Geological characteristics and prospecting prospects of the Laowushu skarn-type tin deposit in the Pengshan area, northern Jiangxi
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摘要:
研究目的 老屋舒锡矿床位于赣北地区彭山锡多金属矿集区内的北西部，是近期勘查新发现的矽卡岩型锡矿床。现有勘查工程单孔揭露厚15.77 m、Sn平均品位1.2%的矽卡岩型矿体，沿岩体外接触带顺层产出，是彭山锡多金属矿集区内发现的单工程品位最高、厚度最大的锡矿体，但是其成矿条件和成矿潜力仍不清楚。
研究方法 在总结前人研究成果和勘查工作新发现的基础上，对老屋舒矿床矿体特征和矿石特征进行了综合研究。
研究结果 提出与彭山锡多金属矿集区其他矿区不同，老屋舒矿区矽卡岩型锡矿体主要赋存于荷塘组底部炭质页岩夹白云质灰岩与花岗岩的外接触带。成矿过程分为矽卡岩阶段、氧化物阶段、石英−硫化物阶段3个成矿阶段。
结论 结合岩浆岩、围岩和构造地质特征，对矿区成矿条件进行了综合分析，认为彭山地区老屋舒矽卡岩型锡矿区具有良好的找矿前景。
Abstract:Objective The Laowushu tin deposit is located in the northwest of the Pengshan tin polymetallic ore cluster in northern Jiangxi Province. It is a newly discovered skarn−type tin deposit in recent exploration. The existing exploration project single hole revealed a skarn−type ore body with a thickness of 15.77 m and an average Sn grade of 1.2%. It is produced along the outer contact zone of the rock body. It is the tin ore body with the highest grade and the largest thickness found in the Pengshan tin polymetallic ore cluster. However, its mineralization conditions and mineralization potential are still unclear.
Methods Based on the summary of previous research results and new discoveries in exploration work, this paper conducts a comprehensive study on the ore body characteristics and ore characteristics of the Laowushu deposit.
Results It is proposed that, unlike other mining areas in the Pengshan tin polymetallic ore cluster, the skarn−type tin ore bodies in the Laowushu mining area are mainly distributed in the outer contact zone of carbonaceous shale interbedded with dolomite limestone and granite at the bottom of the Hetang Formation. The mineralization process is divided into three mineralization stages: skarn mineralization stage, oxide mineralization stage, and quartz−sulfide mineralization stage.
Conclusions A comprehensive analysis of the mineralization conditions of the mining area was conducted based on the characteristics of magmatic rocks, surrounding rocks and structural geology, and it is believed that the Laowushu skarn−type tin mining area in Pengshan area has good prospecting prospects.
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表 1 彭山锡多金属矿集区矿产特征
Table 1. Brief table of mineral characteristics in Pengshan tin polymetallic ore cluster area
矿产地 矿种 矿体形态及产状 规模 矿石类型 矿床成因 伴生矿产 曾家垅 锡 层状，顺层产于外接触带陡山沱组白云岩夹层及砂岩 大型 锡石硫化物矽卡岩 热液充填交代、矽卡岩化 锌铜 尖峰坡 锡 层状，顺层产于莲沱组顶部砾岩及陡山沱组顶部白云岩 中型 锡石硫化物砂砾岩 热液充填交代、矽卡岩化 锌铜 垅里甘 锡 细网脉状，产于花岗斑岩两侧厚层硅质岩 中型 含硫化物锡石硅质岩 中温热液充填交代 锌 红花尖 锡 层状，顺层产于莲沱组顶部砾岩 中型 锡石硫化物砂砾岩 高—中温热液充填交代 锌 张十八 铅锌 细脉浸染状，顺层产于莲沱组顶部砂砾岩 中型 闪锌矿、方铅矿砂砾岩 中温热液充填交代 银 老屋舒 锡 似层状，沿接触带产于荷塘组底部灰岩夹层 未知 锡石硫化物矽卡岩 矽卡岩化 铜、萤石 
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表 2 彭山锡多金属矿集区地层
Table 2. Brief table of strata in Pengshan tin polymetallic ore cluster area
界 系 统 地层名称及主要岩性 新生界 第四系 - 残、坡积层(Q) 下古生界 志留系 下统 梨树窝组(S1l)页岩、粉砂质页岩夹砂岩 奥陶系 上统 汤头组(O3tt)瘤状灰岩 中统 汤山组(O2t)旋涡状灰岩 下统 仑山组(Є3-O1l)上段厚层白云岩，下段中厚层白云质灰岩 寒武系 上统 西阳山组(Є3x)细条带状泥质灰岩 华严寺组(Є3hy)薄层状泥质条带状灰岩夹中厚层状灰岩 中统 杨柳岗组(Є2y)宽条带、眼球状泥灰岩、泥质灰岩夹同生角砾岩 下统 观音堂组(Є1g)粉砂岩及粉砂质页岩 荷塘组(Є0-1h)炭质页岩及含炭硅质页岩，底部见白云质灰岩夹层 新元古界 震旦系 上统 灯影组(Z2d)厚层硅质岩，顶部见含炭硅质岩、灰岩 下统 陡山沱组(Z1d)白云岩夹白云质粉砂岩及含炭硅质页岩 南华系 上统 南沱组(Nh3n)凝灰质粉砂岩及含砾凝灰质粉砂岩 下统 莲沱组(Nh1l)含砾石英砂岩、砾岩及长石石英砂岩 青白口系 - 上双桥山群(Pt2sh2)板岩、砂质板岩夹紫色砂质板岩
下双桥山群(Pt2sh1)板岩、砂质板岩夹细碧角斑岩
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