摘要
北大巴山地区早古生代产有两类硅质岩，一类为层状硅质岩，富Ｃｕ，Ｚｎ，Ｂａ，Ｕ，Ｐ，Ｎｉ而贫Ｍｎ，ｗ（ＲＥＥ）值很高，ｗ（ＬＲＥＥ）／ｗ（ＨＲＥＥ）值低（０．３３０～０．９９０），负Ｃｅ异常明显，稀土分布曲线呈Ｖ字形，其成因与火山活动有关，形成于深海环境；另一类为硅质结核，贫Ｃｕ，Ｚｎ，Ｂａ，Ｕ，Ｐ，Ｎｉ而富Ｍｎ，ｗ（ＲＥＥ）值低，ｗ（ＬＲＥＥ）／ｗ（ＨＲＥＥ）值高（３．３９０～３．９２０），无负Ｃｅ异常，稀土分布曲线为陡右倾，为生物成因。
Two kinds of the silicalite occurred in the north of Dabashan mountains in the Early Palaeozoic: the layered silicalite and the siliceous nodule. The layered silicalite is rich in Cu, Zn, Ba, U, P and Ni, but poor in Mn. In addition, the layered silicalite contains a very high value of w (REE), but a low value of w (LREE)/ w (HREE) (0.330-0.990) with the distinctively negative anomaly of Ce. Its REE distribution curve is in a V shape. The layered silicalite, whose origin was related to the volcanic movement, occurred in the deep sea environment. However, the siliceous nodule is poor in Cu, Zn, Ba, U, P and Ni, but rich in Mn. The siliceous nodule shows a very low value of w (REE), but a high value of w (LREE)/ w (HREE) (3.390-3.920) free of the negative anomaly of Ce. The REE distribution curve of the siliceous nodule is steep toward the right_handed direction. The siliceous nodule, whose origin was related to the living organisms, occurred in the shallow_water environment.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1999年第3期246-250,共5页
Earth Science-Journal of China University of Geosciences
基金
国家重点科技攻关项目
关键词
硅质岩
地球化学
北大巴山
岩石成因
silicalite, geochemistry, north of Dabashan mountains.
