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Zeolite mineral reactions in a tuff in the Laney Member of the Green River Formation, Wyoming

Nancy G. Ratterman and Ronald C. Surdam
Zeolite mineral reactions in a tuff in the Laney Member of the Green River Formation, Wyoming (in Zeolites from sedimentary rocks, Richard A. Sheppard (prefacer) and F. A. Mumpton (prefacer))
Clays and Clay Minerals (October 1981) 29 (5): 365-377


Two diagenetic stages of zeolitic alteration were recognized in a study of a thin bed of rhyolitic ash that was deposited in Eocene Lake Gosiute (Laney Member of the Green River Formation). The ash bed can be traced for 30 km along strike and represents a single volcanic event. The bed was not buried deeply (<100 degrees C), and originally it was compositionally homogeneous. Initially, the bed altered to clinoptilolite, heulandite, an intermediate phase between these two zeolites, and mordenite. These early reactions involved the hydration and solution of glass by saline, alkaline solutions and the subsequent precipitation of zeolites. The variation in zeolite mineralogy is due to differences in interstitial fluid chemistry that resuited from either fluctuations in lake-water chemistry or the proximity of spring discharge. These reactions, exclusive of the addition of H (sub 2) O, involved only minor amounts of mass transfer over very small distances. Later, after burial, the early-formed zeolites reacted with upward moving sodium carbonate brines that were produced by dewatering of underlying evaporite deposits. The sodium carbonate brines, in equilibrium with trona and nahcolite, elevated the activity of Na (super +) and produced analcime. These later dehydration reactions involved significant mass transfer.

ISSN: 0009-8604
Serial Title: Clays and Clay Minerals
Serial Volume: 29
Serial Issue: 5
Serial Info: Zeolite issue
Title: Zeolite mineral reactions in a tuff in the Laney Member of the Green River Formation, Wyoming
Title: Zeolites from sedimentary rocks
Author(s): Ratterman, Nancy G.Surdam, Ronald C.
Author(s): Sheppard, Richard A.prefacer
Author(s): Mumpton, F. A.prefacer
Affiliation: Univ. Wyo., Dep. Geol., Laramie, WY, United States
Affiliation: U. S. Geol. Surv., Denver, CO, United States
Pages: 365-377
Published: 198110
Text Language: English
Summary Language: Russian
Summary Language: German
Summary Language: French
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 31
Accession Number: 1982-029727
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 19 anal., 4 tables, sketch map
N41°00'00" - N41°40'00", W108°45'00" - W107°55'00"
Secondary Affiliation: N.Y. State Univ. Coll., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1982
Program Name: USGSOPNon-USGS publications with USGS authors
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