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.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
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
关键词
广西大厂矿田
含矿地层
元素地球化学
指示意义
Dachang ore filed
Guangxi
ore-bearing strata
element geochemistry
indicative significance
