Question

Consider bowen's reaction series. which mineral would you expect to see as a phenocryst in a porphyritic basalt?

Answer 1

We will get Plagioclase as phenocryst in a porphyritic basalt using Bowmen's reaction series.

Porphyritic basalt is mafic  i.e. it has low silica content  and have higher melting point than felsic which have higher silica content . Porphyritic basalt's mineral composition is Calcium Plagioclase . Phenocryst is large crystal , early forming igneous rock.

Thus , on cooling plagioclase will be seen as phenocryst which is clear from Bowmen's reaction series because it is present on right side of series at higher temperature range in continuous branch in mafic region.

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