新疆焉耆盆地中生界含煤地层深水成因的判别分析

对新疆焉耆盆地沉积环境的研究发现，其侏罗系含煤系地层具有大量深水沉积特征，与传统浅水成煤的观点相悖。依据沉积地球化学的基本原理，选择渤海湾地区东营凹陷和西部吐哈盆地分别作为深水断陷湖盆和浅水聚煤盆地的标准模型，对焉耆盆地现有无机元素丰度资料作判别分析。结果表明，该盆地侏罗系地层元素特征与东营凹陷很相似，由此推知其古环境在更大程度上倾向于东部深水断陷湖盆。萨胡判别分析证明，与煤共生的粗碎屑岩不是形成于河流环境，而是形成于深水浊积沉积环境。这种观点的提出突破了浅水成煤的传统观念，为进一步研究该盆地特有的沉积、聚煤模式提供了一条新的思路，拓宽了煤岩及成煤环境研究的思维领域。

DISCRIMINANT ANALYSIS ON DEEP-WATER SEDIMENTARY ENVIRONMENT OF JURASSIC COAL-BEARING BED OF YANQI BASIN IN XINJIANG AREA

The Jurassic sedimentary environment of Yanqi Basin has lots of deep water sedimentary features in coal bearing beds. These features are inconsistent with the traditional standpoint of coal's origin which hold that the coal was formed in shallow water. According to the basic principle of sedimentary geochemistry, two geochemical sections from Dongying Sag of Bohai Bay region and Turpan Basin were selected as the standard models of deep water rift subsidence basin and shallow water coal measure basin, respectively. The discriminant analysis on inorganic element abundance shows that the palaeosedimentary environment of Jurassic in the Yanqi Basin is close to that of Dongying Sag. This point breaks away from the traditional standpoint of coal's origin, and a new approach is proposed to build a distinctive model for accumulations of coal.