四川松潘东北寨微细浸染型金矿床的构造动力成因特征

TECTONO-DYNAMICAL GENETIC CHARACTERISTIC OF DONBELZHAL FINE DISSEMINATED GOLD ORE DEPOSITS IN SONGPAN,SICHUAN PROVINCE

东北寨微细浸染到金矿床的成因，目前有二种说法：一说是矿源层供矿─减压沸腾─非岩浆水（主要为大气降水）热液对流循环成矿；另一说是构造动力作用于岩层和矿源层，引起岩层析水、升温增压，激发元素活化．驱动矿液运移，影响矿质沉淀聚集，在构造的一定部位定位。作者对矿床地质特征、矿床元素地球化学、同位素、稀土元素地球化学、包体测温及成分分析、构造模拟和高温高压实验资料等研究认为，其成因当属后者而非前者。并据矿体分布规律进行成矿预测，提高了钻探命中率，加速了勘探进程，取得了极好的成效，也验证了成矿理论的正确性。

There are still existing some different views on the genesis of Dongbeizhai fine disseminated gold deposits in Songpan, Sichuan Province. One view is that ure materials,pruvided from ore source beds, deposited after boiling due to decreasing pressure and hydrothermal convection and circulation of nonmagmatic water (mainly atmospheric precipitation)and other argues that water seepage occurred as the strata and ore resource beds being suppressed tectono - dynarnically and elements were activated due to increasing temperature and pressure and the ore materials deposited at some locations of structures after hydro- thermal liquid moving, sedimanting and concentrating. Author prefers the latter one based on his studies on deposit geological features, deposit element geochemistry. isotope and rare earth geochemistry, inclusion temperature measuring, compusitional analysis, structural analysis and data analysis of high pressure and high temperature experiments. Accompanied with study on the distribution, auther predicated some new ore bodies with improving drill targeting and speeding up prospecting process. He has obtained great success.