| 菱形石香肠简单剪切成因模式及其构造流变计 |
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| 关键词:rhombic boudins simple shear rheology gauge |
| 基金项目:国家自然科学基金项目“香肠构造流变计研究”(编号:49972068) |
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| 摘要: |
| Simple Shear Mode and Rheology Gauge of Rhombic Boudins |
| Rhombic boudins are commonly used as shear sense indicators, but their development and rheologic significance are incompletely understood. Pure shear mode as a considered formation mode suggests that rhombic boudins may form under the simple shear mechanism. Based on rheologic contrast between matrix and boudins, this paper presents a simple shear mode of rhombic boudins, sets up a simple and intuitional plane model with square boudins embedded in square matrix, resolves the distortion associated with simple shear into rotation and pure shear by geometry of finite deformation, and then calculates shear angle of rhombic boudins and rotation angle of the layer, with the two angles close to the results of finite element numerical modeling. Further theoretical analysis provides a method for estimating the viscous ratio of rhombic boudins to their matrix by means of geometrical parameters of rhombic boudins (shear angle and rotation angle of the layer), namely, rheology gauge of rhombic boudins. It was applied to the calculation of the viscous ratio of a boudin to its matrix, and the result was 4.76 in Tieshan, Hubei. Thus the adapted range of rheology gauge is expanded, and a way is introduced to measure and compute the viscous ratio of rocks swiftly in the field. |
| ZHANG Zhi-yong,ZENG Zuo-xun.2006.Simple Shear Mode and Rheology Gauge of Rhombic Boudins[J].Acta Geoscientica Sinica,27(6):537-542. |
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