摘要
江西东乡矿区石炭系地层中存在三层与地层整合产出的层状硅质岩。硅质岩富Ｆｅ、Ａｓ、Ｓｂ、Ｂｉ、和Ｇａ；稀土元素总量低，Ｃｅ呈弱负异常，重稀土相对富集；δ３０Ｓｉ值变化范围为０．５‰～０．８‰，δ１８Ｏ变化范围为１２．５４‰～２１．１１‰。硅质岩地球化学特征表明其成因为介于热水沉积与生物沉积之间的过渡类型。硅质岩硅同位素和稀土元素地球化学特征还表明本区硅质岩主要是在浅海环境下沉积的。
There are three bedded silicalites which are conformity with the Carboniferous System stratum in Dongxiang Mine,Jiangxi Province.These silicalites have characteristics as following:higher contents of Fe,As,Bi,Sb,Ga;lower total REE,comparatively enrichment in HREE,slightly negative Ce anomaly;δ 30 Si values range from 0.5‰ to 0.8‰,δ 18 O values range from 12.54‰ to 21.11‰.The origin is the transition type between hydrothermal sediment and biogenic sediment.And the geochemical characteristics of silicon and REE indicate that the silicalites are deposited in the epeiric sea environment.
出处
《沉积学报》
CAS
CSCD
北大核心
1997年第3期110-114,共5页
Acta Sedimentologica Sinica
