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GEOREF RECORD

Ordovician Aleman ribbon cherts; an example of silicification prior to carbonate lithification

Jill H. Geeslin and Henry S. Chafetz
Ordovician Aleman ribbon cherts; an example of silicification prior to carbonate lithification
Journal of Sedimentary Petrology (December 1982) 52 (4): 1283-1293

Abstract

The Aleman Formation, New Mexico, is primarily dolomite with ribbons of chert. Stromatolites, relict evaporite nodules, and other features indicate an intertidal to shallow subtidal depositional environment. Stromatolitic layers are preferentially silicified with dissolution of opaline sponge spicules providing the main source of silica. Silicification was penecontemporaneous with accumulation of the sediment and concomitant with dolomitization. This is indicated by the preservation in silicified form of original anhydrite lath morphology, central cavities in chert nodules partially filled with geopetal matrix dolomite, and matrix dolomite immediately adjacent to conchoidal fractures of silicified carbonate grainstones. The latter relationship indicates that the chert was rigid and fractured before the carbonate host-sediments were lithified.--Modified journal abstract.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 52
Serial Issue: 4
Title: Ordovician Aleman ribbon cherts; an example of silicification prior to carbonate lithification
Affiliation: Univ. Houston, Dep. Geosci., Houston, TX, United States
Pages: 1283-1293
Published: 198212
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 45
Accession Number: 1983-037476
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N32°46'60" - N32°46'60", W108°16'00" - W108°16'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1983
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