开原—崇礼—固阳大断裂两侧超大型金银矿床的预测和探索

PREDICTION AND PROSPECT OF SUPERLARGE SIZE GOLD-SELVER DEPOSITS IN THE SIDES OF KAIYU AN-CHONGLI-GUYANG HUGE FAULT

作者根据对开原—崇礼—固阳大型地体拼贴构造带的区域构造与成矿作用的研究成果,提出此带是超大型贵金属矿床预测的理想场所,并以最新的地质资料论证了该断裂带两侧,尤其是北侧形成超大型矿床的地壳结构的特殊性以及矿源层和含矿岩系等方面的优势条件,特别是沿该构造带分布着十分发育的韧性剪切构造带,认为这些剪切带、糜棱岩化带是地体拼贴碰撞的结果。它导致深部矿源层和含矿的基性火山岩系发生强烈的构造活动,亦导致热液流体系的活跃并最终使韧性剪切带或以含矿石英脉或以蚀变浸染带形式成为容矿构造。根据近年来才兴起的含金剪切带型金矿的成矿理论,分析了该构造成矿带各个有利地段形成超大型矿床的成矿条件,最后指出通过什么途径以及在那些地区寻找超大型矿床。

The prospecting and predicting for precious deposits of big and exceptionally big type possess great economic significance. According to the outcome of sciencetific researches on the huge structure zone of Kaiyuan -chunli -Guyang fault,the author propse the zone is a ideal area for predicting the precious mineral deposits of big and exceptionally big type and argue with new geological materials that the speciality of earth's crust structure and superi ority of source bed ore -bearing rock system,particularly the developing ductile shear struc-ture belts along the both sides of the huge fault zone for forming the presious deposi's espe-cially the northern side of the fault,which is the result of t.errane collage. These iartors led to the structure movement of deep source bed ore -bearing basic volcanic rock and finally led to the activing of thermal fluid and made the ductile shear belts to be host structure in the iorm of gold-bearing quartz vein or ore -bearing alternative belt based on recent years the devel-oping metallogenic theory of ductile shear belt the author in the paper has discussed the ore forming conditions of gold deposits of the exceptionally big type for favourable segments a long the structure zone,and how and where to find them.