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上震旦统陡山沱组是鄂西地区最具工业价值的含磷地层。著名的磷矿有荆襄磷矿、宜昌磷矿、兴(山)神(农架)保(康)磷矿。迄今已有20多年的勘探史,但由于各矿区研究程度不一,又缺古生物依据,亦不能依靠同位素年龄来作划分对比,故在地层及磷矿层的划分、对比上认识不一。笔者结合磷矿特征及含磷岩系岩类组合、剖面结构特点、稀土元素特征等,将本区划分为4个磷矿分布区,将陡山沱组划分为3个岩性段、5个含磷层位。
The Upper Sinian Doushantuo Formation is the most industrially valuable phosphorus-bearing formation in Western Hubei. Well-known phosphate rock Jingxiang Phosphate, Yichang phosphate, Hing (Hill) God (Nongjia) Paul (Kang) phosphate rock. Up till now, there have been more than 20 years of exploration history. However, due to the different degrees of research in various mining areas and the lack of paleontological evidence, they can not be separated by isotopic ages. Therefore, they are not well-versed in the division and comparison of strata and phosphate rock formations. Based on the characteristics of phosphate rock and the rock assemblages, structural features of the sections and characteristics of rare earth elements, the area is divided into four phosphate distribution areas, and the Doushantuo Formation is divided into three lithologic sections and five Phosphorus layer.