贵州开阳地区“澄江组”沉积特征及环境分析

发布时间：2018-01-25 06:11

本文关键词： 岩石地层资源地层沉积特征沉积环境澄江组陡山沱期开阳贵州　出处：《地层学杂志》2017年04期 　论文类型：期刊论文

【摘要】：贵州开阳地区是中国陡山沱期磷矿的主要产出地之一,含磷地层洋水组一直是国内外研究热点,但对其底板澄江组的研究严重不足,仅在地调中对其进行简单的地层描述和对比划分。通过对澄江组岩性、沉积序列、地球化学等分析,认为该组时代可能归属于陡山沱早期。沉积环境与前人认为冰湖相完全不同,早期以干热气候的近海湖相为主,在海侵的影响下逐渐过渡到海湾相,海侵后形成近滨相,之后逐渐从海滩相到浅海陆棚相,可能存在过碳酸盐台地相,最后暴露地表接受剥蚀。在澄江组晚期,就有磷质开始沉积,在砂岩中出现胶磷矿,说明成磷在陡山沱期前就开始,但大规模成磷作用发生在陡山沱期。
[Abstract]:Kaiyang area of Guizhou Province is one of the main producing places of the Doushantuo phosphate rock in China. The study of the phosphorus-bearing formation in Yangshui formation has been a hot topic at home and abroad, but the study of Chengjiang formation on the bottom plate is seriously inadequate. The stratigraphic description and correlation are carried out only in the geological survey. The lithology, sedimentary sequence and geochemistry of Chengjiang formation are analyzed. The sedimentary environment is completely different from the previous thought that the glacial lacustrine facies is dominated by the offshore lacustrine facies with dry and hot climate and gradually transitioned to the gulf facies under the influence of transgression. After transgression, there may be carbonate platform facies from the beach facies to the shallow sea shelf facies, and finally the surface is exposed to denudation. In the late Chengjiang formation, phosphorus began to deposit. The occurrence of cemented phosphate ore in sandstone indicates that phosphorus formation began before Doushantuo period, but large-scale phosphorus formation occurred in Doushantuo period.
【作者单位】：贵州大学资源与环境工程学院;
【分类号】：P512.2;P619.2
【正文快照】： 黔中开阳磷矿素有“三阳开泰”的美誉,在地层划分上属震旦系(埃迪卡拉系)洋水组(Zy)与陡山沱组(Zd)可进行横向上对比(刘鸿允等,1966)。作为黔中陡山沱期富磷块岩分布区,开阳磷矿具有矿石品位高、矿层厚度大、矿石质量好的特点,故受国内外学者关注,对其成因也是争论不休。周茂

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