摘要
本文通过对煤系地层中的孢粉组合特征、煤岩中的植物残体、木材化石的结构解剖、生物遗迹化石及泥质岩中的粘土矿物组成、微量元素分布等一些特殊的地质现象研究,详尽分析了吐哈盆地中下侏罗统的沉积环境,并根据沉积特征将水西沟群煤系的沉积环境进行进一步分类,划分出了煤沼有机相。研究认为,早中侏罗世吐哈盆地的气候属亚热带的季节性明显的温暖潮湿气候,沉积环境以普遍浅水的河沼和湖沼为主体,水介质多为淡水、偏酸性。煤沼沉积环境可归纳为八种类型、四种有机相。
In this paper, according to these special geological phenomenon studies, such as sporopollen pattern feature in the coal - measures beds, the structure studies of plant relict flora and fossil wood in the coal rock, clay mineral composition and distribution of microelements in the organic remains fossil and the orgillite, and so on, the depositional environment of the middle - lower Jurassic in Tuha basin is analyzed. The depositional environment is further classified into the coal marsh organic phase based on the depositional feature in the coal - measures of Shuixigou group. We believe that the climate of the early - middle Jurassic epoch in Tuha basin belonged to the subtropical zone with seasonal, warm and humid. The river marsh and the lake inarsh of the shallow water were the main type body of the depositional environment. The water medium is mostly fresh water with acidity. The depositional environment of the coal marsh is divided into 8 types and 4 kinds of the organic phase.
出处
《吐哈油气》
2000年第2期1-5,96,共6页
Tuha Oil & Gas
关键词
沉积环境
煤系
沼泽
有机相
Subject terms depositional environment, coal- measures, marsh, organic phase
