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GEOREF RECORD

Lower Jurassic Navajo-Aztec-equivalent sandstones in southern Arizona and their paleogeographic significance

William L. Bilodeau and Stanley B. Keith
Lower Jurassic Navajo-Aztec-equivalent sandstones in southern Arizona and their paleogeographic significance
AAPG Bulletin (June 1986) 70 (6): 690-701

Abstract

Thick sequences of Lower Jurassic rhyolitic and andesitic volcanic rocks in several mountain ranges of southern Arizona contain interbedded quartzarenites. Locally up to 250 m thick, these sandstone lenses, composed of well-sorted and well-rounded quartz grains, commonly contain large-scale cross-stratification and are considered to be eolian sand deposits. The eolian sands were blown up against the continental side of the Early Jurassic volcanic arc that trended northwest-southeast across the southwestern margin of the North American continent and/or plate at that time. Paleocurrent data suggest southerly eolian transport of the sands from the Colorado Plateau area. Correlation of these sandstones with the Lower Jurassic Navajo and Aztec Sandstones is indicated by the paleocurrent data as well as radiometric dating of the interbedded volcanics. Eolian sand transport southward across central Arizona in the Early Jurassic indicates that the Mogollon highlands either did not then exist, or were merely low, discontinuous inselbergs on a broad back-arc ramp, more appropriately called the Mogollon slope.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 70
Serial Issue: 6
Title: Lower Jurassic Navajo-Aztec-equivalent sandstones in southern Arizona and their paleogeographic significance
Affiliation: Univ. Colo. at Denver, Dep. Geol., Denver, CO, United States
Pages: 690-701
Published: 198606
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 51
Accession Number: 1986-075946
Categories: StratigraphySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N31°19'60" - N32°19'60", W112°30'00" - W109°30'00"
Secondary Affiliation: MagmaChem. Explor., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1986
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