鄂尔多斯东北部山西组—上石盒子组砂岩特征及物源分析  

Sandstone characteristic and provenance analysis of the Permian Shanxi Formation-Shangshihezi Formation in the northeast of Ordos Basin,China

作　　者：陈安清[1] 陈洪德[1] 向芳[1] 刘文均[1] 侯中健[1] 尚云志[2] 叶黎明[1] 李洁[1] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《成都理工大学学报（自然科学版）》2007年第3期305-311,共7页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：鄂尔多斯盆地东北部二叠系山西组-上石盒子组砂岩的碎屑组分、岩屑类型、石英阴极发光、重矿物组合、古流向的研究结果显示,物源为盆地北面阴山古陆中元古界变质岩和沉积岩组成的早期盖层,以及古元古界和太古宇变质岩组成的结晶基底。砂岩组分的Dickinson三角图解表明,物源总体来自再旋回造山带,含有混合区(切割弧)和火山物质成分。这些结果揭示了华北板块和西伯利亚板块缝合过程的拉张-挤压旋回,由此形成具有明显旋回性的物源供给。在此过程中,每一演化阶段中所形成的超长期旋回的早期阶段,都对应着相对构造活跃时期和强物源供应期。This paper analyzes the clastic composition, debris, cathodoluminescence, heavy minerals and paleocurrent of the sandstone of the Permian Shanxi Formation -- Shangshihezi Formation in the northeast of Ordos Basin. These evidences display that the provenance derives from the north Yinshan paleoland, the primary cover composed of the Mesoproterozoic sedimentary rock and metamorphic rocks, and the crystallization basement composed of the Paleoproterozoic and Archean metamorphic rocks. By Dickinson triplot of elastic component, most of sands fall in the recycled orogen, and some in mixed and volcanic provenance. All the studies reveal the extension-compression cycle process of the sutural movement between the Siberian plate and North China plate. Consequently, the provenance supply represents obvious cycles. In the process, every early period of the super-long-term cycle formed by regional tectonism is combined with a period of activity regional tectonism and abundant provenance supply. In a word, the types and structural characteristic of basin filling is the response of coupling between the tectonism in provenance area and basin evolution.

关 键 词：鄂尔多斯盆地 物源分析 Dickinson三角图解 山西组-上石盒子组 

分 类 号：P588.21[天文地球—岩石学]