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Quaternary alkali basalts of the Azrou-Timahdite area contain a wide variety of ultramafic mantle xenoliths (e.g. lherzolites, wehrlites, pyroxenites and amphibolites). A comprehensive mineral chemistry studies using electron probe micro-analysis (EPMA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) allows us to propose a petrogenetic history of these ultramafic rocks...
Silicate glasses in peridotite xenoliths from Avacha volcano have high SiO 2 (up to 72 wt.%) and highly SiO 2 -oversaturated characteristics; normative quartz content is up to 50 wt.%. The glasses represent secondary melts solidified after interaction with mantle peridotite, i.e. crystallization of secondary orthopyroxene at the expense of olivine. We identified two kinds of silicate...
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