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Samples were collected from two carbonate chimneys on the summit of Conical Seamount, a serpentine diapir in the Mariana Forearc, by JAMSTEC's Shinkai 6500 submersible. The chimneys are composed of calcite, aragonite and an amorphous phase. The calcite and aragonite were precipitated under conditions of carbonate saturation, but the processes are complex in detail. Stained thin sections from samples...
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