The mineralogy of the Yaringie Hill meteorite-A new H5 chondrite from South Australia

摘要

The Yaringie Hill meteorite is a new H5 ordinary chondrite found in the Gawler Ranges, South Australia. The meteorite, which shows only minor signs of terrestrial weathering, is predominantly composed of olivine (Fa(17.2)), orthopyroxene (Fs(15.1)Wo(1.1)), and three distinct phases of nickeliferous iron metal (kamacite, taenite, tetrataenite). Other minerals include troilite, plagioclase (Ab(81)An(16)Or(3)), clinopyroxene (En(52)Wo(42)Fs(6)), chlorapatite, merrillite, ilmenite, and native copper. Three types of spinel with distinctive textures (coarse, skeletal aggregates, rounded aggregates) and with compositions close to the join MgAl2O4-FeCr2O4 are also present. Chondrules within the Yaringie Hill meteorite, which often have poorly defined boundaries, are placed in a recrystallized matrix. Shock indicators Suggest that the meteorite experienced only weak shock metamorphism (S3).