山东沂沭断裂带中段金矿床地质特征及找矿方向

沂沭断裂带内金矿化类型主要为破碎带蚀变岩型金矿床，沂水-汤头断裂及其次级断裂为主要控矿含矿构造，与鲁西地区和燕山期中酸性岩浆岩、古生界碳酸盐岩建造有关的矽卡岩型、浅成热液型金矿床有明显区别。沂沭断裂带内汞丹山凸起区及其边界沂水-汤头断裂、安丘-莒县断裂附近是金成矿的有利位置，开展找矿勘查工作十分必要。对矿区龙泉站矿段主要是控制矿带走向长度、深部延深和查明相对远离主断裂的2条矿带赋矿情况。南小尧、牛家小河金矿床以及龙泉站-司家官庄金矿床的形成说明沂沭断裂带内也具有形成破碎带蚀变岩型金矿床的地质特征。

Geological characteristics of gold deposits in mid Yishu fault zone and prospecting directions

The Au mineralization within Yishu fault zone is fracture-controlled alteration rocks gold deposit, and Yishui-Tangtou fault and its minor fracture is the main ore-controlling structure. The mineralization bares distinctive features from that in west Shandong Peninsula growing with Mesozoic granite and Paleozoic limestone which belongs to the skarn and epithermal gold deposit. It is likely for gold to be mineralized in Gongdanshan Embossment, Yishui-Tan- gtou fault and Anqiu-Juxian fault located in the edge of the Embossment where prospecting work is necessary. What is needed to know more about are the information concerning length and depth of the ore body, and the depositing condi- tions of two ore belts relatively apart from the main fault. With the formation of Nanxiaoyao, Niujiaxiaohe and Longquanzhan-Sijiaguanzhuang ore deposits, it is illustrated that the characteristics of fracture-controlled alteration rocks gold deposit also exist in Yishu fault zone.