Microchemical and structural evidence for space weathering in soils from asteroid Itokawa

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• 作者：Michelle S Thompson ; Roy Christoffersen ; Thomas J Zega&#8230
• 关键词：Hayabusa ; Itokawa ; Space weathering ; Irradiation ; Micrometeorite impact ; Airless body ; Transmission electron microscopy ; Sample return analysis
• 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：2496KB
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• 作者单位：Michelle S Thompson (1)
  Roy Christoffersen (2)
  Thomas J Zega (1)
  Lindsay P Keller (3)
  
  1. Lunar and Planetary Laboratory, University of Arizona, 1629 E University Blvd, Tucson, AZ, 85721, USA
  2. Jacobs, NASA Johnson Space Center, Mail Code KR, Houston, TX, 77058, USA
  3. NASA JSC Mail Code KR, Houston, TX, 77058, USA
  
• 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

Here we report microchemical and microstructural features indicative of space weathering in a particle returned from the surface of asteroid Itokawa by the Hayabusa mission. Space weathering features include partially and completely amorphous rims, chemically and structurally heterogeneous multilayer rims, amorphous surface islands, vesiculated rim textures, and nanophase iron particles. Solar-wind irradiation is likely responsible for the amorphization as well as the associated vesiculation of grain rims. The multilayer rims contain a nanocrystalline outer layer that is underlain by an amorphous inner layer, and both have compositions that are distinct from the underlying, crystalline orthopyroxene grain. The multilayer rim features could be derived from either radiation-induced sputter deposition or vapor deposition from micrometeorite impact events. The amorphous islands on grain surfaces have a distinctive morphology and composition suggesting that they represent surface deposits of melt derived from micrometeorite impact events. These observations indicate that both irradiation damage and micrometeorite impacts play a role in surface modification and space weathering on asteroid Itokawa. Keywords Hayabusa Itokawa Space weathering Irradiation Micrometeorite impact Airless body Transmission electron microscopy Sample return analysis