Evidence of co-temporality between olivine and metal in Tucson

IF 1.7 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Planetary and Space Science Pub Date : 2026-02-01 Epub Date: 2026-01-28 DOI:10.1016/j.pss.2026.106241

Laura Noel García , Juan Agustin Macchi , Pouyan Shen , Ludovic Ferrière , Maria Eugenia Varela

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Abstract

Classical studies have noted the striking interfaces between olivine grains and metal in the Tucson meteorite, often exhibiting well-defined crystal facets. This feature is rare in iron meteorites, particularly for grains smaller than ∼100 μm. Traditionally, these interfaces have been interpreted as a result of recrystallization in the taenite (fcc) stability field, with olivine surfaces reflecting the cubic symmetry of taenite. However, our results suggest that these interfaces are better explained by the idiomorphic growth of olivine, presumably co-crystallizing with metal in a non-epitaxial manner. High-resolution TKD and TEM analyses reveal clean, non-epitaxial olivine/fcc metal interfaces, kamacite (bcc) subgrains, and solute-partitioned epitaxial fcc/bcc interfaces, indicative of solid-state diffusional processes for phase transformation and polygonization following annealing. These findings provide strong evidence that the Tucson meteorite may share a genetic relationship with chondrites, supporting a high-temperature formation scenario where olivine and metal co-condensed from a nebular environment.

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图森的橄榄石和金属同时存在的证据

经典研究已经注意到图森陨石中橄榄石颗粒和金属之间的惊人界面，通常显示出明确的晶体切面。这种特征在铁陨石中是罕见的，特别是对于小于~ 100 μm的颗粒。传统上，这些界面被解释为带长石（fcc）稳定性场中再结晶的结果，橄榄石表面反映了带长石的立方对称性。然而，我们的研究结果表明，这些界面可以更好地解释为橄榄石的自晶生长，可能是与金属以非外延的方式共晶。高分辨率TKD和TEM分析揭示了干净的非外延橄榄石/fcc金属界面，卡玛石（bcc）亚晶粒，以及溶质分块的外延fcc/bcc界面，表明退火后的相变和多角化的固态扩散过程。这些发现提供了强有力的证据，表明图森陨石可能与球粒陨石有共同的遗传关系，支持了一种高温形成情景，即橄榄石和金属在星云环境中共同凝聚。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Planetary and Space Science 地学天文-天文与天体物理

CiteScore

5.40

自引率

4.20%

发文量

126

审稿时长

15 weeks

期刊介绍： Planetary and Space Science publishes original articles as well as short communications (letters). Ground-based and space-borne instrumentation and laboratory simulation of solar system processes are included. The following fields of planetary and solar system research are covered: • Celestial mechanics, including dynamical evolution of the solar system, gravitational captures and resonances, relativistic effects, tracking and dynamics • Cosmochemistry and origin, including all aspects of the formation and initial physical and chemical evolution of the solar system • Terrestrial planets and satellites, including the physics of the interiors, geology and morphology of the surfaces, tectonics, mineralogy and dating • Outer planets and satellites, including formation and evolution, remote sensing at all wavelengths and in situ measurements • Planetary atmospheres, including formation and evolution, circulation and meteorology, boundary layers, remote sensing and laboratory simulation • Planetary magnetospheres and ionospheres, including origin of magnetic fields, magnetospheric plasma and radiation belts, and their interaction with the sun, the solar wind and satellites • Small bodies, dust and rings, including asteroids, comets and zodiacal light and their interaction with the solar radiation and the solar wind • Exobiology, including origin of life, detection of planetary ecosystems and pre-biological phenomena in the solar system and laboratory simulations • Extrasolar systems, including the detection and/or the detectability of exoplanets and planetary systems, their formation and evolution, the physical and chemical properties of the exoplanets • History of planetary and space research