胶东中生代盆地边缘区——大（超大）型金矿的摇篮

胶东中生代盆地边缘区是近年来金矿勘查取得新突破的地区之一，已陆续探明了乳山蓬家夼、西涝口、牟平金庄、宋家沟、海阳郭城、平度大庄子、栖霞西林、笏山、福山杜家崖等中—大（超大）型金矿床。这些金矿床与胶西北蚀变岩型金矿具有同时、同源的特点，但形成于不同的地质空间、不同的围岩条件，构成了一组与中生代燕山晚期岩浆构造活动有成生联系的热液矿床。其成岩、成矿时代介于127.6～105Ma；物质来源具有壳、幔混合源特点，岩浆活动造成围岩中的活化流体及岩浆分离溶出的新生流体萃取花岗岩内部和围岩中的金元素，是重要的成矿因素；金矿床赋存于盆缘断裂系统中，伸展拆离为成矿提供了有利空间；伴随中生代岩石圈减薄、大规模侵入岩（隐伏）侵位产生的热隆伸展构造，形成了盆地边缘独特的蚀变杂岩型金矿。矿床特征与胶西北地区蚀变岩型金矿具有可比性，预示该区具有巨大的找矿潜力。

Marginal Zone of Mesozoic Basin in Jiaodong Area ---The Cradle of Large(Super large)Scale Type Gold Deposits

Marginal zone of Mesozoic basin in Jiaodong area is one of the area where gold deposits prospecting has gained new breakthrough in recent years. Some medium, large and superlarge type gold deposits have been discovered in this area, such as Pengjiakuang gold deposit in Rushan, Xilaokou gold deposit, Jinzhuang gold deposit in Muping, Songjiagou gold deposit, Guocheng gold deposit in Haiyang, Dazhuangzi gold deposit in Pingdu, Xilin gold deposit in Qixia, Hushan gold deposit and Dujiaya gold deposit in Fushan area. These gold deposits have the characteristics of the same period and same source with altered rock type gold deposit in northwest of Jiaodong area. But they were formed in different geological space, different surrounding rock conditions, and formed a group of epithermal deposit which have close contact relation with Mesozoic magmatic tectonic activities in late Yanshan period. Its diagenetic and metallogenic ages are between 127.6~105Ma. Material sources have the characteristics of mixed source with shell and mantle. Magmatic activities caused the extraction of gold elements of activation fluid and new fluid seperated and dissoluted from magma fractional in internal and surrounding rocks of granites. It is important oreforming factors. Gold deposits occurred in fractural system in marginal zone of the basin. Extension and detachment has provided favorable spaces for mineralization. Accompanying with Mesozoic lithosphere thinning, and hot domingextensional structures generated by emplacement of largescale intrusive rocks (hidden) , and formed unique alterated complex type gold deposit in marginal zone of the basin. Deposit characteristics can compare with altered rock type gold deposit in northwest Jiaodong area. It is indicated that there has great ore potentiality in this area.