广西田林龙车乡陨铁的初步研究
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A Study on the Iron Meteorite in Longche Township, Tianlin County, Guangxi
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    摘要:

    本文对广西田林龙车乡陨铁熔壳、比重、硬度、矿物成分及化学成分进行了研究。通过光片镜下观察、电子显微镜、电子探针、穆斯堡尔谱、X-射线衍射、化学分析等测试手段,发现该陨铁主要由铁纹石、镍纹石、合纹石等组成,其次含少量磷铁镍矿,磁铁矿等。铁纹石呈板状,镍纹石呈条带状相间排列形成明显的维斯台登构造,属中粗粒八面体铁陨石。 用扫描电镜在陨铁的松散颗粒中发现较好的矿物雏晶,这是比较少见的。

    Abstract:

    The iron meteorite in Longche township is adout 36cm in length, 24cm in width and 20cm in thickness, with a weight of 97.5 kg. Its surface color is brown while its fresh fracture is gray-silver-colored. A lot of rounded melt cavities are found in the outer crust of this meteorite, together with clear melt crust and break-up faces. The melt crust is composed of microcrystalline magnetites. Using such means as electron microscope, electron probe, spectrum analysis, X-ray Mossbauer spectrum and chemical analysis, the authors have succeeded in identifying the minerals in the iron meteorite, which are mainly kamacite, taenite and plessite with less schreibersite and magnetite.In addi- lion, some fairly perfect crystallites can be seen under the scanning electron microscope. The chemical composition of the iron meteorite is; Fe 90.21%,Ni 7.78%, Co 0.43%,P 0.0131% and S 0.0255%(98.4586% total). Kamacite is tabular in form and is interIayered with taenite, forming the Widmanstatten structure. The thickness of the kamacite plate is 1.2一1,5mm, suggesting that this iron meteorite is of a medium-coarse-grained octahedral type .It experienced shock metamorphism during its flying in the space, which caused the meteoritic minerals to have apparent Neumann Lines. The zero-valence state of iron in the iron meteorite indicates that it was formed under a strong reduction condition.

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梁宝贤,李树岩,1988,广西田林龙车乡陨铁的初步研究[J].岩石矿物学杂志,7(2):184~188. Liang Baoxian,1988,A Study on the Iron Meteorite in Longche Township, Tianlin County, Guangxi[J]. Acta Petrologica et Mineralogica,7(2):184~188.

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