A complex magmatic plumbing system beneath the subvolcanic mafic sill intrusions, Gabal Qatrani, Faiyum Depression, NW Desert, Egypt: Evidence from mineral textures, zoning and chemistry

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This research aims to characterize the magmatic plumbing system beneath subvolcanic sills in Gabal Qatrani, through the analysis of mineral textures and chemistry.
Studied the petrography and geochemistry of tholeiitic basalt sills.
Analyzed mineral textures, zoning patterns, and chemical compositions of olivine, pyroxene, and plagioclase crystals.
Utilized thermobarometers to determine the pressure and temperature conditions of mineral formation.
Identified five populations of olivine and clinopyroxene, and four types of plagioclase with varying compositions.
Noted distinct variations in Mg-number and An content across mineral groups, indicating different magma origins.
Proposed a polybaric fractional crystallization model with three magma reservoirs at varying depths.

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Petrographic analysis reveals magma dynamics in subvolcanic sills, indicating complex processes of magma evolution.

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Khalaf et al. (2026) studied this question.

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