广西大厂铜坑锡多金属矿床方解石C、O同位素特征  

C,O isotopic compositions of calcite in the Tongkeng tin-polymetallic deposit in Dachang,Guangxi

作　　者：胡志戍 蔡明海 刘嘉兴 李晔 彭振安 张含 邵主助 韦绍成 苑宏伟 胡鹏飞 肖俊杰 HU Zhishu;CAI Minghai;LIU Jiaxing;LI Ye;PENG Zhen'an;ZHANG Han;SHAO Zhuzhu;WEI Shaocheng;YUAN Hongwei;HU Pengfei;XIAO Junjie(College of Resources Environment and Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《中国矿业》2020年第S01期234-240,共7页China Mining Magazine

基　　金：广西大厂锡石硫化物型锡矿科学研究基地项目资助(编号:20091107-13)。

摘　　要：铜坑锡多金属矿床是丹池成矿带中段最为典型的超大型矿床。本文对其上部锡多金属矿体和深部锌铜矿体矿石中方解石进行了C、O同位素测试研究。结果表明,锡多金属矿体方解石δ^13 C(δ^13 C=-8.9‰~0.12‰)、δ^18 O(δ^18 O=11.8‰~20.1‰),锌铜矿体方解石δ^13 C(δ^13 C=-6.7‰^-1‰)、δ^18 O(δ^18 O=10.3‰~15.9‰),空间上呈现规律性变化,表明两者在成因上存在有机联系。矿石中方解石δ^13 C低于围岩地层,高于岩浆流体,可能为岩浆热液与围岩共同作用的结果;随着离岩体的距离增加,δ^18 O平均值不断降低,说明区内成矿是一个岩浆流体与围岩不断进行同位素交换而导致方解石δ^18 O值不断降低的过程,热液运移方向是从岩体→矽卡岩型锌铜矿→锡多金属矿。The Tongkeng tin-polymetallic deposit in northwestern Guangxi Zhuang Autonomous Region,southern China,is the representative deposit of the largest scale in the middle part of Danchi metallogenic belt.In this paper,C,O isotope tests were carried out on calcite in the tin-polymetallic ores and the zinc-copper ores.Calcite in the tin polymetallic ores yields(δ^13 C=-8.9‰-0.12‰),(δ^18 O=11.8‰-20.1‰),And calcite in the zinc-copper ores yields(δ^13 C=-6.7‰-1‰),δ^18 O(δ^18 O=10.3‰-15.9‰),These results show a regular change in space,indicating that they have an organic relationship in the genesis.The.δ^13 C of calcite in the ore is lower than that of the surrounding rock strata and higher than that of magmatic fluid,which may be the result of the interaction of magmatic hydrothermal solution and surrounding rock;As the distance from the rock mass increase,the average value of δ^18 O continuous to decrease.indicating that the mineralization in the area is a process of constant isotope exchange between magmatic fluid and surrounding rock,and the direction of hydrothermal migration is from the rock mass→skarn-type zinc copper deposit→tin polymetallic deposit.

关 键 词：方解石 C-O同位素 成矿流体 铜坑锡多金属矿 广西大厂矿田 

分 类 号：P611[天文地球—矿床学] P597[天文地球—地质学]