Abstract
Hyaloclastites are particularly suitable material for palagonitization. This process of alteration leads to the formation in broadly equal proportions of authigenic minerals and palagonite. When the palagonitization process reachs the stage where voids between fragments, and vesicles within fragments are completely filled with authigenic minerals so as to make the rock more or less impermeable to water, the rate of the palagonitization process is thought to slow down considerably. Depending upon the original texture and porosity of the hyaloclastite, sideromelane may or may not remain at this stage. This may explain why sideromelane, which otherwise would have been completely palagonitized, can be found in relatively old hyaloclastites. Further, study of palagonitization taking place around glassy vesicle walls strongly suggests that the process is post-cruptional, being initiated at the time the glass encounters an equeous environment, and proceeds at low temperatures.
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Furnes, H. Volume relations between palagonite and authigenic minerals in hyaloclastites, and its bearing on the rate of palagonitization. Bull Volcanol 38, 173–186 (1974). https://doi.org/10.1007/BF02597809
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DOI: https://doi.org/10.1007/BF02597809