赣西蒙山地区石竹山超大型硅灰石矿床地质特征及找矿意义

Geological Characteristics and Prospecting Significance of the Shizhushan Superlarge Wollastonite Deposit in Mengshan, West Jiangxi Province

江西省新余市石竹山硅灰石矿床硅灰石矿物量5 400余万t,相当于54个大型硅灰石矿床资源量规模,硅灰石矿物含量平均约60%。Ⅱ、Ⅷ号矿体为石竹矿区内主矿体。Ⅱ号矿体走向延伸超过4 800 m,倾向延深超过1300m,平均厚度14.14m,硅灰石平均含量60.86%,矿石类型以硅灰石-石英-方解石型(Ⅱ号矿体)为主。Ⅷ号矿体走向延伸超1 000 m,倾向延深超过600 m;平均厚度14.67 m;硅灰石矿物量600余万吨,硅灰石平均含量61.80%,矿石类型主要为硅灰石-透辉石型。蒙山地区"岩体+碳酸盐岩+构造裂隙+盖层"组合的矽卡岩与矽卡岩化大理岩化蚀变带是寻找硅灰石矿体的重要区域;石竹山—库里一带中深部具有寻找锡铜钨多金属矿的较好潜能。

The Shizhushan superlarge wollastonite deposit in Xinyu of Jiangxi Province contains about 5 400 tons of wollastonite with an average content about 60%.The No.II and VIII orebodies are the main orebodies of the Shuzhushan deposit.The No.II orebody extends more than 4 800 m along its strike and more than 1 300 m towards the trend,with an average thickness about 14.14 m.The major ore type is wollastonite-quartz-calcite(No.II orebody).The No.VIII orebody stretches more than 1 000 m along the strike and 600 m toward its trend,with an average thickness of 14.67 m.The amount of wollastonite in No.VIII orebody is about 600 tons with an average content about 61.80%,and the main ore type being wollastonite-diopside.The“rock mass+carbonate rock+structure fissure+lithocap”assemblage of skarn plus skarnization and marmorization area is the most important exploration target,and this shows a good potential for exploration of tin,copper,and tungsten polymetallic deposits in the depth of the Shizhushan–Kuli area.