Subducted iron and glassy spherules in the upper mantle?

IF 0.5 4区地球科学 Q4 GEOLOGY Boletin De La Sociedad Geologica Mexicana Pub Date : 2022-12-13 DOI:10.18268/bsgm2022v74n3a200722

J. González-Jiménez, I. Sergeeva, T. Kerestedjian, F. Gervilla

引用次数: 0

Abstract

Spherules are documented in ophiolitic mantle rocks such as peridotites and associated chromitites. They consist of: (1) native iron having variable amounts of Ni with/without inclusions of silicate glass or oxides (wüstite), (2) dendritic intergrowth of oxides (magnetite, wüstite and hematite) with/without silicate glass and, (3) silicate glass. Consensually, they are interpreted as indigenous to chromitites and related with high-temperature processes operating in the Earth’s upper mantle. However, their similarity with terrestrial and extraterrestrial spherules found in other settings of the geological record is remarkable. We raise the question on such indigenous origin, relating them to volcanic and cosmic material recycled back to the mantle wedge where chromitites form during subduction.

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上地幔的俯冲铁和玻璃球?

在蛇绿质地幔岩石中，如橄榄岩和伴生的铬铁矿中记录了球粒。它们由:(1)含有不同数量镍的天然铁(含/不含硅酸盐玻璃或氧化物(w石))，(2)氧化物(磁铁矿、w石和赤铁矿)枝晶共生，含/不含硅酸盐玻璃，(3)硅酸盐玻璃。普遍认为，它们被解释为铬铁矿的原生产物，并与地球上地幔的高温过程有关。然而，它们与在地质记录的其他环境中发现的地球和地外球体的相似性是显著的。我们提出了这种原生起源的问题，将它们与火山和宇宙物质联系起来，这些物质在俯冲过程中被回收到地幔楔中形成铬铁矿。

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来源期刊

Boletin De La Sociedad Geologica Mexicana GEOLOGY-

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

50 weeks

期刊介绍： The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers. We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.