江西东乡矿区沉积硅质岩的地球化学特征和成因

被引:16
作者
徐跃通
机构
[1] 山东师范大学地理系
关键词
硅质岩,地球化学,沉积,东乡;
D O I
10.14027/j.cnki.cjxb.1997.03.020
中图分类号
P588.34 [区域变质作用及岩石];
学科分类号
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。
引用
收藏
页码:112 / 116
页数:5
相关论文
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