Age and composition of Cu-Au related rocks from the lower Yangtze River belt: Constraints on paleo-Pacific slab roll-back beneath eastern China

doi:10.1016/j.lithos.2014.06.007

	Age and composition of Cu-Au related rocks from the lower Yangtze River belt: Constraints on paleo-Pacific slab roll-back beneath eastern China
	Yang, Yi-Zeng 1,2; Chen, Fukun 1,2; Siebel, Wolfgang 3; Zhang, He 1; Long, Qun 1; He, Jian-Feng 1; Hou, Zhen-Hui 1; Zhu, Xi-Yan 4
刊名	LITHOS
	2014-08-01
卷号	202 页码:331-346
关键词	Adakite Cu-Au deposit Yangtze River belt Pb-Sr-Nd isotopes Zircon age
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.06.007
文献子类	Article
英文摘要	Cu-Au mineralization in the Yangtze River belt is closely related to the formation of adakitic rocks. The origin of these rocks is still controversially discussed. In this study, we report zircon U-Pb ages, major-trace element and Pb-Sr-Nd isotopes of Cu-Au related adakitic rocks from the Anqing and Tongling areas of the lower Yangtze River belt (LYRB). Geochemically, the rocks show similarities to adakites derived from slab melting. Statistical evaluation of existing zircon U-Pb data from the LYRB reveals a protracted magmatic activity from 148 Ma to 106 Ma with peak activity at similar to 139 Ma. Cu-Au related magmatism tends to decrease in age from the southwest (Gan-Hang belt) to the northeast (LYRB). This trend was probably imposed by a roll-back process of the paleo-Pacific plate. The Cu-Au related adakitic rocks in the Gan-Hang belt and the middle and lower Yangtze River belt show systematic variation in geochemical and Pb-Sr-Nd isotopic compositions, pointing to a change in magma composition with time. The rocks have features in common with Cenozoic slab-derived adakites, but have experienced different extents of melt peridotite interaction and complex crustal assimilation processes. AFC modeling shows that input of crustal material increased with time. Combined with the decrease of estimated copper reserves, it is concluded that this records a diminishing influence of slab-derived components during the course of the paleo-Pacific subduction process. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	U-PB AGE ; TRONDHJEMITE-GRANODIORITE TTG ; PORPHYRY COPPER-DEPOSITS ; ADAKITIC INTRUSIVE ROCKS ; SOUTHEAST HUBEI PROVINCE ; HF ISOTOPIC COMPOSITION ; LATE MESOZOIC MAGMATISM ; LOWER CONTINENTAL-CRUST ; NORTHERN DABIE COMPLEX ; VOLCANIC-ROCKS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000340853000021
资助机构	National Natural Science Foundation of China(41090372 ; National Natural Science Foundation of China(41090372 ; Chinese Academy of Sciences(2011T2S39) ; Chinese Academy of Sciences(2011T2S39) ; 41372072) ; 41372072) ; National Natural Science Foundation of China(41090372 ; National Natural Science Foundation of China(41090372 ; Chinese Academy of Sciences(2011T2S39) ; Chinese Academy of Sciences(2011T2S39) ; 41372072) ; 41372072) ; National Natural Science Foundation of China(41090372 ; National Natural Science Foundation of China(41090372 ; Chinese Academy of Sciences(2011T2S39) ; Chinese Academy of Sciences(2011T2S39) ; 41372072) ; 41372072) ; National Natural Science Foundation of China(41090372 ; National Natural Science Foundation of China(41090372 ; Chinese Academy of Sciences(2011T2S39) ; Chinese Academy of Sciences(2011T2S39) ; 41372072) ; 41372072)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85076]
专题	中国科学院地质与地球物理研究所
通讯作者	Chen, Fukun
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 2.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Univ Tubingen, Dept Geosci, D-72074 Tubingen, Germany 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yi-Zeng,Chen, Fukun,Siebel, Wolfgang,et al. Age and composition of Cu-Au related rocks from the lower Yangtze River belt: Constraints on paleo-Pacific slab roll-back beneath eastern China[J]. LITHOS,2014,202:331-346.
APA	Yang, Yi-Zeng.,Chen, Fukun.,Siebel, Wolfgang.,Zhang, He.,Long, Qun.,...&Zhu, Xi-Yan.(2014).Age and composition of Cu-Au related rocks from the lower Yangtze River belt: Constraints on paleo-Pacific slab roll-back beneath eastern China.LITHOS,202,331-346.
MLA	Yang, Yi-Zeng,et al."Age and composition of Cu-Au related rocks from the lower Yangtze River belt: Constraints on paleo-Pacific slab roll-back beneath eastern China".LITHOS 202(2014):331-346.