Identification of the Ordovician oceanic island basalts and their tectonic significance of the Dabao Formation in southern Qinling  Constraints from geochemistry and geochronology of oceanic island basalt

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	Identification of the Ordovician oceanic island basalts and their tectonic significance of the Dabao Formation in southern Qinling Constraints from geochemistry and geochronology of oceanic island basalt
	Wang, T (Wang Tao); Wang, ZQ (Wang ZongQi); Yan, Z (Yan Zhen); Yan, QR (Yan QuanRen); Zhang, YL (Zhang YingLi); Xiang, ZJ (Xiang ZhongJin)
刊名	ACTA PETROLOGICA SINICA
	2009
卷号	25 期号:12 页码:3241-3250
关键词	Zircon SHRIMP U-Pb dating Basalt blocks Dabao Formation Southern Qinling
ISSN号	1000-0569
英文摘要	The Qinling orogen is divided into northern and southern Qinling tectonic belts by Shangxian-Danfeng tectonic m lange. The Dabao Formation is located in the southern Qinling orogen and is composed of grey and dark grey mudstone, siltstone, silicic slate matrix and chert, limeatone and basalt blocks. The Nengganshang and Mahuangxia basalt blocks are contained within black mudstone matrix in Dabao Formation. Based on geochemical analysis, the Nengganshang and Mahuangxia basalt blocks have similar geochemical characteristics to those of OIB, with high SiO(2) (41. 53% similar to 53. 59%), high TiO(2)( 2. 14% similar to 3. 58%), Fe(2)O(3)(T) (10. 23% similar to 15. 64%), high REE (282. 3 x10(-6)) contents, high Ti/Y (300 similar to 622), Zr/Y (3. 8 similar to 7. 4), and show enrichment light REE [( La/Yb)(N) = 8. 34], weak Eu positive anomaly (Eu* =1. 13 similar to 1. 25), without abnormity in Nb and Ta, and enrichment in Rb, Ba and K. The zircon SHRIMP II U-Pb dating results yielded ages of 446Ma and 455Ma in Nengganshang and Mahuangxia basalt blocks. The data suggests the existence of an ocean basin in south Qinling during Ordovician.
学科主题	火成岩岩石学
WOS关键词	ACCRETIONARY COMPLEX ; OROGENIC BELT ; MAGMA SERIES ; ROCKS ; CHINA ; AREA ; ENVIRONMENTS ; PROVENANCE ; EVOLUTION ; ELEMENTS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000276369900012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39016]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resource, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Wang, T ,Wang, ZQ ,Yan, Z ,et al. Identification of the Ordovician oceanic island basalts and their tectonic significance of the Dabao Formation in southern Qinling Constraints from geochemistry and geochronology of oceanic island basalt[J]. ACTA PETROLOGICA SINICA,2009,25(12):3241-3250.
APA	Wang, T ,Wang, ZQ ,Yan, Z ,Yan, QR ,Zhang, YL ,&Xiang, ZJ .(2009).Identification of the Ordovician oceanic island basalts and their tectonic significance of the Dabao Formation in southern Qinling Constraints from geochemistry and geochronology of oceanic island basalt.ACTA PETROLOGICA SINICA,25(12),3241-3250.
MLA	Wang, T ,et al."Identification of the Ordovician oceanic island basalts and their tectonic significance of the Dabao Formation in southern Qinling Constraints from geochemistry and geochronology of oceanic island basalt".ACTA PETROLOGICA SINICA 25.12(2009):3241-3250.