摘要
通过三年的地质勘查研究,发现了山东焦家矿区深部105吨特大型金矿床,圈定了89个矿体,归并为4个矿体群,其中Ⅰ-1号主矿体沿焦家断裂主裂面分布。焦家矿区共探获金矿资源储量230多吨,成为世界级超大规模金矿床。通过焦家深部金矿床和浅部金矿床对比研究,揭示了新的金矿成矿规律:浅部金矿床和深部金矿床之间为无矿间隔或弱矿化带;金矿床矿体厚大部位在剖面上产于焦家断裂由陡变缓转折点下部;焦家带金矿床构成了沿"一条构造带、二段矿化富集带、三层矿化蚀变带"产出的矿床模式。通过同位素年龄测定,焦家断裂断层泥的K-Ar年龄为131.05～123.53Ma和48.57～41.18Ma,早期指示断裂构造的主要形成期与金矿的主成矿期同步;晚期金矿的同位素年龄略晚于郭家岭花岗岩年龄,略早于崂山花岗岩年龄,位于伟德山花岗岩年龄值高峰段内,说明伟德山花岗岩岩浆活动是导致"焦家式"金矿成矿的直接因素。
Three years of geological exploration found a 105-ton deep oversize gold deposit and defined 89 orebodies in the Jiaojia field,Shandong province. They are classified into four orebody groups,in which the I-1main orebody was found to occur along the major fault surface of the Jiaojia fault. The total reserves of gold in the Jiaojia deposit amounts to 230 ton or so,and made it one of world-class largest gold deposits. Comparison study of gold deposits located at both depth and shallow reveals the law of gold mineralization. The results show that there is no ore-free interval or weak mineralized zones between them and thick gold orebodies occur below the turning point from steep to flat of the Jiaojia fault. Mineralization model of the Jiaojia gold belt is characterized by ＂one tectonic belt,two mineralized enrichment zones and three mineralized alteration zones＂. The K-Ar isotopic ages of the Jiaojia fault are 131.05 - 123.53Ma and 48.57 - 41.18Ma,indicating that the fault formed synchronously as major mineralization. But the age of the gold mineralization,which is later than that of the Guojialin granite but earlier than that of the Laoshan granite,is consistent with the peak values of the Weideshan granite ages,and that indicates that the magmatic activity of Weideshan granite is the direct factor for the mineralization of the Jiaojiao-type gold deposit.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2010年第9期1349-1358,共10页
Acta Geologica Sinica
基金
国家自然科学基金(编号40672139)
山东省地质矿产勘查开发局地矿科技项目资助的成果
作者简介
宋明春，男，1963年生。博士，工程技术应用研究员。主要从事地质矿产勘查研究。通讯地址：250013，山东省济南市历山路74号，山东省地质矿产勘查开发局；电话：0531-86403464；Email：mingchuns@163．com。
