Detrital feldspar species in sandstones are diagnostic of their igneous/metamorphic source rock: different feldspar types crystallize in characteristic parent rock types.
Orthoclase is most commonly sourced from granites and pegmatites (I-B). Ca-rich plagioclase (e.g., labradorite/bytownite) is typical of basaltic (mafic) source rocks (II-D). Sanidine, a high-temperature...
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