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| 瓮安震旦系磷块岩中的生物成矿作用 |
| The biomineralization of phosphorites from the Sinian Doushantuo Formation in Weng'an, Guizhou |
| 投稿时间：2015-10-31 修订日期：2015-10-31 |
| DOI： |
| 中文关键词: 陡山沱组 白云质磷块岩 有机地球化学 贵州瓮安 |
| 英文关键词:Doushantuo Formation, dolomitic phosphorite, organic geochemistry, Weng'an in Guizhou |
| 基金项目:兰州大学甘肃省西部矿产资源重点实验室开放课题（WCRMGS-2014-06）；内蒙古自治区高等学校科学研究项目（NJZY14067）。 |
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| 中文摘要: |
| 生物的聚磷作用是磷块岩形成不可忽视的因素，海相磷块岩的大规模形成与生物成矿作用之间的关系十分密切。黔中地区震旦系地层有较厚的含磷岩系，震旦纪生物群的复苏和繁盛可能对同期磷块岩的沉积有促进作用。综合当前研究现状，以震旦系瓮安富磷地层中抽提的有机组分为主要研究载体，采用生物标志物等技术从分子水平对其进行测试，包括正构烷烃在内的多种分子化石参数特征暗示其生物母质源于菌藻类；正构烷烃δ13C值变化曲线反映了南沱冰期后海洋中低等水生生物的种类相对单一。 |
| 英文摘要: |
| Biological accumulation of phosphorus was an important factor for phosphorite sedimentary directly or indirectly. The marine phosphorites had closely contact with the biomineralization. Phosphogenesis emerged in the Sinian Doushantuo Formation in Guizhou province. The biological prosperous event in these period may primarily responsible for the phosphorus deposit. From the perspective of genesis, Sinian phosphorite in Weng'an was investigated. The biomarker analysis of the dolomitic phosphorite samples has been carried out, and the hydrocarbons fractions contained n-alkanes,terpanes, steranes and so on. The result indicated that the sources of the organic matters in phosphorite came from algaes and bacteria.Carbon isotope compositions of individual n-alkanes showed the single biological components and more features of lower aquatic organisms. Dolomitic phosphate formed in more oxidation sedimentary environment. |
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