Alteration and associated faulting, Sweetwater Mine, Viburnum Trend, southeast Missouri

Conference · Mon Mar 01 04:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:7281341

Walker, W T ^[1]

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1. ASARCO, Inc., Ellington, MO (United States)

Clay-like alteration associated with steeply dipping east-west striking faults is exposed in specific areas within the Sweetwater Mine, which is located at the southern end of the Viburnum Trend in the Southeast Missouri Lead District. The alteration occurs within the fault planes and typically in multicolored bands that extend outward a few centimeters from the faults in a symmetrical halo patterns surrounding the fault planes. The faults typically exhibit minor strike-slip displacement with horizontal slickensides and fault brecciation. Altered breccia fragments within the fault planes suggest that some of the movement is post alteration. For the most part, the east-west faulting and the associated alteration are incongruent relative to prominent north-south ore runs. Locally, the alteration spreads outward from the fault planes into bedding planes and into vug fillings of up to two meters in diameter. The multicolored alteration varies in consistency from solid discolored dolomite to soft clay material in the vug fillings. Recent studies have shown that the alteration is composed principally of sericite, adularia, quartz, and illite. Assay ICP analyses of the chemical composition of the alteration indicate anomalous high copper, lead, and manganese values. Galena mineralization in the fault planes and in association with the alteration, as can best be determined by field relationships, is post-octahedral galena, pre-cubic galena, and pre-chalcopyrite.

• OSTI ID: 7281341
• Report Number(s): CONF-9303210--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:3
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152003 -- Geothermal Data & Theory-- Rock-Water-Gas Interactions
58 GEOSCIENCES
580000* -- Geosciences
DEVELOPED COUNTRIES
GALENA
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
HYDROTHERMAL ALTERATION
HYDROTHERMAL SYNTHESIS
LEAD ORES
MINERALIZATION
MINERALOGY
MINERALS
MISSOURI
NORTH AMERICA
ORES
SULFIDE MINERALS
SYNTHESIS
USA