江西宜春-新余地区石竹山超大型硅灰石矿区中多金属矿化矽卡岩的特征、形成年代及其找矿意义
李昌元 , 马盈 , 刘德亮 , 李岩 , 朱振华 , 曾凯 , 袁启玉 , 肖丹
地球科学 ›› 2025, Vol. 50 ›› Issue (08) : 2925 -2936.
江西宜春-新余地区石竹山超大型硅灰石矿区中多金属矿化矽卡岩的特征、形成年代及其找矿意义
Characteristics, Age, and Exploration Significance of Polymetallic Mineralized Skarns in the Super⁃Large Shizhushan Wollastonite Deposit in the Yichun⁃Xinyun Area of Jiangxi Province
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江西石竹山矿床(7 000万吨硅灰石)位于钦杭成矿带东段,是世界上最大的硅灰石矿床. 石竹山矿区中蒙山岩体与围岩碳酸盐岩地层接触带产出的矽卡岩中发育W⁃Sn⁃Cu⁃Mo多金属矿化现象,但其形成时代和成因研究较为薄弱. 基于石竹山矿床中多金属矿化矽卡岩的地质特征,通过对不同类型石榴子石开展原位微区U⁃Pb测年和主微量元素分析,以限定多金属矿化矽卡岩的形成年代,深化对矿床成因的认识,进一步指导找矿勘查. 矽卡岩中发育3种类型的石榴子石,分别为红棕色石榴子石(Grt⁃1),深棕色石榴子石(Grt⁃2)和黄绿色石榴子石(Grt⁃3),3种类型石榴子石均属于钙铁榴石-钙铝榴石固溶体系列,但Grt⁃1和Grt⁃2相对富铁而Grt⁃3相对富铝. Grt⁃2和Grt⁃3的U⁃Pb年龄分别为234.7±1.6 Ma和234.4±9.9 Ma,与矿区内广泛出露的蒙山岩体似斑状黑云母二长花岗岩的年龄一致. 研究表明,石竹山矿床硅灰石矿化和多金属矿化均发生于晚三叠世,二者均与蒙山岩体的岩浆活动具有密切的成因联系,除硅灰石外,石竹山矿区还具有较大的W⁃Sn⁃Cu⁃Mo多金属矿化潜力.
The Shizhushan deposit (70 millions tons of wollastonite) in Jiangxi is situated in the eastern section of the Qin⁃Hang metallogenic belt and is recognized as the largest wollastonite deposit in the world. Within this deposit, W⁃Sn⁃Cu⁃Mo polymetallic mineralization is present in the skarns located in the contact zone between the Mengshan granite and the surrounding carbonate rocks. However, research on the formation age and genesis of this mineralization is relatively limited. This paper conducts in situ U⁃Pb dating and trace element analyses of garnets from different generations to determine the age of formation of the polymetallic mineralized skarns. The findings aim to enhance the understanding of the deposit's genesis and provide further guidance for mineral exploration. Three types of garnets have developed in the skarn: the first type consists of reddish⁃brown garnet (Grt⁃1), the second type comprises dark⁃brown garnet (Grt⁃2), and the third type features yellowish⁃green garnet (Grt⁃3). All three types of garnet belong to the andradite to grossularite solid⁃solution series; however, Grt⁃1 and Grt⁃2 are relatively rich in iron, while Grt⁃3 is relatively rich in aluminum. The U⁃Pb ages of Grt⁃2 and Grt⁃3 are 234.7±1.6 Ma and 234.4±9.9 Ma, respectively, which align with the ages of the biotite monzogranite from the Mengshan complex, widely exposed in the mining area. This study indicates that both wollastonite mineralization and polymetallic mineralization in the Shizhushan deposit occurred during the Late Triassic and are closely associated with the intrusion of the Mengshan granite. In addition to wollastonite, the Shizhushan deposit also holds significant potential for W⁃Sn⁃Cu⁃Mo polymetallic mineralization.
超大型硅灰石矿床 / 多金属矿化 / 找矿意义 / 江西石竹山地区 / 矿物学.
Super⁃large wollastonite deposit / polymetallic mineralization / significance of prospecting / Shizhushan area / Jiangxi Province / mineralogy
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中国地质调查局“江西宜春-新余地区金矿控矿构造和成矿规律研究”(DD20243079)
国家自然科学基金项目(42302087)
博士后创新人才支持计划(BX20230335)
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