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Late Cretaceous (ca. 90 Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu-Au mineralization
Jiang, ZQ; Wang, Q; Li, ZX; Wyman, DA; Tang, GJ; Jia, XH; Yang, YH; wqiang@gig.ac.cn
2012
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号53页码:67-81
摘要The Gangdese Belt in southern Tibet (GBST) is a major Cu-Au-Mo mineralization zone that mostly formed after the India-Asia collision in association with the small-volume, though widespread, Miocene (18-10 Ma) adakitic porphyries. Cu-Au mineralization has scarcely been found in the regional Jurassic-Early Tertiary batholiths related to subduction of the Neo-Tethyan oceanic plate. Here, we report petrological, zircon geochronological and geochemical data for Late Cretaceous (similar to 90 Ma) intrusive rocks that contain Cu-Au mineralization from the Kelu area in the GBST. These rocks consist of quartz monzonites and diorites. The quartz monzonites, with SiO2 of 58-59 wt.% and Na2O/K2O of 1.1-1.2, are geochemically similar to slab-derived adakites characterized by apparent depletions in heavy rare earth elements (e.g., Yb = 1.4-1.5 ppm) and Y (16-18 ppm) contents, positive Sr but negative Nb and Ti anomalies on multi-element variation diagrams. They have relatively low (Sr-87/Sr-86)(i) (0.7038-0.7039) ratios and high epsilon(Nd)(t) (+3.4 to +3.9) and in situ zircon epsilon(Hf)(t) (+9.3 to +15.8) values. The diorites exhibit high Mg-numbers (0.57-0.61) similar to those of magnesian andesites, and have (Sr-87/Sr-86)(i) (0.7040-0.7041) and epsilon(Nd)(t) (+3.0 to +4.4) values similar to those of the quartz monzonites. We suggest that the quartz monzonitic magmas were most likely generated by partial melting of the subducted Neo-Tethyan basaltic oceanic crust and minor associated oceanic sediments, with subsequent melt-mantle interaction, and the dioritic magmas were mainly derived by the interaction between slab melts and mantle wedge peridotites, with fractionation of apatite and hornblende. These slab-derived adakitic magmas have high oxygen fugacity that may have facilitated Cu-Au mineralization. The close association of the Late Cretaceous adakitic intrusive rocks and Cu-Au mineralization in the Kelu area suggests that the arc magmatic rocks in the GBST may have higher potential than previously thought for Cu-Au mineralization. (C) 2012 Elsevier Ltd. All rights reserved.
部门归属[Jiang, Zi-Qi; Wang, Qiang; Tang, Gong-Jian; Jia, Xiao-Hui] Chinese Acad Sci, Ghangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China; [Jiang, Zi-Qi; Tang, Gong-Jian; Jia, Xiao-Hui] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China; [Jiang, Zi-Qi] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Li, Zheng-Xiang] Curtin Univ Technol, Inst Geosci Res TIGeR, Perth, WA 6845, Australia; [Li, Zheng-Xiang] Curtin Univ Technol, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia; [Wyman, Derek A.] Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia; [Yang, Yue-Heng] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
关键词Adakite Cu-au Mineralization Slab Melting Gangdese Arc Tibet
学科领域Geosciences, Multidisciplinary
语种英语
资助项目海洋地质
WOS记录号WOS:000306246700008
引用统计
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10327
专题中科院边缘海地质重点实验室
通讯作者wqiang@gig.ac.cn
推荐引用方式
GB/T 7714
Jiang, ZQ,Wang, Q,Li, ZX,et al. Late Cretaceous (ca. 90 Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu-Au mineralization[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,53:67-81.
APA Jiang, ZQ.,Wang, Q.,Li, ZX.,Wyman, DA.,Tang, GJ.,...&wqiang@gig.ac.cn.(2012).Late Cretaceous (ca. 90 Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu-Au mineralization.JOURNAL OF ASIAN EARTH SCIENCES,53,67-81.
MLA Jiang, ZQ,et al."Late Cretaceous (ca. 90 Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu-Au mineralization".JOURNAL OF ASIAN EARTH SCIENCES 53(2012):67-81.
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