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作 者:刘向东 周明岭[1,3] 徐韶辉 尹召凯 徐忠华 刘国栋 范家盟 LIU Xiangdong;ZHOU Mingling;XU Shaohui;YIN Zhaokai;XU Zhonghua;LIU Guodong;FAN Jiameng(Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources,Weihai 264209,Shandong,China;State Key Laboratory of Geological Process and Mineral Resources,China University of Geosciences,Beijing 100083,China;Shandong Provincial Big Data Application and Development Engineering Laboratory of Deep Gold Prospecting,Weihai 264209,Shandong,China)
机构地区:[1]山东省第六地质矿产勘查院,山东威海264209 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [3]山东省深部金矿探测大数据应用开发工程实验室,山东威海264209
出 处:《地质通报》2022年第6期946-957,共12页Geological Bulletin of China
基 金:国家自然科学基金项目NSFC-山东联合基金《胶东深部金矿断裂控矿机理》(批准号:U2006201);山东省重点研发计划《深部金矿资源评价理论、方法与预测》(编号:2017CXGC1604);山东省地质矿产勘查开发局科技攻关项目《胶西北断裂系统及其与金成矿关系》(编号:KY202208)。
摘 要:水旺庄金矿床位于胶西北招平断裂带北段玲珑金矿田东南缘,累计探明金资源量逾180 t,已控制矿体最大垂深2200 m。目前,胶西北主要金矿田深部找矿的深度均已达2000 m,正确认识3000 m深度的找矿前景,既是该区域进一步开展深部找矿的现实需要,也对全国深部找矿具有重要的示范意义。通过对矿床地质特征、矿化富集规律、深部地球物理探测等研究,预测了水旺庄金矿床的深部找矿前景,并进行了深部钻探验证。同时,对区内深部金资源潜力进行了讨论。研究表明,水旺庄金矿床主要矿体严格受控于NNE—NE走向招平断裂带,具有NE向侧伏和SE向倾伏的特征,沿侧伏和倾伏方向金矿化具有分段富集的规律,预测在5号勘探线以东、-2200 m标高以深会出现新的矿化富集区。大地电磁测深剖面显示,招平断裂带向深部延伸稳定,沿倾向具有波状起伏的特征,于-2500~-3000 m标高范围倾角明显变缓,由27°变为18°,指示该区域具有良好的深部找矿前景。根据预测结果,实施了3000.58 m钻孔进行验证,于2831.15~2832.65 m深度探获厚1.50 m、品位达6.85 g/t的金矿体。进一步分析认为,招平断裂带北段深部找矿潜力巨大,初步预测在-2000~-3000 m深度存在第三矿化富集带,预测金资源量可能超400 t。The Shuiwangzhuang gold deposit is located at the southeast segment of the Linglong goldfield,northwestern Jiaodong Peninsula,with a pre-mining endowment more than 180 t of gold.The maximum controlled depth of the orebodies is 2200 m.At present,the prospect depth of main gold fields in the northwestern Jiaodong Peninsula has reached 2000 m,a correct understanding of the prospecting potential at a depth of 3000 m is not only a practical need for further deep prospecting in this region,but also has important demonstration significance for deep prospecting throughout the country.Basing on the research of geological characteristics,mineralization enrichment regularities and deep geophysical probing,deep prospecting potential of the Shuiwangzhuang gold deposit was implemented,and the deep drill hole was constructed to verify its effect.At the same time,the deep gold resources potential is discussed.The main orebodies are controlled by the NEE-to NE-trending Zhaoping fault system,with NE direction of lateral trending and SE direction of plunging.The orebodies segment into a number of enrichment zones along the lateral trending and plunging direction.The orebodies may extend to the east of No.5 exploration line,and below the depth of-2200 m.The MT profile shows that the Zhaoping fault system extend stably to the deep,and the dip angle changes from 27°to 18°at a depth of-2500~-3000 m,indicating good prospecting potential.According to the prospecting results,a 3000.58 m drill hole was constructed,and one gold orebody with thickness of 1.5 m and gold grade of 6.85 g/t was found from 2831.15 m to 2832.65 m.Further analysis shows huge potential of the deep in the northern Zhaoping fault system.It is predicted that there exists a third mineralization enrichment zone at the depth of-2000~-3000 m,and the gold resources may exceed 400 t.
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