Löpönvaara: A new phosphorus-rich iron meteorite from Finland

IF 2.4 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Laura Kotomaa, Markku Väisänen, Jussi S. Heinonen, Ermei Mäkilä, Hugh O'Brien, Arto Peltola
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Abstract

Löpönvaara is a rare new phosphorus-rich iron meteorite find from Löpönvaara, Finland. The ~164 g meteorite was discovered in 2017 from the same area as the ungrouped Lieksa pallasite. Löpönvaara was classified as an ungrouped iron meteorite due to its unusually high concentration of P (>4 wt%), coupled with a moderate concentration of Ni (~11 wt%), and Ga–Ge abundances in the “III” range. The meteorite consists of ~75 vol% kamacite and ~22 vol% schreibersite, with accessory troilite (<0.1 vol%), and minor terrestrial weathering products. The kamacite in Löpönvaara occurs as three different types: (1) rare, large 2–5 mm partially resorbed clasts; (2) round, ≤0.5 mm partially resorbed clasts; and (3) small, several tens of μm to sub-μm exsolution blebs and globules in the matrix. Schreibersite occurs solely as microscopic matrix material in between the type (1) and (2) kamacite clasts. The lack of taenite and the overall compositional and textural features of Löpönvaara suggest that it retained its composition possibly from a P-rich portion of immiscible melt at late stages of fractional crystallization, but its textural features suggest that the meteorite suffered impact-related metamorphism. The meteorite has no close textural or compositional affinities, which makes it unique and an important target for future studies.

Abstract Image

Löpönvaara:来自芬兰的一颗新的富磷铁陨石
Löpönvaara是芬兰Löpönvaara发现的一颗罕见的新富磷铁陨石。这颗重约164克的陨石是在2017年与未分类的Lieksa pallasite在同一地区发现的。Löpönvaara由于其异常高浓度的P (>4 wt%),加上中等浓度的Ni (~11 wt%),以及在“III”范围内的Ga-Ge丰度,被归类为未分类的铁陨石。该陨石由~75 vol%的绢云母岩和~22 vol%的晶长石组成,伴生有<;0.1 vol%的绢云母岩和少量的陆地风化产物。Löpönvaara的绢云母岩主要有三种类型:(1)罕见的2 ~ 5 mm大的部分再吸收碎屑;(2)圆形,≤0.5 mm部分再吸收碎屑;(3)基体中存在数十μm至亚μm的小气泡和小球。在(1)型和(2)型卡玛石碎屑之间,schreiberite仅作为微观基质物质存在。Löpönvaara缺少带长石,其整体组成和结构特征表明其成分可能来自于分离结晶后期非混溶熔体的富p部分,但其结构特征表明该陨石遭受了撞击相关的变质作用。该陨石没有紧密的结构或成分亲和力,这使得它成为未来研究的重要目标。
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来源期刊
Meteoritics & Planetary Science
Meteoritics & Planetary Science 地学天文-地球化学与地球物理
CiteScore
3.90
自引率
31.80%
发文量
121
审稿时长
3 months
期刊介绍: First issued in 1953, the journal publishes research articles describing the latest results of new studies, invited reviews of major topics in planetary science, editorials on issues of current interest in the field, and book reviews. The publications are original, not considered for publication elsewhere, and undergo peer-review. The topics include the origin and history of the solar system, planets and natural satellites, interplanetary dust and interstellar medium, lunar samples, meteors, and meteorites, asteroids, comets, craters, and tektites. Our authors and editors are professional scientists representing numerous disciplines, including astronomy, astrophysics, physics, geophysics, chemistry, isotope geochemistry, mineralogy, earth science, geology, and biology. MAPS has subscribers in over 40 countries. Fifty percent of MAPS'' readers are based outside the USA. The journal is available in hard copy and online.
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