蒋苏扬;黄文辉;张永生;刑恩袁;桂宝玲;彭渊;赵海彤;商雯君;

• 1:中国地质大学(北京)能源学院

• 2:中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室

• 3:中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室

• 4:中国地质大学(北京)非常规天然气地质评价与开发工程北京市重点实验室

摘要(Abstract)：

在鄂尔多斯盆地西缘北段三道坎组砂岩的岩性识别与划分的基础上,通过常量、微量和稀土元素分析,结合周缘锆石年龄图谱,研究三道坎组沉积期的构造背景及物源,建立鄂尔多斯盆地西缘奥陶纪构造模式。结果表明:三道坎组砂岩以石英砂岩为主,含有少量岩屑石英砂岩,整体受到较强烈的风化作用;三道坎组砂岩表现为轻稀土元素富集,且分异程度较大,重稀土元素亏损,且变化较为平缓,δEu具有明显负异常,δCe为轻微亏损的特征,物源来自于西北部阿拉善地块;三道坎组砂岩的物源呈现多源性,物源除来自于鄂尔多斯地块本身外,还来自于西北部孔兹岩系和阿拉善地块;研究区在早古生代受到北祁连造山带的影响,秦岭—祁连海洋壳在三道坎组沉积期向北东方向俯冲,研究区整体处于岛弧靠近陆一侧的弧后盆地,为拟定鄂尔多斯西缘从拉张向挤压构造体制转变时间提供参考。

关键词(KeyWords)：鄂尔多斯盆地西缘;奥陶纪;元素地球化学;碎屑锆石年龄;构造背景;物源分析

Abstract:

Keywords:

基金项目(Foundation):国家重点研发计划项目(2017YFC0602806)

作者(Author):蒋苏扬;黄文辉;张永生;刑恩袁;桂宝玲;彭渊;赵海彤;商雯君;

Email:

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