Mineralogy and defect microstructure of an olivine-dominated Itokawa dust particle: evidence for shock metamorphism, collisional fragmentation, and LL chondrite origin

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• 作者：Falko Langenhorst ; Dennis Harries ; Kilian Pollok…
• 关键词：Hayabusa ; Itokawa ; Shock metamorphism ; Collisional fragmentation ; Ordinary chondrite ; Olivine ; Tetrataenite ; Troilite ; Diopside
• 刊名：Earth, Planets and Space
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：66
• 期：1
• 全文大小：1761KB
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• 作者单位：Falko Langenhorst (21)
  Dennis Harries (21)
  Kilian Pollok (21)
  Peter A van Aken (22)
  
  21. Analytical Mineralogy of Micro- and Nanostructures, Institute of Geoscience, Friedrich Schiller University Jena, Carl-Zeiss-Promenade 10, D-07745, Jena, Germany
  22. Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569, Stuttgart, Germany
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

We report here detailed analytical scanning and transmission electron microscopic investigations on an olivine-dominated dust particle (RB-QD04-0042) from the surface of asteroid 25143 Itokawa. The dust particle was returned to Earth by the Hayabusa spacecraft and was made available in the context of the first announcement of opportunity for Hayabusa sample investigation. Multiple thin slices were prepared from the precious particle by means of focused ion beam thinning, providing a unique three-dimensional access to its interior. The 40?×-0 μm sized olivine particle contains a spherical diopside inclusion and an intimate intergrowth of troilite and tetrataenite. The compositions of olivine (Fo₆₉Fa₃₁) and diopside (En₄₈Wo₄₂Fs₁₀), as well as the high Ni content of the sulfide-metal alloy, indicate a LL ordinary chondrite origin in accord with previous classifications. Although no impact crater exists at the surface of RB-QD04-0042, transmission electron microscopy revealed the presence of various shock defects in constituent minerals. These defects are planar fractures and [001] screw dislocations in olivine, multiple {101} deformation twins in tetrataenite and basal (0001) stacking faults in troilite. These diagnostic shock indicators occur only in a small zone on one concave side of the dust particle characterized by a high fracture density. These observations can be explained by a collisional event that spalled off material from the particle's surface. Alternatively, the dust particle itself could be a spallation fragment of an impact into a larger regolith target. This suggests that Itokawa dust particles lacking visible microcraters on their surfaces might have still experienced shock metamorphism and were involved in collisional fragmentation that resulted in the formation of regolith. Keywords Hayabusa Itokawa Shock metamorphism Collisional fragmentation Ordinary chondrite Olivine Tetrataenite Troilite Diopside