中国大陆科学深钻主孔中FeCrNi合金球粒的发现  

The discovery of FeCrNi spherules from the main hole of CCSD

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作  者:任玉峰[1] 方青松[1] 白文吉[1] 杨经绥[1] 戎合[1] 颜秉刚[1] 张仲明[1] 许志琴[1] 

机构地区:[1]国土资源部大陆动力学重点实验室,中国地质科学院地质研究所,北京100037

出  处:《岩石矿物学杂志》2005年第5期485-488,共4页Acta Petrologica et Mineralogica

基  金:国家重点基础研究发展规划(973)项目(2003CB716503);国家自然科学基金重大项目(40399143)

摘  要:在中国大陆科学深钻主孔中发现了2粒FeCrNi合金球粒,粒径约200μm,其中w(Fe)=71.07%~73.68%,w(Cr)=14.55%~16.79%,w(Ni)=9.91%~11.47%,总和为98.2%~99.65%,分子式为Fe0.74Cr0.16Ni0.10.球粒内均含氧化物包体,由Cr、Mn、Al、Si、Fe、Ti和O组成.X射线衍射分析表明,FeCrNi球粒为多晶,具立方晶系的晶体结构,空间群为Fm3m,晶胞参数为a=0.3603 m,Z=4,密度为7.828 g/cm3.球粒经抛光后呈银灰色,金属光泽,平均莫氏硬度为4.026,主波长S546反射率为56%.球粒可能是FeCrNi合金组成的金属熔融液滴冷却的产物.Two FeCrNi spherules were discovered in the main hole of CCSD. They are about 200μm in size. Their chemical compositions are Fe 71.07 % - 73.68 %, Cr 14.55 % - 16.79 % and Ni 9.91% - 11.47 %, totally 98.2 % - 99.65 %. The spherules contain oxide inclusions, with elements of Cr, Mn, Ti, AI, Fe, Si, and O. X-ray diffraction analysis shows that the spherules, having molecular formula of Fe0.74Cr0.16Ni0.10, is polycrystalline and of the cubic system, with space group of Fm3m, cell parameter of α = 0. 360 3 nm, Z = 4 and density of 7. 828 g/cm^3. The polished faces of the spherules are white gray in color and have metallic luster. The hardness of the spherules is about 4.026Hm. The reflectance of spherule is 56% -63%, with S546 of 56%. The spherules were probably produced by cooling of melted FeCrNi metallic droplets which trapped oxygen and was thus oxidized.

关 键 词:FeCrNi合金 球粒 中国大陆科学深钻 东海 

分 类 号:P575[天文地球—矿物学]

 

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