Pampa del Infierno chondrite meteorite, Pampa del Infierno, Chaco, Argentina
Ref.: Boctor, N.Z., Bell, P.M., and Mao, H.K. (1982) Petrology and shock metamorphism of Pampa del Infierno chondrite. Geochimica et Cosmochimica Acta: 46: 1903-1911.
Rare chondrules and two types of dark-colored clasts occur in a light-colored matrix in the meteorite. Granular clasts display shock metamorphic features produced mainly by deformation, such as mosaicism, undulatory extinction, and fracturing. Partial melting in the granular clasts is manifested by the presence of selvages of mafic glass with troilite-iron eutectic intergrowths around remnants of low-Ca pyroxene and plagioclase glass with skeletal poikilitic inclusions of olivine. Clasts with spinifex texture are believed to have crystallized from a supercooled, impact-generated, ultramafic melt of the host chondrite or a chondritic source of similar composition. The shock-wave data suggest metamorphism by impact at a minimum peak pressure greater than 300 kbar (Boctor et al (1982)).
Mineral List
3 entries listed. 2 valid minerals.
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