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DOI	10.1016/j.precamres.2014.01.009
	Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite
	Cai, Yongfeng; Wang, Yuejun; Cawood, Peter A.; Fan, Weiming; Liu, Huichuan; Xing, Xiaowan; Zhang, Yuzhi
通讯作者	Wang, YJ (通讯作者)
发表日期	2014
ISSN	0301-9268
EISSN	1872-7433
起始页码	13
结束页码	28
卷号	245
英文摘要	Lenses of amphibolites occur along the Ailaoshan suture zone at the southwestern margin of the Yangtze Block, South China. Petrological, geochemical and zircon U-Pb geochronological data indicate that they are divisible into two coeval groups. Group 1, represented by the Jinping amphibolite, has mg-number of 71-76 and (La/Yb)cn ratios of 7.2-7.7, and displays a geochemical affinity to island arc volcanic rocks. Group 2 amphibolites occur at Yuanyang and are characterized by high Nb contents (14.3-18.4 ppm), resembling Nb-enriched basalts. The epsilon(Nd)(t) values for Group 1 range from -3.45 to -2.04 and for Group 2 from +4.08 to +4.39. A representative sample for Group 1 yields a U-Pb zircon age of 803 7 Ma, whereas two samples for Group 2 give U-Pb zircon ages of 813 +/- 11 Ma and 814 +/- 12 Ma. Petrogenetic analysis suggests that Group 1 originated from an orthopyroxene-rich source and Group 2 from a mantle wedge modified by slab-derived melt. In combination with other geological observations, these amphibolites are inferred to constitute part of an early Neoproterozoic (similar to 815-800 Ma) arc-back-arc basin system. The Neoproterozoic amphibolites and related rocks along the Ailaoshan zone may be the southward extension of the Neoproterozoic supra-subduction zone that developed along the western margin of the Yangtze Block. (C) 2014 Elsevier B.V. All rights reserved.
关键词	ZIRCON U-PB BACK-ARC BASIN NORTHWESTERN YANGTZE BLOCK BIMODAL VOLCANIC-ROCKS RIVER SHEAR ZONE A-TYPE GRANITES TECTONIC EVOLUTION CRUSTAL EVOLUTION JIANGNAN OROGEN NORTHERN MARGIN
英文关键词	Ailaoshan zone; Amphibolite; Zircon U-Pb dating; Petrogenesis; Neoproterozoic subduction
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000335107000002
来源期刊	PRECAMBRIAN RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258389
推荐引用方式 GB/T 7714	Cai, Yongfeng,Wang, Yuejun,Cawood, Peter A.,et al. Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite[J]. 中国科学院青藏高原研究所,2014,245.
APA	Cai, Yongfeng.,Wang, Yuejun.,Cawood, Peter A..,Fan, Weiming.,Liu, Huichuan.,...&Zhang, Yuzhi.(2014).Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite.PRECAMBRIAN RESEARCH,245.
MLA	Cai, Yongfeng,et al."Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite".PRECAMBRIAN RESEARCH 245(2014).