Magma mixing and mingling textures in granitoids: examples from the Galway Granite, Connemara, Ireland |
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Authors: | S Baxter M Feely |
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Institution: | (1) Department of Geology, National University of Ireland, Galway, Ireland, IE |
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Abstract: | Summary ?Many granitoid intrusions display textural evidence for the interaction of mafic and silicic magmas during their genesis.
The ∼ 400 Ma Galway Granite exhibits excellent evidence for magma mixing and mingling both at outcrop/map scale (magma mingling
and mixing zones), and at thin-section/crystal scale (mixing textures). These textures – quartz ocelli, rapakivi feldspars,
acicular and mixed apatite morphologies, inclusion zones in feldspars, anorthite ‘spikes’ in plagioclase, sphene ocelli, K-feldspar
megacrysts in mafic microgranular enclaves (MME), and mafic clots – constitute a textural assemblage whose origin can be explained
in terms of magma mixing and mingling models. Furthermore, textures from this assemblage have been recorded throughout the
Galway batholith indicating that magma mingling and mixing played a key role during its evolution.
Received November 18, 2000; revised version accepted November 6, 2001 |
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