Isotopic and geochemical characterization of fossil brines of the Cambrian Mt. Simon Sandstone and Ironton-Galesville Formation from the Illinois Basin, USA

Geochemical and isotopic characteristics of deep-seated saline groundwater provide valuable insight into the origin and evolving composition, water-rock interaction, and mixing potential of fossil brines. Such information may yield insight into intra- and interbasinal brine movement and relationship... Full description

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doi: 10.1016/j.gca.2015.06.013
Authors:Labotka, D.M.; Panno, S.V.; Locke, R.A.; Freiburg, J.T.
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, Vol.165, p.342-360. Publisher: Elsevier, New York, NY, International. ISSN: 0016-7037
Publication Date:2015
Note:In English. 65 refs.; illus., incl. 6 tables, sketch map
Subjects:Alkaline earth metals; Brines; Cambrian; D/H; Fossil waters; Galesville Sandstone; Ground water; Hydrogen; ICP mass spectra; Isotope ratios; Isotopes; Lithostratigraphy; Mass spectra; Mathematical methods; Metals; Monitoring; Mount Simon Sandstone; O-18/O-16; Oxygen; Paleozoic; Saline composition; Spectra; Sr-87/Sr-86; Stable isotopes; Strontium; Upper Cambrian; Water wells; X-ray diffraction data; Illinois Basin; United States; Ironton Formation; Rough Creek Graben
Coordinates:N360000 N400000 W0860000 W0900000
Record ID:2015093863
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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100 1 |a Labotka, D.M.  |u Illinois State Geological Survey, Champaign, IL 
245 1 0 |a Isotopic and geochemical characterization of fossil brines of the Cambrian Mt. Simon Sandstone and Ironton-Galesville Formation from the Illinois Basin, USA 
300 |a p. 342-360 
500 |a In English. 65 refs. 
500 |a Key title: Geochimica et Cosmochimica Acta 
500 |a Source note: Geochimica et Cosmochimica Acta, Vol.165, p.342-360. Publisher: Elsevier, New York, NY, International. ISSN: 0016-7037 
500 |a Publication type: journal article 
504 |b 65 refs. 
506 1 |a Restricted access 
510 3 |a GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands 
520 |a Geochemical and isotopic characteristics of deep-seated saline groundwater provide valuable insight into the origin and evolving composition, water-rock interaction, and mixing potential of fossil brines. Such information may yield insight into intra- and interbasinal brine movement and relationships between brine evolution and regional groundwater flow systems. This investigation reports on the δ>18`O and δD composition and activity values, >87`Sr/>86`Sr ratios and Sr concentrations, and major ion concentrations of the Cambrian-hosted brines of the Mt. Simon Sandstone and Ironton-Galesville Formation and discusses the evolution of these brines as they relate to other intracontinental brines. Brines in the Illinois Basin are dominated by Na-Ca-Cl-type chemistry. The Mt. Simon and overlying Ironton-Galesville brines exhibit total dissolved solids concentrations of ∼195,000 mg/L and ∼66,270 mg/L, respectively. The δD of brine composition of the Mt. Simon ranges from -34 ppm to -22 ppm (V-SMOW), and the Ironton-Galesville is ∼-53.2 ppm (V-SMOW). The δ>18`O composition of the Mt. Simon brine ranges from -5.0 ppm to -2.8 ppm (V-SMOW), and the Ironton-Galesville brine is ∼-6.9 ppm (V-SMOW). The >87`Sr/>86`Sr values in the Mt. Simon brine range from 0.7110 to 0.7116. The less radiogenic Ironton-Galesville brine has an average >87`Sr/>86`Sr value of 0.7107. Evaluation of δ>18`O and δD composition and activities and >87`Sr/>86`Sr ratios suggests that the Mt. Simon brine is likely connate seawater and recirculating deep-seated brines that have been diluted with meteoric water and influenced by the dissolution of evaporites with a minimal halite contribution based on Cl/Br ratios. The Ironton-Galesville brine is also likely originally connate seawater that mixed with other brines and meteoric waters, including possibly Pleistocene glacial recharge. The Ca-excess vs. Na-deficiency comparison with the Basinal Fluid Line suggests the Mt. Simon and Ironton-Galesville brines have been influenced by the effects of albitization and plot very close to the Basinal Fluid Line. These Cambrian-hosted brines appear to have a different albitization history than other regional basin brines and a strong component of seawater. The Ironton-Galesville brine appears more geochemically associated with other Illinois Basin brines than the Mt. Simon brine which appears more geochemically conservative. Comparisons with other extrabasinal North American brines suggest that the Michigan basin brines are geochemically most similar to the Mt. Simon brines with the exception of the influence from carbonates in the Michigan Basin. Analyses of >87`Sr/>86`Sr values in the Mt. Simon brine suggest that brine Sr has isotopically equilibrated with clay minerals in the Lower Mt. Simon and underlying bedrock formations and not with whole rock suggesting the influence of recirculating brines from the crystalline basement. Overall, the geochemistry of these Cambrian-hosted brines suggests an evolution from original seawater-like compositions. This investigation shows that intracratonic basins do not behave as closed systems but can be strongly affected by water-rock interaction and regional groundwater flow systems that circulate deep crystalline basement brines and brines from nearby basins. Abstract Copyright (2015) Elsevier, B.V. 
650 7 |a Alkaline earth metals  |2 georeft 
650 7 |a Brines  |2 georeft 
650 7 |a Cambrian  |2 georeft 
650 7 |a D/H  |2 georeft 
650 7 |a Fossil waters  |2 georeft 
650 7 |a Galesville Sandstone  |2 georeft 
650 7 |a Ground water  |2 georeft 
650 7 |a Hydrogen  |2 georeft 
650 7 |a ICP mass spectra  |2 georeft 
650 7 |a Isotope ratios  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a Lithostratigraphy  |2 georeft 
650 7 |a Mass spectra  |2 georeft 
650 7 |a Mathematical methods  |2 georeft 
650 7 |a Metals  |2 georeft 
650 7 |a Monitoring  |2 georeft 
650 7 |a Mount Simon Sandstone  |2 georeft 
650 7 |a O-18/O-16  |2 georeft 
650 7 |a Oxygen  |2 georeft 
650 7 |a Paleozoic  |2 georeft 
650 7 |a Saline composition  |2 georeft 
650 7 |a Spectra  |2 georeft 
650 7 |a Sr-87/Sr-86  |2 georeft 
650 7 |a Stable isotopes  |2 georeft 
650 7 |a Strontium  |2 georeft 
650 7 |a Upper Cambrian  |2 georeft 
650 7 |a Water wells  |2 georeft 
650 7 |a X-ray diffraction data  |2 georeft 
651 7 |a Illinois Basin  |2 georeft 
651 7 |a United States  |2 georeft 
653 |a Ironton Formation 
653 |a Rough Creek Graben 
700 1 |a Panno, S.V. 
700 1 |a Locke, R.A. 
700 1 |a Freiburg, J.T. 
773 0 |t Geochimica et Cosmochimica Acta  |d New York, NY : Elsevier, Sep. , 15 2015  |x 0016-7037  |y GCACAK  |n Geochimica et Cosmochimica Acta, Vol.165, p.342-360. Publisher: Elsevier, New York, NY, International. ISSN: 0016-7037  |g Vol. 165  |h illus., incl. 6 tables, sketch map 
856 |u urn:doi: 10.1016/j.gca.2015.06.013