江南东部造山带的挤压及其对华南地块韧性变形过程和区域构造的影响

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Jun Hu , Xinqi Yu , Wenjiao Xiao , Wei Li
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引用次数: 0

摘要

早古生代江南造山带东部的转折变形是长江-加泰罗尼亚地块斜向汇聚的构造反应,这种关系对于理解华南构造至关重要。江湾-黄山剪切带(JHSZ)和百济-山阳剪切带(BSSZ)分别表现为NEE-SSW走向的斜向右旋剪切和正弦剪切,其演化导致了局部的E-W向右旋走向的走向滑动剪切。大多数运动涡度值在0.4至0.81之间,这意味着JHSZ和BSSZ在纯剪切和简单剪切成分的作用下发生变形,表明这些造山剪切带的变形历史比较复杂。石英和长石的变形机制、开口角和石英c轴织构的晶格优选取向(LPO)模式表明,江南造山带东部的剪切变形温度在400-550 °C之间。局部变形发生在高温(600 °C)条件下。结合以往的资料和区域地质,这些发现表明,江南造山带东部的剪切变形容纳了早古生代期间长江块体和国泰块体之间的斜向汇聚,这可能是冈瓦纳最终组装造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transpression in the Eastern Jiangnan Orogen and its implications for ductile deformation process and regional Tectonics of the South China block

The transpressive deformation in the eastern Jiangnan Orogen during the Early Paleozoic is the structural response to the oblique convergence of the Yangtze-Cathaysia blocks, and this relationship is critical for understanding the tectonics of South China. The Jiangwan–Huangshan shear zone (JHSZ) and Baiji–Sanyang shear zone (BSSZ) exhibit NEE–SSW-trending oblique dextral and sinistral shearing, respectively, and their evolution resulted in local E–W dextral strike-slip shearing. Most kinematic vorticity values range from 0.4 to 0.81, which implies that the JHSZ and BSSZ deformed under the contribution of both pure-shear and simple-shear components, suggesting complicated deformation histories for those orogenic shear zones. The quartz and feldspar deformation mechanisms, opening angles and lattice preferred orientation (LPO) patterns of the quartz c-axis fabrics suggest shear deformation temperatures between 400 and 550 °C in the eastern Jiangnan Orogen. Locally deformation occurred under high-temperature (>600 °C) conditions. Combined with previous data and regional geology, these findings indicate that the shearing deformation in the eastern Jiangnan Orogen accommodated the oblique convergence between the Yangtze and Cathaysia blocks during the Early Paleozoic, which was possibly caused by the final assembly of Gondwana.

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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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