本文關(guān)鍵詞： 天體化學(xué) 方法 實(shí)驗(yàn)室 方法 數(shù)據(jù)分析 儀器 電子探針　出處：《天文學(xué)報(bào)》2016年05期 　論文類型：期刊論文

【摘要】：元陽(yáng)鐵隕石是2010年在云南省元陽(yáng)縣山區(qū)發(fā)現(xiàn)的,其內(nèi)部的主要礦物為鐵紋石和鎳紋石,鐵紋石的含量很高(約占80%),鎳紋石的含量較低.鐵紋石中Ni含量為4.88 6.21wt%,鎳紋石中Ni含量為26.13 50.27 wt%.副礦物有隕磷鐵鎳石、閃鋅礦和氮鉻礦.隕磷鐵鎳石存在大、小兩種顆粒,具有顆粒越大Ni含量越低的特點(diǎn).元陽(yáng)鐵隕石中沒(méi)有發(fā)現(xiàn)硅酸鹽包體.由于經(jīng)受了地表風(fēng)化蝕變作用,樣品邊緣以及鐵紋石裂隙間都發(fā)生了氧化.元陽(yáng)鐵隕石中鐵紋石的條帶寬度較粗,屬于粗粒八面體結(jié)構(gòu).中子活化分析結(jié)果顯示:元陽(yáng)鐵隕石的Ni(7 wt%)和Au(1.565 ppm)的含量都相對(duì)較低,和IAB-MG(IAB-Main group)群的鐵隕石在化學(xué)成分上具有相似性,屬于IAB-MG群.相對(duì)于其他IAB-MG群鐵隕石,元陽(yáng)鐵隕石的Ir(1.00 ppm)含量偏低,這可能是由于其母體中富含Ir的礦相在沖擊作用下并沒(méi)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.
【作者單位】： 中國(guó)科學(xué)院紫金山天文臺(tái);中國(guó)科學(xué)院行星科學(xué)重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);澳門(mén)科技大學(xué)太空科學(xué)研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41273079,41573059) 紫金山天文臺(tái)小行星基金會(huì)資助
【分類號(hào)】：P185.83
【正文快照】： 1引言鐵隕石主要由鐵紋石、鎳紋石組成,含少量的硫化物、磷化物和碳化物,少數(shù)鐵隕石中還包含有硅酸鹽包體.前人根據(jù)鐵隕石中的鐵紋石條帶的寬度,將鐵隕石分為六面體、八面體和富鎳無(wú)結(jié)構(gòu)3大類[1],其中八面體鐵隕石又可以細(xì)分為極粗粒、粗粒、中粒、細(xì)粒、極細(xì)粒、過(guò)渡體6個(gè)亞

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