Clinopyroxenes in Mesozoic pillow lavas from the French Alps: influence of cooling rate on compositional trends

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Scientific paper

The clinopyroxene compositions determined in four spilite samples from the French Alps show trends with high Al and Ti contents. Two samples from the center and outer zones of a single pillow have different Al/Ti ratios as well as different evolution trends in the Ca-Fe-Mg system. Two samples collected from two different pillows in another outcrop also show different Al and Ti contents. These variations can be correlated with texture and grain size of the rocks and can be seen to follow trends predicted from recent cooling rate experiments. Analyses of relict clinopyroxenes from a glaucophane-lawsonite-bearing pillow show that these metastable clinopyroxenes can survive an episode of low-temperature, high-pressure metamorphism.

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