Bibliographic Citation
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Title | Geochemical processes of formations of red-bed associated Cu-Co deposit at Kamoto, Zaire |
Creator/Author | Hoy, L.D. ; Ohmoto, H. ; Rose, A.W. |
Publication Date | 1985 Jan 01 |
OSTI Identifier | OSTI ID: 6196953 |
Report Number(s) | CONF-8510489- |
Other Number(s) | CODEN: GAAPB |
Resource Type | Conference |
Specific Type | Journal Article |
Resource Relation | Geol. Soc. Am., Abstr. Programs ; Vol/Issue: 17; 98. annual meeting of the Geological Society of America; 28 Oct 1985; Orlando, FL, USA |
Research Org | Pennsylvania State Univ., University Park (USA) |
Subject | 580300 -- Mineralogy, Petrology, & Rock Mechanics-- (-1989) ;580400 -- Geochemistry-- (-1989); CARBONATE ROCKS-- DIAGENESIS;CARBONATE ROCKS-- HYDROTHERMAL ALTERATION;COBALT ORES-- CHEMICAL COMPOSITION;COBALT ORES-- MINERALIZATION;COBALT ORES-- PETROGENESIS;COPPER ORES-- CHEMICAL COMPOSITION;COPPER ORES-- MINERALIZATION;COPPER ORES-- PETROGENESIS;ZAIRE REPUBLIC-- CARBONATE ROCKS;ZAIRE REPUBLIC-- COBALT ORES;ZAIRE REPUBLIC-- COPPER ORES; CARBON 13;GEOCHEMISTRY;HYDROTHERMAL SYNTHESIS;ISOTOPE RATIO;MINERALOGY;OXYGEN 18;PETROLOGY;PYRITE;QUANTITATIVE CHEMICAL ANALYSIS;SULFUR CONTENT |
Related Subject | AFRICA;CARBON ISOTOPES;CHALCOGENIDES;CHEMICAL ANALYSIS;CHEMISTRY;DEVELOPING COUNTRIES;EVEN-EVEN NUCLEI;EVEN-ODD NUCLEI;GEOLOGY;IRON COMPOUNDS;IRON SULFIDES;ISOTOPES;LIGHT NUCLEI;MINERALS;NUCLEI;ORES;OXYGEN ISOTOPES;ROCKS;SEDIMENTARY ROCKS;STABLE ISOTOPES;SULFIDE MINERALS;SULFIDES;SULFUR COMPOUNDS;SYNTHESIS;TRANSITION ELEMENT COMPOUNDS |
Description/Abstract | In the stratiform Cu-Co deposit at Kamoto, ore minerals occur in layers conformable to bedding, or as replacement of nodular and/or bedded dolomite within marine to littoral sediments overlying a thick continental red-bed sequence. delta/sup 13/C and delta/sup 13/O values of more than 70 dolomite samples from the red-bed, ore zone and unmineralized hangingwall sediments were determined to be -9 to +3 per thousand (PDB) and + 7 to +24 per thousand(SMOW), respectively.^The delta/sup 13/C values correlate negatively with the amount of relict organic matter in the samples.^Poor correlation between delta/sup 13/C and delta/sup 18/O indicates that dolomitization incorporating oxidized organic carbon occurred through a large temperature range. delta/sup 34/S values of about 70 ore sulfide samples range from -15 to +17 per thousand (CDT), correlating positively with both total S content of the samples and the delta/sup 13/C of associated dolomite.^The isotopic data, the overgrowth and replacement textures observed among ore and gangue minerals, and the results of thermochemical calculations on the solubility and stability of the sulfides suggest that: (1) less than 30% of the sulfide sulfur in the deposit was fixed as bacteriogenic pyrite during early diagenesis; and (2) the Cu and Co sulfides were formed by later reaction between Cu-, Co- and SO/sub 4/-bearing hot (50-200/sup 0/C.) brines and the diagenetic pyrite, augmented by additional sulfate reduction through organic matter oxidation. |
Country of Publication | United States |
Language | English |
Format | Pages: 614 |
System Entry Date | 2001 May 13 |
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