DOI: 10.1016/j.epsl.2018.09.027
Scopus记录号: 2-s2.0-85054574554
论文题名: Olivine grain growth in partially molten Fe–Ni–S: A proxy for the genesis of pallasite meteorites
作者: Solferino G.F.D. ; Golabek G.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 504 起始页码: 38
结束页码: 52
语种: 英语
英文关键词: 2D numerical model
; grain growth
; olivine
; pallasite
; partially molten Fe–Ni–S
; silicate-metal texture
Scopus关键词: Mixing
; Numerical models
; Olivine
; Silicate minerals
; 2D numerical models
; Competing growth
; Experimental series
; Formation constraints
; Formation process
; Grain size
; Non destructive
; pallasite
; Grain growth
英文摘要: The origin of pallasites has been the focus of a number of recent studies. Yet, their formation process remains elusive, while the mechanism leading to the genesis of the sub-group termed ‘mixed type’ pallasites (containing polygonal, rounded, and fragmental olivines simultaneously) is unclear. Here we test the hypothesis of mixing of olivine fragments with Fe–Ni–S after a non-destructive impact followed by annealing employing both experimental analogues and numerical models. The experimental series evidenced that the addition of sulfur to olivine + Fe–Ni accelerates olivine grain growth, though the growth rate is reduced when Fe–Ni–S is not fully molten. This is shown to be the consequence of competing growth of olivine and Fe–Ni grains. Numerical models satisfying available formation constraints from natural samples indicate that planetesimals with radii ≥200 km are favorable for the genesis of rounded olivine-bearing pallasites by annealing of fragments in partially molten Fe–Ni–S. Moreover, early mixing in the planetesimal can form regions containing olivine grains with different grain sizes that could explain the formation of mixed-type pallasites. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109606
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth Sciences, Royal Holloway University of London, Egham, TW20 0EX, United Kingdom; Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany
Recommended Citation:
Solferino G.F.D.,Golabek G.J.. Olivine grain growth in partially molten Fe–Ni–S: A proxy for the genesis of pallasite meteorites[J]. Earth and Planetary Science Letters,2018-01-01,504