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学科主题: Geochemistry & Geophysics
题名: Magnetic fabric study across the Ailao Shan-Red River shear zone
作者: Zhou, Y ; Zhou, P ; Wu, SM ; Shi, XB ; Zhang, JJ
关键词: anisotropy of magnetic susceptibility ; Ailao Shan-Red River shear zone ; degree of deformation ; deformation mode
刊名: TECTONOPHYSICS
发表日期: 2002-01-01
卷: 346, 期:40606, 页:137-150
收录类别: sci
部门归属: Acad Sinica, LTE, Inst Geol & Geophys, Beijing 100029, Peoples R China; China Univ Geosci, Grad Sch, Beijing 100083, Peoples R China; Acad Sinica, Inst Oceanog S China Sea, Guangzhou 510301, Peoples R China; Peking Univ, Beijing 100871, Peoples R China
项目归属: 海洋地质
摘要: The anisotropy of magnetic susceptibility (AMS) of 351 specimens from 51 sites across the Ailao Shan-Red River shear zone (ASRR) was measured to determine its magnetic fabric. Rocks range westward from core schistose gneiss, through lowgrade schist, to Triassic sediment. Magnetic ellipticity analysis shows that 41 of 51 sites have an oblate compressional fabric and the other 10 sites have a prolate fabric. P-j value drops by 22.4% in the low-grade schist and by 27.4% in the Triassic sediment on average with respect to the gneiss, suggesting a rapid decrease of deformational intensity. The directions of principal susceptibilities are closely related to the deformation of the Ailao Shan-Red River shear zone. The susceptibility plane always coincides with the schistosity or cleavage plane, Most of the maximum susceptibility axes trend NW-SE. In the shear zone, the maximum susceptibility axes (K-max) are parallel to the lineation within the foliation plane. With increasing distance from the shear zone, there is a trend that they become parallel to the down-dip of reverse faults or cleavage, This indicates changes in deformation mode, inside and outside the shear zone. Within the shear zone, horizontal movement is dominant. Outside, shortening prevails. The overall minimum magnetic axes align NE-SW with subhorizontal to low dip angles, suggesting that the dominant shortening is NE-SW directed. Caution should be exercised when AMS is used to determine shear sense in strong shear zones because the angle between the minimum susceptibility axis (K-min) and pole of foliation is small, and also because the attitude of foliation varies from place to place. They result in unreliable or even wrong shear sense. Another important result is the axial ratio of magnetic susceptibility ellipsoid along the study section. With these data, it is possible to establish an axial ratio relationship between the finite strain ellipsoid and magnetic susceptibility ellipsoid for quantitative calculation of offset. (C) 2002 Elsevier Science B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4718
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Zhou, Y; Zhou, P; Wu, SM; Shi, XB; Zhang, JJ.Magnetic fabric study across the Ailao Shan-Red River shear zone,TECTONOPHYSICS,2002,346(40606):137-150
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