Inter Granular Basalt
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Transcript of Inter Granular Basalt
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Intergranular basalt
ophitik
subopitik
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pokilitik
FIG. 5. Microphotographs: a. Subophitic texture in the lowermost flow (AD96-30) of the Morro Negro basaltic sequence; notice that clinopyroxenes have a pinkish color, olivine microphenocryst are partly altered to brownish clay minerals, and Fe-Ti oxides are abundant; b. Glomeroporphyritic assemblage of plagioclase and olivine with iddingsite rim in the Morro Negro mesa basalt (AD96-27); c. Olivine phenocrysts altered to brown phyllosilicates and rimmed by orthopyroxene, in the prismatic dacitic lava flow (AD96-15); d. Typical assemblage of El Toro Formation dacite (AD96-15): sieve-textured plagioclases, clinopyroxene, and orthopyroxene (grey colored) rimmed by clinopyroxene (orange); phenocrysts are set in a glassy matrix.
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Intergranular texture in massive fine-grained basalt (cross-polarized light; field of view = 5.0 mm) (Sample 309-1256D-86R-3, 94–97 cm).
Gabro alkali
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Teprite
Fonolit nefelitownit
Ryodasit
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Ryolit
Syenit
Diorit
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Granit
Granodiorit
Monzonit
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Norit
Peridotit
Syenit
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troktolit