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Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise

May 14, 1981

Core recovered from Hess Rise contains concentrations of pyrite, marcasite, and barite in the lowermost meter of limestone (Unit II) and in the brecciated upper part of the underlying volcanic basement (Unit HI). Petrographic and chemical data indicate that the sulfide-barite assemblage in the limestone is mainly a product of low-temperature diagenetic processes. The iron-sulfide phases are biogenic and their concentrations mark the diffusion of sea water sulfate through sedimentary horizons containing abundant organic matter and mafic, glassy volcanogenic detritus. There is some evidence, however, that elevated temperatures augmented or intensified the synsedimentary diagenetic process.

Citation Information

Publication Year 1981
Title Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise
DOI 10.2973/dsdp.proc.62.141.1981
Authors Randolph A. Koski, James R. Hein
Publication Type Article
Publication Subtype Journal Article
Series Title Initial reports of the Deep Sea Drilling Project
Series Number
Index ID 70210121
Record Source USGS Publications Warehouse
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center