湖南省安化县柑子园锑矿地质特征及成矿前景

Geological Characteristics and Metallogenic Potential of Ganziyuan Antimony Deposit in Anhua County,Hunan Province

柑子园锑矿位于雪峰弧形构造带中段南东边缘,成矿区位较优越。连里断裂、水田庄断裂等2条NE向区域性断裂为矿床导矿构造,鹅翅膀向斜旁侧的次级断层为容矿构造。区域主要赋矿地层为早奥陶世桥亭子组中段(O1q2)砂质板岩、板岩,前人研究认为该矿床找矿远景可观。结合土壤剖面测量等地质工作成果,查明了矿区地质特征,从成矿元素的运移富集方面对矿区成矿前景进行了分析。由矿区次生晕异常特征可知,虽然元素异常浓度克拉克值较高,但异常衬度低,变异系数低,表明相关成矿元素虽然在地层中含量较高,但未发生明显的后期运移富集。在此认识的基础上,对矿区2个异常中心进行了工程验证,均未见辉锑矿,且矿脉深部经钻探验证也未见辉锑矿。综合类比成矿带上的同类矿床,认为柑子园锑矿虽然具备了成矿地质条件,但赋矿围岩为奥陶系地层,有别于雪峰弧形构造带上大多数矿床的矿体围岩,且容矿断裂位于相对紧闭的向斜核部附近,不利于成矿。综合研究认为,柑子园锑矿成矿前景有限,不宜进行大规模勘查及开发。

Ganziyuan antimony deposit is located in the southwest of the middle part of Xuefeng Arc Structural Belt,and it is located near the intersection of Tongdao-Anhua major faults and Chenzhou-Shaoyang major faults,for a good metallogenic location. The regional NE trending faults（ Lianli fault and Shuitianzhuang fault） are the passable structures of Ganziyuan antimony deposit,the secondary fault located inside Echibang syncline is the ore-hosting structure. The slate and sandy slate in the middle section of Ordovician system Qiaotingzi Group are the main ore-hosting strata,some related study results show that the metallogenic potential of the mining area is favorable. In order to discuss the metallogenic potential of the mining area,the soil profile survey work is conducted in the mining area,so as to analyze the geological characteristics of the mining area,and study the metallogenic potential of the mining area from the the aspects of the migration and enrichment of metallogenic elements. The analysis results of the abnormal characteristics of secondary halo show that although the clark value of element anomaly concentration is high,the anomaly contrast value and variable coefficient are both low,which show that the contents of metallogenic elements in strata in the mining are high,but the the post-migration enrichment of the metallogenic elements are not obvious. Based on the above analysis results of this paper,the engineering verification of the two anomaly centers in the mining area are conducted,but the stibnite are not found,but the stibnite is not found in the depth of ore veins by drilling verification. The Ganziyuan antimony deposit and its similar deposits are conducted synthetic comparative analysis,the results show that although the metallogenic geological condition of the Ganziyuan antimony deposit is favorable,the ore-hosting surrounding rock is Ordovician strata,which is consistent with he ones of the most deposits in Xuefeng Arc Structural Belt,besides that,the ore-hosting fault is located near the relatively closed synclinal core,which is not good for metallogenic. The synthetic study results show that the metallogenic potential of the Ganziyuan antimony deposit is limited,which is not suitable for large-scale exploration and development.