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    张志辉, 胡擘捷, 张达, 熊光强, 祝新友, 贾文彬, 巩小栋. 2020: 赣北石门寺花岗斑岩锆石U-Pb年龄、岩石地球化学、Hf同位素特征及其对成矿的制约. 地质通报, 39(8): 1267-1284.
    引用本文: 张志辉, 胡擘捷, 张达, 熊光强, 祝新友, 贾文彬, 巩小栋. 2020: 赣北石门寺花岗斑岩锆石U-Pb年龄、岩石地球化学、Hf同位素特征及其对成矿的制约. 地质通报, 39(8): 1267-1284.
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    ZHANG Zhihui, HU Bojie, ZHANG Da, XIONG Guangqiang, ZHU Xinyou, JIA Wenbin, GONG Xiaodong. 2020: Zircon U-Pb age, geochemistry and Hf isotope characteristics of Shimensi granite porphyry in northern Jiangxi Province and its constraint on mineralization. Geological Bulletin of China, 39(8): 1267-1284.
    Citation: ZHANG Zhihui, HU Bojie, ZHANG Da, XIONG Guangqiang, ZHU Xinyou, JIA Wenbin, GONG Xiaodong. 2020: Zircon U-Pb age, geochemistry and Hf isotope characteristics of Shimensi granite porphyry in northern Jiangxi Province and its constraint on mineralization. Geological Bulletin of China, 39(8): 1267-1284.
    shu

    赣北石门寺花岗斑岩锆石U-Pb年龄、岩石地球化学、Hf同位素特征及其对成矿的制约

    Zircon U-Pb age, geochemistry and Hf isotope characteristics of Shimensi granite porphyry in northern Jiangxi Province and its constraint on mineralization

      摘要
    • 摘要: 大湖塘钨矿田石门寺矿段钨多金属矿成矿作用与燕山期花岗质岩浆活动密切相关。其中燕山期花岗斑岩与热液隐爆角砾岩关系密切，是重要的成矿地质体。为研究该岩体成岩时代、岩石成因与演化、形成背景，探讨岩体与成矿的关系，对石门寺花岗斑岩开展了系统的岩相学、岩石化学、锆石U-Pb年龄及Hf同位素研究。结果表明，花岗斑岩形成年龄为154.36±0.83 Ma；花岗斑岩为高硅（SiO2含量为71.90%~76.53%）、过铝质（Al2O3含量为12.76%~14.76%，A/CNK值为1.25~1.39）、高钾钙碱性系列（K2O含量为2.58%~5.42%）岩石；富集大离子亲石元素，亏损高场强元素，稀土元素含量（49.38×10-6~72.36×10-6）较低、LREE/HREE（9.83~16.76）和（La/Yb）N值（16.43~39.45）较高，呈明显负Eu（δEu=0.27~0.65）异常；岩石类型为S型花岗岩。锆石的εHf（t）值为-23.6~-2.9，二阶段模式年龄为1.39~2.70 Ga，表明石门寺花岗斑岩可能为古老地壳部分熔融的产物。岩浆源岩主要为富粘土物质；岩浆演化过程中经历了镁铁质矿物、钛铁矿、斜长石的分离结晶，磷灰石没有发生显著分离结晶作用。结合区内中生代成矿地球动力学背景分析，九岭-鄣公山隆起带存在2期重要的成矿作用：①约150 Ma，由于太平洋板块俯冲汇聚而产生的挤压构造背景下的成岩成矿作用；②约135 Ma以来，处于区域岩石圈伸展减薄背景下的钨多金属成矿作用。

       

      Abstract: The mineralization of tungsten polymetallic ore in the Dahutang tungsten orefield is closely related to the Yanshanian granitic magmatism.The Yanshanian granite porphyry is closely related to the hydrothermal cryptoexplosion breccia and is an important ore-forming geological body in this area.In order to study the rock-forming age, genesis, evolution and formation background of the rock mass as well as to discuss the relationship between the rock mass and mineralization, the authors carried out a systematic study in the aspects of petrology, major and trace elements, zircon U-Pb geochronology and Hf isotope for the Shimensi granite porphyry.The research results show that the rock-forming age of granite porphyry is 154.36±0.83 Ma, the granite porphyry has high-silicon(the content of SiO2 is 71.90%~76.53%), peraluminous nature(the content of Al2O3 being 12.76%~14.76% and the A/CNK value being 1.25~1.39)and thus belongs to high-potassium-calcium-alkaline series(the content of K2O is 2.58%~5.42%).The granite porphyry is enriched in LILEs and depleted in HFSEs.The REE content is low(49.38×10-6~72.36×10-6), LREE/HREE(9.83~16.76)and(La/Yb)N(16.43~39.45)are high, and the granite porphyry has obviously negative δEu anomaly(0.27~0.65).The rock type of granite porphyry is S-type.The εHf(t)values of zircons are -23.6~-2.9 and the two-stage model ages are 1.39~2.70 Ga, indicating that the Shimensi granite porphyry may be a product of partial melting of ancient crust.The source rock magma is mainly clay-rich material.During the evolution of magma, the separation and crystallization of mafic minerals, ilmenite and plagioclase occurred, and no significant separation and crystallization of apatite occurred.Combined with the Mesozoic metallogenic tectonic background in this area, there existed two important mineralization events in the Jiuling-Zhanggongshan uplift zone:one occurred at about 150 Ma, as a result of the diagenetic mineralization under the extrusion tectonic background of the subduction of the Pacific plate; the second occurred at about 135 Ma, as a result of tungsten polymetallic mineralization under the background of the lithosphere stretching thinning.

       

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