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首页> 外文期刊>Journal of Asian earth sciences >Diagenesis and metallogenetic mechanisms of the Tuanjiegou gold deposit from the Lesser Xing'an Range, NE China: Zircon U-Pb geochronology and Lu-Hf isotopic constraints
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Diagenesis and metallogenetic mechanisms of the Tuanjiegou gold deposit from the Lesser Xing'an Range, NE China: Zircon U-Pb geochronology and Lu-Hf isotopic constraints

机译：中国东北小兴安岭团结街沟金矿床的成岩作用和成矿机理：锆石U-Pb年代学和Lu-Hf同位素约束

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The Tuanjiegou gold deposit is a large-sized breccia-hosted epithermal gold deposit in Heilongjiang Province, eastern China, and was discovered in the late 1950s. The scale and unusual metallogenic setting of this gold deposit have made it the focus of many previous studies. We systematically analyzed ore samples, and volcanic and granitic rocks that are associated with the formation of the deposit by single zircon U-Pb dating, obtaining three distinct concordant groups of U-Pb ages from dacitic pyroclastic rocks and lavas: 119.3 ± 3.3 (n = 2), 113.2 ± 1.1 (n = 13), and 109.1 ± 1.A Ma (n = 8); four groups of concordant U-Pb ages from an ore-bearing granite porphyry: 112.5 ± 2.2 (n = 2), 107.0 ± 1.2 (n = 4), 103.0 ± 0.70 (n = 10), and 99.9 ± 1.1 Ma (n = 4); two groups of concordant U-Pb ages from a pyrite-rich, quartz vein-cemented, brecciated and silicified granite porphyry: 104.23 ±0.51 (n = 16) and 101.3 ± 1.3 Ma (n = 2); and five groups of concordant U-Pb ages from pyrite-rich. quartz vein-cemented, brecciated or chunky ore samples: 139±4 to 144±3 (n = 2), 127±4 (n=1), 113.8 + 2.1 (n = 8), 101.3+3.4 (n = 3), and 91+3Ma (n = 1). Combining the whole-rock and Lu-Hf isotope geochemistry with the geology of the mining area and these new U-Pb dates, we have redefined the ore deposit-related temporal history of the area, with formation age of the magma associated with the Ningyuancun Stage volcanics being 119 ± 1.4 Ma and eruption of the volcanics at 113 ±1.1 Ma. The granodiorite-porphyry and granite porphyry were emplaced at 107.0 ± 1.2 Ma and 103-102 Ma, respectively, with ore deposit formation at 102-100 Ma. The magmato-hydrothermal interaction that formed the deposit was closely related to Late Mesozoic crust-mantle interaction, with the early stage calc-alkaline and high-K calc-alkaline magmatism in this area potentially being derived from interaction between asthenospheric mantle material and the under-plated lower crust. However, the magmas associated with late-stage intrusive calc-alkaline and high-K calc-alkaline magmatism may have been generated during interaction between adakite-like magmas derived from the subduction of an oceanic plate and lower crustal material. Here, we suggest that the fluids that formed this deposit formed by interaction with both early- and late-stage mantle-derived magmas and the lower crust, with subsequent aggregation after significant igneous differentiation. During ore formation, the area was in a back-arc initial (passive) rift and continental margin island arc tectonic environment associated with Late Mesozoic subduction of the Pacific Plate, with metallogenesis occurring during a change in the tectonic environment between the latest Early Cretaceous and the Late Cretaceous,
机译：团结街金矿床是中国东部黑龙江省的大型角砾岩超热金矿床，于1950年代末发现。该金矿床的规模和异常的成矿背景使其成为许多先前研究的重点。我们系统地分析了矿石样品以及与单个锆石U-Pb年代形成的沉积物相关的火山岩和花岗质岩石，从大洋热碎屑碎屑岩和熔岩中获得了三个不同的U-Pb年龄一致组：119.3±3.3（n = 2），113.2±1.1（n = 13）和109.1±1.A Ma（n = 8）;含矿花岗岩斑岩的四组一致的U-Pb年龄：112.5±2.2（n = 2），107.0±1.2（n = 4），103.0±0.70（n = 10）和99.9±1.1 Ma（n = 4）;两组一致的U-Pb年龄分别来自富含黄铁矿，石英脉胶结，角砾和硅化的花岗岩斑岩：104.23±0.51（n = 16）和101.3±1.3 Ma（n = 2）；五组一致的U-Pb年龄来自富黄铁矿。石英脉胶结，角砾状或块状矿石样品：139±4至144±3（n = 2），127±4（n = 1），113.8 + 2.1（n = 8），101.3 + 3.4（n = 3） ，以及91 + 3Ma（n = 1）。将整个岩石和Lu-Hf同位素地球化学与矿区的地质以及这些新的U-Pb日期结合起来，我们重新定义了该地区与矿床有关的时间史，以及与宁远村相关的岩浆形成年龄。阶段火山为119±1.4 Ma，火山喷发为113±1.1 Ma。花岗闪长斑岩和花岗斑岩分别位于107.0±1.2 Ma和103-102 Ma，形成的矿床为102-100 Ma。形成沉积的岩浆-热液相互作用与中生代晚期地幔-幔相互作用密切相关，该地区的早期钙碱性和高K钙碱性岩浆作用可能源于软流圈地幔物质与下垫面的相互作用。底壳。但是，与晚期侵入钙碱岩浆和高K钙碱岩浆作用有关的岩浆可能是在洋洋板块俯冲和下地壳物质衍生的类material石岩浆之间相互作用时产生的。在这里，我们建议形成这种沉积物的流体是通过与早期和晚期地幔衍生的岩浆和下地壳的相互作用而形成的，随后在明显的火成岩分化之后发生聚集。在成矿过程中，该区域处于与太平洋板块晚期中生代俯冲有关的背弧初始（被动）裂谷和大陆边缘岛弧构造环境中，成矿作用发生在最新白垩纪和早白垩世之间的构造环境变化期间。白垩纪晚期

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