K-Ar DATING OF FAULT GOUGE FROM THE MAIN FAULT OF WULONGGOU GOLD DEPOSIT IN DULAN, QINGHAI PROVINCE
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摘要: 应用K-Ar法对青海省都兰县五龙沟金矿主断裂带内的3个断层泥样品进行同位素测定，以确定该脆性断裂的活动时代，初步探讨该段脆性断裂与成矿之间的关系。测试得到的断层泥样品中自生伊利石的年龄为（185.54±3.06）~（165.11±3.28）Ma，表明该矿床内的脆性断裂活动时代为早侏罗世晚期—中侏罗世，结合野外地质情况，推测脆性断裂的活动对成矿起到了改造和破坏的作用。Abstract: In this paper, K-Ar dating of three fault gouge samples from the main fault belt in Wulonggou gold ore in Dulan, Qinghai Province were made to determine the activity time of the brittle fault. Then the relationship between the main fault and mineralization was discussed. The age of self-generated illite within the fault gouge samples is 185.54±3.06 to 165.11±3.28 Ma, which represents the formation epoch of the main fault being the late of Early Jurassic to Middle Jurassic. Combining with the field geological condition, it is suggested that main fault damaged and modified mineralization in the late of Early Jurassic to Middle Jurassic.
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Key words:
- K-Ar dating /
- fault gouge /
- Wulonggou gold deposit /
- Qinghai Province
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图 1 东昆仑构造图（据许志琴等，2007修改）
1—古—中元古代变质基底；2—震旦—寒武纪浅变质岩；3—早古生代浅变质岩；4—泥盆纪陆相磨拉石及火山岩；5—晚古生代—三叠纪海相沉积；6—中—新生代沉积；7—花岗岩；8—逆冲断裂；9—断裂；10—不整合；QDM—柴达木盆地；TRM—塔里木盆地；N.EKL—东昆仑北地体；S.EKL—东昆仑南地体；BY-SG—巴颜喀拉—松潘甘孜地体；N.EKL F.—东昆仑北缘逆冲断裂；CKL F.—昆中断裂；SKL-ANMQ F.—昆南—阿尼玛卿断裂
Figure 1. Structure map of East Kunlun Mountain
图 2 五龙沟矿区地质简图（据文献[11]修改）
1—第四系；2—新元古界青白口系变火山岩组；3—新元古界青白口系丘吉东沟组；4—晚元古代侵入岩-肉红色中细粒花岗岩；5—早泥盆纪侵入岩-灰黑色中粗粒二长花岗岩；6—晚志留纪侵入岩-灰黑色中粗粒二长花岗岩；7—钾长花岗岩；8—断层；9—地层产状；10—采样点
Figure 2. The geologic map of Wulonggou gold deposit
图 3 五龙沟金矿主断裂带野外照片
a—主断面野外特征；b—构造角砾岩; c—断面上的擦痕；d—黑色含矿断层泥；e—断层泥化带；f—灰白色无矿断层泥; g—断层带内的黄铁矿化; h—断层带内发育的孔雀石化
Figure 3. The photos of the main fault in Wulonggou gold deposit
表 1 五龙沟金矿主断裂带断层泥K-Ar测年数据
Table 1. The K-Ar dating result of fault gouges from the main fault in Wulonggou gold deposit
表 2 五龙沟金矿主断裂带断层泥组成
Table 2. The composition of fault gouges from the main fault in Wulonggou gold deposit
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