File:Basalt 36mw1041.jpg
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Summary
Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. An olivine-plagioclase phyric basalt, sample 36MW1041 contains plagioclase (60%), clinopyroxene (25%), chlorite (8%), and oxides (7%). Tabular plagioclase phenocrysts reach 2.5 mm. All olivine has been replaced by chlorite. The matrix, composed of plagioclase, clinopyroxene, chloritized olivine, and oxides exhibits a felty texture. Olivine also occurred as phenocrysts up to 0.6 mm long. Oxides show anhedral growth rims, suggesting a second growth episode, possibly during alteration of other minerals.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:26, 15 January 2017 | | 2,232 × 1,886 (653 KB) | 127.0.0.1 (talk) | Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. An olivine-plagioclase phyric basalt, sample 36MW1041 contains plagioclase (60%), clinopyroxene (25%), chlorite (8%), and oxides (7%). Tabular plagioclase phenocrysts reach 2.5 mm. All olivine has been replaced by chlorite. The matrix, composed of plagioclase, clinopyroxene, chloritized olivine, and oxides exhibits a felty texture. Olivine also occurred as phenocrysts up to 0.6 mm long. Oxides show anhedral growth rims, suggesting a second growth episode, possibly during alteration of other minerals. |
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