Other
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1007b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1007-1017
Other
1
Scientific paper
Petroleum-bearing fluid inclusions occur in sphalerite, calcite, dolomite, and barite at the Jumbo mine, a Mississippi Valley-type deposit in eastern Kansas. In addition to petroleum, Na-Ca-Mg-Fe chloride brines were present during deposition of calcite and sphalerite in which primary inclusions contain 23 equivalent wt.% NaCl. Dolomite- and barite-hosted inclusions are more dilute, possibly because of mixing between hydrothermal fluids and groundwater during mineralization. Primary oil inclusions in sphalerite have homogenization temperatures ( T h) between 85 and 95°C. Aqueous inclusions have T h values ranging from ~90 to 130°C for sphalerite to below ~50°C for barite. Primary brine inclusions in calcite at the Jumbo mine contain goethite, apparently as a daughter mineral (although it is possible that the goethite formed as a result of diffusion of H 2 from the inclusions like the hematite daughter described by and , 1968, from Bingham, Utah). Goethite has also been tentatively identified in inclusions from the Fletcher mine of Missouri. If goethite is a true daughter phase, it implies the presence of oxidized fluids during mineralization. This suggests that ore deposition resulted from interactions between hydrothermal fluids and dilute groundwater ( e.g. , by dilution or cooling of ore fluids, or oxidation of organometallic complexes that may have transported metal constituents).
Blasch Sheila R.
Coveney Raymond M. Jr.
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