辽宁小塔子沟金矿床地球化学特征及找矿方向

Geochemical Characteristics and Ore-Searching Targets of the Xiaotazigou Gold Deposit,Liaoning Province

岩石和矿石中的Au含量和稀土元素特征表明，小塔子沟金矿的矿质来源比较复杂，热液流经太古宙变质杂岩和花岗斑岩、闪长玢岩等脉岩时，从中获得金等成矿物质，并且北大山二长花岗岩形成时活化转移的金等成矿物质，也为成矿提供了物质来源。Au／Ag比值和（As＋Sb）-（Cu＋Ph＋Zn）图解显示，北大山二长花岗岩提供了成矿所需热-源，已发现的主要矿体都在该花岗岩南部，距北大山二长花岗岩南1～3km范围是寻找新的平行富矿体的最有利地段。规模最大的l号矿脉，成矿温度变化区问比较宽（160～400℃），流体的盐度（ω（NaCl））变化范围也大（0％～9％），沸腾作用明显；而在规模较小的矿脉中，温度比较高（280～400℃），盐度（ω（NaCl））比较低（〈5％）。

The Au and REE content analysis in rocks and ores show that Au source of the Xiaotazi- gou gold deposit is complicated. Gold and other ore-forming materials were derived when hydrothermal fluids passed through the Archean metamorphic complexes, as well as through some granitic porphyry and diorite porphyrite. They were activated and migrated when the Beidashan granite was emplaced. Au/Ag ratio and the diagram of （As＋Sb） versus （Cu＋Pb＋Zn） show that Beidashan monzonitic granite provided necessary heat for the formation of the deposit. The main ore bodies found up to now are mainly located to the south of the monzonitic granite. The area within 1-3 km south of the Beida- shan monzonitic granite is thought to be the most favorable sites for the search for new parallel and highgrade ore bodies. In the No. 1 lode, the largest one in the area, the ore-forming temperature changes greatly from 160-400℃, and the salinity of the ore fluids also changes greatly （0%-9%） with apparent boiling phenomena while the smaller lodes are of higher temperature（280-400℃ ）and lower salinity （〈5%）.