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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
Cao, MJ (Cao, MingJian)1,2; Qin, KZ (Qin, KeZhang)1,3; Li, GM (Li, GuangMing)1,3; Evans, NJ (Evans, Noreen J.)2; McInnes, BIA (McInnes, Brent I. A.)2; Li, JX (Li, JinXiang)3,4; Zhao, JX (Zhao, JunXing)1
Source PublicationMINERALIUM DEPOSITA
2018-03-01
Volume53Issue:3Pages:299-309
DOI10.1007/s00126-017-0739-3
Abstract

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).

Subject Area地质学
WOS IDWOS:000425106700001
Language英语
Indexed BySCIE
KeywordZircon U-pb Porphyry Cu-mo Hf Isotope Redox State Metallogenic Belt Trace-element Gangdese Belt Ore-deposits Arc Magmas Nd-hf
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
Cooperation Status国际
ISSN0026-4598
Department大陆碰撞与高原隆升重点实验室
PublisherSPRINGER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8717
Collection图书馆
Corresponding AuthorCao, MJ (Cao, MingJian)
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China;
2.[Cao, MingJian; Evans, Noreen J.; McInnes, Brent I. A.] 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.
Recommended Citation
GB/T 7714
Cao, MJ ,Qin, KZ ,Li, GM ,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, MJ .,Qin, KZ .,Li, GM .,Evans, NJ .,McInnes, BIA .,...&Zhao, JX .(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, MJ ,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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