Yaratkulovo – a new h-chondrite in the Urals: Mineralogical data
V.V. Sharygin, S.V. Kolisnichenko
The Yaratkulovo meteorite was found in 2016 in the Argayash district of the Chelyabinsk region. It is a «chondrite breccia», in which the light coarse-grained fragments (primary chondrite) occur in the dark fne-grained matrix (impact assemblages). Chondrules are very rare. By mineralogy and petrology, the Yaratkulovo meteorite belongs to H5 chondrite type, its impact degree is S5, and weathering degree is W3. The chondrite contains olivine (fo79.1fa20.4Tph0.5), orthopyroxene (En79.8fs19.0Wo1.2), Cr-bearing clinopyroxene (En46.8fs8.2Wo45.0), plagioclase (maskelenite) (Ab83.7An10.5Or5.8), chromite, chlorapatite, merrillite, troilite and fe-Ni metals (kamacite, taenite, tetrataenite), as well as micron-sized grains of the SiO2 polymorph and sarcopside-graftonite. Supergene minerals (goethite, «hydrogoethite», fe-hydrosulfde, and rare gypsum and fe-Ni-sulfate) form numerous veinlets in meteorite and pseudomorphs after troilite and metals.
Figures 10. Tables 4. References 21.
Key words: chondrite, impact melt, chondrules, chlorapatite, merrillite, goethite, Yaratkulovo, Urals.
МINERALOGY № 1 2017