| 华北盆地三叠纪物源特征及其沉积—构造演化 |
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| 引用本文： | 彭深远,杨文涛,张鸿禹,方特.华北盆地三叠纪物源特征及其沉积—构造演化[J].沉积学报,2022,40(5):1228-1249. |
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| 作者姓名： | 彭深远 杨文涛 张鸿禹 方特 |
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| 作者单位： | 1.河南理工大学资源环境学院, 河南 焦作 454000 |
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| 基金项目： | 国家自然科学基金42072123 |
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| 摘 要： | 华北盆地三叠纪沉积厚度大，分布广泛，其地层沉积特征很好地记录了周缘造山带或隆起区在该时期的构造演化过程。目前，前人已经对华北各地区三叠纪碎屑物源进行了大量研究，而对于物源区的认识仍存在分歧，对于盆缘地区沉积—构造演化过程的研究也相对较少。通过整理前人对华北各地区三叠纪碎屑物源研究的锆石年龄数据，并结合造山带构造演化过程和地层沉积特征，对华北盆地三叠纪碎屑物源及沉积—构造演化过程进行了整体研究。结果表明:华北北部三叠纪沉积物源均来自北缘的内蒙古隆起，锆石年龄和地层沉积特征记录了源区逐渐增强的岩浆活动和隆升过程。华北南部地区在该时期主要接受来自华北南缘二叠纪沉积盖层和北秦岭造山带的碎屑物质供给，华北南缘伴随着秦岭造山过程可能在中三叠世就已经逆冲隆升并遭受剥蚀，两者的协同演变共同控制着盆地南部沉积演化过程。鄂尔多斯盆地西北部碎屑物源主要来自阿拉善地块和北祁连造山带，西南部地区物源则主要来自盆地西南缘再旋回沉积盖层和北祁连造山带，分别为伸展和挤压状态下的内陆盆地沉积。早—中三叠世，华北盆地为统一的大型内陆沉积盆地，晚三叠世，盆地南、北缘发育沿褶皱逆冲带分布的陆内前陆盆地系统。
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| 关 键 词： | 三叠纪 华北盆地 碎屑锆石 物源分析 沉积—构造演化 |
| 收稿时间： | 2020-11-09 |
Provenance Characteristics and Sedimentary-Tectonic Evolution of the North China Basin in the Triassic: Indications from detrital zircon ages |
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| Institution: | 1.College of Resource and Environment, Henan Polytechnic University, Jiaozuo, Henan 454000, China2.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Province, Jiaozuo, Henan 454000, China |
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| Abstract: | The Triassic stratum in the North China Basin has a large thickness and wide distribution， and its sedimentary characteristics well record the tectonic evolution processes of periphery orogenic belts and their uplift area. At present， numerous studies have been performed on the Triassic detrital provenance in North China， but disagreements still exist about the source areas， and the research on sedimentary-tectonic evolution in the basin rim is relatively scant. This paper collected a large number of published age data for detrital zircons from the Triassic provenance analysis in the North China Basin and researched the detrital zircon provenance and the sedimentary-tectonic evolution processes of the North China Basin in the Triassic as a whole， combined with the tectonic evolution of orogenic belts and depositional characteristics. The results show that the Triassic clastic sediments in the northern part of North China were sourced from the Inner Mongolia paleo-uplift； detritus deposited in the southern part of north China mainly came from the sedimentary covers in southern North China Craton and the north Qinling orogenic belt； and the Alxa block and the north Qilian orogenic belt provided sediments to the northwest Ordos Basin， while the provenance in the southwest was mainly sourced from recycled sedimentary covers in the southwest basin rim and the north Qilian orogenic belt. In the Early-Middle Triassic， the entire North China Block was deposited as a large inland craton basin， with a lengthways compression. In the Late Triassic， foreland basin systems developed along the fold and thrust belts in the north and south margins of the North China Block， under sustained plate squeeze and collision orogeny. Meanwhile， imbalanced east-west directional compression induced the eastern North China Block uplift and denudation， and the western Ordos Basin deposited successively in the inland craton basin. |
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