Sierra Gorda 013: Unusual CBa?like chondrite

The new metal-enriched anomalous chondrite Sierra Gorda 013 (SG 013) contains two different lithologies. Lithology 1 (L1) is represented by CBa-like material containing ~80 vol% of Fe,Ni-metal particles and globules up to 6 mm in size; chondrules clasts types POP, BO, SO (up 5 diameter); rare sulfides; shock melted silicate–metal areas. It does not contain any fine-grained matrix. Several chromite–pyroxene symplectites. 2 (L2) has a recrystallized texture with evenly distributed olivine, pyroxene plagioclase. L2 have or sulfides, less Fe,Ni- metal (~25 vol%) than L1. Both lithologies reduced olivine (Fa2–4) (Fs3.5), similar CBa chondrites. Similar CBa, there no Ni-Co correlation the SG metal. Rare sulfides L1 are enriched V. Chromite was observed both Oxygen isotope compositions but range Bulk major trace element geochemistry nonporphyritic bulk siderophile indicate elemental fractionation during formation metallic silicate objects records evaporation process: depletion moderate volatile elements exception Cr. porphyritic portion also indicates processes. Earth (REE) distribution very fractionated signature corresponding possible differentiated precursor material, while REE pattern primitive chondritic. could be explained collisions planetesimals producing an impact plume, which chondritic possibly differentiated. were affected secondary processes: preserved traces events partial melting resulting symplectites chondrules, melt pockets, metal–silicate between globules; thermal metamorphism 900 °C) recrystallization.