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Constraints on the origin of adakites and porphyry Cu-Mo mineralization in Chongjiang, Southern Gangdese, the Tibetan Plateau
Hu, Yong-bin1,2; Liu, Ji-qiang1,3; Ling, Ming-xing4; Liu, Yan5; Ding, Xing4; Liu, Dun-yi5; Sun, Wei-dong6,7,8
2017-11-01
Source PublicationLITHOS
ISSN0024-4937
Volume292Pages:424-436
Corresponding AuthorSun, Wei-dong(weidongsun@gig.ac.cn)
AbstractChongjiang is a low-grade porphyry Cu deposit, located in the Gangdese belt, south Tibet. The petrogenesis and geodynamic settings of the Miocene intrusions associated with the deposit remain controversial. This study presents new results on in situ zircon Hf-O isotopic compositions and U-Pb ages, whole rock major and trace elements, and Sr-Nd isotopes for the adakitic intrusions from Chongjiang deposit. The ore-bearing biotite monzogranite porphyry has adakitic characteristics, with enriched large-ion-lithophile elements (LILE) and light rare earth elements (LREE), and depleted in high-field-strength elements (HFSE), P and Ti. LA-ICP-MS zircon U-Pb dating indicates that the ore-bearing and barren adakites were emplaced at 14.9 +/- 0.3 Ma and 12.9 0.3 Ma, respectively. The porphyry is characterized by relatively high initial Sr-87/Sr-88 ratios (0.7059 to 0.7066), and negative whole-rock epsilon(Nd)(t) values (-3.8 to -2.6). Zircon delta(18)0 is slightly higher than mantle values (5.0 to 7.2 parts per thousand), with varied epsilon(Hf)(t) (-1.0 to 7.6). Most of the in situ zircon Hf-O isotopic data plot in a binary mixing trend between MORB and lower continental crust-derived melts. These results indicate contributions from mixing of a mantle-like source (e.g., slab melts) with continental crust. Interestingly, most of the samples plot in the field defined by Dabie adakites (representing partial melting of the lower continental crust), with several samples near/in the circum-Pacific adakite field (representing partial melting of subducted oceanic slabs), which seemingly indicates that Chongjiang adaldtes mostly formed through partial melting of lower continental crust, with a small amount derived from oceanic slab melts. These may be plausibly explained by plagioclase retention in the thickened Tibetan continental crust, which lowers Sr contents in the magmas during crustal assimilation. Such a model is supported by other adakite discrimination diagrams, which all point towards slab melting. Crustal contamination can compellingly explain the low grade of the Chongjiang deposit. Considering the temporal-spatial distribution of porphyry Cu deposits, geochemical characteristics and high oxygen fugacity, we propose that the subducting Ninetyeast Ridge probably played a critical role in controlling the formation of Miocene adakites and porphyry copper deposits in the eastern Gangdese belt. (C) 2017 Elsevier B.V. All rights reserved.
KeywordPorphyry Cu deposit Adakite Chongjiang Gangdese Ninetyeast Ridge
DOI10.1016/j.lithos.2017.09.012
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600408] ; NSFC[91328204] ; NSFC[41421062] ; Zhejiang Provincial Natural Science Foundation[LZ16D060001]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000416185500028
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157309
Collection深海极端环境与生命过程研究中心
中国科学院海洋研究所
Corresponding AuthorSun, Wei-dong
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 10094, Peoples R China
3.State Ocean Adm, Inst Oceanog 2, SOA Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China
6.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
7.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
8.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hu, Yong-bin,Liu, Ji-qiang,Ling, Ming-xing,et al. Constraints on the origin of adakites and porphyry Cu-Mo mineralization in Chongjiang, Southern Gangdese, the Tibetan Plateau[J]. LITHOS,2017,292:424-436.
APA Hu, Yong-bin.,Liu, Ji-qiang.,Ling, Ming-xing.,Liu, Yan.,Ding, Xing.,...&Sun, Wei-dong.(2017).Constraints on the origin of adakites and porphyry Cu-Mo mineralization in Chongjiang, Southern Gangdese, the Tibetan Plateau.LITHOS,292,424-436.
MLA Hu, Yong-bin,et al."Constraints on the origin of adakites and porphyry Cu-Mo mineralization in Chongjiang, Southern Gangdese, the Tibetan Plateau".LITHOS 292(2017):424-436.
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