Chemical and genetic characterization of the ungrouped pallasite Lieksa

Chiappe, Emily M.; Ash, Richard D.; Luttinen, Arto; Lukkari, Sari; Kuva, Jukka; Hilton, Connor D.; Walker, Richard J.

doi:10.1111/maps.14095

Title: Chemical and genetic characterization of the ungrouped pallasite Lieksa

Journal Article · 02 November 2023 · Meteoritics and Planetary Science

DOI: https://doi.org/10.1111/maps.14095 · OSTI ID:2328594

^[1]; Ash, Richard D. ^[1]; Luttinen, Arto ^[2]; Lukkari, Sari ^[3];

^[3];

^[4];

^[1]

Univ. of Maryland, College Park, MD (United States)
Univ. of Helsinki (Finland). Finnish Museum of Natural History
Geological Survey of Finland, Espoo (Finland)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

The meteorite Lieksa was found in 2017 in Löpönvaara, Finland, and later donated to the Finnish Museum of Natural History. Here, we report siderophile element concentrations, genetic isotopic data, and a metal–silicate segregation age for the meteorite. The ~280 g Lieksa is ~80% metal and ~20% silicate and oxide inclusions by volume, with the inclusions consisting primarily of Fe-rich olivine. Due to Lieksa's silicate content, coupled with a texture characterized by metal enclosing the silicates, it has been classified as a pallasite. Lieksa's olivine and bulk chemical characteristics are distinct from those of the known pallasite and iron meteorite groups, consistent with its classification as ungrouped. The meteorite exhibits a flat, chondrite-normalized highly siderophile element pattern, consistent with an origin as an early crystallization product from a metallic melt with chondritic relative abundances. Molybdenum, Ru, and ¹⁸³W isotopic data indicate that Lieksa formed in the non-carbonaceous (NC) domain of the solar nebula. Radiogenic ¹⁸²W abundances for Lieksa yield a model metal–silicate segregation age of 1.5 ± 0.8 Myr after calcium-aluminum-rich inclusion formation, which is within the range established for other NC-type pallasite and iron meteorite parent bodies.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2328594

Report Number(s):: PNNL-SA--187059

Journal Information:: Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Journal Issue: 12 Vol. 58; ISSN 1086-9379

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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