本文關(guān)鍵詞： 鐵隕石 X射線衍射 磁性測試 風化作用　出處：《巖石礦物學雜志》2014年S2期 　論文類型：期刊論文

【摘要】：本文對南丹IIICD鐵隕石的礦物學特征進行了研究,并與同為鐵隕石但化學分類不同的阿根廷IAB鐵隕石和西伯利亞IIB鐵隕石進行了對比,重點探討了風化作用對鐵隕石礦物學特征的影響。首先用偏光顯微鏡、靜水稱重、掃描電鏡觀察了樣品的基本礦物學特征和微形貌特征,然后用振動式樣品磁強計、X射線衍射與電子探針能譜半定量測試研究了樣品的磁學性質(zhì)、物相和化學組成。研究結(jié)果表明,南丹鐵隕石在較強的自然風化作用下,光澤變?nèi)鯙橥翣罟鉂?相對密度降低;風化產(chǎn)生的反鐵磁性物質(zhì)會使隕石的磁性下降;另外,樣品表面物相組成也發(fā)生較大變化,以針鐵礦(FeOOH)和磁鐵礦(Fe_3O_4)等鐵的次生礦物為主;但風化殼以下的礦物物相及化學成分均未發(fā)生明顯變化,以Fe、Ni為主的鐵紋石、鎳紋石物相存在。
[Abstract]:In this paper, the mineralogical characteristics of the IIICD iron meteorite in Nandan are studied and compared with the iron meteorites of Argentina IAB and Siberia IIB which belong to the same iron meteorites but have different chemical classification. The effect of weathering on the mineralogical characteristics of iron meteorites was discussed. Firstly, the basic mineralogical characteristics and micromorphology of the samples were observed by polarizing microscope, hydrostatic weighing and scanning electron microscope. The magnetic properties, phase and chemical composition of the samples were studied by X-ray diffraction and electron probe spectroscopy. Under the strong natural weathering, Nandan iron meteorite has a weak luster and a lower relative density. The antiferromagnetic material produced by weathering decreases the magnetism of meteorites. In addition, the surface phase composition of the samples also changed greatly, such as FeOOH (goethite) and Fe3O4 (magnetite). However, the mineral phase and chemical composition below the weathering crust did not change obviously.
【作者單位】： 造山帶與地殼演化教育部重點實驗室 北京大學地球與空間科學學院;中國地質(zhì)大學珠寶學院;
【分類號】：P185.83;P578.12
【正文快照】： 隕石指從宇宙空間降落到地球表面并保持其原對鐵隕石的影響并未提及。南丹鐵隕石本攜帶著重始結(jié)構(gòu)的固態(tài)物質(zhì)。據(jù)統(tǒng)計,每年降落到地球上的要的宇宙信息,但在降落后經(jīng)歷了近500年物理化隕石約有500個,降落到陸地上的隕石僅有150個學環(huán)境的變遷,礦物學特征已有所改變。為研究風

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