globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116419
论文题名:
Two-stage formation of pallasites and the evolution of their parent bodies revealed by deformation experiments
作者: Walte N.P.; Solferino G.F.D.; Golabek G.J.; Silva Souza D.; Bouvier A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 546
语种: 英语
中文关键词: core-mantle differentiation ; deformation experiments ; early solar system ; microstructure ; pallasite ; texture
英文关键词: Aggregates ; Binary alloys ; Deformation ; Iodine compounds ; Iron compounds ; Metal melting ; Metals ; Nitrogen compounds ; Olivine ; Phosphorus compounds ; Silicates ; Solvents ; Strain rate ; Uranium compounds ; Core-mantle boundary ; Early solar systems ; High strain rate deformation ; Long-term retention ; Metal-silicate differentiation ; Percolation thresholds ; Stage formations ; Terrestrial planets ; Sulfur compounds ; core-mantle boundary ; deformation ; iron meteorite ; microstructure ; olivine ; pallasite ; parent body ; planetesimal ; silicate melt ; stony meteorite ; strain rate
英文摘要: Pallasites, stony-iron meteorites predominantly composed of olivine crystals and Fe-Ni metal, are samples of the interior of early solar system bodies and can thus provide valuable insights into the formation of terrestrial planets. However, pallasite origin is controversial, either sampling the core-mantle boundary or the shallower mantle of planetesimals that suffered an impact. We present high strain-rate deformation experiments with the model system olivine + FeS melt ± gold melt to investigate pallasite formation and the evolution of their parent bodies and compare the resulting microstructures to two samples of Seymchan pallasite. Our experiments reproduced the major textural features of pallasites including the different olivine shapes, olivine aggregates, and the distribution of the metal and sulfide phases. These results indicate that pallasites preserve evidence for a two-stage formation process including inefficient core-mantle differentiation and an impact causing disruption, metal melt injection, and fast cooling within months to years. Olivine aggregates, important constituents of angular pallasites, are reinterpreted as samples of a partially differentiated mantle containing primordial metallic melt not stemming from the impactor. The long-term retention of more than 10 vol% of metal melt in a silicate mantle sampled by olivine aggregates indicates high effective percolation thresholds and inefficient metal-silicate differentiation in planetesimals not experiencing a magma ocean stage. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165332
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作者单位: Heinz Meier-Leibnitz Centre for Neutron Science (MLZ), Technical University Munich, Garching, 85748, Germany; Department of Earth Sciences, Royal Holloway University of London, Egham, TW20 0EX, United Kingdom; Bayerisches Geoinstitut (BGI), University of Bayreuth, Bayreuth, 95447, Germany

Recommended Citation:
Walte N.P.,Solferino G.F.D.,Golabek G.J.,et al. Two-stage formation of pallasites and the evolution of their parent bodies revealed by deformation experiments[J]. Earth and Planetary Science Letters,2020-01-01,546
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