A Terrestrial Origin for Sulfate Veins in CI1 Chondrites

Mathematics – Logic

Scientific paper

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Scientific paper

White sulfate veins are a very well-known petrological feature of the chemically primitive CI1 carbonaceous chondrites. Sulfate veins were first described in the Orgueil meteorite in 1961, almost one century after its fall. However, we have observed such veins to form easily during typical sample storage. We suggest that all CI1 sulfate veins formed during the terrestrial residence of these heavily brecciated, porous stones. Reacting with atmospheric water, sulfates originally present in the meteorites dissolved and remobilized, and/or sulfides oxidised, filling the many open spaces offered to them by the very porous rock. Sulfate veins in CI1 chondrites can no longer be used as evidence of a late-stage oxidation event in the CI1 parent body, or of centimeter-scale fluid transport on the parent asteroid.

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