| 卢财,李社,何财富.青海抗得弄舍金多金属矿床地质特征及成因分析[J].矿产勘查,2014,5(6):887-896 |
| 青海抗得弄舍金多金属矿床地质特征及成因分析 |
| Geological characteristics and genetic analysis of Kangdenongshe gold polymetallic deposit in Maduo county, Qinghai |
| 投稿时间：2014-04-16 |
| DOI： |
| 中文关键词: 金多金属矿床 矿床成因 海底喷流沉积 晚期热液叠加改造型 抗得弄舍 青海 |
| 英文关键词: gold polymetallic deposit deposit genesis seafloor exhaustive deposition late stage hydrothermal superposition and reformation Kangdenongshe Qinghai |
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| 中文摘要: |
| 抗得弄舍金多金属矿床位于东昆仑造山带的东南段,其中铅锌矿体赋存于流纹质凝灰岩中,矿体形态多呈似层状,矿体有明显的层控特征；而金铅锌银矿体主要产于灰岩与流纹质凝灰岩的层间断裂或附近的裂隙中,Au含量与重晶石含量呈正相关。硫化物的铅同位素组成表明该矿床的铅源自地幔,硫同位素组成显示富34S,说明混染了海水硫或者海相硫酸盐的硫,认为铅锌硫化物矿体与海底喷流沉积有关。重晶石的氢氧同位素组成反映流体来源有晚期热液流体特点,重晶石的流体包裹体特征为低温热液成矿,说明Au的矿化与后期热液叠加有关。成矿元素相关特征也显示,Pb-Zn元素相关性好,Au-Pb、Zn的相关性较差,说明Au与Pb、Zn不完全是同一矿化作用的产物。初步认为:该矿床属于海底喷流沉积+晚期热液叠加改造型金铅锌银多金属矿床。 |
| 英文摘要: |
| The Kangdenongshe gold polymetallic deposit is located in the southeastern part, eastern Kunlun orogenic belt, the lead-zinc ore body mainly occurs in rhyolitic tuffs mainly as stratoid structure with obvious stratabound features； while the gold-lead-zinc-silver ore body mainly occurs in the interlayer fractures between the limestone and rhyolitic tuff or the nearby fractures, where the gold grade has the positively correlation with the barite content. The study of the lead isotope composition from the ore deposit shows that the lead is originated from the mantle and the sulfur isotope composition study result shows that the ore deposit is rich with 34S and it indicated that the sulphur of the deposit is partly from seawater sulfur or the sulphate. The formation of the sulfide lead-zinc ore bodies is thought to relate to the seafloor exhaustive sediment. The hydrogen and oxygen isotope composition from the barite shows that the mineralized fluid has partly involved into the late stage hydrothermal fluid. The fluid inclusion characteristics of barite indicates that the mineralization is low temperature hydrothermal mineralization, this means that the gold mineralization is related to later hydrothermal superposition. The correlation characteristics of the metallogenic elements show that the lead and zinc has good positive correlation, while gold and lead-zinc has poorly correlation, it indicated that the deposition of lead-zinc and gold was formed in the different mineralization stages. It is concluded that the Kangdenongshe deposit is a seafloor exhaustive type gold-lead-zinc-silver deposit superimposed and reformed by late stage hydrothermal fluid. |
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