贵州清镇陡山沱组帽白云岩地球化学特征以及其中藻类化石Beltanelliodes podolicus发现
- 贵州大学喀斯特环境与地质灾害防治教育部重点实验室贵阳550025
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2009-12-10
摘要: 贵州清镇陡山沱组为浅海白云岩、泥质白云岩，在陡山沱组底部泥质白云岩中产大量的圆盘状炭质化石，个体直径为2~15 mm。由于以前发现类似的化石主要保存在泥岩中，而碳酸盐岩中这类化石只有俄罗斯地台上发现过，从化石保存的结构分析，其应该归属藻类中的Chuarid。通过对陡山沱组帽白云岩的碳同位素分析，其具有典型的帽碳酸盐岩碳同位素负异常的特征，这表明在冰后浅海滨岸泻湖环境，球形藻类已经繁盛。同时，研究发现浅海滨岸泻湖环境冰后碳酸盐沉积是一个钙质（白云质）逐渐增加的渐变过程，而非Hoffman等认为的非常快速沉积。
Geochemical Characteristics of Doushantuo Cap Carbonate (Dolostone) and Discovery of Beltanelliodes Podolicus Fossil in
- Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang550025
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2009-12-10
Abstract: The basal Doushantuo Formation in Qingzhen County, Guizhou Province, China, consists of mudstones, muddolostones, dolosandstones, thin dolostones and thick dolostones. The preservedwell and abundant carbon discform fossils, 2~15 mm in diameter, the carbon discform fossil was first discovered in dolostone in China. According to shape and feature of fossil, it may belong to algae fossil Chuarid. The cap dolostone of Doushantuo Formation in Qingzhen County, Guizhou Province, China, shows typical negative carbon isotopic composition of Marinoan Cap carbonate. Therefore, it reflects that abundant algae live in shallow lagoon after glaciation. Additionally, carbonate content rise gradually from glaciationend to carbonate (or dolostone) deposit in shallow lagoon, the feature shows that form of cap dolostone is gradually after glaciation, more than Hoffman et al .(1998) suggested that the cap dolostone is formed suddenly after glaciation.
杨瑞东. 贵州清镇陡山沱组帽白云岩地球化学特征以及其中藻类化石Beltanelliodes podolicus发现[J]. 沉积学报, 2009, 27(6): 1050-1056.
| 引用本文: |
杨瑞东. 贵州清镇陡山沱组帽白云岩地球化学特征以及其中藻类化石Beltanelliodes podolicus发现[J]. 沉积学报, 2009, 27(6): 1050-1056.
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YANG Ruidong. Geochemical Characteristics of Doushantuo Cap Carbonate (Dolostone) and Discovery of Beltanelliodes Podolicus Fossil in[J]. Acta Sedimentologica Sinica, 2009, 27(6): 1050-1056.
| Citation: |
YANG Ruidong. Geochemical Characteristics of Doushantuo Cap Carbonate (Dolostone) and Discovery of Beltanelliodes Podolicus Fossil in[J]. Acta Sedimentologica Sinica, 2009, 27(6): 1050-1056.
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