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GEOREF RECORD

Depositional environment, petrology, and provenance of the Santa Clara Formation, Upper Triassic Barranca Group, eastern Sonora, Mexico

Isabelle Cojan and Paul Edwin Potter
Depositional environment, petrology, and provenance of the Santa Clara Formation, Upper Triassic Barranca Group, eastern Sonora, Mexico (in Studies of Sonoran geology, Efren Perez-Segura (editor) and Cesar Jacques-Ayala (editor))
Special Paper - Geological Society of America (1991) 254: 37-50

Abstract

The depositional environment and provenance of the Santa Clara Formation of the Upper Triassic Barranca Group in eastern Sonora were studied based on a detailed description of 875 m of section and study of 123 thin sections from both outcrops and cores. The Santa Clara Formation is a cyclic unit with typical fluvial cycles of 4 to 16 m. Highly altered, quartz-rich sandstone is interbedded with black and gray shale and minor beds of graphite and anthracite, which were formerly mined. Detrital chert and remobilized chert cement are significant features of the sandstones of the Barranca. Diagenesis is extensive, of high rank, and commonly blurs the distinction between primary detrital matrix and chemical cement to produce a predominance of quartz-rich wacke. A quiescent basin with tropical climate, subdued marginal relief, and no active volcanism is inferred for the Santa Clara, and limited crossbedding measurements indicate a source to the north. Basin type and its relation to other Upper Triassic deposits remain major problems.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 254
Title: Depositional environment, petrology, and provenance of the Santa Clara Formation, Upper Triassic Barranca Group, eastern Sonora, Mexico
Title: Studies of Sonoran geology
Author(s): Cojan, IsabellePotter, Paul Edwin
Author(s): Perez-Segura, Efreneditor
Author(s): Jacques-Ayala, Cesareditor
Affiliation: Ec. Mines Paris, C.G.C.M. Sediment., Fontainebleau, France
Affiliation: Univ. Sonora, Dep. Geol., Hermosillo, Mexico
Pages: 37-50
Published: 1991
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2254-3
References: 38
Accession Number: 1991-075636
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 2 tables, sketch maps
N26°30'00" - N32°30'00", W115°04'60" - W108°30'00"
Secondary Affiliation: Univ. Nac. Auton. Mex., MEX, MexicoUniv. Cincinnati, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1991
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