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岔河锡矿位于康滇地轴中段,在成因上与晋宁期(或澄江期)的老花岗岩有关,並与生成时间更早的变基性岩在空间分布上的关系密切。锡矿体产于花岗岩体附近的外接触带,属夕卡岩硫化物型锡矿床。从夕卡岩期到高中温热液期均有锡矿脉的生成,具有多期、多阶段的成矿特征。主要成矿在四期以上,多期矿化重迭就能形成富矿。围岩(前震旦系会理群天宝山组)以性质活泼的碳酸盐类岩石对成矿最为有利,次为变质砂岩、变辉绿岩。有利的成矿构造在多次成矿作用过程中的活动状态主宰着矿体产状、形状、规模和富集程度。与花岗岩体界面大致平行(或小角度相交)的层间滑动面和层间剥离断裂构造,是形成矿体延伸长、厚度大、品位高的最有利构造。就本区锡矿床的产出特征及变化规律,从岩浆岩、地层、构造、近矿围岩蚀变等八个方面作了找矿标志的初步探讨。
The Chahe tin deposit is located in the middle part of the Kang-Dian axis and is genetically related to the old granite in the Jinning Period (or Chengjiang Period). It is closely related to the genesis of the earlier-forming metamorphic rocks. Tin ore production in the granite body near the outer contact zone, is a skarn sulfide tin deposits. The formation of tin ore veins from the skarn stage to the high school warm-liquid period has multi-stage and multi-stage metallogenic characteristics. The main mineralization in more than four, multiple mineralization overlap can form rich ore. Surrounding rock (former Sinian climatic group Tianbaoshan Formation) is characterized by active carbonate rocks that are most favorable for metallogenesis, with secondary metamorphic sandstone and diabase greenstone. Beneficial metallogenic structure in the process of multiple mineralization activities dominate the ore body shape, shape, size and enrichment. The interlaminar sliding surface and interlaminar detachment and fracture structure, which are roughly parallel to (or intersect at a small angle to) the granite body interface, are the most advantageous structures for forming an orebody with an elongated, large thickness and high grade. Based on the characteristics and variation of the output of the tin deposits in this area, preliminary exploration is made on the prospecting signs from eight aspects: magmatic rocks, strata and structures, and alteration of the surrounding rocks of the ore bodies.