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GEOREF RECORD

Na-Cl-Br systematics of mineralizing brines in mississippi valley-type deposits

Stephen E. Kesler, Martin S. Appold, Anna M. Martini, Lynn M. Walter, Ted J. Huston and J. Richard Kyle
Na-Cl-Br systematics of mineralizing brines in mississippi valley-type deposits
Geology (Boulder) (July 1995) 23 (7): 641-644

Abstract

New and published analyses of fluid-inclusion leachates from Mississippi Valley-type (MVT) deposits can be divided into two groups on the basis of Na/Br and Cl/Br ratios. MVT leachates from the Illinois-Kentucky and Cincinnati arch districts and from cubic galena in the Viburnum Trend have Na/Br and Cl/Br ratios that extend to values significantly above that of seawater, which are characteristic of evaporite-dissolution brines. MVT leachates from Polaris and octahedral galena in the Viburnum Trend have Na/Br and Cl/Br ratios that plot below seawater and along the compositional trend formed by evaporation. Solubility-volume constraints require that brines formed by seawater evaporation had high dissolved metal contents. Preliminary correlation of leachate compositions allows delineation of two brine provinces in the midcontinent United States: (1) an early, high-Br province found only in southeastern Missouri, and (2) a later, low-Br province of probable Permian age that extended from the Cincinnati arch to the Tri-State district. These observations, along with Na-Cl-Br data for modern brines from the Illinois basin, argue against models for single-stage midcontinent MVT brine flow based on recharge from late Paleozoic (Arkoma) foreland basins to the south.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 23
Serial Issue: 7
Title: Na-Cl-Br systematics of mineralizing brines in mississippi valley-type deposits
Affiliation: University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
Pages: 641-644
Published: 199507
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 33
Accession Number: 1995-048958
Categories: Economic geology, general, depositsHydrochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N37°00'00" - N42°30'00", W91°30'00" - W87°30'00"
N36°30'00" - N39°10'00", W89°40'00" - W82°00'00"
Secondary Affiliation: University of Texas at Austin, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199518
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