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Fertilizing porphyry Cu deposits through deep crustal hot zone melting
Wan, Bo1,2,3; Deng, Chen1,3; Najafi, Ali4; Hezareh, Mohammad Reza4; Talebian, Morteza4; Dong, Leilei1,3; Chen, Ling1,3; Xiao, Wenjiao1,3
2018-08-01
发表期刊GONDWANA RESEARCH
ISSN1342-937X
卷号60页码:179-185
摘要Porphyry copper deposits are the world's largest source of copper, but their ultimate source and deep process are disputed. We compare the Sr/Y ratios and Nd isotopes of coeval ore-bearing and ore-barren intermediate rocks from collisional and subduction settings to unravel the sourced depth and nature. During the Miocene mineralization epoch in the Iranian plateau, the median Sr/Y ratios and the median epsilon(Nd)(T) values of ore-bearing rocks (56 +/- 38, 1.1 +/- 1.5) are slightly higher than those of the ore-barren rocks (30 +/- 31, -0.3 +/- 2.4), respectively. Such patterns also exist at mineralization epochs during the Miocene collision ill the eastern Gangdese, and the early Cretaceous subduction in Southeast China. These results indicate that all ore-bearing and ore-barren rocks are from the thickened (->1.2 Gpa) juvenile dominated (>70% mantle contribution) lower crust, and the ore bearing rocks are sourced from slightly deeper and more juvenile sources compared to the coeval ore-barren rocks. The subtle geochemical difference but contrasting ore-potentials indicate heterogeneous origins, and the ore-bearing rocks may be related to ore-enriched sources at the lower crust. A deep crustal hot zone with melting at different depths with heterogeneous sources can account for such phenomena. Delamination of a thickened orogenic root induces asthenosphere upwelling and generates abnormal heat flow in the lower crust. The porphyry mineralization is an indication of the balancing between the melting of thickened lower crust and mantle upwelling, which explains the rarity of mineralization compared to the prolonged orogenic magmatism. (C) 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词Porphyry deposits Sr/Y ratio Nd isotope Hot zone Asthenosphere upwelling
DOI10.1016/j.gr.2018.04.006
资助者NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs
关键词[WOS]COPPER-GOLD DEPOSIT ; ZIRCON U-PB ; ARC MAGMAS ; SUBDUCTION ; EVOLUTION ; COLLISION ; ROCKS ; IRAN ; AU ; MINERALIZATION
语种英语
资助项目NSF of China[41390445] ; NSF of China[41672085] ; NSF of China[91755102] ; CAS programs[GJHZ1776] ; CAS programs[2013047]
资助者NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs ; NSF of China ; NSF of China ; CAS programs ; CAS programs
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000454185000010
出版者ELSEVIER SCIENCE BV
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90233
专题岩石圈演化国家重点实验室
通讯作者Wan, Bo
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Geol Survey Iran, Azadi Sq,Meraj Blvd, Tehran, Iran
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GB/T 7714
Wan, Bo,Deng, Chen,Najafi, Ali,et al. Fertilizing porphyry Cu deposits through deep crustal hot zone melting[J]. GONDWANA RESEARCH,2018,60:179-185.
APA Wan, Bo.,Deng, Chen.,Najafi, Ali.,Hezareh, Mohammad Reza.,Talebian, Morteza.,...&Xiao, Wenjiao.(2018).Fertilizing porphyry Cu deposits through deep crustal hot zone melting.GONDWANA RESEARCH,60,179-185.
MLA Wan, Bo,et al."Fertilizing porphyry Cu deposits through deep crustal hot zone melting".GONDWANA RESEARCH 60(2018):179-185.
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