Mineralizing Multiformity and Deep Prospecting of Gejiu Super Sn-Cu Multi-Metal Deposit, Yunnan, China
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摘要:
云南个旧超大型锡铜多金属矿床总体表现为以燕山期多次岩浆热液叠加改造为成矿主线, 断裂构造提供导矿通道和储存空间, 岩浆热液作用于个旧组碳酸盐岩、玄武岩, 不同围岩条件以及元素化学性质不同所形成的组合分带造就了成矿多样性, 查明花岗岩体及岩性组合、褶皱与断裂构造、围岩岩性的三维空间分布是找矿预测的关键.高精度重磁结合多功能电法探测揭示岩性界面和赋矿空间, 利用断裂构造原生晕异常特征识别深部隐伏矿床是有效的找矿方法组合, 存在于已系统勘探地区外围的层间氧化矿或脉状矿、岩体与围岩接触带矽卡岩型多金属硫化物矿和岩体内部蚀变岩型锡铜多金属矿是个旧地区今后深部找矿的重要方向.
Abstract:We obtain some new cognitions of mineralizing rule, effective prospecting method and deep forecasting for the Gejiu super Sn-Cu multi-metal deposit of Yunnan Province by systemic research in recent years.Its primary mineralizing process is repeated compound alteration by hot liquid of magma.Conformation afforded transmit alleyway and deposited space for mineralization.The wall rock condition and combination zoniferous character of mineral element lead to mineralizing multiformity.Ascertainment 3D-distributing of granite, drape and faultage conformation and lithology is the key to mineralization forecasting.It proves an effective prospecting method to combine ascertainment lithology interface and deposited roomage by gravity and magnetic survey, and multifunctional electric survey, speedy ascertainment of mineralization abnormity by geochemistry survey of sap, drill and faultage.The future deep prospecting centers around the following three aspects: (1) interbedded oxidation or nervation mineral deposit in the periphery of diggings, (2) Sn-Cu multi-metal deposit in the interface of granite or basalt and marble, (3) Cu-Sn multi-metal deposit in the alterative granite.
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图 1 个旧矿区构造地质略图(据西南有色地勘局308队增补, 2007)
1.辉长二长岩; 2.斑状黑云母花岗岩; 3.等粒状花岗岩; 4.碱性正长岩; 5.变质带; 6.第三系; 7.第四系; 8.法郎组灰岩、白云岩; 9.个旧组白云质灰岩、大理岩; 10.背斜; 11.向斜; 12.断层; 13.矿体分布示意
Fig. 1. Sketch geological map of Gejiu deposit, Yunnan Province, China
图 2 个旧超大型锡铜多金属矿床成矿多样性模式(据西南有色地勘局308队增补, 2007;成矿地质模式据西南有色308队1984年更新; 物性据熊光楚和石盛膝, 1994)
1.个旧组白云质灰岩、大理岩; 2.燕山期花岗岩; 3.断层; 4.褶皱地层; 5.玄武岩; 6.矿体; 7.成矿形式编号; (1) 砂锡矿; (2) 层间氧化矿床; (3) 层间脉状矿床; (4) 电气石细脉型矿床; (5) 矽卡岩型矿床; (6) 玄武岩型矿床; (7) 蚀变岩型矿床.图中成矿地质模式增补了岩体内带蚀变岩型矿床和围岩、矿体的物性参数(η.极化率; ρs.电阻率; σ.密度; J.磁化率)
Fig. 2. Mineralizing multiformity patterm of super Sn-Cu multi-metal deposit, Gejiu, Yunnan Province, China
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