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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Origin of the Jiaodong-type Xinli gold deposit, Jiaodong Peninsula, China: Constraints from fluid inclusion and C-D-O-S-Sr isotope compositions
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Origin of the Jiaodong-type Xinli gold deposit, Jiaodong Peninsula, China: Constraints from fluid inclusion and C-D-O-S-Sr isotope compositions

机译：胶东半岛胶东型新里金矿床成因：流体包裹体和C-D-O-S-Sr同位素组成的制约

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The Xinli gold deposit within the Sanshandao-Cangshang gold belt in the Jiaodong gold province is a typical "Jiaojia type" ore deposit, with high-grade, quartz-sulfide vein/veinlet stockworks that cut Mesozoic granodiorite. Four ore stages are distinguished in the following sequences: I) quartz-K-feldspar-sericite-pyrite; II) quartz-pyrite; III) quartz-polymetallic sulfide; and IV) quartz-calcite-pyrite. Fluid inclusions in quartz and calcite in the ores contain C-O-H fluids dominantly of six types with varied liquid/vapor ratio. Ore fluid in the main ore stage is characterized by medium-low temperature, low salinity, reducing condition, and NaCl-H2O-CO2 CH4 in composition. The delta O-18(water) (parts per thousand)SMOW of quartz in ore stages II and III range from 2.82 to 5.34%., and the delta D (parts per thousand)smow are between -69.6 and 88.3%o. Both suggest that the ore fluid was dominantly magmatic water. The delta C-13(PDB) of the calcite are from -6.4 parts per thousand to -2.4 cent, indicating mantle contribution to the ore fluid. The pyrite delta S-34(CDT) from four ore stages are basically similar varying from 9.42 to 11.62 parts per thousand, which implies significant involvement of crustal materials. The initial Sr-87/Sr-88 ratios in the calcite ranging from 0.710657 to 0.711542 also denote a crustal contribution. The fluid composition and systematic H-O-C-S-Sr isotopic data are explained by a model of slab-subduction induced gold mineralization. In the model, the ore fluid and metals were considered to associate with the dehydration and desulfidation of the subducting paleo-Pacific slab and the subsequent devolatilization of enriched mantle wedge. The H2O in the fluid might have been released from the devolatilization of enriched mantle wedge; the CO2 could be from mantle wedge or subcontinental lithospheric mantle; and the sulfur and strontium would be initially released from the subducted seafloor sediments. This process was further supported by the geochemical features of intermediate-basic dykes contemporaneous to the gold ore deposits. The deposit features and ore-forming process of the Xinli gold deposit hardly concur those of the orogenic gold deposit and the pluton-related gold deposit. The study supports the argument of that the gold deposits in the Jiaodong belong to a unique gold type related to a complex slab subduction-related process. The geodynamic engine of the Jiaodongtype gold deposit is specific, i.e., the slab subduction coupling with the consequent lithospheric thinning and structure adjustment. (C) 2014 Elsevier B.V. All rights reserved.
机译：胶东金矿三山岛-仓上金矿带内的新里金矿床是典型的“角家型”矿床，具有高级石英硫化物脉/小孔储层，可切割中生代花岗闪长岩。按以下顺序区分四个矿石阶段：I）石英-K-长石-绢云母-黄铁矿; II）石英黄铁矿; III）石英-多金属硫化物; IV）石英方解石黄铁矿。矿石中石英和方解石中的流体包裹体主要含有六种类型的C-O-H流体，它们具有不同的液/气比。主矿阶段的矿液特征为中低温，低盐度，还原条件和组成为NaCl-H2O-CO2 CH4。第二和第三阶段矿石石英的O-18（水）增量（千分之一）SMOW为2.82％至5.34％。，Dδ（水份）弥散度为-69.6％至88.3％o。两者都表明矿石流体主要是岩浆水。方解石的δC-13（PDB）为千分之-6.4至-2.4分，表明地幔对矿石流体的贡献。来自四个矿石阶段的黄铁矿三角洲S-34（CDT）基本相似，范围为千分之9.42至11.62，这暗示着地壳物质的大量参与。方解石中的初始Sr-87 / Sr-88比值介于0.710657至0.711542之间，也表示地壳贡献。流体的成分和系统的H-O-C-S-Sr同位素数据通过平板俯冲诱发的金矿化模型解释。在该模型中，矿石流体和金属被认为与俯冲古太平洋板块的脱水和脱硫以及随后富集的地幔楔的脱挥发分有关。富集地幔楔的脱挥发分可能释放了流体中的H2O;二氧化碳可能来自地幔楔或亚大陆岩石圈地幔;硫和锶将首先从俯冲的海底沉积物中释放出来。与金矿床同时期的中碱性堤坝的地球化学特征进一步支持了这一过程。新里金矿床的矿床特征和成矿过程几乎不能与造山金矿床和与岩体有关的金矿床相一致。该研究支持这样一种论点，即胶东的金矿床属于与平板俯冲有关的复杂过程有关的独特金矿类型。胶东型金矿床的地球动力是特定的，即板块俯冲与岩石圈变薄和结构调整相结合。 （C）2014 Elsevier B.V.保留所有权利。

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