胶莱盆地东北缘龙口—土堆金矿区矿床成因及成矿模式研究

胶莱盆地位于牟平—乳山金成矿带，构造岩浆活动频繁，为金矿的形成提供了优越条件，是胶东地区又一重要的金及铜铅锌等多金属成矿区。为探讨该金矿区矿床成因及成矿模式，通过对龙口—土堆金矿及周边金矿床矿化地质特征、成矿地质条件、成矿流体、成矿物质来源进一步探讨矿床成因及成矿模式。研究得出：胶莱盆地东北缘金矿床总体受控于区内北东向的桃村断裂、龙口—土堆断裂、朱吴—崖子左行走滑断裂构造系统及其形成的拉分盆地边缘的铲式滑脱构造系统控制。成矿物质来源于深源岩浆的混合区，含矿流体在向上运移的过程中萃取了荆山群地层中的成矿物质。在（120±10）Ma沿盆缘北东走向的滑脱构造系统及其次级断裂内交代、充填成矿。在酸性流体环境下形成以硅化、绢云母化蚀变为主的黄铁矿化蚀变岩型金矿。提出了胶莱盆地东北缘金矿集区成矿模式。

Study on Genesis and Metallogenic Model of Longkou Tudui Gold Deposit in Northeastern Margin of Jiaolai Basin

Jiaolai Basin is located in the Muping Rushan gold metallogenic belt,with frequent tectonic magmatic activity,which provides excellent conditions for the formation of gold deposits.It is another important gold,copper,lead,zinc and other polymetallic metallogenic area in the Jiaodong area.In order to explore the genesis and metallogenic model of the gold deposits in this gold mining area,the mineralization geological characteristics,metallogenic geological conditions,metallogenic fluids,and metallogenic material sources of the Longkou Tuidui gold deposit and surrounding gold deposits were used to further explore the genesis and metallogenic properties of the deposits mode.The study concludes that the gold deposits in the northeast margin of the Jiaolai Basin are generally controlled by the northeast trending Taocun fault,Longkou Tuiduo fault,Zhuwu Yazi left strike slip fault structure system and the edge of the Lafen basin.The system control of the shovel slippage structure.The ore forming materials originate from the mixed area of deep source magma,and the ore bearing fluid extracts the ore forming materials in the formation of Jingshan Group during the upward migration process.In the (120±10) Ma landslide structure system and its secondary faults along the basin edge northeast trend,it was replaced and filled with mineralization.In an acidic fluid environment,a pyrite type altered rock type gold deposit with silicification and sericite alteration as the main formation is formed.The metallogenic model of gold deposit concentration area in the northeast margin of Jiaolai Basin is proposed.