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Early Cretaceous adakitic rocks in the Anqing region, southeastern China: constraints on petrogenesis and metallogenic significance
Xie, Jiancheng1; Wang, Yu1; Li, Quanzhong1; Liu, Jianmin1; Yan, Jun1; Sun, Weidong2,3,4
2018
Source PublicationINTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
Volume60Issue:11-14Pages:1435-1452
Corresponding AuthorXie, Jiancheng(xiejiancheng08@163.com)
AbstractThe Anqing region in Lower Yangtze River metallogenic belt is one of the important Cu polymetal producers in China. The origin of Cu polymetallic deposits in the region is closely related to Early Cretaceous adakitic intrusions. To constrain the petrogenetic and metallogenic significance of the adakitic rocks, a detailed geochronological, geochemical, and Sr-Nd-Pb-Hf isotopic study was performed. The Anqing adakitic rocks (SiO2=57.4-64.2wt.%) consist mainly of quartz monzodiorite, formed at 138.2 +/- 1.7Ma (Mean Standard Weighted Deviation (MSWD)=0.61). They have high MgO, Al2O3, Sr, and low Rb, Y, Yb contents, together with high Sr/Y (50.5-222) and La/Yb (31.9-46.9) ratios. They also show negative whole-rock epsilon(Nd)(t) (-9.8 to -8.5) and zircon epsilon(Hf)(t) (-10.0 to -5.4), and high oxygen fugacity (mainly -17.0 to -8.01) values and radiogenic Pb isotopic compositions with (Pb-206/Pb-204)(i)=17.692-17.884, (Pb-207/Pb-204)(i)=15.413-15.511, and (Pb-208/Pb-204)(i)=37.611-37.943. Coupled with negative Nb-Ta anomalies, low K2O/Na2O ratios (0.39-0.62), and high Mg# values (0.44-0.71), these data suggest the adakitic rocks and associated large-scale Cu-Au mineralization of the Anqing region resulted from partial melting of the high oxidized subducted oceanic crust. Addition of mantle-derived magmas and assimilation of crustal materials during emplacement are also possible.
KeywordAdakite mantle-derived magma slab-derived (adakitic) magmas Cu-Au mineralization Anqing region
DOI10.1080/00206814.2017.1362672
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600404] ; National Natural Science Foundation of China[41373045]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000443879500006
PublisherTAYLOR & FRANCIS INC
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/160269
Collection深海极端环境与生命过程研究中心
Corresponding AuthorXie, Jiancheng
Affiliation1.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China
3.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Guangzhou Inst Geochem, CAS Key Lab Isotope Geochronol & Geochem, Guangzhou, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Xie, Jiancheng,Wang, Yu,Li, Quanzhong,et al. Early Cretaceous adakitic rocks in the Anqing region, southeastern China: constraints on petrogenesis and metallogenic significance[J]. INTERNATIONAL GEOLOGY REVIEW,2018,60(11-14):1435-1452.
APA Xie, Jiancheng,Wang, Yu,Li, Quanzhong,Liu, Jianmin,Yan, Jun,&Sun, Weidong.(2018).Early Cretaceous adakitic rocks in the Anqing region, southeastern China: constraints on petrogenesis and metallogenic significance.INTERNATIONAL GEOLOGY REVIEW,60(11-14),1435-1452.
MLA Xie, Jiancheng,et al."Early Cretaceous adakitic rocks in the Anqing region, southeastern China: constraints on petrogenesis and metallogenic significance".INTERNATIONAL GEOLOGY REVIEW 60.11-14(2018):1435-1452.
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