Carbonates in Vigarano: Terrestrial, preterrestrial, or both?

Meteoritics & Planetary Science 40, Nr 4, 609–625 (2005) Abstract available online at http://meteoritics.org

Carbonates in Vigarano: Terrestrial, preterrestrial, or both? Neyda M. ABREU* and Adrian J. BREARLEY Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA *Corresponding author. E-mail: [email protected] (Received 16 July 2004; revision accepted 25 February 2005)

Abstract–Studies of two separate stones of the CV3 chondrite Vigarano have revealed the presence of previously unreported occurrences of calcite. In the first stone, calcite occurs as thin veins in a type B CAI. In contrast, observations of the second stone, which was recovered one month after its fall, show three calcite occurrences: networks of veins, vesicle fillings in the fusion crust, and pseudomorphic replacement of augite associated with a porphyritic olivine chondrule. The most common occurrence is as veins ranging in thickness from