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首页> 外文期刊>International Geology Review >Study of late-Mesozoic magmatic rocks and their related copper-gold-polymetallic deposits in the Guichi ore-cluster district, Lower Yangtze River Metallogenic Belt, East China
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Study of late-Mesozoic magmatic rocks and their related copper-gold-polymetallic deposits in the Guichi ore-cluster district, Lower Yangtze River Metallogenic Belt, East China

机译：中国古希矿区矿区岩石岩石及其相关铜金 - 多金属沉积物研究，中国东部大长江矿地区

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摘要

The Guichi ore-cluster district in the Lower Yangtze River Metallogenic Belt hosts extensive Cu-Au-Mo polymetallic deposits including the Tongshan Cu-Mo, Paodaoling Au, Matou Cu-Mo, Anzishan Cu-Mo, Guilinzheng Mo and Zhaceqiao Au deposits, mostly associated with the late Mesozoic magmatic rocks, which has been drawn to attention of study and exploration. However, the metallogenic relationship between magmatic rocks and the Cu-Au-polymetallic deposits is not well constrained. In this study, we report new zircon U-Pb ages, Hf isotopic, and geochemical data for the ore-bearing intrusions of Guichi region. LA-ICP-MS U-Pb ages for the Anzishan quartz diorite porphyrite is 143.9 +/- 1.0Ma. Integrated with previous geochronological data, these late Mesozoic magmatic rocks can be subdivided into two stages of magmatic activities. The first stage (150-132Ma) is characterized by high-K calc-alkaline intrusions closely associated with Cu-Au polymetallic ore deposits. Whereas, the second stage (130-125Ma) produced granites and syenites and is mainly characterized by shoshonite series that are related to Mo-Cu mineralization. The first stage of magmatic rocks is considered to be formed by partial melting of subducted Palaeo-Pacific Plate, assimilated with Yangtze lower crust and remelting Meso-Neoproterozoic crust/sediments. The second stage of magmatism is originated from partial melting of Mesoproterozoic-Neoproterozoic crust, mixed with juvenile crustal materials. The depression cross to the uplift zone of the Jiangnan Ancient Continent forms a gradual transition relation, and the hydrothermal mineralization composite with two stages have certain characteristics along the regional fault (Gaotan Fault). Guichi region results from two episodes of magmatism probably related to tectonic transition from subduction of Palaeo-Pacific Plate to back-arc extensional setting between 150 and 125Ma, which lead to the Mesozoic large-scale polymetallic mineralization events in southeast China.
机译：较低江矿地区的古希奥尔集群区宿主广泛的Cu-Au-Mo多金属沉积物，包括铜山Cu-Mo，Paodaoling Au，Matou Cu-Mo，Anzishan Cu-Mo，桂林中莫和Zhaceqiao Au沉积物，主要是与后期中生代岩石岩有关，已经引起了研究和探索的关注。然而，岩浆岩石和Cu-Au-多种沉积物之间的成矿关系并不受到很大约束。在这项研究中，我们向Guichi地区的矿石入侵报告新的锆石U-PB Ag，HF同位素和地球化学数据。 Anzishan石英Diorite Porphyrite的La-ICP-MS U-PB年龄为143.9 +/- 1.0mA。与以前的地理学系列相结合，这些晚期中生代岩石岩石可以细分为岩浆活动的两个阶段。第一阶段（150-132mA）的特征在于与Cu-Au多金属矿沉积物密切相关的高K钙碱性入侵。而第二阶段（130-125mA）生产的花岗岩和合作，主要是与Mo-Cu矿化有关的舒塞岩系列。岩浆岩石的第一阶段被认为是通过化脓性古地基板的部分熔化形成的，与长江下地壳和重熔间 - 新蛋白古代地壳/沉积物同化。岩浆广告的第二阶段源自中环代奇核 - 新核古代地壳的部分熔化，与少年地壳材料混合。江南古大陆隆起区的凹陷交叉形成逐渐过渡关系，沿着两个阶段的水热矿化复合材料沿着区域断层（高坦断层）具有一定的特征。 Guichi地区由两次岩浆剧集的结果可能与从古地太平洋板的俯冲到150和125mA之间的后弧扩展设置的构造过渡，这导致了中国东南部的中生大规模多金属矿化事件。

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