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- Title
鄂尔多斯盆地南部二叠系砂岩碎屑锆石年代学特征及 地质意义.
- Authors
王峰; 刘新社; 赵伟波; 张雷; 虎建玲; 田景春; 陈蓉; 王集; 吴静仪; 肖云霄
- Abstract
The material sources and changes of terrigenous clastic rocks are closely related to sedimentary basins and tectonic evolution. Based on the identification of rock thin sections, quantitative mineralogical analysis, and detrital zircon U-Pb chronology of sandstone samples from the Shanxi, Shihezi, and Shiqianfeng Formations of the Permian Shichuanhe sectionin the Tongchuan area, southern Ordos Basin, the provenance was traced, and the tectonicsedimentary process of Permian in southern Ordos Basin was examined. The results show that the detrital zircon from the Early Permian Shanxi Group had four major age group peaks at 364 Ma, 450 Ma, 946 Ma, and 2 446 Ma. The detrital zircons from the Lower Shihezi Formation in the Middle Permian had three major age group peaks at 294 Ma, 1 963.4 Ma, and 2 499 Ma. The main peak value of detrital zircons from the Late Permian Shiqianfeng Formation was 1 876.5 Ma, and the weak peak values were 310.5 Ma and 2 523 Ma. There is a lack of Neoproterozoic and Early Paleozoic detrital zircon records representing the North Qinling orogenic belt. The main provenance of the Shanxi Formation is thought to be the North Qinling orogenic belt, and the secondary provenance is the structural belt of the southern margin of North China. The provenance of the Shihezi Formation is provided by the North Qinling orogenic belt, the structural belt of the southern margin of North China Plate, and the western segment of Inner Mongolia uplift. The provenance of the Shiqianfeng Formation is the structural belt in the southern margin of North China. During the Shanxi period of the Early Permian, the uplift of the southern margin of North China was low and did not affect the source of the North Qinling orogenic belt. During the Shihezi period, the tectonics of the Mianlue Ocean changed from passive tension to active compression, and the Qinling orogenic belt was in a state of continuous uplift, resulting in the continuous uplift of the southern margin of the North China Plate. During the Shiqianfeng period, the southern margin of North China was strongly uplifted, not only providing material sources for the Tongchuan area, but also preventing materials from the North Qinling orogenic belt from entering the study area. Based on the comparison between the Permian provenance analysis results in the Tongchuan area and the zircon data, the southern margin of the Ordos Basin uplifted from east to west. This difference in time can reflect the start-up process of the scissors-type closed collision between the North China and South China Plates from east to west in the Permian, and the evolution of paleotopography and provenance system caused by this behavior.
- Publication
Acta Sedimentologica Sinica, 2023, Vol 41, Issue 5, p1396
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000-0550.2022.118