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 |
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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 |
Index ID | 70210121 |
Record Source | USGS Publications Warehouse |
USGS Organization | Geology, Minerals, Energy, and Geophysics Science Center; Pacific Coastal and Marine Science Center |