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GEOREF RECORD

Influence of preexisiting tectonic trends on geometries of Sevier orogenic belt and its foreland in Utah

Frank Picha and Richard I. Gibson
Influence of preexisiting tectonic trends on geometries of Sevier orogenic belt and its foreland in Utah (in AAPG Rocky Mountain Section meeting, Anonymous)
AAPG Bulletin (May 1985) 69 (5): 859

Abstract

The tectonic style of the late Mesozoic Sevier orogenic belt in Utah was greatly affected by preexisting structural trends that date from the late Precambrian rifting and fragmentation of the North American continent. The late Precambrian cratonic margin (Cordilleran hinge line) was marked by a system of prominent faults including the north-south-trending ancestral Wasatch and ancient Ephraim faults and the southwest-northeast-trending Leamington, Scipio, Cove Fort, and Paragonah faults. During the Paleozoic and Mesozoic, renewed activity on these faults affected the geometries of the late Paleozoic Paradox and Oquirrh basins, the boundaries of the Jurassic Arapien Formation, and the sedimentary pattern of the Cretaceous foreland basin. Many of these fault zones were reactivated as tectonic ramps (e.g., the ancient Ephraim fault) and tear faults (e.g., the Leamington fault) during the compressional Sevier tectonism. The Fillmore arch and some other structural highs situated along the edge of the late Precambrian craton caused ramping of the inner Keystone-Pavant-Canyon thrust sheets and telescoping of the frontal thrust sheets. Post-thrust uplift of basement highs led to tectonic denudation and to the development of low-angle, extensional faults, such as the Sevier detachment. Northeast-trending lineaments, such as the Cove Fort and Paragonah lineaments, were reactivated as right-lateral strike-slip faults. They also affected the extent of the Marysvale volcanic field.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 69
Serial Issue: 5
Title: Influence of preexisiting tectonic trends on geometries of Sevier orogenic belt and its foreland in Utah
Title: AAPG Rocky Mountain Section meeting
Author(s): Picha, FrankGibson, Richard I.
Author(s): Anonymous
Affiliation: Gulf Oil Explor. and Prod. Co., Houston, TX, United States
Pages: 859
Published: 198505
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG Rocky Mountain Section meeting
Meeting location: Denver, CO, USA, United States
Meeting date: 19850602June 2-5, 1985
Summary: Y
Accession Number: 1986-035404
Categories: Structural geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
N37°00'00" - N42°00'00", W114°04'60" - W109°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1986
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