| 赵振明.东昆仑骆驼沟奥陶系变质砂岩中发现铜矿点及
该套地层沉积环境与成矿条件浅析[J].地质与勘探,2014,50(6):1015-1023 |
| 东昆仑骆驼沟奥陶系变质砂岩中发现铜矿点及
该套地层沉积环境与成矿条件浅析 |
| Copper ore occurrences in the Ordovician metasandstones of the Luotuogou region, East Kunlun Mountains: depositional environment and metallogenic conditions of the strata |
| 投稿时间：2014-01-21 修订日期：2014-06-28 |
| DOI： |
| 中文关键词: 东昆仑 奥陶系变质砂岩 铜矿点 沉积环境 成矿条件 |
| 英文关键词: East Kunlun Mountain, Ordovician metasandstone, copper ore occurrence, depositional environment, metallogenic conditions |
| 基金项目:中国地质调查局 “东昆仑成矿带基础地质综合研究（编号：1212010040107）” 项目资助 |
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| 中文摘要: |
| 东昆仑骆驼沟中-晚奥陶统纳赤台群的变质砂岩地层中发现铜矿点，其野外产出厚度1.90m，沿走向向西延伸5m后被新生代地层覆盖，向东被道路覆盖，沿倾向延伸不定。样品含孔雀石，灰白色，薄片状，单个薄片厚0.1~2.0cm，孔雀石呈星点状定向分布于片理之间或薄片的一个面成侵染状。据样品显微镜薄片鉴定，定名为变质石英砂岩，粒状变晶结构，具定向构造。对该样品光谱半定量检测分析，Cu为1%；X射线衍射检测分析与Cu有关的矿物，孔雀石[Cu2(CO3)(OH)2]为1%，绿铜矿[Cu2Cl(OH)3]为1%，非矿石矿物有，石英52%，斜长石25%，方解石6%，伊利石4%，白云石9%；化学定量分析Cu为0.99%，TFe为2.48%。结合野外铜矿石产出地质特征和实验测试结果，对该地区玄武岩、变玄武岩、变质砂岩、千枚岩、片岩等岩石中铜元素实际测量数据做了详细研究，表明成矿元素Cu可能来源于该地区的基性火山岩，富铜的火山岩和砂岩形成后，在区域变质作用过程中，成矿元素从变质火山岩迁移到变质砂岩中，在古生代古老盆地中沉积富集成矿。 |
| 英文摘要: |
| A copper ore occurrence has been discovered in metasandstone of the Nachitai Group in the middle-late Ordovician System in the Luotuogou area, east Kunlun Mountains. Field observations show that it is 1.9m thick, extending westward for 5m before covered by Cenozoic strata and by a road in east, and dipping to unknown depth. Its samples contain malachite which is grey-white, thin section-like with thickness 0.1-2cm, scattering distributed between schistosities on the surface of the section to form dissemination. By microscope identification, the sample is named metamorphic quartz-sandstone with grain-shaped blastic texture and orientated structure. Spectral half-quantitative analysis indicates 1% of Cu content. X-ray diffraction analysishe results reveal that 1% malachite([Cu2(CO3)(OH)2]), 1% dioptase([Cu2Cl(OH)3]), and none-ore minerals including also quartz 52%，plagioclase 25%，calcite 6%，illite 4%，and dolomite 9% . Quatitaive chemical analysis yileds contents Cu 0.99% and TFe 2.48%. In combination with the geological features and analysis results aforementioned, this work further studied the measurements of Cu contents in basalt, metabasalt, metasandstone, phyllite, and schist. The results suggest that the metallogenic element Cu possibly stemmed from the basic volcanic rock in the Nachitai Group stratum. It was inferred tha during the regional metamorphism, element Cu moved into metasandstone from metavolcanic rock, collected in the ancient deposition basin during the Paleozoic Era, and then the copper ore beds formed. |
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