Origin of clouded red feldspars; petrologic contrasts in a granitic porphyry intrusion

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ID: 295968
1969
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Abstract
A granitic porphyry emplaced at a high crustal level in the Gaspe Peninsula exposes broad areas of altered porphyry containing the sub-assemblage red albite + chloritized biotite grading into restricted areas of gray porphyry with the critical subassemblage clear oligoclase-andesine + less altered biotite. These are end membersof a gradational change. Hematiferous albites are relict phenocrysts of plagioclase initially more calcic and potassic. They are related to potassic oligoclases and andesines in less altered porphyries by a paragenetic model involving reaction between ternary feldspar, a vapor phase, and Fe + or - Mg released during decomposition and oxidation of the primary mafic phase, on a fixed K-Al basis. Formation of low-Al chlorite as a minor additional inclusion phase may involve loss of Al (super 3+) from the site of the host feldspar. Contrasts in feldspar zoning further illustrate the sequence.
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Authors Gary M. Boone
Journal american journal of science
Year 1969
DOI
10.2475/ajs.267.6.633
URL
https://ajs.scholasticahq.com/article/59335.pdf
Keywords Keywords not found

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