江汉盐湖盆地盐间白云岩特征及成因分析  

Characteristics and genesis of the inter-salt dolostones in the Jianghan Basin

作　　者：柯小平[1] 覃建雄[2] 李余生[2] 黄克难 刘岫峰[2] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量重点实验室,湖北武汉430077 [2]成都理工大学沉积地质研究所,四川成都610059 [3]中国石化江汉油田分公司勘探开发研究院,湖北潜江433124

出　　处：《沉积与特提斯地质》2009年第3期1-8,共8页Sedimentary Geology and Tethyan Geology

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。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 interp...

关 键 词：江汉盆地 盐湖 白云岩 成因 

分 类 号：P588.245[天文地球—岩石学]