湖北震旦系磷块岩中的藻类化石 |
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引用本文: | 曹仁关.湖北震旦系磷块岩中的藻类化石[J].沉积学报,1988,6(1):97-101. |
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作者姓名: | 曹仁关 |
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作者单位: | 云南省地质科学研究所 |
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摘 要: | 湖北荆襄地区震旦系陡山沱组磷块岩特别发育,含丰富的藻类化石。陡山沱组有四层磷块岩,第一层含叠层石和核形石,第三、四层含核形石。叠层石柱体被磷酸岩紧密包裹者,品位较高;基本层理由磷灰石与白云石交替组成亮层和暗层者,品位较低;柱体中仅含团粒状磷灰石者,品位更低。
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关 键 词: | 震旦系 磷块岩 叠层石 核形石 |
收稿时间: | 1986-01-16 |
ALGAL FOSSILS OF SIMIAN PHOSPHORITE IN HUBEI |
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Institution: | Yunnan Institute of Geology |
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Abstract: | Phosphorite with abundant stromatolite in the Doushantuo Formation of Sinian System is well-developed and widespread in the Jingmen-Xiangyang region of Hubei. There are four phosphorite-beds, the first one consists of stromatolite, Baicalia minuta Komar, B. ampla Semikhatov, Conophyton yichengensis Cao (f. nov.), C. miloradovici Raaben, C. f., Paraconophyton hubeiensis Cao (f. nov.), Compactocol-lenia tuvensis Kor.; the second oncolite Osagia jianshanensis Cao (f.nov); the third oncolite Osagia minuta Z. Zhur. and the fourth oncolite, Osagia nersinica Yakschin and O. f.. P2O5 in the stromatolitic phosphorite accounts for 37.5% while the P2O5 in the oncolitic phosphorite 16-19% or less. Usually phosphorite appears in the offshore near platform, and is a kind of biochemigenic deposits. |
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