THE FORMATION MECHANISM OF SHUANGWANG GOLD-BEARING BRECCIA BELT AND THE PROSPECTING TARGET PREDICTION
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摘要: 基于前人的地质资料，结合矿床实际地质情况，对陕西省太白双王金矿床含金角砾岩带的形成机制进行了推演，认为双王含金角砾岩是构造与热液隐爆作用相结合的产物。另外对双王金矿床不同期次角砾岩的含金性、不同标型黄铁矿的含金性及双王金矿床金矿化富集规律等进行了研究和总结，并对双王金矿下一步勘查靶区进行了预测。Abstract: Based on the previous geological data and the practical geological conditions of the deposit, the formation mechanism of the gold-bearing breccia belt in Shuangwang region, Taibai is deducted, which show that the formation of shuangwang gold-bearing breccia is a combination of geological structure and hydrothermal cryptoexplosion. In addition, the gold-bearing feature of breccia in different stages and the different types of pyrite, as well as the gold mineralization enrichment regularity are studied and summarized. Eventually the prospecting target of the next step is predicted in the shuangwang gold deposit.
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图 1 双王金矿区域地质图
1—古道岭组上段：厚层结晶灰岩、白云质灰岩、泥质灰岩夹板岩；2—古道岭组下段：粉砂质绢云母板岩夹泥砂质灰岩；3—王家楞组上段：中厚层结晶灰岩、炭质钙质板岩；4—王家楞组下段上部：钙质砂岩、粉砂岩、绢云母板岩夹结晶灰岩；5—王家楞组下段下部：千枚状板岩夹砂岩、炭质板岩及结晶灰岩；6—印支晚期二长花岗岩；7—印支早期石英二长闪长岩；8—花岗斑岩脉；9—角岩带；10—含金角砾岩体及编号；11—地层产状；12—平移断层及编号；13—性质不明断层；14—矿床及矿化点(Au：金；Cu：铜；Fe：磁铁矿；SFe：黄铁矿；PbZn：铅锌矿)
Figure 1. The geologic map of Shuangwang gold deposit region
图 2 胶结物含量、黄铁矿含量与金含量相关性示意图
1—穿脉KT8矿体CM28/1300标本; 2—穿脉KT8矿体CM36/1330标本
Figure 2. The correlation diagram of cement content, pyrite content and gold content
图 5 双王金矿床深部成矿预测纵投影示意图
Figure 5. Deep metallogenic prediction of the Shuangwang gold deposit in the vertical projection
表 1 不同热液活动阶段主要矿物含金量
Table 1. The gold content of main minerals in different stages of hydrothermal activity
热液阶段 含金量/10-9 钠长石 含铁白云石 黄铁矿 方解石(浅灰色) 方解石(粉红色) 萤石 Ⅰ 16.0/1 16500/1 Ⅱ1 33.6/5 108300/5 Ⅱ2 6000/3 ＜15.4/2 Ⅲ1 7790/6 Ⅲ2 159200/10 Ⅳ ＜13.7/2 7.5/1 Ⅴ 注：表内数据意义为含金量/样品数 
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表 2 各阶段黄铁矿特征
Table 2. The characteristics of all stages of pyrite
阶段 亚阶段 产出位置 晶形 粒径/mm 主要 次要 一般 区间 一般 Ⅰ 交代钠长岩角砾中 立方体[100]和八面体[111]聚形晶 八面体[111]和五角十二面体[210]聚形晶 立方体[100]、八面体[111]和五角十二面体[210]聚形晶它形及草莓状 ＜0.2 0.04~0.07 Ⅱ Ⅱ1 ① 含铁白云石晶体和晶粒中; ② 浸染状产于方解石脉中 五角十二面体[210]聚形晶、五角十二面体、立方体[100] 0.03~2.00 0.1~1.0 Ⅱ2 浸染状产于方解石脉中 立方体[100]、八面体[111]、五角十二面体 0.4~1.5 0.4~1.0 Ⅲ Ⅲ1 脉状 它形晶为主，自形晶次之。自形晶中有立方体[100]单晶，也有立方体[100]、五角十二面体、八面体[111]和五角十二面体[210]聚形晶 0.05~1.00 0.1~0.6 Ⅲ2 ① 充填于含铁白云石裂隙中; ② 呈浸染状充填于角砾间或裂隙中 立方体[100]、八面体[111]、五角十二面体和五角十二面体[210]聚形晶 与Ⅱ阶段相似 与Ⅱ阶段相似
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表 3 不同晶形黄铁矿金含量测定表
Table 3. The gold content of different types of pyrite
黄铁矿晶形 金含量测定结果/% 八面体 0.000 五角十二面体、立方体和八面体聚形晶 0.051 立方体和八面体聚形晶 0.093 五角十二面体和八面体聚形晶 0.146 五角十二面体 0.176
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