| 何阳阳,蒋双宇,邓成雪.四川省康定县三碉金矿床岩矿石化学成分特征及构造环境[J].地质找矿论丛,2020,35(2):129-137 |
| 四川省康定县三碉金矿床岩矿石化学成分特征及构造环境 |
| Chemical composition characteristics and geological significance of rocks and ores in Sandiao gold deposit, Kangding county, Sichuan province |
| 投稿时间：2019-10-21 |
| DOI：10.6053/j.issn.1001-1412.2020.02.001 |
| 中文关键词: 三碉金矿床 斜长角闪岩 黑云母花岗岩 岩石地球化学 微量元素 稀土元素 构造环境 康定地区 四川省 |
| 英文关键词:Sandiao gold deposit amphibolite biotite granite petrogeochemistry trace element REE tectonic environment Kangding county Sichuan province |
| 基金项目:四川矿产资源研究中心资助项目"四川省甘孜州矿产资源经济评价研究"（编号：SCKCZY2016-ZC03）、四川省教育厅科研项目"康定大渡河金矿田流体包裹体研究"（编号：17ZB0223）、内江师范学院2018年度大学生科研项目"康定大渡河金谷成矿流体研究"（编号：18NSD-112）、内江师范学院大学生创新创业训练计划项目"大渡河流域金成矿带岩矿石元素地球化学特征研究"（编号：X2019001）联合资助。 |
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| 中文摘要: |
| 康定县境内的三碉金矿床是大渡河金矿成矿集中区内的典型矿床。本文基于野外实地调查取样、实验室分析测试工作，通过对岩矿石地球化学特征及构造环境进行研究，结果表明：1）从无矿石英→含矿石英，SiO2、Al2O3、CaO等含量均有所减少，TiO2、MnO、K2O、Na2O等变化范围不大，Fe2O3和FeO等则有明显的增高。2）斜长角闪岩的原岩为基性火山岩，δEu主要表现为正异常特征；黑云母花岗岩具有中钾钙碱性特征，形成于造山晚期，δEu表现为明显的负异常特征。即三碉金矿的形成过程中，硅铝质矿物在减少，载金金属矿物在增多；含矿流体混染和交代长英质岩浆减弱抵消负铕异常导致斜长角闪岩δEu值逐渐过渡为正异常；黑云母花岗岩δEu为负异常，是早期斜长石的晶出带走Eu作用的结果。3）矿区断裂与矿床的形成密切相关，为成矿流体的上升运移提供了有利的通道，并提供含矿石英脉的沉聚空间。 |
| 英文摘要: |
| Sandiao Au deposit in Kangding county is typical one in Daduhe Au deposit-clustered area. Based on field survey and sampling, Lab analysis study on geochemical characteristics and tectonic setting are carried out. The result shows that: 1)from Au-free quartz to Au-bearing quartz, the contents of SiO2, Al2O3 and CaO are all decreased, the variation range of TiO2, MnO, K2O and Na2O is not evedent, while Fe2O3 and FeO are obviously increased; 2)the protolith of amphibolite is basic volcanic rock with positive δEu anpmly; biotite granite is characterized by medium K calc alkaline and formed in the late orogenic period with negative δEu anomly suggesting that during the formation of Sandiao gold deposit the aluminosilicate minerals decreasing and the gold carriers, the metal minerals increased and the ore fluid disseminated and replaced the felsic magma then weakening and offsetting the negative δE of the biotite granite is the result of the early crystallization of plagioclase which takes Eu away; 3) the faults in the area are closely related to the formation of the deposit providing channel for the upward migration of ore fluid and space for the ore vein. |
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