| 扫描电子显微镜对花岗岩中主要矿物裂隙作用的研究 |
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| 引用本文： | Moustafa El Omella 唐春安,张哲.扫描电子显微镜对花岗岩中主要矿物裂隙作用的研究[J].地质与资源,2004,13(3):129-136. |
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| 作者姓名： | Moustafa El Omella 唐春安 张哲 |
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| 作者单位： | 1. 东北大学岩石破裂诱发地震研究中心, 辽宁沈阳 110004;2. 苏伊士运河大学地质系, 埃及伊斯梅利亚市;3. 沈阳地质矿产研究所, 辽宁沈阳 110004 |
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| 基金项目： | ThisstudywassupportedbytheChinaScholarshipCouncil(GrantNo.160)，NationalNatureScienceFoundationofChina(GrantNo.400722006)andtheKeyTaskProjectofScienceandTechnologyofLiaoningProvince(GrantNo.2001230001).1 |
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| 摘 要： | 微裂隙对于岩石的物理性质有重要影响.通过光学显微镜对显微裂隙进行的观察,难以将薄片的制作过程中产生的裂隙同自然裂隙区分;其次,观测的裂隙大小限制在0.1mm或以上数量级,一些重要细节观察不到.扫描电镜的高放大倍数和三维分辨率使其成为适合于裂隙研究的理想工具.利用扫描电镜观测了浙江花岗岩在室温下由51.6MPa压力产生的裂隙的发育过程.观察花岗岩的表面以研究其微裂隙和矿物的解理、晶形及破裂作用.微裂隙分为3种类型:晶体内裂隙(完全发育在颗粒内部),晶体间裂隙(穿过颗粒边界进入其他颗粒中),颗粒边界裂隙(沿颗粒边界发育或与边界重合).本研究中的花岗岩为中-粗粒(1~6mm),经过蚀变,约含40%斜长石,25%钾长石,25%石英,10%镁铁矿物(主要为黑云母和白云母).
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| 关 键 词： | 花岗岩 矿物裂隙 扫描电子显微镜(SEM) |
| 收稿时间： | 2003-09-11 |
SCANNING OF ESSENTIAL
MINERALS IN GRANITE ELECTRON MICROSCOPE STUDY ON THE MICROFRACTURE BEHAVIOR |
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| Abstract.SCANNING OF ESSENTIAL
MINERALS IN GRANITE ELECTRON MICROSCOPE STUDY ON THE MICROFRACTURE BEHAVIOR[J].Geology and Resources,2004,13(3):129-136. |
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| Authors: | Abstract |
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| Institution: | 1. Center for Rockbursts and Induced Seismicity Research, Northeastern University, Shenyang 110004, China;2. Geology Department, Suez Canal University, Egypt;3. Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China |
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| Abstract: | Granitic samples from Zhejiang Province, Southeast of China, were tested in a uniaxial condition to failure at constant confining pressure. It is found from careful Scanning Electron Microscope (SEM) observations that fractures form the intersection or coalescence of microcavities. Granite consists of three major minerals, Quartz, feldspar (K feldspar &Plagioclase) and biotite. The cracks in various minerals of the specimen develop differently; this obvious difference in crack patterns is believed to result from the nature of their microstructures. Careful observation shows that quartz display brittle and isotropic crack while feldspar and biotite exhibit anisotropic cracks and the separating of their cleavage planes (cleavage cracks) is the one of the major failure forms of biotite and feldspar. From the tectonic point of view, the granite has been strongly deformed and hydrothermally altered; such hydrothermal fluids may be keep the system open for fluid movement to cause alteration metasomatism of granite. |
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| Keywords: | granite microfracture of minerals scanning electron microscope(SEM) |
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