地质学报2012，Vol.86Issue(2)：258-268,11.DOI:11-1951/P.20120113.0857.012
贵州锦屏新元古界下江群元素地球化学特征及其与金矿的关系
Elements Geochemistry of the Neoproterozoic Xiajiang Group in Jinping County,Guizhou Province, and Its Impact on the Gold Deposits
摘要
Abstract
Low-degree metamorphic clastic rocks of the Neoproterozoic Xiajiang Group in southeastern Guizhou Province host numerous quartz vein type gold deposits and prospects. But the origin of the deposits of this kind, especially gold source, has long been a research issue. Therefore, gold-bearing possibility and element geochemical characteristics of formation rocks in the Xiajiang Group have also received extensive concern. This paper conducted a systematic analysis of the trace elements and rare earth elements. Comparative study indicates that the Xiajiang Group is characterized by enrichment in As, Ba, Zr and Ti and depletion in Cr, Rb, Sr, Ta and Sc, and element association shows obvious similarity and inheritance from Fanzhao Formation to Pinglue Formation. In Addition, tuffaceous sequence in the Fanzhao and Pinglue formations has a high content of gold, and horizons which contain high contents of gold have a low REE content. Gold in the sequences has a close relation with crustal elements such as Ag, Hg and As. Therefore, gold migration and enrichment may have been closely related to hydrothermal activities and regional metamorphism. The trace element characteristics of country rocks, sequences and ore, and consistency and inheritance of REE compositions suggest that ore-forming material was derived mainly from sequences. Part of gold-bearing quartz veins in the Pingqiu gold deposit exhibit different geochemical features, indicating that it was more close to lower upper or upper mantle and some of the deep fluids were likely involved into mineralization.关键词
下江群/石英脉型金矿/微量及稀土元素/成矿物质/贵州锦屏Key words
Xiajiang Group/ quartz vein type gold deposit/ trace element and REE/ ore-forming materials/ Jinping of Guizhou Provence引用本文复制引用
张晓东,杨瑞东,刘玲,魏怀瑞..贵州锦屏新元古界下江群元素地球化学特征及其与金矿的关系[J].地质学报,2012,86(2):258-268,11.基金项目
本文为贵州大学矿床学博士点学科建设基金项目(编号GZUD2008002)资助成果. （编号GZUD2008002）
