| 鄂尔多斯盆地长城系沉积充填格架与源区物质组成 |
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| 关键词:Ordos Basin Changcheng system detrital zircon dating Mesoproterozoic provenance analysis |
| 基金项目:本文由中国石油长庆油田分公司重大科技专项“鄂尔多斯盆地地震格架大剖面综合解释与基础地质研究”(编号: 2023DZZ02)、中国地质科学院基本科研业务费专项经费(编号: JKYDM2025201)和中国地质调查局地质调查项目“鄂尔多斯东南缘区域基础地质调查”(编号: DD20242779)联合资助。 |
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| Sedimentary Filling Framework and Provenance Composition of the Changcheng System in the Ordos Basin |
| The Changcheng System in the Ordos Basin is currently a key target horizon for deep hydrocarbon exploration. However, research on its depositional age, filling framework, and provenance composition remains relatively limited. Based on the latest drilling data and core samples, this study has conducted petrographic analysis, detrital zircon dating, and stratigraphic correlation of the Changcheng System. Regional correlation reveals that the Changcheng System in the Ordos Basin exhibits a distinct “bipartite” lithological character, that is the lower section consists of mafic volcanic rocks while the upper section comprises clastic sedimentary rocks. This filling framework is highly similar to that of the Xionger Rift System. Combined with previous data, our new geochronological results constrain the basal age of the upper sedimentary section to 1 673~1 632 Ma, which aligns with the revised maximum depositional age of the Changcheng System in the Yanliao area. This age interval corresponds to a significant anorogenic magmatic event in the North China Craton, recording prolonged extension following a large igneous province event. The remaining zircons define three primary age peaks at ~1.82 Ga, 2.05 Ga, and 2.5 Ga. These were likely sourced from coeval granitic intrusions in the Yinshan and Taihang Mountains, as well as recycled Paleoproterozoic metasedimentary rocks. A minor contribution may derive from proximal granitoids within the basin. |
| ZHANG Lei,WANG Yongchao,LI Zhao,WEI Lijuan,LI Han.2026.Sedimentary Filling Framework and Provenance Composition of the Changcheng System in the Ordos Basin[J].Acta Geoscientica Sinica,47(4):715-732. |
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