摘要
鄂东南地区的晚二叠世大隆组中存在数层与地层整合产出的薄层状硅质岩，其常量元素、微量元素、稀土元素、硅和氧同位素地球化学特征表明其为热水沉积硅质岩。在Ａｌ－Ｆｅ－Ｍｎ和Ｆｅ－Ｍｎ－（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图上，硅质岩属较典型的热水沉积硅质岩。硅质岩ＭｎＯ／ＴｉＯ２＜０．５，δＣｅ平均值为０．８０，δ３０Ｓｉ值为０．３×１０－３～０．７×１０－３，表明本区晚二叠世大隆组层状硅质岩主要在浅海环境下沉积。
There exists bedded silicalite which is in conformity with the Permian System stratum in Southeastern Hubei The silicalite can be identifide as hydyothermal sediments based on the geochmical characteristics of its major elements, trace elements, rare earth elements, silicon and oxygen isotopes The silicalite belongs to hydrothermal sediments in Al-Fe-Mn and Fe-Mn-(Ni+Co+Cu) triangle diagrams The ratioes of MnO/TiO 2<0 5, the values of δCe=0 74～0 89 and δ 30 Si=0 3×10 -3 ～0 7×10 -3 show that the sedimentary setting of the silicalite during Permian Period in Southeastern Hubei is chiefly shallow-sea
出处
《桂林工学院学报》
CAS
1997年第3期204-212,共9页
Journal of Guilin University of Technology
基金
国家自然科学基金
青年基金
关键词
硅质岩
热水沉积
地球化学
沉积环境
大隆组
silicalite
hydrothermal sediment
geochemistry
sedimentary setting
Hubei
