• 文献标题:   Evidence for protosolar graphene in Allende and QUE 94366 CV3 meteorites
  • 文献类型:   Article
  • 作  者:   GIRI C, STEELE A, FRIES M
  • 作者关键词:   graphene, protosolar nebula, calciumaluminumrich inclusion, carbon allotrope, raman, presolar refractory mineral
  • 出版物名称:   PLANETARY SPACE SCIENCE
  • ISSN:   0032-0633 EI 1873-5088
  • 通讯作者地址:  
  • 被引频次:   1
  • DOI:   10.1016/j.pss.2021.105267 EA JUN 2021
  • 出版年:   2021

▎ 摘  要

Nanoscale graphene morphologies are reported in the Allende and QUE 94366 CV3-type carbonaceous chondrites via Confocal Raman Imaging Spectroscopy. These morphologies are found embedded in the refractory calcium-aluminum-rich inclusion (CAI) rims in Allende and within a chondrule inclusion in QUE 94366. Earlier investigation already revealed graphite whiskers (GWs) presence in both these meteorites. Further inspection of the meteoritic sections, coupled with advancements in the knowledge of carbon materials, reveal a re-interpretation of Raman features of a subset of the reported GWs and newer analyzed features as graphene. This meteoritic graphene perhaps originated from the same protosolar carbon reservoir that synthesized the GWs. The graphene was most likely synthesized concurrent to the inclusions and CAIs, in a high-temperature zone near the proto-Sun and during the solar system's earliest eon. However, in the case of Allende we cannot totally rule out synthesis during later aqueous alteration of the original mineral CAI assemblage.