The vitric and pumiceous sand/sandstone and pumiceous gravel contain high concentrations of smectites, zeolites, and gypsum. Microscopic observations show that the volcanic glass and feldspars have been altered to smectites and zeolites. The authigenic mineral assemblages indicate that these minerals resulted from precipitation from circulating fluids, as well as from the alteration of glass and feldspar under temperature conditions that may have reached 200°-300°C. -from Authors
CITATION STYLE
Tazaki, K., & Fyfe, W. S. (1992). Diagenetic and hydrothermal mineral alteration observed in Izu-Bonin deep-sea sediments, Leg 126. Proc., Scientific Results, ODP, Leg 126, Bonin Arc/Trench System, 101–112. https://doi.org/10.2973/odp.proc.sr.126.121.1992
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