FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2104955145> ?p ?o ?g. }

• W2104955145 endingPage "572" @default.
• W2104955145 startingPage "549" @default.
• W2104955145 abstract "Base metal massive sulfide deposits within felsic volcanic piles are typically zoned from a copper-rich base to a zinc [plus-minus sign] lead-rich top. In the Noranda and Matagami mining camps in the Archean Superior Province of eastern Canada chalcopyrite is concentrated with pyrrhotite-pyrite [plus-minus sign] magnetite in the base of the massive sulfide ore lenses or xvithin a stringer zone below the lenses. Passing stratigraphically upward the pyrite-pyrrhotite ratio generally increases, magnetite content decreases, and the tops of the orebodies are characterized by banded pyrite-sphalerite mineralization. The Cu-Zn-Pb-bearing massive sulfides in the kuroko district of Japan exhibit similar mineralogical zonation except for the general lack of magnetite and pyrrhotite and the abundance of sulfate gangue minerals.Massive pyritic ores within ophiolitic environments (the Cyprus type) are copper rich with nilnor zinc and negligible lead. They lack appreciable pyrrhotite and magnetite and are poorly zoned.All three ore types (Archean, kuroko, Cyprus) overlie pipes of hydrothermal alteration and are considered to have been deposited at or just below the sea-water-rock interface. They occur toward the center of the volcanic pile and are termed proximal ores. Banded sulfide ore lenses and metalliferous sediments that are not underlain by strong footwall alteration were probably deposited within restricted basins directly onto the sea floor from metal-bearing brines which have moved some distance from their fumarolic outlet. These ores are commonly Pb-Zn-rich types, well banded, occurring within a mixed volcanic-sedimentary environment, and are termed distal ores.Experimental data on the solubility of chalcopyrite, sphalerite, and galena indicate that there are two distinct environments in which Cu, Pb, and Zn may be transported to form massive sulfides: I. Reduced, high temperature (>275 degrees), acid to neutral pH environment. II. Oxidized, any temperature, any pH environment.Consideration of mineral-solution equilibria in the Fe-S-O system suggests that proximal Archean-type massive sulfides are deposited from high temperature, mildly acid, and reduced chloride-rich solutions (within environment I) which mix with sea water at the top of the volcanic pile. Mixing results in an increase in solution pH, fo2, and [Sigma]S accompanied by a drop in temperature and leads to the precipitation of chalcopyrite-pyrrhotite ([plus-minus sign] pyrite [plus-minus sign] magnetite) assemblages in the stringer and lower massive ore zones below the sea-water-rock interface, whereas pyrite-sphalerite [plus-minus sign] galena assemblages are deposited around the hydrothermal vent directly onto the sea floor. Solutions exhaled from the submarine vent move along the sea floor and deposit silica and pyrite to form the laminated cherty tuffs which are commonly associated with the ores. The presence of pyrite rather than hematite or magnetite in these sediment suggests that the exhaled solution probably contained an excess of reduced sulfur (Sr) over oxidized sulfur (So). This may have been a consequence of the reduced nature of the Archean ocean. Kuroko-type ores were probably deposited in a similar geological environment from solutions more rich in lead at a higher oxygen fugacity level.Whereas proximal massive sulfides develop under a trend of increasing So/Sr as the solution passes from environment I to II, distal ores on the other hand develop under a trend of decreasing So/Sr." @default.
• W2104955145 created "2016-06-24" @default.
• W2104955145 creator A5027642939 @default.
• W2104955145 date "1977-07-01" @default.
• W2104955145 modified "2023-10-09" @default.
• W2104955145 title "Chemical evolution and zonation of massive sulfide deposits in volcanic terrains" @default.
• W2104955145 doi "https://doi.org/10.2113/gsecongeo.72.4.549" @default.
• W2104955145 hasPublicationYear "1977" @default.
• W2104955145 type Work @default.
• W2104955145 sameAs 2104955145 @default.
• W2104955145 citedByCount "167" @default.
• W2104955145 countsByYear W21049551452012 @default.
• W2104955145 countsByYear W21049551452013 @default.
• W2104955145 countsByYear W21049551452014 @default.
• W2104955145 countsByYear W21049551452015 @default.
• W2104955145 countsByYear W21049551452016 @default.
• W2104955145 countsByYear W21049551452017 @default.
• W2104955145 countsByYear W21049551452018 @default.
• W2104955145 countsByYear W21049551452019 @default.
• W2104955145 countsByYear W21049551452020 @default.
• W2104955145 countsByYear W21049551452021 @default.
• W2104955145 countsByYear W21049551452022 @default.
• W2104955145 countsByYear W21049551452023 @default.
• W2104955145 crossrefType "journal-article" @default.
• W2104955145 hasAuthorship W2104955145A5027642939 @default.
• W2104955145 hasConcept C120806208 @default.
• W2104955145 hasConcept C127313418 @default.
• W2104955145 hasConcept C161840515 @default.
• W2104955145 hasConcept C17409809 @default.
• W2104955145 hasConcept C191897082 @default.
• W2104955145 hasConcept C192562407 @default.
• W2104955145 hasConcept C1965285 @default.
• W2104955145 hasConcept C205649164 @default.
• W2104955145 hasConcept C2780596425 @default.
• W2104955145 hasConcept C58640448 @default.
• W2104955145 hasConcept C86803240 @default.
• W2104955145 hasConcept C87355193 @default.
• W2104955145 hasConceptScore W2104955145C120806208 @default.
• W2104955145 hasConceptScore W2104955145C127313418 @default.
• W2104955145 hasConceptScore W2104955145C161840515 @default.
• W2104955145 hasConceptScore W2104955145C17409809 @default.
• W2104955145 hasConceptScore W2104955145C191897082 @default.
• W2104955145 hasConceptScore W2104955145C192562407 @default.
• W2104955145 hasConceptScore W2104955145C1965285 @default.
• W2104955145 hasConceptScore W2104955145C205649164 @default.
• W2104955145 hasConceptScore W2104955145C2780596425 @default.
• W2104955145 hasConceptScore W2104955145C58640448 @default.
• W2104955145 hasConceptScore W2104955145C86803240 @default.
• W2104955145 hasConceptScore W2104955145C87355193 @default.
• W2104955145 hasIssue "4" @default.
• W2104955145 hasLocation W21049551451 @default.
• W2104955145 hasOpenAccess W2104955145 @default.
• W2104955145 hasPrimaryLocation W21049551451 @default.
• W2104955145 hasRelatedWork W1758497512 @default.
• W2104955145 hasRelatedWork W1987691177 @default.
• W2104955145 hasRelatedWork W2036099453 @default.
• W2104955145 hasRelatedWork W2040829098 @default.
• W2104955145 hasRelatedWork W2070192581 @default.
• W2104955145 hasRelatedWork W2361911732 @default.
• W2104955145 hasRelatedWork W2380934447 @default.
• W2104955145 hasRelatedWork W2469646072 @default.
• W2104955145 hasRelatedWork W2538103680 @default.
• W2104955145 hasRelatedWork W3193970338 @default.
• W2104955145 hasVolume "72" @default.
• W2104955145 isParatext "false" @default.
• W2104955145 isRetracted "false" @default.
• W2104955145 magId "2104955145" @default.
• W2104955145 workType "article" @default.