Formation of FeNi metal nodules in the Jilin H5 chondrite, the largest stone meteorite in the world

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2023-07-05 DOI:10.1007/s11631-023-00627-5

Xiande Xie

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Abstract

The Jilin H5 chondrite, the largest known stony meteorite in the world, with its No.1 fragment weighing 1770 kg. It contains submillimeter- to centimeter-sized FeNi metal particles/nodules. Our optical microscopic and electron microprobe analyses revealed that the formation of metal nodules in this meteorite is a complex and long-term process, The early stage is the thermal diffusion-caused migration and concentration of dispersed metallic material along fractures to form root-hair shaped metal grains during thermal metamorphism of this meteorite. The later two collision events experienced by this meteorite led to the further migration and aggregation of metallic material into the shock-produced cracks and openings to form larger-sized metal grains. The shock-produced shear movement and frictional heating occurred in this meteorite greatly enhanced the migration and aggregation of metallic material to form the large-sized nodules. It was revealed that the metal nodule formation process in the Jilin H5 chondrite might perform in the solid or subsolidus state, and neither melting of chondritic metal grains nor shock-induced vaporization of bulk chondrite material are related with this process.

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世界上最大的石质陨石——吉林H5球粒陨石中FeNi金属结核的形成

吉林H5球粒陨石是世界上已知最大的石质陨石，其第一号碎片重达1770公斤。它含有亚毫米到厘米大小的镍金属颗粒/结核。光学显微镜和电子探针分析表明，该陨石中金属结核的形成是一个复杂而长期的过程，在热变质作用过程中，早期是由热扩散引起的分散金属物质沿裂隙迁移和富集形成根毛状金属晶粒。该陨石经历的后两次碰撞事件导致金属材料进一步迁移和聚集到冲击产生的裂缝和开口中，形成更大尺寸的金属颗粒。该陨石中发生的冲击剪切运动和摩擦加热极大地促进了金属物质的迁移和聚集，形成了大尺寸的结核。结果表明，吉林H5球粒陨石中金属结核的形成过程可能以固态或亚固态状态进行，球粒金属晶粒的熔化和块状球粒陨石材料的冲击汽化均与此过程无关。

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来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.