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Journal Articles Microscopy and Microanalysis Year : 2018

Origins of Secondary Minerals in Micrometeorites

E. Dobrica
  • Function : Author
R. Ogliore
  • Function : Author
K. Nagashima
  • Function : Author
A. Brearley
  • Function : Author


This study aims to understand the formation of hydrated micrometeorites through detailed descriptions of their mineralogy and measurements of their isotopic compositions. The secondary mineralogy of hydrated cometary micrometeorites may differ from hydrated asteroidal particles because the conditions of cometary alteration were likely different from asteroidal aqueous alteration. In addition, the O isotopic composition of secondary minerals in cometary particles may also be distinct and reflect the presence of spatially distinct water reservoirs in the solar nebula [1-4]. Here we present the mineralogy and oxygen isotope compositions of magnetite grains and a magnetite- dolomite assemblage that were identified in five hydrated AMMs. The purpose of these measurements is to investigate the diversity of the water reservoir from which hydrated AMMs formed and the temperature at which these minerals co-precipitated.
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Dates and versions

hal-02360870 , version 1 (15-11-2022)



E. Dobrica, R. Ogliore, Cecile Engrand, K. Nagashima, A. Brearley. Origins of Secondary Minerals in Micrometeorites. Microscopy and Microanalysis, 2018, 24 (S1), pp.2096-2097. ⟨10.1017/S1431927618010966⟩. ⟨hal-02360870⟩
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