中国中东部中生代古构造应力场特征与背景
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本文为中国地质调查局项目(编号DD20221646)、中国科技部重点研发项目(编号2023YFF0803302)、国家自然科学基金项目(编号U2344215)和中国地质科学院基本科研业务费专项(编号JKYZD202309)联合资助的成果


Characteristics of paleo- stress field of eastern- central Chinese continent and their tectonic implication
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    摘要:

    中生代是中国中东部重要的演化阶段,发育有不同阶段鲜明和丰富的陆内变形。通过统计分析基于断层滑动矢量反演得到的古构造应力场数据,进一步细化了前人关于中国东部古构造应力场的划分方案,将我国中东部的中生代演化划分为4个阶段,即中、晚三叠世、中侏罗世—早白垩世、早白垩世、早白垩世末—晚白垩世初。古构造应力场区域性特征可以用来约束主要构造阶段的环境与背景。统计表明,中、晚三叠世北方以近南北向缩短为主而南方由于旋转以及多板块的作用,显示不同方向的古构造应力场,三叠纪早期还发育有不同性质的韧性变形,古亚洲洋关闭后的陆内变形、华北与扬子板块的碰撞、扬子与印支地块的碰撞以及东、西华夏地块之间的作用是导致不同地区不同变形以及不同古构造应力场的背景;中侏罗世—早白垩世在总体一致的西北西- 东南东向区域应力场条件下,叠加了蒙古- 鄂霍茨克造山带的作用,同期的古太平洋板块低角度的俯冲是主控因素;早白垩世的区域性北西- 南东向伸展指示具有一致的背景,古太平洋板块的回撤可能是主控因素;早白垩世末—晚白垩世初在中国中东部存在一期短暂的北西- 南东向缩短,从南向北,变形的时代依次变年轻,指示欧亚大陆东缘存在一期从南至北的构造作用,可能与外来地块的碰撞作用有关。中国中东部中生代的陆内演化或者变形与不同时代来自不同方向的板缘作用有重要关系,当然也不排除其他因素的可能性。

    Abstract:

    The Mesozoic period is an important phase for central- eastern China, characterized by multistage, distinct, and abundant intracontinental deformation. According to statistical analysis of paleo- stress data retrieved from fault slip vectors, the Mesozoic tectonic evolution in central- eastern China can be divided into four stages: Middle- Late Triassic, Middle Jurassic- Early Cretaceous, Early Cretaceous, and latest Early Cretaceous- early Late Cretaceous, which further refined the previous division. Regional paleo- stress patterns are crucial for outlining the tectonic settings of major tectonic stages. Statistical analysis reveals that during the Middle- Late Triassic, northern China experienced north- south compression, while southern China exhibited various paleo- stress directions due to the rotation and tectonics of multiple plates. Additionally, ductile deformation with varying kinematics also developed during the Early Triassic. These distinct deformation and paleo- stress patterns across different regions were driven by intracontinental deformation processes, initiated by the closure of the Paleo- Asian Ocean, the collision between the North China Craton and the Yangtze Craton, the collision between the Yangtze Craton and Indochina Block, and tectonic interactions between the eastern and western Cathaysia blocks. During the Middle Jurassic to Early Cretaceous, the regional paleo- stress field was characterized by west- northwest to east- southeast compression, which dominantly resulted from the low- angle subduction of the Paleo- Pacific Plate, superimposed by the Mongol- Okhotsk Orogeny. The Early Cretaceous regional northwest- southeast extension indicates a consistent tectonic setting, which may be mainly controlled by the retreating subduction of the Paleo- Pacific Plate. In the latest Early Cretaceous to early Late Cretaceous, central- eastern China experienced a short- term northwest- southeast compression, with deformation times gradually shifting from south to north. This indicates a tectonism migration from south to north along the eastern margin of Eurasia, possibly triggered by a collision with an unknown block against East Asia. The Mesozoic intracontinental deformation, or tectonic evolution, in central- eastern China was dominantly controlled by far- field effects of plate margins with different orientations across periods. However, other potential factors may contribute to the observed tectonic evolution, which remain to be fully explored.

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引用本文

张进,张北航,赵衡,刘玉刚,江海,曲军峰,王振义,张义平,赵硕.2025.中国中东部中生代古构造应力场特征与背景[J].地质学报,99(1):78-103.
ZHANG Jin, ZHANG Beihang, ZHAO Heng, LIU Yugang, JIANG Hai, QU Junfeng, WANG Zhenyi, ZHANG Yiping, ZHAO Shuo.2025. Characteristics of paleo- stress field of eastern- central Chinese continent and their tectonic implication[J]. Acta Geologica Sinica,99(1):78-103.

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  • 收稿日期:2024-08-21
  • 最后修改日期:2024-11-05
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  • 在线发布日期: 2024-12-18
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