* Astronomy

Title: 244PU Fission xe in the Chervony Kut and Vetluga Achondrites
Authors: Shukolyukov, Y. A., Minh, D. V., & Scripnik, A. Y.

In this work we will present our first data on Xe isotopic composition of bulk rock samples feldspar Chervony Kut and Vet1uga achondrites-eucrites and compare them with those of the earlier studied gas-rich Pesyanoe achondrite-aubrite (Table 1). The basaltic Chervony Kut and Vetluga achondrites are normal eucrites and have the mineral composition and structure like that of the Juvinas meteorite. The Chervony Kut achondrite is non-breccia eucrite with homogenously distributed pyroxene and plagioclase crystals. The average crystal size is of about 1 mm. The structure of the meteorite is gabbroic and subophitic but more coarse-grained in comparison with that of the Stannern and Juvinas meteorites. The empty spaces between great crystals of basic rock were filled up by fine grain aggregation of pyroxene, plagioclase and troilite relating to the later stage of crystallisation. Ilmenite is an accessory mineral. Plagioclase and pyroxene show impact features. The brecciated Vetluga meteorite is composed of white eucrite fragments cemented by fine-grained material, probably, of same composition. The structure of eucrite rock is ophitic, rarely gabbroic, inhomogenously grained. The average crystal size in fragment is of about 0.3mm. Accessory minerals, such as troilite, chromite, ilmenite, kamasite, quartz, tridymite were found. The Vetluga meteorite is very like the Stannern achondrite but its grain size is smaller than that of the Stannern achondrite. The Pesyanoe achondrite is a breccia of enstatite crystals and their fragments placed in matrix of fine-grained material. It is close to the Norton County meteorite with respect to the mineral composition. The impact features are observed in the Pesyanoe achondrite.

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