摘要
该文对夹皮沟金矿区有代表性的两个矿床及一个矿点的含金石英脉,用快中子活化法测定了^(40)Ar/^(39)Ar年龄。其年龄谱都以马鞍形为特征,年龄谱的最低坪年龄可作为石英脉的生成时代。3个数据分别为1824±24Ma、1253±17Ma和203±60Ma。由此认为夹皮沟矿区,金的成矿作用是多阶段的,吕梁期、晋宁期和燕山早期。而金矿的成因主要与吕梁期和晋宁期的变质作用有关,因此夹皮沟金矿可划为变质热液型金矿床。
Age determination using ^(40)Ar/^(39)Ar spectral method was made for three quartz amples collected from he Bajiazi gold deposit in the principal alteration zone and the rdaogou old deposit and the No. 816 ore ccurrence n the NW-trending arc structural zone. The ages etermined are 1824Ma, 1253 Ma and 203Ma respectively. These ta uggest that gold mineralization n the Jiapigou ore district is a polystage one with Luliang period and Jinning period laving he dominant role. After Heroynian orogeny, the original gold was partly mobilized, which owever only led to mall-scale economic enrichment.Based on the emplacement time of quartz eins, the author holds that the Jiapigou old deposit is genetically of metamorphic ydrothermal ype.
出处
《矿床地质》
CAS
CSCD
北大核心
1991年第4期349-358,共10页
Mineral Deposits
