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- Title
桐柏造山带两侧剪切带构造关系讨论及地质意义.
- Authors
刘 欢; 霍海东
- Abstract
The Yindian-Malong shear zone and the Hongyihe-Tongbai shear zone on the north and south sides of the Tongbai orogenic belt are two important boundary zones separating the core complex and high-pressure metamorphic rock units. Observation, microstructural analysis, and quartz C-axis fabric EBSD (Electron Backscattered Diffraction) analysis revealed that the two shear bands have unified geometric and kinematic features, and the shear kinematic features are symmetric, reflecting the It may be the same shear band, which has the characteristic of movement extending in the nearly EW direction. The integrated shear zone is a detachment shear zone covering the Tongbai complex, which generally shows NWW trending movement of the hanging wall, and a large number of sheath folds and compressive strain L-shaped structures with hubs near EW direction developed in the lower part L tectonites, and a large number of SL structural rocks (namely, mylonite series rocks) mainly developed in the shear zone with flattening strain. A large number of nearly EW-trending linear structures in the present Tongbai orogenic belt may be derived from the tectonic activities of the extension of parallel orogenic belts. This geological feature of hanging wall shear detachment in the NWW direction is widely developed in the Dabie orogenic belt, reflecting that the Qinling-Tongbai-Dabie-Sulu orogenic belt in central-eastern China may have occurred in the middle-lower crust during the Early Cretaceous The tectonic evolution of near EW extension.
- Publication
East China Geology / Huadong dizhi, 2022, Vol 43, Issue 4, p514
- ISSN
2096-1871
- Publication type
Article
- DOI
10.16788/j.hddz.32-1865/P.2022.04.010