| 摘要: |
| 江汉盐湖盆地潜江凹陷古近系潜江组广泛沉积了一套盐间非砂岩,本文详细研究了该套盐间非砂岩中白云岩的分布、类型、矿物学特征及地球化学特征,探讨了盐间白云岩的成因。研究表明,该套白云岩主要为泥晶白云岩。发育程度与盐岩量成正比。盐间白云岩的矿物组分复杂,白云石有序度低,微量元素以富Fe、Na、高Fe/Mn比值为特征。盐间白云岩主要为盐湖湖盆沉积环境的产物,水体盐度高,总体为碱性环境,Mg/Ca比值低,主要为原生-准同生阶段沉积的产物。 |
| 关键词: 江汉盆地 盐湖 白云岩 成因 |
| DOI： |
| 附件 |
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| Characteristics and genesis of the inter-salt dolostones in the Jianghan Basin |
| KE Xiao-ping, QIN Jian-xiong, LI Yu-sheng, HUANG Ke-nan, LIU Xiu-feng |
(1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, Hubei, China;
2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. Research Institute of Petroleum Exploration and Development, Jianghan Oil Field Company, SINOPEC, Qianjiang 433124, Hubei, China) |
| Abstract: |
| A succession of inter-salt non-sandstones occurs on a wide range of scales in the Palaeogene Qianjiang Formation in the Qianjiang depression,Jianghan salt lake basin.The present paper deals,in detail,with the distribution,type,mineralogy,geochemistry and genesis of the dolostones in the inter-salt non-sandstones from the basin.The inter-salt dolostones dominated by micritic dolostones are characterized by complex mineral compositions,lower ordering degree,rich Fe and Na and high Fe/Mn ratios,and thus interpreted as the products deposited in the sedimentary environment of salt lake basin during the primary-penecontemporaneous stages. |
| Key words: Jianghan Basin salt lake dolostone genesis |
