2022
DOI: 10.1130/abs/2022am-382983
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Spatial and Temporal Overlap of Structural Styles in the Highland Mountains, Montana, Usa: An Example of Collaboration Between the Montana Bureau of Mines and Geology and Usgs Edmap Program Participants

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“…However, recent timing constraints from southwest Montana and northern Wyoming demonstrate basement uplift in the region likely initiated significantly prior to the inferred timing of regional insertion of a flat slab. Steidtmann and Middleton (1991) presented evidence for uplift in the Wind River Range as early as 110 Ma, which to them “suggest(ed) either a pre‐Laramide event of unknown origin or that Laramide crustal shortening began nearly 35 Myr earlier than commonly assumed.” In southwest Montana, sedimentologic and thermochronologic work has produced additional evidence for Aptian–Coniacian exhumation of several basement uplifts—including the Highland, Madison, Blacktail‐Snowcrest, and Beartooth mountains (Carrapa et al., 2019; DeCelles, 1986; Garber et al., 2020; Haley, 1985; Ronemus & Orme, 2022; summarized by Orme, 2020). Our results add additional thermochronologic evidence suggesting likely fault‐related exhumation of the Beartooth Mountains by at least ∼90 Ma.…”
Section: Discussionmentioning
confidence: 99%
“…However, recent timing constraints from southwest Montana and northern Wyoming demonstrate basement uplift in the region likely initiated significantly prior to the inferred timing of regional insertion of a flat slab. Steidtmann and Middleton (1991) presented evidence for uplift in the Wind River Range as early as 110 Ma, which to them “suggest(ed) either a pre‐Laramide event of unknown origin or that Laramide crustal shortening began nearly 35 Myr earlier than commonly assumed.” In southwest Montana, sedimentologic and thermochronologic work has produced additional evidence for Aptian–Coniacian exhumation of several basement uplifts—including the Highland, Madison, Blacktail‐Snowcrest, and Beartooth mountains (Carrapa et al., 2019; DeCelles, 1986; Garber et al., 2020; Haley, 1985; Ronemus & Orme, 2022; summarized by Orme, 2020). Our results add additional thermochronologic evidence suggesting likely fault‐related exhumation of the Beartooth Mountains by at least ∼90 Ma.…”
Section: Discussionmentioning
confidence: 99%