摘要
通过野外调查采样和测试分析等,对黔西南龙潭组岩性、岩相及岩矿石元素地球化学特征进行了研究,认为:龙潭组为海陆交互相沉积环境,成岩物质主要来源于西北部陆源泥质碎屑、炭质、钙质、硅质等,其次来源于西北部峨眉山玄武岩喷发物质的沉积或再沉积,少数来源于东南部深水海槽中的硅质、钙质等;龙潭组成岩物质以正常陆源碎屑沉积为主,但混入了部分火山碎屑岩沉积,纵向上为氧化-弱氧化-弱还原沉积环境;Au、As、Sb等中低温热液成矿元素共同指示了金、锑等热液蚀变-成矿作用,以及峨眉山玄武岩喷发可能对金矿成矿的贡献;Au、As、Sb、Tl、Co、W等成矿元素的聚类关系,可推论龙潭组富含的火山凝灰物质是金矿的重要成矿物质来源,龙潭组及其下覆的峨眉山玄武岩组是金矿的矿源层之一。
By field survey and testing analyses, the lithology and rock facies of Longtan formation and geo- chemical characteristics of rock elements in southwest Guizhou are studied. It＇s thought Longtan formation is marine -continental alternating facies sedimentary environment, the main sources of lithogenietic material are terrigenous argillaceous clast, carbon, calcium and silicon, the secondary source are the sediment or resedi- ment of basalt eruption in northwest Emeishan, few comes from silicon and calcium in deep trough in the southeast. The lithogenetic material of Longtan formation mainly is normal terrigenous clastic sediment with some volcanic clastic sediment, it＇s a oxidation- weak oxidation- reduction environment verdically. Au, As, Sb and other middle-low temperature mineralized geothermal element indicates the geothermal alteration min- eralization of gold, antimony and the possible contribution of basalt eruption of Emeishan to gold mineralization. The clustering relation of Au, As, Sb, T1, Co, W and other mineralized elements can infer the abundant volcanic tuff material of Longtan formation is and its underlie Xuanwuyan formation of Emaishan are an important source of gold deposit, Longtan formation one of layer where gold formed.
出处
《贵州地质》
2014年第1期10-20,共11页
Guizhou Geology
基金
贵州省地矿局2009年度重大科研项目"水城-紫云-南丹晚古生代裂陷作用及其与主要矿产的关系"(黔地矿科(2009)15号)
关键词
沉积环境
成矿物质来源
微量元素
龙潭组
黔西南
Sedimentary environment
Ore - formation material
Trace element
Longtan formation
Southwest Guizhou
