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地质科学  1988, Vol. Issue (1): 57-67    DOI:
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磷块岩结核的显微结构和生成特点
赵东旭
中国科学院地质研究所
MICROSTRUCTURES OF CONCRETIONARY PHOSPHORITES AND THEIR GENETIC CHARACTERISTICS
Zhao Dongxu
Institute of Geology, Academia Sinica, Beijing
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摘要 磷酸盐结核主要由磷质凝块、藻类碎屑和纤柱状磷灰石组成。呈特殊的栉壳状结构。结核中的凝块和藻屑与围岩中的氧化硅、粘土是同时在海底沉积的。纤状磷灰石则是在成岩期间从孔隙水中沉淀的。这些磷酸盐结核是由于纤状磷灰石在碱性微环境中不断淀积增长而成。
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赵东旭
关键词磷酸盐   结核   微环境   淀积   增长     
Abstract: The phosphatic concretions are relatively concentrated in the siliceous clay rocks. They mainly spreaded in the western part of Hunan, cental part of Guizhou and southeastern part of Sichuan. As to geological times, they belong to the Sinian Doushantou age and Early Cambrian, respectively.The phosphatic concretion is composed of several different minerals: mainly apatite and quantz, and small amount of calsite, illite, pyrite, limonite and orgenic carbon, etc. The striking characteristics of the phosphatic concretion are the broad variation of P2O5 content (from 0.50% to 32.85%). Some concretions containing the lowest P2O5 percentage (0.50%) are at the same time richest in SiO2(95.58%). This may arise from sillfication during diagenesis.The phosphatic concretions are mainly conposed of phosphatic clots, algal clasts and fibrous apatite. They formed the special pectination. The clots and algal jlasts in concretion were deposited on the sea-floor together with silica and clay in adjoining rock at the same time. The fibrous apatite was precipitated from pore water during diagenesis. The phosphatic concretions may be formed due to continuous precipitation and growth of the fibrous apatite in an alkaline microenvironment.
Key wordsphosphate   concretion   microenvironment   precipitation   growth   
收稿日期: 1986-08-01;
引用本文:   
赵东旭. 1988, 磷块岩结核的显微结构和生成特点. 地质科学, (1): 57-67.
Zhao Dongxu. MICROSTRUCTURES OF CONCRETIONARY PHOSPHORITES AND THEIR GENETIC CHARACTERISTICS[J]. Chinese Journal of Geology, 1988, (1): 57-67.
 
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[2] 王世杰, 季宏兵, 孙承兴. 贵州平坝县白云岩风化壳中稀土元素分布特征之初步研究[J]. 地质科学, 2001, (4): 474-480.
[3] 雷加锦, 李任伟, 曹杰. 上扬子区早寒武世黑色页岩磷结核特征及生化淀磷机制[J]. 地质科学, 2000, (3): 277-287.
 
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