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Mineralogy of the clay-sized fraction of the Davis Shale, Southeast Missouri; alteration associated with a mississippi valley-type ore deposit

Samuel V. Panno and Duane M. Moore
Mineralogy of the clay-sized fraction of the Davis Shale, Southeast Missouri; alteration associated with a mississippi valley-type ore deposit
Economic Geology and the Bulletin of the Society of Economic Geologists (April 1994) 89 (2): 333-340

Abstract

The carbonate-hosted Buick mine Pb-Zn-Cu deposit in the Viburnum Trend, southeast Missouri, is immediately overlain by the shale of the Davis Formation. The mineralogy of clay and clay-sized minerals and selected geochemical aspects of this shale were examined along a traverse normal to the Viburnum Trend. The shale consists of illitc, illite-smectite, mono-clinic K feldspar, and quartz; minor minerals include chlorite, dolomite, calcite, pyrite, and gypsum. Aluminous dioctahedral illite was found to be the dominant clay mineral in the <2-mu m fraction of the shale. Alterations to shale of the Davis Formation within the Viburnum Trend include lowering of the illitc crystallinity index, changes in the amount of K in whole-rock shale samples, and the presence of gypsum in the <2-mu m fraction. The crystallinity index of illite in the Davis shale is lowest over the ore zone of the Buick mine and within the Viburnum Trend relative to samples collected greater than 6 km from the ore zone. Decrease in the illitc crystallinity index may have been penecontemporaneous with the early stages of mineralization, the initial enrichment of Davis shale with metals, and the mobilization of K in the Davis and subjacent formations.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 89
Serial Issue: 2
Title: Mineralogy of the clay-sized fraction of the Davis Shale, Southeast Missouri; alteration associated with a mississippi valley-type ore deposit
Affiliation: Illinois State Geological Survey, Champaign, IL, United States
Pages: 333-340
Published: 199404
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 47
Accession Number: 1994-028373
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 1 table, sketch map
N37°00'00" - N38°00'00", W92°00'00" - W91°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists
Update Code: 199413
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