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Natroalunite in Upper Cretaceous sedimentary rocks, north-central Texas

Clarence S. Ross, Harlan R. Bergquist, Watson H. Monroe, Joseph H. Fahey and Malcolm Ross
Natroalunite in Upper Cretaceous sedimentary rocks, north-central Texas
Journal of Sedimentary Petrology (December 1968) 38 (4): 1155-1165


Natroalunite occurs typically here as thin lenses of nodules in friable sandstone at or near the Eagle Ford-Woodbine disconformity of the Upper Cretaceous. Typical natroalunite has only traces of impurities; it is exceedingly fine-grained but retains a replica of radial plumose structure which is reflected by the cauliflower-like outer form. Thus, the nodules were derived by transformation from material with spherulitic structures. Minor K (sub 2) O is present, and essential Ca, Sr, Ba, Mg, and rare earths. A deficiency of bases is believed to be compensated for by oxonium H (sub 3) O (super +) ions. The natroalunite is believed to have developed under oxidizing conditions, with pyrite as the source of the SO (sub 4) . Experiments suggest its derivation to be from aluminite.

ISSN: 0022-4472
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 38
Serial Issue: 4
Title: Natroalunite in Upper Cretaceous sedimentary rocks, north-central Texas
Pages: 1155-1165
Published: 196812
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
Accession Number: 1968-059198
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., tables
N25°45'00" - N36°30'00", W106°30'00" - W93°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1968
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