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Miocene porphyry copper deposits in the Eastern Tethyan orogenic belt: Using Sr, O isotopes and Sr/Y ratios to predict the source of ore-related and ore-barren magmas
Deng, Chen1,2; Wan, Bo1,2,3; Dong, Leilei1; Talebian, Morteza4; Windley, Brian F.5; Dadashzadeh, Hooman4; Mohammadi, Behzad4; Barati, Behzad4
2018-10-01
发表期刊GONDWANA RESEARCH
ISSN1342-937X
卷号62页码:14-26
摘要There are many Miocene collision- and subduction-related porphyry Cu deposits in the Eastern Tethyan orogenic belt. However, the petrogenesis of the ore-related magmas and the mechanism of metal enrichment remain controversial. Here, we present a geochemical study and comparison of the major Miocene ore-related porphyries and coeval ore-barren magmatic rocks in the Urumieh-Dokhtar magmatic arc in Iran and the Chagai belt in Pakistan, and the Eastern Gangdese belt of the Himalaya. The results show that ore-related porphyries are characterized by relatively depleted mean Sr isotopic compositions (0.704217-0.706859 in the Urumieh-Dokhtar magmatic arc; 0.705052-0.706588 in the Eastern Gangdese belt; 0.705252-0.706708 in the Chagai belt), but higher maximum Sr/Y ratios (40-149 in Urumieh-Dokhtar; 79-178 in Eastern Gangdese; 52-178 in Chagai). In contrast, the coeval ore-barren magmatic rocks yield relatively enriched, mean Sr isotopic compositions (0.704722-0.707653 in Urumieh-Dokhtar; 0.704701-0.707802 in Eastern Gangdese; 0.705982-0.707856 in Chagai), but lower maximum Sr/Y (2-88 in Urumieh-Dokhtar; 61-136 in Eastern Gangdese; and 19-35 in Chagai). A deep crustal hot zone model provides a robust explanation of these data. Melts derived from a deeper melt source in juvenile mafic lower crust, where mantle-derived materials are common, have a greater potential to yield a higher tonnage of metallic Cu, such as the Sar-Cheshmeh deposit in Iran, which is derived from a deep melt zone, and characterized by a low radioactive mean Sr isotopic value of 0.704851, but a huge tonnage of metallic Cu of 7.2 Mt and a high maximum Sr/Y value of 117 (representative of a deeper depth of the melt zone), whereas the Dalli deposit in Iran derived from a relatively shallow melt zone has a more radioactive mean Sr isotopic value of 0.706859, but a smaller amount of metallic Cu of 0.04 Mt and a lower maximum Sr/Y ratio of 40. Conversely, re-melting the contact between newly-formed and pre-existing crust where mantle-derived materials are absent will produce ore-barren rocks. Additionally, the ore-barren rocks with low Sr/Y ratios (<20) should be derived from a shallower melt zone in the crust. (C) 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词Sr, O isotopes Sr/Y ratios Deep crustal hot zone model Eastern Tethyan belt Urumieh-Dokhtar magmatic arc
DOI10.1016/j.gr.2018.03.007
资助者CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China
关键词[WOS]ZIRCON U-PB ; ARABIA-EURASIA COLLISION ; CONTINENTAL-CRUST ; IRAN IMPLICATIONS ; GEODYNAMIC EVOLUTION ; CU MINERALIZATION ; WORKING REFERENCE ; VOLCANIC-ROCKS ; SOUTH TIBET ; ARC MAGMAS
语种英语
资助项目CAS[GJHZ1776] ; CAS[2013047] ; NSF of China[41380945] ; NSF of China[41672085] ; NSF of China[41320104004]
资助者CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China ; CAS ; CAS ; NSF of China ; NSF of China
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000454185200003
出版者ELSEVIER SCIENCE BV
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90247
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Geol Survey Iran, Azadi Sq,Meraj Blvd, Tehran, Iran
5.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
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GB/T 7714
Deng, Chen,Wan, Bo,Dong, Leilei,et al. Miocene porphyry copper deposits in the Eastern Tethyan orogenic belt: Using Sr, O isotopes and Sr/Y ratios to predict the source of ore-related and ore-barren magmas[J]. GONDWANA RESEARCH,2018,62:14-26.
APA Deng, Chen.,Wan, Bo.,Dong, Leilei.,Talebian, Morteza.,Windley, Brian F..,...&Barati, Behzad.(2018).Miocene porphyry copper deposits in the Eastern Tethyan orogenic belt: Using Sr, O isotopes and Sr/Y ratios to predict the source of ore-related and ore-barren magmas.GONDWANA RESEARCH,62,14-26.
MLA Deng, Chen,et al."Miocene porphyry copper deposits in the Eastern Tethyan orogenic belt: Using Sr, O isotopes and Sr/Y ratios to predict the source of ore-related and ore-barren magmas".GONDWANA RESEARCH 62(2018):14-26.
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