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SummaryNaFe augitic green-core pyroxenes (hereafter called GCPX) are common in the silica-undersaturated basaltic rocks of many magmatic alkaline provinces. In the Cantal massif, green-core pyroxenes occur in nearly all the Supracantalian basalts (9.5 to 2Ma), in contrast to the Infracantalian basalts (13 to 9.5Ma) where they are rarely observed. An electron microprobe study demonstrates that the...
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