综合物探技术在三山岛断裂带与焦家断裂带深部成矿模式中的应用

Analysis on Ore-forming Model in Deep Part of Jijia Gold Deposit in Sanshandao by Using Integrated Geophysical Exploration Method

摘要:

焦家断裂带与三山岛断裂带，是胶东西北部著名的金矿成矿带。利用综合物探资料，对三山岛断裂与焦家断裂带之间与金成矿关系密切的早前寒武纪变质岩系和中生代花岗岩的空间分布关系进行了重新划分。利用高磁、重力、大地电磁（MT）和可控源音频大地电磁（CSAMT）综合研究剖面，研究探索焦家断裂与三山岛断裂带深部断裂构造的分布关系及成矿模式。系统总结了两带金矿地球物理特征及成矿规律和找矿标志，并进行了深部成矿预测，提出了6处深部成矿靶区。其中Au4预测靶区，深孔验证见到厚大金矿体，取得了良好的地质科研效果，为胶西北地区深部地质找矿方向提供了重要依据。

Abstract:

Jiaojia fault belt and Sanshandao fault belt are well known gold mineralization belts in northwestern Jiaodong belt. By using integrated geophysical information, metamorphic rocks in the early Precambrian which have close relation with gold mineralization between Sanshandao fault belt and Jiaojia fault belt, and spatial distribution of Mesozoic granites have been classified again. By using high magnetic, gravity, magnetotelluric (MT) and controlled source audio magnetotelluric (APPLICATION OF CSAMT) profile, distribution relationship and oreforming modle of fault structures in the deep part of Jiaojia fault belt and Sanshandao fault belt have been studied. Geophysical characteristics, oreforming rules and prospecting signs of these two belts have been summarized, deep mineralization have been predicated, and 6 deep mineralization target areas have been circled. Among them, Au4 forecasting target area has seen thick gold ore bodies by the deep hole test, gained good geological research achievements, and provide an important basis for deep geological prospecting in deep part of northwestern Jiaozhou area.