Framboidal iron oxide: Chondrite-like material from the black mat, Murray Springs, Arizona

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• 作者：Mostafa Fayek^a ; ^{fayek@cc.umanitoba.ca} ; Lawrence M. Anovitz^b ; Lawrence F. Allard^c ; Sharon Hull^d
• 关键词：Younger-Dryas ; Clovis ; meteorite ; framboids ; chondrite ; black-mat
• 刊名：Earth and Planetary Science Letters
• 出版年：2012
• 期刊代码：18_0012821x
• 类别：ph
• 出版时间：15 February, 2012
• 卷：319-320
• 期：Complete
• 页码：251-258
• 文件大小：1184 K

摘要

At the end of the Pleistocene a Younger Dryas 鈥渂lack mat鈥?was deposited on top of the Pleistocene sediments in many parts of North America. A study of the magnetic fraction (~ 10,900 卤 50 B.P.) from the basal section of the black mat at Murray Springs, AZ revealed the presence of amorphous iron oxide framboids in a glassy iron-silica matrix. These framboids are very similar in appearance and chemistry to those reported from several types of carbonaceous chondrites. The glass contains iron, silicon, oxygen, vanadium and minor titanium, while the framboidal particles contain calcium as well. The major element chemistry of both the spherules and the glass matrix are consistent with the chemistry of material associated with meteorite impact sites and meteorites. Electron microscopy confirms that the glassy material is indeed amorphous, and also shows that what appear to be individual oxide particles are amorphous as well. The latter appears consistent with their overall morphology that, while euhedral, typically shows significant fracture. Based on these data, we argue that these particles are the product of a hypervelocity impact.