广西大厂矿田拉么-羊角尖一带含矿地层元素地球化学特征及其指示意义  

Element Geochemistry of Ore-Containing Strata and its Significance for Deep Prospecting in the Lame-Yangjiaojian Area of the Dachang Ore Field,Guangxi

作　　者：王东明[1,2] 于萍[1,2] 黑欢[2] 刘博胜 袁远[3] 黄惠明[3] 王显彬[4] 

机构地区：[1]黑龙江省区域地质调查所,黑龙江哈尔滨150080 [2]长安大学地球科学与资源学院,长安大学成矿作用与动力学实验室,陕西西安710054 [3]广西华锡集团有限公司,广西柳州545006 [4]广西大学资源与环境学院,广西南宁530004

出　　处：《大地构造与成矿学》2012年第3期384-391,共8页Geotectonica et Metallogenia

基　　金：国家深部探测技术与实验研究专项"南岭成矿带地壳岩浆系统结构探测实验"课题(项目编号:SinoProbe-03-01);全国危机矿山典型矿床及区域成矿规律总结研究专项"桂东-粤西地区铅锌金等矿床成矿规律总结研究"(项目编号:20089946);国土资源部公益性行业科研专项:我国典型金属矿床科学基地研究(项目编号:200911007)资助

摘　　要：广西大厂矿田锡矿体主要赋存于上泥盆统,锌铜矿体主要赋存在锡矿体的下部,以中泥盆统为主。通过对拉么-羊角尖一带四个钻孔中不同深度、不同岩石类型样品成矿元素含量的系统分析,探讨了成矿元素在空间上的变化规律。结果显示,绝大多数成矿元素在岩体中含量最低,向上至各个地层中呈锯齿状变化,而且多数成矿元素的高值点并没有在岩体的内部或边缘,而是远离一段距离,Zn、Cu集中在罗富组灰岩蚀变后的透辉石绿帘石化矽卡岩中。这种元素含量的变化一方面反映了成矿元素运移的方向是由下而上,另一方面也反映了成矿元素的富集与岩石类型密切相关,说明矿床为岩浆热液成因。Upper Devonian is the main ore-bearing strata for the stratiform ore bodies in the Dachang ore field in Guangxi. Zinc-copper ore bodies are enriched in Middle Devonian,below the stratiform ore bodies. This paper analyzed the ore metal contents of samples from four representative drill holes in the Lame-Yangjiaojian area. The results show that most of the ore-forming elements have the lowest contents in the granite and exhibiting zigzag variation tendency in the host rocks. Ore-forming elements are enriched far from the granite, neither in nor beside it. Most of the high contents of zinc and copper are concentrated in diopside-epidote skarn of the Luofu Group of Middle Devonian. The results indicate that the ore-forming elements migrating from the granite to the host rocks, and preferentially enriched in certain rock types, which is also suggestive of magmatic hydrothermal origin for the deposit.

关 键 词：广西大厂矿田 含矿地层 元素地球化学 指示意义 

分 类 号：P595[天文地球—地球化学] P611[天文地球—地质学]