Journal Articles Geological Magazine Year : 2018

Controlling factors for differential subsidence in the Sonoma Foreland Basin (Early Triassic, western USA)

Arnaud Brayard
Emmanuelle Vennin
Michel Guiraud
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Anne-Sabine Grosjean
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  • IdRef : 181697920
Christophe Thomazo
Nicolas Olivier
Emmanuel Fara

Abstract

Sediments deposited from the Permian–Triassic boundary (~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.
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Dates and versions

hal-01848947 , version 1 (28-01-2022)

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Gwénaël Caravaca, Arnaud Brayard, Emmanuelle Vennin, Michel Guiraud, Laetitia Le Pourhiet, et al.. Controlling factors for differential subsidence in the Sonoma Foreland Basin (Early Triassic, western USA). Geological Magazine, 2018, 155 (6), pp.1305 - 1329. ⟨10.1017/S0016756817000164⟩. ⟨hal-01848947⟩
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