| 青海五龙沟金矿田两种控矿构造识别及其找矿意义 |
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| 引用本文： | 陈柏林,邓元良,陈建林,张延林,王永,张昊,王铜,韩玉.青海五龙沟金矿田两种控矿构造识别及其找矿意义[J].大地构造与成矿学,2016(2):224-236. |
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| 作者姓名： | 陈柏林 邓元良 陈建林 张延林 王永 张昊 王铜 韩玉 |
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| 作者单位： | 1. 中国地质科学院地质力学研究所,北京,100081;2. 青海省第一地质矿产勘查院,青海平安,810600 |
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| 基金项目： | 中国地质调查局地质矿产调查专项(12120113096000)资助。 |
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| 摘 要： | 五龙沟金矿田位于东昆仑造山带中段,区内金矿床主要受岩金沟、萤石沟-红旗沟、三道梁-苦水泉三条含金构造破碎带控制。本文对这三条含矿构造带不同区段,通过对比断裂构造在几何特征、赋存地层岩石、主要蚀变类型、蚀变矿物组合、蚀变黄铁矿粒度等方面的差异,结合金矿化富集程度,识别出两种不同的控矿构造系统:一是以线性断裂构造带为特征的金矿控矿构造系统;二是与富含浸染状黄铁矿花岗杂岩体侵位有关、以多方向裂隙为特征的多金属矿床控矿构造系统。根据两种不同的控矿构造系统在矿田内的展布,结合相关蚀变特点,提出金矿田范围内金矿的进一步找矿方向是岩金沟带中段和南东段、萤石沟-红旗沟带水闸西沟-黄铁矿沟一线以东、三道梁-苦水泉带中西段;而岩金沟带北西段、萤石沟-红旗沟带水闸西沟-黄铁矿沟一线及其以西、三道梁-苦水泉带东段则是寻找多金属矿的有利部分,而不会形成有规模的金矿化。该找矿新思路在龙潭沟一带2014年度找矿实践中得到初步验证。
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| 关 键 词： | 两种控矿构造系统 金矿化 多金属矿化 金矿找矿方向 五龙沟金矿田 |
Two Ore-controlling Structure Systems in Wulonggou Gold Orefield,Qinghai Province and its Expecting Significance |
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| Abstract: | The Wulonggou gold orefield is located in the middle part of the eastern Kunlun orogenic belt. Gold deposits in the area are controlled by three gold-bearing structural fracture zones (Yanjin’gou zone, Yinshigou-Hongqigou zone and Sandaoliang-Kushuiquan zone). Two kinds of ore-controlling structure system in the gold orefield are recognized on the basis of detailed investigation of ore-controlling fault structure, particularly comparison of the geometrical features, host rocks, alteration type, assemblage of altered mineral and grain size of altered pyrite, as well as the enrichment of gold in different parts of the three gold-bearing structural fracture zones. One of the ore-controlling structure system of gold deposit is featureed as linear fault structure zone. The other is featured as multi-trend fracture and disseminated pyrite-rich granitic complex. According to the distribution of the two kinds of ore-controlling structure system and the characteristics of mineralization-alteration, the further prospecting for gold deposit in the area is promising in the middle and southeastern part of the Yanjin’gou zone, the east of the line from Shuizhaxigou to Huangtiekuanggou in the Yinshigou-Hongqigou zone, and the middle and western part of the Sandaoliang-Kushuiquan zone. Nevertheless, no large gold deposit except some polymetallic ore deposit can be prospected in the northwestern part of the Yanjin’gou zone, to the west of the line from Shuizhaxigou to Huangtiekuanggou in the Yinshigou-Hongqigou zone, and the eastern part of the Sandaoliang-Kushuiquan zone. This point is supported by the preliminary ore-prospect practice around the Longtanggou area in 2014. |
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| Keywords: | two kinds of ore-controlling structural system gold mineralization polymetallic mineralization further prospecting for gold Wulonggou gold ore-field |
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