黔中寒武纪梅树村期磷块岩小壳动物化石结构和成分:对生物成磷的制约
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贵州大学资源与环境工程学院,贵州大学喀斯特地质资源与环境教育部重点实验室

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国家重点基础研究发展计划(973计划),自然资源部省合作试点项目


Microstructure and composition of the small shelly fossils in Cambrian Meishucun stage phosphorite rock, Central Guizhou: constraints on biological phosphorus formation
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1.College of Resources and Environmental Engineering, Guizhou University,Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University;2.College of Resources and Environmental Engineering, Guizhou University。Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University

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    摘要:

    小壳动物化石微结构及壳体成分的鉴定对于揭露寒武纪早期小壳动物群的演化具有重要意义,黔中地区早寒武世梅树村期磷块岩中就保存了大量的小壳化石,而以往对小壳化石微结构及成分方面的研究较少。本文利用电子显微镜、扫描电镜对岩石薄片和酸处理的小壳化石个体观察测试,分析了贵州织金熊家场、清镇落夯磷块岩中小壳动物化石微结构、壳体成分特征。结果显示,织金、清镇磷块岩中小壳化石多样性及其壳体成分表现一致,主要为软舌螺类,其成分为P、Ca、F、O等氟磷灰石组成元素;小壳化石壳体保存有明显的纳米级磷灰石矿化颗粒骨架、多圈层结构、溶蚀多孔隙和管体嵌套的现象。另外,通过电子探针对小壳化石进行原位微区元素面扫描,发现主要元素P、Ca分布在小壳化石及小壳化石碎片中,胶结物几乎不含P元素;同时借助薄片全玻面扫描推断全岩小壳动物化石(含化石碎片)含量,与磷块岩中磷含量呈正相关关系,认为寒武纪梅树村期小壳动物的繁盛对同期磷块岩的形成具有重要贡献。

    Abstract:

    The identification of the microstructure and shell composition of small shelly fossils are of great significance for revealing the evolution of the early Cambrian small shelly fossils, and a large number of small shelly fossils have been preserved in the early Cambrian Meishucun stage’s phosphorite rock in Central Guizhou, but there were few studies on the microstructure and composition of small shelly fossils in the past. In this paper, the microstructure and shell composition characteristics of small shelly fossils in Zhijin Xiongjiachang and Qingzhen Luohang phosphorite rock in Guizhou Province were analyzed by electron microscope and scanning electron microscope (SEM-EDS) to observe and test individual small shelly fossils in rock thin sections and acid-treated small shelly fossils. The results showed that the diversity of small shell fossils and their shell composition in the phosphorite rock of Zhijin and Qingzhen were consistent, mainly Hyolitha, and their components were fluoroapatite elements such as P, Ca, F, and O. The small shelly fossils preserves obvious nano-scale apatite mineralized particle skeleton, multi-circle structure, dissolved pores and tube nesting. In addition, the insitu micro-element surface scanning of the small shelly fossils was carried out by electron exploration, and it was found that the main elements P and Ca were distributed in the small shelly fossils and their fragments, and the cementation almost did not contain P elements. At the same time, the content of small shelly fossils (including fossil fragments) in the whole rock was inferred by the help of thin-slice full-glass surface scanning, which was positively correlated with the phosphorus content in the phosphorite rock, and it was believed that the prosperity of small shelly fossils in the Cambrian Meishucun stage had an important contribution to the formation of phosphorite rock in the same period.

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  • 收稿日期:2024-01-05
  • 最后修改日期:2024-02-16
  • 录用日期:2024-02-28
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