胶西北地区水旺庄超大型金矿床深部找矿前景分析探讨

Analysis and Study on Deep Prospecting Potential of Shuiwangzhuang Super Large Gold Deposit in Northwestern Jiaodong Peninsula

水旺庄超大型金矿床为招平金成矿带北段玲珑金矿田东南缘探明的一处超大型金矿床,累计探明金资源量180余吨,②号矿体为该矿床主要矿体,探明金资源量140余吨,占矿区全部金资源量的83%。流体包裹体研究表明,水旺庄金矿床成矿温度200~380℃,成矿压力约60~180 MPa,成矿深度4.4~12 km,而胶东区域整体隆升剥蚀量2~4 km,深部矿体保存良好。黄铁绢英岩化花岗质碎裂岩型矿石为该矿床最主要矿石类型,金品位集中于1~6 g/t,厚度集中于1~10 m,厚度与品位具有一定的正相关性。矿体具有NE向侧伏趋势,沿侧伏方向金品位具有似等间距分布的特征,每隔400~500 m会出现金品位高值区,预测矿体延伸至21号勘查线以东,-2600 m标高附近,29号和37号勘查线间为第5金品位高值区,预测金资源量50 t。

Shuiwangzhuang gold deposit is located at the southeastern Linglong gold field in Zhaoping gold belt.It is a super large gold deposit.The accumulated proven gold resources is over 180t.The main ore body is No.2 orebody with the proven gold resources of 140t,which accounts 83%of the total gold resources.As showed by the study results on fluid inclusions,metallogenic temperature of Shuiwangzhuang gold deposit ranges from 200℃to 380℃,metallogenic pressure ranges from 60MPa to 180MPa,metallogenic depth ranges from 4.4km to 12km,and the overall erosion in Jiaodong area ranges from 2km to 4km.The deep ore body is well preserved.Pyrite sericitized granite breccia is main type of ore in this deposit.Gold grade concentrates in 1~6g/t and a thickness concentrates in 1~10 m.There is a certain positive correlation between thickness and grade.The ore body has a NE trending lateral trend,and the gold grades along the lateral direction have a similar equidistant distribution.High gold grade areas will appear every 400~500m.It is predicated that the ore body will extend to the east of exploration line 21 with a depth of-2200m.