梁超;解习农;史冠中;

• 1:中国地质大学海洋学院
• 2:中国地质大学构造与油气资源教育部重点实验室
• 3:中国地质大学资源学院

摘要(Abstract)：

内蒙古满都拉地区中二叠统哲斯组上段的重力流堆积特征对理解该区中二叠世晚期的沉积环境具有重要意义。通过对研究区哲斯组上段地层野外露头精细的沉积学研究,识别出了4种重力流沉积岩相组合类型:(1)碎屑流沉积,灰色砾岩,砾石长轴平行层面排列,基质多富含泥质;(2)混合重力流沉积,下部为灰色砾岩,上部为灰色砂岩或泥质砂岩,砾岩中砾石长轴平行层面排列,基质富含泥质,砂岩和泥质砂岩中见较多细小碎屑;(3)高密度浊流沉积,灰色块状砂岩或泥质砂岩,内部常见细小泥质碎屑,偶见干净块状砂岩中分布较多泥质粉砂岩、泥岩团块和撕裂屑;(4)低密度浊流沉积,下部为灰色薄层粉砂岩、泥质粉砂岩,向上变为薄层泥岩。垂向上4种重力流沉积类型相互叠置,发育多个沉积旋回;空间上呈席状展布。剖面对比揭示了重力流沉积由以碎屑流和混合重力流沉积为主-以高密度浊流沉积为主-以低密度浊流沉积为主的相变趋势。该重力流沉积体系中的流体转换需要周围水体的存在,指示其发育于水下环境;而以较薄的席状展布的高密度浊流和低密度浊流沉积为主,不同类型重力流沉积相互叠置,并且缺乏波浪和潮汐改造的沉积构造等现象,则暗示在该重力流沉积体系发育时期,满都拉地区可能处于远端较深水环境。

关键词(KeyWords)： 重力流沉积机制;流体转换;哲斯组;内蒙古满都拉

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(91528301;41402192;41372112);; 内蒙古满都拉地区晚古生代浊积岩沉积物源研究(2014M562080)

作者(Author): 梁超;解习农;史冠中;

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