地质学报2025，Vol.99Issue(7)：2298-2310,13.DOI:10.19762/j.cnki.dizhixuebao.2024156
鲁西泰山岩群新太古代构造特征及其地质意义
The Neoarchean structure characteristics and geological significance of the Taishan Group,western Shandong Province
摘要
Abstract
The late Neoarchaean period is a crucial phase in the evolution of Earth's tectonics.Recent studies suggest this period as a key window for the transition from vertical to horizontal motion,supported by numerical simulations.West Shandong Province,located in the eastern part of the North China craton,preserves many Archean structures,making it an ideal site for analyzing early tectonic evolution.This study examines the Archean Taishan Group in the Mengyin area of West Shandong Province.Detailed structural and chronological analyses reveal that the Archean structures of the Taishan Group experienced deformation in three distinct stages:the first stage,DA-1 assemblage,includes early foliation S1 and tight foldF1.The second stage,DA2,is characterized by numerous vertical folds,foliation S2,and thrust faults.The third stage,DA-3,involves the development of extensive ductile shear zones and horizontal or near-horizontal lineation.Geochronological analysis of key samples,along with published data,indicates that these stages of deformation occurred within the timeframes of 2.56～2.53 Ga,2.53～2.52 Ga,and 2.52～2.50 Ga respectively.Geometric analysis of various deformation structures,including large vertical folds,thrust faults,and horizontal lineations,suggests that the evolution of these stages in western Shandong Province represents a comprehensive Archean orogeny.The deformation structures in the Taishan Group differ from dome and keel structures formed by vertical mechanisms but closely resemble those formed by lateral extrusion orogeny in the Phanerozoic.Therefore,it is proposed that the Archean horizontal structures in West Shandong Province may represent evidence of the earliest plate tectonic systems.关键词
泰山岩群/新太古代/多阶段变形/侧向挤压/水平运动构造体制Key words
Taishan Group/Neoarchean/multi-stage deformation/lateral extrusion/horizontal motion structural regime引用本文复制引用
李晓东,王伟,田忠华,贾督,罗博文,周进伟..鲁西泰山岩群新太古代构造特征及其地质意义[J].地质学报,2025,99(7):2298-2310,13.基金项目
本文为国家自然科学基金项目(编号42172222)和科技部国家重点研发计划课题一"胶东地区构造演化历史与成矿系统形成及保存"(编号2023YFC2906901)联合资助的成果. （编号42172222）
