The real McCoy: A record of deep‐water basin deposition in southwestern North America during the Cretaceous.
| Title: | The real McCoy: A record of deep‐water basin deposition in southwestern North America during the Cretaceous. |
|---|---|
| Authors: | Caylor, Emilia A.1 (AUTHOR) emiliacaylor@arizona.edu, Carrapa, Barbara1 (AUTHOR), DeCelles, Peter G.1 (AUTHOR), Gehrels, George E.1 (AUTHOR) |
| Source: | Basin Research. Sep/Oct2024, Vol. 36 Issue 5, p1-31. 31p. |
| Subject Terms: | *SETTLING basins, *ALLUVIUM, *TURBIDITES, *GEOLOGICAL time scales, *OROGENIC belts |
| Abstract: | The McCoy Mountains Formation (McMF) in southern California–Arizona preserves an anomalously thick record of sedimentation during the Mesozoic at a critical time when western North America experienced contrasting tectonic events related to intracontinental rifting along the Mexican Border rift system and consolidation of the North American Cordilleran system. The spaciotemporal interactions among these events and the development of the McCoy basin challenge our understanding of the evolution of the southern extent of North America. At its type locality in the McCoy Mountains, the McMF consists of ~ 7 km of low‐grade metasedimentary rocks, originally interpreted as meandering fluvial to alluvial‐fan deposits. Uncertainty in the initial timing of sedimentation in the McCoy basin has resulted in multiple tectonic models. We measured ~ 7160 m of detailed stratigraphy and present new sedimentological and detrital zircon results showing that the McCoy basin was occupied by deep‐water turbidite systems. These systems deposited an upward‐coarsening succession of fine‐ to coarse‐grained detritus during the Cretaceous (ca. 137–70 Ma). Provenance data indicate that the McCoy basin received sediment from Proterozoic basement rocks and metamorphosed Palaeozoic to early Mesozoic sedimentary units. These source rocks are equivalent to the stratigraphy found in the Grand Canyon and Colorado Plateau regions and were likely shed from the southward‐advancing Maria fold‐thrust belt and possibly the southern Sevier belt in southern Nevada and California. These results, combined with subsidence curves typical of foreland basins, favour deposition within a subaqueous flexural foreland basin system. The presence of a Cretaceous foreland basin this far southwest challenges previously proposed models and suggests that the contractional tectonic regime associated with the North American Cordillera extended into the southwestern most United States during the Early–Late Cretaceous. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: The real McCoy: A record of deep‐water basin deposition in southwestern North America during the Cretaceous. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Caylor%2C+Emilia+A%2E%22">Caylor, Emilia A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> emiliacaylor@arizona.edu</i><br /><searchLink fieldCode="AR" term="%22Carrapa%2C+Barbara%22">Carrapa, Barbara</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22DeCelles%2C+Peter+G%2E%22">DeCelles, Peter G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gehrels%2C+George+E%2E%22">Gehrels, George E.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Basin+Research%22">Basin Research</searchLink>. Sep/Oct2024, Vol. 36 Issue 5, p1-31. 31p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22SETTLING+basins%22">SETTLING basins</searchLink><br />*<searchLink fieldCode="DE" term="%22ALLUVIUM%22">ALLUVIUM</searchLink><br />*<searchLink fieldCode="DE" term="%22TURBIDITES%22">TURBIDITES</searchLink><br />*<searchLink fieldCode="DE" term="%22GEOLOGICAL+time+scales%22">GEOLOGICAL time scales</searchLink><br />*<searchLink fieldCode="DE" term="%22OROGENIC+belts%22">OROGENIC belts</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The McCoy Mountains Formation (McMF) in southern California–Arizona preserves an anomalously thick record of sedimentation during the Mesozoic at a critical time when western North America experienced contrasting tectonic events related to intracontinental rifting along the Mexican Border rift system and consolidation of the North American Cordilleran system. The spaciotemporal interactions among these events and the development of the McCoy basin challenge our understanding of the evolution of the southern extent of North America. At its type locality in the McCoy Mountains, the McMF consists of ~ 7 km of low‐grade metasedimentary rocks, originally interpreted as meandering fluvial to alluvial‐fan deposits. Uncertainty in the initial timing of sedimentation in the McCoy basin has resulted in multiple tectonic models. We measured ~ 7160 m of detailed stratigraphy and present new sedimentological and detrital zircon results showing that the McCoy basin was occupied by deep‐water turbidite systems. These systems deposited an upward‐coarsening succession of fine‐ to coarse‐grained detritus during the Cretaceous (ca. 137–70 Ma). Provenance data indicate that the McCoy basin received sediment from Proterozoic basement rocks and metamorphosed Palaeozoic to early Mesozoic sedimentary units. These source rocks are equivalent to the stratigraphy found in the Grand Canyon and Colorado Plateau regions and were likely shed from the southward‐advancing Maria fold‐thrust belt and possibly the southern Sevier belt in southern Nevada and California. These results, combined with subsidence curves typical of foreland basins, favour deposition within a subaqueous flexural foreland basin system. The presence of a Cretaceous foreland basin this far southwest challenges previously proposed models and suggests that the contractional tectonic regime associated with the North American Cordillera extended into the southwestern most United States during the Early–Late Cretaceous. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Basin Research is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/bre.12902 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 31 StartPage: 1 Subjects: – SubjectFull: SETTLING basins Type: general – SubjectFull: ALLUVIUM Type: general – SubjectFull: TURBIDITES Type: general – SubjectFull: GEOLOGICAL time scales Type: general – SubjectFull: OROGENIC belts Type: general Titles: – TitleFull: The real McCoy: A record of deep‐water basin deposition in southwestern North America during the Cretaceous. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Caylor, Emilia A. – PersonEntity: Name: NameFull: Carrapa, Barbara – PersonEntity: Name: NameFull: DeCelles, Peter G. – PersonEntity: Name: NameFull: Gehrels, George E. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep/Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 0950091X Numbering: – Type: volume Value: 36 – Type: issue Value: 5 Titles: – TitleFull: Basin Research Type: main |
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