• 责任者：Ren Guangming (Chengdu Institute of Geology and Mineral Resources ; China Geological Survey ; Chengdu 610082 ; China) ; Wang Peng
• 刊名：Geological Review
• 出版年：2011
• 卷期：57(4)
• 关键词：放射虫类 ; radiolarians ; 硅质岩 ; silicolite ; 云南 ; Yunnan Province
• 页码：p.505-514
• 图表：3 illus., 3 tables, 69 refs.
• 分类号：0803
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

In this paper, the authors found some important fossils of Helenifore robustum and Helenifore laticlavium radiolarian fauna from the bedded chert of the Liujiang Formation, which distributed abroad in southeastern Yunnan Province, so the chert is Frasnian of Late Devonian. The chert has geochemical characteristics of continental edge chert, minority has characteristics of abyss. The V contents are mainly 14.5~30.9 μg/g, showing the characteristics of continental edge chert; and a few are as high as 75.3 μg/g and 218 μg/g, might be related to hydrothermal action. U/Th ratios are mainly between 0.27 and 0.40, average is 0.86, three samples have high U/Th ratios greater than 1.0, indicating that the chert is mainly natural biogenetic, parts are strongly affected by hydrothermal action.