再论韧性剪切带运动学涡度分析
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本文为国家自然科学基金资助项目(编号:42430309、42172246)的成果


Further discussion of kinematic vorticity analysis in ductile shear zone
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    摘要:

    运动学涡度分析是确定韧性剪切带中纯剪切与简单剪切组分相对占比的重要方法,近十余年来的深入研究取得了重要进展。笔者等回顾了5种创新性方法的应用情景、不同类型剪切带的运动学涡度时空变化特征以及应变量与运动学涡度的相关性,取得了如下认识:这些创新性方法在特定场景下的运动学涡度分析中具有关键价值:将椭圆亚晶粒法、Rxz/δ法与斜向叶理相关传统方法联用可更精细地约束韧性变形晚期运动学涡度变化;3D应变椭球法和磁面理法在缺乏实际标志体时可作为传统方法的替代;CVA分析法是确定VNS,判断剪切型式与识别多期变形的有效手段。通过分析运动学涡度时空变化可获得不同类型剪切带的变形路径与变形分解特征:伸展拆离型剪切带多表现先加速后减速变形型式,靠近拆离断层面运动学涡度增大或减小;逆冲型剪切带多表现减速变形型式,靠近逆冲断层面运动学涡度增大;走滑型剪切带先加速后减速与减速变形型式均较常见,多表现为中心运动学涡度较两侧增大或者从一侧向另一侧运动学涡度逐渐增大。另一方面,应变量和运动学涡度的相关性显著受剪切带类型及伴随地质过程影响:伸展拆离剪切带中若应变主要由岩浆底辟与垂向隆升作用贡献两者多为负相关,若应变主要由拆离断层活动贡献则两者多为正相关;逆冲型剪切带中两者多为正相关;走滑型剪切带中两者多为正相关,若应变主要由挤压作用贡献则两者多为负相关。未来研究需在方法选择的全面性、区域尺度运动学涡度分析、沿走向运动学涡度变化解析以及物理和数值模拟手段的应用等方面加强工作。

    Abstract:

    Kinematic vorticity analysis is a crucial method for determining the relative proportions of pure shear and simple shear components in ductile shear zones, significant advances have been achieved in in- depth research over past decade.This paper reviews five innovative approaches for kinematic vorticity analysis, spatio- temporal variations in kinematic vorticity and the correlation between strain and kinematic vorticity in different shear zone types. The following insights are obtained: These innovative methods are of great importance in some special circumstance: Combining ellipsoid subgrain analysis and Rxz/δ methods with traditional oblique foliation techniques allows finer constraints on late- stage kinematic vorticity changes; 3D strain ellipsoid methods and magnetic foliation method serve as important alternatives when actual markers are absent; CVA analysis helps identify the VNS, determine shear type and recognize polyphase deformation. We can aquire the deformation path and deformation partitioning characteristic in different kinds of shear zones by analysing the spatio- temporal variations in kinematic vorticity: detachment shear zones typically exhibit an accelerate- decelerate deformation path, with increasing or decreasing vorticity toward the detachment plane; Thrust shear zones generally show a decelerate deformation path, with vorticity increasing toward the thrust plane; Strike- slip shear zones may display either accelerate- decelerate or decelerate patterns, often with higher vorticity at the center or gradual lateral variations. Besides,the types of shear zones and accompanying geological processes can influence the correlation between strain and kinematic vorticity:In detachment shear zones, if the strain is contributed by magma diapir and vertical exhuming, the correlation between strain and kinematic vorticity is predominantly negative; If the strain is contributed by activation of the detachment fault, the correlation between strain and kinematic vorticity is predominantly positive . In thrust zones, the correlation is commonly positive. In strike- slip shear zones, the correlation is generally positive, but it becomes negative if the strain is predominantly contributed bycompressive component. Future research should strengthen efforts in the comprehensiveness of method selection, regional- scale kinematic vorticity analysis, interpretation of kinematic vorticity variations along the strike, and the application of physical and numerical simulation methods.

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李泽宇,刘俊来.2026.再论韧性剪切带运动学涡度分析[J].地质论评,(1):2026010023,[DOI].
LI Zeyu, LIU Junlai.2026. Further discussion of kinematic vorticity analysis in ductile shear zone[J]. Geological Review,(1):2026010023.

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  • 收稿日期:2025-11-19
  • 最后修改日期:2026-01-28
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  • 在线发布日期: 2026-02-12
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