[an error occurred while processing this directive] 高校地质学报 1996, 2(3) 324-331 DOI:     ISSN: 1006-7493 CN: 32-1440/P

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河北唐山赵各庄寒武系与奥陶系界线地球化学特征
沈渭洲 方一亭 倪琦生 林雨萍 刘燕
南京大学地球科学系
摘要: 本文对唐山赵各庄长山剖面寒武系与奥陶系界线上、下的地层进行了微量元素、稀土元素和碳氧同位素的综合研究,发现在寒武系与奥陶系分界处,不仅三叶虫动物群面貌有明显变化,而且几乎所有微量元素和碳、氧同位素组成均发生了不同程度的变化。依据碳、氧同位素分析,研究层段的碳酸直成岩环境的碳酸盐岩成岩环境为海底成岩环境。
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GEOCHEMICAL VARIATION ACROSS THE CAMBRIAN-ORDOVICIAN BOUNDARY AT CHANGSHAN SECTION OF ZHAOGEZHUANG, TANGSHAN
Shen Weizhou, Fang Yiting, Ni Qisheng, Li Yuping, Liu Yan
Department of Earth Science, Nanjing University, Nanjing, 210093
Abstract: The Cambrian-Ordovician boundary section at Changshan is one of the well-established sections in stratigraphic region of North China. Zhou and Zhang (1978) studied the trilobites in detail across this boundary in Zhaogezhuang area. They discovered conspicuous difference in trilobite fauna cross the Cambrian-Ordovician boundary (between bed 6 and bed 7 at Changshan section). This paper deals with the variation of isotopes (δ13C and δ18O) and trace elements across the Cambrian-Ordovician boundary at same section. The authors discovered that, besides the conspicuous difference in trilobite fauna, there is also variance at different ranges in isotope compositions and almost all trace element contents across the Cambraian-Ordovician boundary in Changshan section. This indicates the change of sedimentary environment in that time. Based on the analyses of C and O isotopes it is concluded that the carbonate rocks from the strata across the Cambrian-Ordovician boundary in Changshan section were formed in submarine environment.
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收稿日期 1996-09-20 修回日期 1996-09-20 网络版发布日期  
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