Model for the origin of the lead ores of southeastern Missouri

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6643614

Crocetti, C A; Holland, H D

The isotopic composition of lead in galenas from the entire Southeast Missouri lead district lies along mixing lines between less radiogenic and more radiogenic end members. The less radiogenic (normal) component in most of the galena leads has a composition that is similar to that of lead in basinal brines. All of the radiogenic and members have compositions which are consistent with the extraction of radiogenic lead from the Precambrian basement of the central USA. The authors propose that the observed mixing lines for all except perhaps the cubic galenas from the Viburnum Trend reflect either the mixing of basinal brines with fluids which have extracted radiogenic lead from the basement or a variable uptake of radiogenic lead by basinal brines during passage through the basement. The mixing trend defined by the isotopic composition of lead in cubic galena from the Viburnum Trend does not pass as close to the isotopic composition of lead in basinal brines as do the mixing lines defined by the isotopic composition of lead in the octahedral galenas. The composition of lead in the galena cubes may reflect the influence of the dissolution of earlier galena, and is probably best interpreted as a three component mixture of lead derived from basinal brines, the Precambrian basement, and earlier generations of galena.

• Research Organization: Harvard Univ., Cambridge, MA (USA)
• OSTI ID: 6643614
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
BASEMENT ROCK
BRINES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
FEDERAL REGION VII
GALENA
GEOCHEMISTRY
GEOLOGIC MODELS
ISOTOPE RATIO
LEAD COMPOUNDS
LEAD ORES
LEAD SULFIDES
MINERALIZATION
MINERALS
MISSOURI
NORTH AMERICA
ORES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
USA