Many specimens of the Toufassour mesosiderite meteorite found in Tata (Morocco) in 2003 contain large (up to 1.5 cm) single crystals of orthopyroxene, the abundance of which appears to be greater than that found in other mesosiderites. The aim of this work was to study the mineralogy and origin of these megacrysts. The results obtained have shown that, in contrast to orthopyroxene phenocrysts, the megacrysts feature a chemical imbalance with preexisting phenocrysts (Opx, Cpx and Ol), which suggests that pyroxene megacrystals are not crystallized in the same silicate bath.
Orthopyroxene Megacrysts in Toufassour Mesosiderite: Mineralogy and Origin
De Pascale O;Senesi GS
2019
Abstract
Many specimens of the Toufassour mesosiderite meteorite found in Tata (Morocco) in 2003 contain large (up to 1.5 cm) single crystals of orthopyroxene, the abundance of which appears to be greater than that found in other mesosiderites. The aim of this work was to study the mineralogy and origin of these megacrysts. The results obtained have shown that, in contrast to orthopyroxene phenocrysts, the megacrysts feature a chemical imbalance with preexisting phenocrysts (Opx, Cpx and Ol), which suggests that pyroxene megacrystals are not crystallized in the same silicate bath.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
