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Controlling factors for differential subsidence in the Sonoma foreland basin (Early Triassic, Western USA)

Gwenael Caravaca, Arnaud Brayard, Emmanuelle Vennin, Michel Guiraud, Laetitia Le Pourhiet, Anne-Sabine Grosjean, Christophe Thomazo, Nicolas Olivier, Emmanuel Fara, Gilles Escarguel, Kevin G. Bylund, James F. Jenks and Daniel A. Stephen
Controlling factors for differential subsidence in the Sonoma foreland basin (Early Triassic, Western USA)
Geological Magazine (September 2018) 155 (6): 1305-1329

Abstract

Sediments deposited from the Permian-Triassic boundary ( approximately 252 Ma) until the end-Smithian (Early Triassic; c. 250.7 Ma) in the Sonoma Foreland Basin show marked thickness variations between its southern (up to c. 250 m thick) and northern (up to c. 550 m thick) parts. This basin formed as a flexural response to the emplacement of the Golconda Allochthon during the Sonoma orogeny. Using a high-resolution backstripping approach, a numerical model and sediment thickness to obtain a quantitative subsidence analysis, we discuss the controlling factor(s) responsible for spatial variations in thickness. We show that sedimentary overload is not sufficient to explain the significant discrepancy observed in the sedimentary record of the basin. We argue that the inherited rheological properties of the basement terranes and spatial heterogeneity of the allochthon are of paramount importance in controlling the subsidence and thickness spatial distribution across the Sonoma Foreland Basin.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 155
Serial Issue: 6
Title: Controlling factors for differential subsidence in the Sonoma foreland basin (Early Triassic, Western USA)
Affiliation: Universite Bourgogne Franche-Comte, Laboratoire Biogeosciences, Dijon, France
Pages: 1305-1329
Published: 201809
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 119
Accession Number: 2019-005226
Categories: Structural geologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N40°25'00" - N40°55'00", W112°15'00" - W111°34'60"
Secondary Affiliation: Pierre and Marie Curie University, FRA, FranceUniversite Blaise Pascal, FRA, FranceUniversite Lyon I, FRA, FranceUtah Valley University, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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