A Microphotograph of a plagioclase crystal in the late Loma Morada intrusion. Growth zones with highly irregularly shaped melt inclusions, trapped concurrently with numerous solid phases suggest rapid growth, possibly through volatile loss. B Plagioclase inclusions in amphibole, each hosting silicate melt inclusions
In late intrusions, such melt inclusions can be very large, and many of them were trapped at the same time as numerous inclusions of biotite and magnetite occurring in the same growth zone (e.g., sample NB9–9, Fig. 4 A).
Inclusions in plagioclase, itself hosted by an amphibole have rarely been encountered but analyzed where possible (Fig. 4 B).
Other strong evidence for mixing are melt inclusions of 66 to 68 wt% SiO 2 in plagioclase phenocrysts, themselves trapped in amphibole hosting inclusions with 50 wt% SiO 2 (Fig. 4 B), and by the bimodal distribution of melt inclusion chemistries (Fig. 8 )..
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