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学科主题: Geochemistry & Geophysics
题名: Study on finite strain and its relationship with magnetic fabric along Ailao Shan-Red River shear zone
作者: Zhou, Y ; Wu, SM ; Qiu, XL ; Zhou, P
关键词: finite strain ; anisotropy of magnetic susceptibility ; relationship between petrofabric and magnetic fabric ; Ailao Shan-Red River shear zone
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
发表日期: 2003
卷: 108, 期:B10, 页:-2479
收录类别: sci
部门归属: Acad Sinica, Inst Geol & Geophys, LTE, Beijing 100029, Peoples R China; China Univ Geosci, Grad Sch, Beijing 100083, Peoples R China; Acad Sinica, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
摘要: [1] The finite strain along Ailao Shan-Red River shear zone has been studied. The axial ratios of strain markers and shear strains vary greatly, arising principally from deformation intensity and from contrasting competencies. Ellipticity of chloritic amygdales in basalt ranges from 6.79 to 10.47 (corresponding shear strain gamma(xz) = 2.22-2.93), and ellipticity of garnets from 1.56 to 2.95 (gamma(xz) = 0.45-1.14) in core gneiss. The S-C angle of the sheared rocks varies from 2degrees to 28degrees (gamma(sc) = 1.35-28.60), mostly in a range 2degrees to 7degrees. Optical observation, thermal demagnetization, and hysteresis curves were conducted to determine the nature of minerals and the contribution of paramagnetic and ferromagnetic minerals to magnetic susceptibility. The result shows that ferromagnetic minerals and hornblende dominate the magnetic fabric of samples with high to very high susceptibility, and play an important role in the magnetic fabric of samples with low to intermediate susceptibility. The ferromagnetic minerals are mainly pseudo-single-domain and multidomain Ti-poor magnetite. Most samples have their magnetic lineation lying between the C and S surfaces. In the remaining samples, deviations from this common alignment principally resulted from the magnetic minerals being deflected by porphyroclasts, mineral cleavage, and cracks. The axial ratio correlation is very poor between the magnetic and actual or imaginary strain ellipsoid calculated from the S-C fabric. This poor correlation suggests that the shape of the finite strain ellipsoid cannot be evaluated using the magnetic fabric when the latter is a combined result from multiple minerals, and especially when the shape effect of multidomain titanomagnetite is important.
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WOS记录号: WOS:000186090100007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4748
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhou, Y; Wu, SM; Qiu, XL; Zhou, P.Study on finite strain and its relationship with magnetic fabric along Ailao Shan-Red River shear zone,JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2003,108(B10):-2479
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