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Geochronological and geochemical studies of adakites from Tethyan Belt, Western Pakistan: A clue to geodynamics and Cu-Au mineralization
Mastoi, Abdul Shakoor1,2; Yang, Xiaoyong1; Deng, Jianghong1,3,4; Kashani, Abdul Ghaffar5; Hakro, Asghar A. A. D.2
2019-07-26
Source PublicationINTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
Pages21
Corresponding AuthorYang, Xiaoyong(xyyang555@163.com) ; Deng, Jianghong(jhdeng0507@163.com)
AbstractLarge porphyry Cu-Au deposits are associated with Early Miocene intrusive rocks in Tethyan belt, discovered along Chagai magmatic arc in Western Pakistan, adjacent to Southeast Iran. Two types of rocks were discriminated as granodiorite and monzodiorite from Saindak area. The granodiorites are associated with regional large Cu-Au mineralization, while the monzodiorites are mostly ore-barren. LA-ICP-MS U-Pb dating yielded weighted mean Pb-206/U-238 ages of 22.16-24.2 Ma for granodiorites and ca. 22.6 Ma for a monzodiorite. These intrusive rocks in the Saindak area are all calc-alkaline rocks, with enriched LILEs and depleted HFSEs, and without Eu negative anomalies. The felsic granodiorites are characterized by high Sr contents and Sr/Y ratios, with intermediate to high (La/Yb)(N) ratios that identify them as typical high-silica adakites. In contrast, the basaltic-andesitic monzodiorites are just normal arc-related rocks, showing less fractionated REE patterns than the granodiorites, with systematically lower LREE and higher MREE and HREE. Low K2O/Na2O ratios and decoupled Sr/Y-(La/Yb)(N) ratios indicate the characteristics of slab-derived adakites for the granodiorites, most likely originated through partial melting of the subducted Neotethys oceanic crust beneath Eurasian continent followed by subsequent mantle interaction. The almost simultaneously melting of subcontinental lithospheric mantle induced by dehydration of Neotethys plate gave rise to the formation of the barren monzodiorites. These intrusive rocks in the Saindak area are characterized by similar Sr-Nd-Pb isotopes with high Sr-87/Sr-86(i) ratios, slightly negative epsilon Nd(t) values and radiogenic Pb isotopes, plotting in the field between the MORB and EM-II mantle endmembers or the Average Cadomian Lower Crust, suggesting subducting sediments or old continental crustal materials have contributed into the compositions of these rocks by source enrichment or crustal contamination. The slab-melting derived adakite is favourable for regional massive Cu-Au mineralization in the Saindak area. [GRAPHICS] .
KeywordAdakite slab melting mantle melting Saindak porphyry Cu-Au deposit early miocene neotethys plate subduction
DOI10.1080/00206814.2019.1644677
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41673040] ; National Key R&D Program of China[2016YFC0600404]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000479329700001
PublisherTAYLOR & FRANCIS INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/162400
Collection海洋地质与环境重点实验室
Corresponding AuthorYang, Xiaoyong; Deng, Jianghong
Affiliation1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei, Anhui, Peoples R China
2.Univ Sindh, Ctr Pure & Appl Geol, Jamshoro, Pakistan
3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China
5.Kunming Univ Sci & Technol, Kunming, Yunnan, Peoples R China
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Mastoi, Abdul Shakoor,Yang, Xiaoyong,Deng, Jianghong,et al. Geochronological and geochemical studies of adakites from Tethyan Belt, Western Pakistan: A clue to geodynamics and Cu-Au mineralization[J]. INTERNATIONAL GEOLOGY REVIEW,2019:21.
APA Mastoi, Abdul Shakoor,Yang, Xiaoyong,Deng, Jianghong,Kashani, Abdul Ghaffar,&Hakro, Asghar A. A. D..(2019).Geochronological and geochemical studies of adakites from Tethyan Belt, Western Pakistan: A clue to geodynamics and Cu-Au mineralization.INTERNATIONAL GEOLOGY REVIEW,21.
MLA Mastoi, Abdul Shakoor,et al."Geochronological and geochemical studies of adakites from Tethyan Belt, Western Pakistan: A clue to geodynamics and Cu-Au mineralization".INTERNATIONAL GEOLOGY REVIEW (2019):21.
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