摘要
对黔东下寒武统以泥、碳岩性组合为主的多金属元素富集层(黑色页岩)的元素地球化学、δ13C,δ18O同位素以及岩性组合分析表明:微量元素蛛网图协同变化,暗示其成因上具有同源性。黑色页岩δ13C,δ18O同位素、稀土元素配分模式和富集元素组合特征,表明其具有深部热流体物质,分布有热水活动的陆棚海局限盆地边缘相带有利于元素沉淀富集。δ34S同位素和氧化还原敏感元素组合特征,暗示静水缺氧环境有利于元素沉淀。黑色页岩岩性组合特征(含磷、石煤层)和高有机碳含量支持沉积物受上升洋流影响。
The analysis is based on the elemental geochemistry, δ^13C,δ^18O isotope and lithology combination of the black shale, a set assemblage mud and carbon of lithology ,in East Guizhou. The coordinated change in spider diagrams of race elements suggests those elements have the same source. The δ^13C,δ^18O isotopes, mode of REE partition and characteristic enrichment of elements assemblage in carbonaceous shale show that the deep thermal fluid is added, and the shelf sea basin edge with distribution of hydrothermal activity is propitious to precipitation of ore elements. Evidence from the δ^34S isotope and redox-sensitive elements show that the hydrostatic hypoxia environment is also conducive to precipitation of elements. The lithologic features （phosphorus-, coal-bearing layers） and high content of organic carbon indicate that the deposits are influenced by the upwelling ocean current.
出处
《地球科学进展》
CAS
CSCD
北大核心
2013年第10期1160-1169,共10页
Advances in Earth Science
基金
"十二五"国家科技支撑计划项目05子课题"库鲁克塔格铜金铁成矿带成矿条件研究与找矿靶区评价研究"(编号:2011BAB06B04-05)
贵州地矿局地质科研项目(编号:200901)资助
关键词
下寒武统
黔东
黑色岩系
Early Cambrian
Qiandong
Black shales.
