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Oxidation state inherited from the magma source and implications for mineralization: Late Jurassic to Early Cretaceous granitoids, Central Lhasa subterrane, Tibet

文献类型：期刊论文

作者Cao, MingJian1,2; Qin, KeZhang1,3; Li, GuangMing1,3; Evans, Noreen J.2; McInnes, Brent I. A.2; Li, JinXiang3,4; Zhao, JunXing1
刊名MINERALIUM DEPOSITA
出版日期2018-03-01
卷号53期号:3页码:299-309
关键词Oxidation State Magnetic Susceptibility fe3+/fe-total Ratios Zircon Ce4+/Ce3+* Central Lhasa subterrane
ISSN号0026-4598
DOI10.1007/s00126-017-0739-3
文献子类Article
英文摘要Arc magmas are more oxidized than mid-ocean ridge basalts; however, there is continuing debate as to whether this higher oxidation state is inherited from the source magma or developed during late-stage magmatic differentiation processes. Well-constrained Late Jurassic to Early Cretaceous arc-related intermediate to felsic rocks derived from distinct magma sources provide us with a good opportunity to resolve this enigma. A series of granitoids from the western Central Lhasa subterrane were analyzed for whole-rock magnetic susceptibility, Fe2O3/FeO ratios, and trace elements in zircon. Compared to Late Jurassic samples (1.8 +/- 2.0 x 10(-4) emu g(-1) oe(-1), Fe3+/Fe-total = 0.32 +/- 0.07, zircon Ce4+/Ce3+* = 15.0 +/- 13.4), Early Cretaceous rocks show higher whole-rock magnetic susceptibility (5.8 +/- 2.5 x 10(-4) emu g(-1) oe(-1)), Fe3+/Fe-total ratios (0.43 +/- 0.04), and zircon Ce4+/Ce3+* values (23.9 +/- 22.3). In addition, positive correlations among whole-rock magnetic susceptibility, Fe3+/Fe-total ratios, and zircon Ce4+/Ce3+* reveal a slight increase in oxidation state from fO(2) = QFM to NNO in the Late Jurassic to fO(2) = similar to NNO in the Early Cretaceous. Obvious linear correlation between oxidation indices (whole-rock magnetic susceptibility, zircon Ce4+/Ce3+*) and source signatures (zircon epsilon Hf(t), T-DM (C) ages) indicates that the oxidation state was predominantly inherited from the source with only a minor contribution from magmatic differentiation. Thus, the sources for both the Late Jurassic and Early Cretaceous rocks were probably influenced by mantle wedge-derived magma, contributing to the increased fO(2). Compared to ore-forming rocks at giant porphyry Cu deposits, the relatively low oxidation state (QFM to NNO) and negative epsilon Hf(t) (-16 to 0) of the studied granitoids implies relative infertility. However, this study demonstrates two potential fast and effective indices (fO(2) and epsilon Hf(t)) to evaluate the fertility of granitoids for porphyry-style mineralization. In an exploration context for the west Central Lhasa subterrane, features indicative of potential fertility might include more oxidized, positive epsilon Hf(t), young rocks (< 130 Ma).
WOS关键词ZIRCON U-PB ; PORPHYRY CU-MO ; HF ISOTOPE ; REDOX STATE ; METALLOGENIC BELT ; SOUTHERN TIBET ; SOURCE REGIONS ; TRACE-ELEMENT ; GANGDESE BELT ; CENTRAL CHILE
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000425106700001
出版者SPRINGER
资助机构Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Natural Science Foundation of China(41672090 ; Natural Science Foundation of China(41672090 ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; International Postdoctoral Exchange Fellowship Program of China ; International Postdoctoral Exchange Fellowship Program of China ; 41472074) ; 41472074) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Natural Science Foundation of China(41672090 ; Natural Science Foundation of China(41672090 ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; International Postdoctoral Exchange Fellowship Program of China ; International Postdoctoral Exchange Fellowship Program of China ; 41472074) ; 41472074) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Natural Science Foundation of China(41672090 ; Natural Science Foundation of China(41672090 ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; International Postdoctoral Exchange Fellowship Program of China ; International Postdoctoral Exchange Fellowship Program of China ; 41472074) ; 41472074) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Chinese Academy of Sciences Strategic Priority Research Program(XDB03010303) ; Natural Science Foundation of China(41672090 ; Natural Science Foundation of China(41672090 ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; Tibetan Large Deposit Metallogenic Specialization(1212011221073) ; International Postdoctoral Exchange Fellowship Program of China ; International Postdoctoral Exchange Fellowship Program of China ; 41472074) ; 41472074)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82666]  
专题中国科学院地质与地球物理研究所
通讯作者Cao, MingJian
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
2.Curtin Univ, John de Laeter Ctr, TIGeR, Appl Geol, Perth, WA 6945, Australia
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
推荐引用方式
GB/T 7714		 Cao, MingJian,Qin, KeZhang,Li, GuangMing,et al. Oxidation state inherited from the magma source and implications for mineralization: Late Jurassic to Early Cretaceous granitoids, Central Lhasa subterrane, Tibet[J]. MINERALIUM DEPOSITA,2018,53(3):299-309.
APA Cao, MingJian.,Qin, KeZhang.,Li, GuangMing.,Evans, Noreen J..,McInnes, Brent I. A..,...&Zhao, JunXing.(2018).Oxidation state inherited from the magma source and implications for mineralization: Late Jurassic to Early Cretaceous granitoids, Central Lhasa subterrane, Tibet.MINERALIUM DEPOSITA,53(3),299-309.
MLA Cao, MingJian,et al."Oxidation state inherited from the magma source and implications for mineralization: Late Jurassic to Early Cretaceous granitoids, Central Lhasa subterrane, Tibet".MINERALIUM DEPOSITA 53.3(2018):299-309.

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来源：地质与地球物理研究所

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