胶西北金矿集区构造-岩浆-成矿作用研究—依托于以深反射地震为主的深部探测工程

In recent years, the applicant and his partners had done a series of exploratory researches on the deep tectonic framework and its ore-controlling roles in northwest Jiaodong peninsula gold mineralization concentrated area ( NJG for short) by accurate deep geological spatial data which was obtained from the deep reflection seismic surveys. These results are very rare and precious for the further researches of the tectonization –magmatism –mineralization in this region. Both the existing achievement about the deep reflection seismic section, and the data of previous high precision electrical sounding of detection will be integrated and used in this study. Through the systems work on seismic interpretation, we can obtain accurate deep geological section, and study on the deep geological structure relationship between Sanshandao fault zone, Jiaojia fault zone and Zhaoping fault zone in NJG. The regional magmatic evolution framework will be his work established by systematic mineralogy, geochemistry and chronology researches on the metamorphic rocks of Jiaodong group, the Mesozoic Linglong –Guojialing -Weideshan complexes and the meso-basic dyke rocks. Combined with the study on typical ore deposit, tectonization –magmatism –mineralization mode of NJG will be set up. This project will be helpful to deepen the understanding of the gold metallogenic mechanism, and will be of certain indicating significance for related research and exploration of this kind of deposit in the future.

近年来，申请人及所带团队在胶西北地区探索性地开展了以深反射地震为主要手段的深部构造格架及其控矿作用研究，并取得了精确的胶东地区深部地质体空间分布资料，这对深入研究本区构造-岩浆-成矿作用是十分难得和宝贵的。本次研究拟整合利用依托项目组已有的深反射地震剖面成果，结合利用以往高精度电测深部探测资料，通过进行系统的地震解译，获得准确的深部地学剖面，研究胶西北矿集区三山岛断裂、焦家断裂及招平断裂的深部地质体结构关系；对胶西北地区的胶东群变质岩系、中生代的玲珑、郭家岭、伟德山岩体及中基性脉岩进行系统的矿物学、地球化学、年代学研究，建立区域岩浆演化格架；结合典型矿床研究，建立胶西北地区构造-岩浆-成矿模型。本项目有助于深化对胶西北金矿成矿机制的认识，对今后有关此类矿床的科研和勘探工作有一定的指示意义。

本项目严格按照项目设计的总体思路，完成了项目设计的全部工作任务。精确识别出大型金矿集区超深部控矿地质体结构，破解了该区深部结构关系不明、岩浆-成矿流体运移演化路径不清的科学难题，取得了胶东金矿深部探测的重大突破，为国内外花岗岩区深部探测及资源勘查提供了技术示范。通过对区内的典型岩石、矿物进行系统的矿物学、地球化学、年代学研究，结合典型矿床研究，建立胶西北地区构造-岩浆-成矿模型，建立了板块俯冲挤压引起巨型走滑背景下的巨量金成因模式，首次发现“小位移量超壳走滑断裂”，提出了早白垩世胶东岩浆-流体-巨量金运移受控于垂向超壳走滑断裂系统的新观点；行成了巨量金形成时间集中、垂向成矿流体性质稳定的瞬间爆发成矿新认识；阐明了构造分带特征及演化过程，明确了金矿床（体）赋存规律和深部找矿方向。在此基础上研究预测了深部金矿资源潜力及找矿方向，指导深部找矿工作部署，为今后相似地区的工作提供示范。