Zircon U-Pb geochronology and geochemistry of Late Cretaceous-early Eocene granodiorites in the southern Gangdese batholith of Tibet: petrogenesis and implications for geodynamics and Cu +/- Au +/- Mo mineralization

doi:10.1080/00206814.2015.1009503

	Zircon U-Pb geochronology and geochemistry of Late Cretaceous-early Eocene granodiorites in the southern Gangdese batholith of Tibet: petrogenesis and implications for geodynamics and Cu +/- Au +/- Mo mineralization
	Jiang, Ziqi 1,2,3; Wang, Qiang 1; Wyman, Derek A.4; Shi, Xiaobin 3; Yang, Jinhui 5; Ma, Lin 1; Gou, Guoning 1
刊名	INTERNATIONAL GEOLOGY REVIEW
	2015-02-17
卷号	57 期号:3 页码:373-392
关键词	adakitic rocks Gangdese belt slab break-off slab melting slab rollback Cu +/- Au +/- Mo mineralization
ISSN号	0020-6814
DOI	10.1080/00206814.2015.1009503
文献子类	Article
英文摘要	Cu +/- Au +/- Mo mineralization is found in multiple intrusive suites in the Gangdese belt of southern Tibet (GBST). However, the petrogenesis of these ore-bearing intrusive rocks remains controversial. Here, we report on mineralization-related Late Cretaceous-early Eocene intrusive rocks in the Chikang-Jirong area, southern Gangdese. Zircon U-Pb analyses indicate that the mainly granodioritic Chikang and Jirong plutons were generated in the Late Cretaceous (ca. 92Ma) and early Eocene (ca. 53Ma), respectively. They are high-K calc-alkaline suites with high SiO2 (64.8-68.3wt.%) and Al2O3 (15.1-15.7wt.%) contents. Chikang granodiorites are characterized by high Sr (835-957ppm), Sr/Y (118-140), Mg# (58-60), Cr (21.8-36.6ppm), and Ni (14.3-22.9ppm), and low Y (6.0-8.1ppm), Yb (0.54-0.68ppm) values with negligible Eu anomalies, which are similar to those of typical slab-derived adakites. The Jirong granodiorites have high SiO2 (64.8-65.3wt.%) and Na2O+K2O (7.19-7.59wt.%), and low CaO (2.45-3.69wt.%) contents, Mg# (47-53) and Sr/Y (14-16) values, along with negative Eu and Ba anomalies. Both Chikang and Jirong granodiorites have similar epsilon(Hf)(t) (7.6-13.1) values. The Chikang granodiorites were most probably produced by partial melting of subducted Neo-Tethyan oceanic crust, and the Jirong granodiorites were possibly generated by partial melting of Gangdese juvenile basaltic crust. In combination with the two peak ages (100-80 and 65-41Ma) of Gangdese magmatism, we suggest that upwelling asthenosphere, triggered by the rollback and subsequent break-off of subducted Neo-Tethyan oceanic lithosphere, provided the heat for partial melting of subducted slab and arc juvenile crust. Taking into account the contemporaneous occurrence of Gangdese magmatism and Cu +/- Au +/- Mo mineralization, we conclude that the Late Cretaceous-early Eocene magmatic rocks in the GBST may have a significant potential for Cu +/- Au +/- Mo mineralization.
WOS关键词	HF ISOTOPIC CONSTRAINTS ; MIDOCEAN RIDGE SUBDUCTION ; PORPHYRY COPPER-DEPOSIT ; MEXICAN VOLCANIC BELT ; THICKENED LOWER CRUST ; CONTINENTAL COLLISION ; INTRUSIVE ROCKS ; LU-HF ; ADAKITIC AFFINITIES ; SOUTHEASTERN TIBET
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000349540100007
资助机构	Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; 41421062 ; 41421062 ; 41202040) ; 41202040) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; 41421062 ; 41421062 ; 41202040) ; 41202040) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; 41421062 ; 41421062 ; 41202040) ; 41202040) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [GIGCAS 135 project](Y234021001) ; 41421062 ; 41421062 ; 41202040) ; 41202040)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86936]
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, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 2.Guilin Univ Technol, Sch Earth Sci, Guilin, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China 4.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Ziqi,Wang, Qiang,Wyman, Derek A.,et al. Zircon U-Pb geochronology and geochemistry of Late Cretaceous-early Eocene granodiorites in the southern Gangdese batholith of Tibet: petrogenesis and implications for geodynamics and Cu +/- Au +/- Mo mineralization[J]. INTERNATIONAL GEOLOGY REVIEW,2015,57(3):373-392.
APA	Jiang, Ziqi.,Wang, Qiang.,Wyman, Derek A..,Shi, Xiaobin.,Yang, Jinhui.,...&Gou, Guoning.(2015).Zircon U-Pb geochronology and geochemistry of Late Cretaceous-early Eocene granodiorites in the southern Gangdese batholith of Tibet: petrogenesis and implications for geodynamics and Cu +/- Au +/- Mo mineralization.INTERNATIONAL GEOLOGY REVIEW,57(3),373-392.
MLA	Jiang, Ziqi,et al."Zircon U-Pb geochronology and geochemistry of Late Cretaceous-early Eocene granodiorites in the southern Gangdese batholith of Tibet: petrogenesis and implications for geodynamics and Cu +/- Au +/- Mo mineralization".INTERNATIONAL GEOLOGY REVIEW 57.3(2015):373-392.