVANIAN-PERMIAN AGE ; RARE-EARTH ELEMENT ; TRACE-ELEMENT ; CRUSTAL EVOLUTION ; MAJOR-ELEMENT ; SILICICLASTIC ROCKS ; VOLCANIC-ROCKS ; BOHAI BASIN ; GEOCHEMISTRY ; SANDSTONES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	GEOCHEMICAL SOC JAPAN
WOS记录号	WOS:000287890800004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39260]
专题	中国地质调查局
作者单位	Geol Sci Res Inst Shengli Oilfield, Dongying 257015, Peoples R China
推荐引用方式 GB/T 7714	Cai, GQ ,Guo, F ,Liu, XT ,et al. Elemental and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag of Jiyang depression, North China Implications for provenance evolution[J]. GEOCHEMICAL JOURNAL,2011,45(1):33-55.
APA	Cai, GQ ,Guo, F ,Liu, XT ,&Sui, SL .(2011).Elemental and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag of Jiyang depression, North China Implications for provenance evolution.GEOCHEMICAL JOURNAL,45(1),33-55.
MLA	Cai, GQ ,et al."Elemental and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag of Jiyang depression, North China Implications for provenance evolution".GEOCHEMICAL JOURNAL 45.1(2011):33-55.