Mineralogy, geochemistry and classification of the new Smolenice iron meteorite from Slovakia

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Geologica Carpathica Pub Date : 2020-06-01 DOI:10.31577/geolcarp.71.3.2

Milan Gargulák, D. Ozdín, P. Povinec, S. Strekopytov, A. Jull, I. Sýkora, V. Porubčan, S. Farsang

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Abstract

A single 13.95 kg mass of a slightly weathered iron meteorite was found in the forest near Smolenice (48°31.2’N, 17°23.9’E; Trnava County, Slovakia). The bulk chemical composition (in wt. %) is: Fe 88.78, Ni 8.16, Co 0.38, P 0.05, S<0.006 and (in μg/g): Ge<0.18, Ir 1.67, Ga 1.80, Cr 87.3, Cu 135.1, As 4.52, Mo 5.82, Sn 1.53, W 0.56, Re 0.18, Ru 3.56, Rh 0.90, Pd 4.12, Pt 5.35, Au 1.19, Zn<5, B<0.68, Pb<0.06. Bulk geochemistry, and Ni, Ga, Ge and Ir contents in particular suggest that the meteorite is an octahedrite belonging to the IVA group. The average thickness of kamacite lamellae is 0.22 mm, ranking it as fine octahedrite (Of). The mineral composition is simple, the most abundant minerals being iron (kamacite) (5.16–7.36 wt. % Ni) followed by taenite (16.73–33.93 wt. % Ni). Troilite nodules and daubréelite inclusions and thin veinlets are rare. The Widmanstätten pattern is uniform across the meteorite and plessite structure is developed locally. Analyses of cosmogenic radionuclides (14C and 26Al) indicate that the radius of the Smolenice meteorite could be 30±10 cm and its terrestrial age 11±2 kyr.

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斯洛伐克新Smolenice铁陨石的矿物学、地球化学和分类

在Smolenice附近的森林中发现了一块13.95公斤质量的轻度风化铁陨石（48°31.2’N，17°23.9’E；斯洛伐克Trnava县）。本体化学成分（以wt.%计）为：Fe 88.78，Ni 8.16，Co 0.38，P 0.05，S<0.006和（以μg/g计）：Ge<0.18，Ir 1.67，Ga 1.80，Cr 87.3，Cu 135.1，As 4.52，Mo 5.82，Sn 1.53，W 0.56，Re 0.18，Ru 3.56，Rh 0.90，Pd 4.12，Pt 5.35，Au 1.19，Zn<5，B<0.68，Pb<0.06。大块地球化学，特别是Ni、Ga、Ge和Ir的含量表明，该陨石是属于IVA族的八面体。钾铝矿片层的平均厚度为0.22mm，属于细八面体（of）。矿物成分简单，最丰富的矿物是铁（钾铝矿）（5.16–7.36 wt.%Ni），其次是铁铝矿（16.73–33.93 wt.%镍）。橄榄岩结核、涂抹岩包裹体和细细脉非常罕见。Widmanstätten图案在整个陨石上是均匀的，并且在局部发育了plessite结构。对宇宙成因放射性核素（14C和26Al）的分析表明，Smolenice陨石的半径可能为30±10厘米，其地球年龄为11±2 kyr。

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来源期刊

Geologica Carpathica 地学-地球科学综合

CiteScore

2.40

自引率

23.10%

发文量

审稿时长

>12 weeks

期刊介绍： GEOLOGICA CARPATHICA covers a wide spectrum of geological disciplines including geodynamics, tectonics and structural geology, volcanology, stratigraphy, geochronology and isotopic geology, karstology, geochemistry, mineralogy, petrology, lithology and sedimentology, paleogeography, paleoecology, paleobiology and paleontology, paleomagnetism, magnetostratigraphy and other branches of applied geophysics, economic and environmental geology, experimental and theoretical geoscientific studies. Geologica Carpathica , with its 60 year old tradition, presents high-quality research papers devoted to all aspects not only of the Alpine-Carpathian-Balkanian geoscience but also with adjacent regions originated from the Mediterranean Tethys and its continental foreland. Geologica Carpathica is an Official Journal of the Carpathian-Balkan Geological Association.