元阳铁陨石的矿物岩石学和微量元素地球化学研究

发布时间：2018-01-21 02:06

本文关键词： 天体化学方法实验室方法数据分析仪器电子探针　出处：《天文学报》2016年05期 　论文类型：期刊论文

【摘要】：元阳铁陨石是2010年在云南省元阳县山区发现的,其内部的主要矿物为铁纹石和镍纹石,铁纹石的含量很高(约占80%),镍纹石的含量较低.铁纹石中Ni含量为4.88 6.21wt%,镍纹石中Ni含量为26.13 50.27 wt%.副矿物有陨磷铁镍石、闪锌矿和氮铬矿.陨磷铁镍石存在大、小两种颗粒,具有颗粒越大Ni含量越低的特点.元阳铁陨石中没有发现硅酸盐包体.由于经受了地表风化蚀变作用,样品边缘以及铁纹石裂隙间都发生了氧化.元阳铁陨石中铁纹石的条带宽度较粗,属于粗粒八面体结构.中子活化分析结果显示:元阳铁陨石的Ni(7 wt%)和Au(1.565 ppm)的含量都相对较低,和IAB-MG(IAB-Main group)群的铁陨石在化学成分上具有相似性,属于IAB-MG群.相对于其他IAB-MG群铁陨石,元阳铁陨石的Ir(1.00 ppm)含量偏低,这可能是由于其母体中富含Ir的矿相在冲击作用下并没有完全熔融.
[Abstract]:In 2010, Yuanyang iron meteorite was found in the mountainous area of Yuanyang County, Yunnan Province. The main minerals in the meteorite are ferrite and nickel striate, and the content of ferrite is very high (about 80%). The content of nickel grain stone is relatively low. The content of Ni in ferrite is 4.88 ~ 6.21 wts. the content of Ni in nickel striate is 26.13 ~ 50.27 wt.The secondary minerals are meteorite ferric nickel. Sphalerite and azo chromium ore. There are two kinds of granulite, large and small, with the characteristics that the larger the grain is, the lower the Ni content. No silicate inclusions have been found in the Yuanyang iron meteorite, which has undergone surface weathering and alteration. Oxidation took place at the edge of the sample and between the fissures of the ironstone. The width of the stripe of the iron stripe in the Yuanyang iron meteorite is relatively wide. It belongs to coarse octahedral structure. The results of neutron activation analysis show that the contents of Ni(7 WTM and Au(1.565 ppm of Yuanyang iron meteorite are relatively low. The iron meteorites of the IAB-MG(IAB-Main group are similar in chemical composition and belong to the IAB-MG group, compared with other iron meteorites of the IAB-MG group. The Ir(1.00 PPM) content of the ferric meteorite in Yuanyang is low, which may be due to the fact that the iron-rich ore facies in its parent body were not completely melted under impact.
【作者单位】：中国科学院紫金山天文台;中国科学院行星科学重点实验室;中国科学院大学;澳门科技大学太空科学研究所;
【基金】：国家自然科学基金项目(41273079,41573059) 紫金山天文台小行星基金会资助
【分类号】：P185.83
【正文快照】： 1引言铁陨石主要由铁纹石、镍纹石组成,含少量的硫化物、磷化物和碳化物,少数铁陨石中还包含有硅酸盐包体.前人根据铁陨石中的铁纹石条带的宽度,将铁陨石分为六面体、八面体和富镍无结构3大类[1],其中八面体铁陨石又可以细分为极粗粒、粗粒、中粒、细粒、极细粒、过渡体6个亚

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