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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

文献类型：期刊论文

作者Jiang, Zi-Qi1,2,3; Wang, Qiang1; Li, Zheng-Xiang4,5; Wyman, Derek A.6; Tang, Gong-Jian1,2; Jia, Xiao-Hui1,2; Yang, Yue-Heng7
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2012-07-07
卷号53页码:67-81
关键词Adakite Cu-Au mineralization Slab melting Gangdese arc Tibet
ISSN号1367-9120
DOI10.1016/j.jseaes.2012.02.010
文献子类Article
英文摘要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.
WOS关键词LOWER CONTINENTAL-CRUST ; EAST-WEST EXTENSION ; PORPHYRY COPPER-DEPOSITS ; THICKENED LOWER CRUST ; U-PB GEOCHRONOLOGY ; LU-HF ; TRACE-ELEMENT ; MAGNESIAN ANDESITES ; MANTLE WEDGE ; RIDGE SUBDUCTION
WOS研究方向Geology
语种英语
WOS记录号WOS:000306246700008
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; National Natural, Science Foundation of China(41025006 ; National Natural, Science Foundation of China(41025006 ; GIGCAS(1474) ; GIGCAS(1474) ; ARC Centre of Excellence for Core(413) ; ARC Centre of Excellence for Core(413) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; National Natural, Science Foundation of China(41025006 ; National Natural, Science Foundation of China(41025006 ; GIGCAS(1474) ; GIGCAS(1474) ; ARC Centre of Excellence for Core(413) ; ARC Centre of Excellence for Core(413) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; National Natural, Science Foundation of China(41025006 ; National Natural, Science Foundation of China(41025006 ; GIGCAS(1474) ; GIGCAS(1474) ; ARC Centre of Excellence for Core(413) ; ARC Centre of Excellence for Core(413) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; Major State Basic Research Program of People's Republic of China(2009CB421004) ; National Natural, Science Foundation of China(41025006 ; National Natural, Science Foundation of China(41025006 ; GIGCAS(1474) ; GIGCAS(1474) ; ARC Centre of Excellence for Core(413) ; ARC Centre of Excellence for Core(413) ; 41073029 ; 41073029 ; 41121002) ; 41121002)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84390]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Qiang
作者单位1.Chinese Acad Sci, Ghangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
4.Curtin Univ Technol, Inst Geosci Res TIGeR, Perth, WA 6845, Australia
5.Curtin Univ Technol, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia
6.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
7.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Jiang, Zi-Qi,Wang, Qiang,Li, Zheng-Xiang,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, Zi-Qi.,Wang, Qiang.,Li, Zheng-Xiang.,Wyman, Derek A..,Tang, Gong-Jian.,...&Yang, Yue-Heng.(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, Zi-Qi,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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