CV and CM chondrite impact melts

Clast-rich H-chondrite Impact Melts

Introduction: The H-chondrite parent asteroid provides the second-most abundant type of meteorites that currently reach Earth's surface [1]. These rocks recorded their parent asteroid's collisional history and melted H-chondrites chronicle the most severe cratering events. Samples and Methods: Seven samples of clast-rich impact melt rocks from the La Paz Icefield, Antarctica were analyzed in Pl...

CHONDRITE MELTING EXPERIMENTS: CAN ANGRITE LEW87051 BE PRODUCED BY PARTIAL MELTING OF A CV OR CM CHONDRITE? A.J.G Jurewicz

Introduction: LEW2 consists of abundant, coarse subhedral to euhedral olivine crystals (-FOG()90, typical grainsize -0.5mm) set in a fine-grained intergranular groundmass composed primarily of plagioclase, olivine, and Ca-A1 pyroxene [eg. 1,2]. The groundmass clearly represents a crystallized melt [3,4]. McKay et al. [6] proposed that this interstitial groundmass melt was produced by fractional...

What does the CM chondrite Mineralogic Alteration Index really mean?

Introduction: CM chondrites contain minerals that formed by interaction between liquid water and anhydrous minerals [1]. How this process progressed on the parent body is important for understanding how to unravel the effects of aqueous alteration in these meteorites. Studies undertaken to qualify [1] and quantify [2] the extent of alteration found in the CMs resulted in a mineralogic alteratio...

Exploring thermal signatures in the experimentally heated CM carbonaceous chondrite

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Mineralogy and Petrography of Mil 090001, a Highly Altered Cv Chondrite from the Reduced Sub-group