Magmatic surge requires two-stage model for the Laramide orogeny
Abstract The Laramide orogeny is a pivotal time in the geological development of western North America, but its driving mechanism is controversial. Most prominent models suggest this event was caused by the collision of an oceanic plateau with the Southern California Batholith (SCB) which caused the...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-06-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-39473-7 |
| _version_ | 1797789695011192832 |
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| author | Joshua J. Schwartz Jade Star Lackey Elena A. Miranda Keith A. Klepeis Gabriela Mora-Klepeis Francine Robles Jonathan D. Bixler |
| author_facet | Joshua J. Schwartz Jade Star Lackey Elena A. Miranda Keith A. Klepeis Gabriela Mora-Klepeis Francine Robles Jonathan D. Bixler |
| author_sort | Joshua J. Schwartz |
| collection | DOAJ |
| description | Abstract The Laramide orogeny is a pivotal time in the geological development of western North America, but its driving mechanism is controversial. Most prominent models suggest this event was caused by the collision of an oceanic plateau with the Southern California Batholith (SCB) which caused the angle of subduction beneath the continent to shallow and led to shut-down of the arc. Here, we use over 280 zircon and titanite Pb/U ages from the SCB to establish the timing and duration of magmatism, metamorphism and deformation. We show that magmatism was surging in the SCB from 90 to 70 Ma, the lower crust was hot, and cooling occurred after 75 Ma. These data contradict plateau underthrusting and flat-slab subduction as the driving mechanism for early Laramide deformation. We propose that the Laramide orogeny is a two-stage event consisting of: 1) an arc ‘flare-up’ phase in the SCB from 90-75 Ma; and 2) a widespread mountain building phase in the Laramide foreland belt from 75-50 Ma that is linked to subduction of an oceanic plateau. |
| first_indexed | 2024-03-13T01:54:20Z |
| format | Article |
| id | doaj.art-43d7a47020694f6ab7227d8b5f54b8c3 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-13T01:54:20Z |
| publishDate | 2023-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-43d7a47020694f6ab7227d8b5f54b8c32023-07-02T11:19:39ZengNature PortfolioNature Communications2041-17232023-06-0114111110.1038/s41467-023-39473-7Magmatic surge requires two-stage model for the Laramide orogenyJoshua J. Schwartz0Jade Star Lackey1Elena A. Miranda2Keith A. Klepeis3Gabriela Mora-Klepeis4Francine Robles5Jonathan D. Bixler6Department of Geological Sciences, California State University NorthridgeGeology Department, Pomona CollegeDepartment of Geological Sciences, California State University NorthridgeDepartment of Geography & Geosciences, The University of VermontDepartment of Geography & Geosciences, The University of VermontDepartment of Geological Sciences, California State University NorthridgeDepartment of Geological Sciences, California State University NorthridgeAbstract The Laramide orogeny is a pivotal time in the geological development of western North America, but its driving mechanism is controversial. Most prominent models suggest this event was caused by the collision of an oceanic plateau with the Southern California Batholith (SCB) which caused the angle of subduction beneath the continent to shallow and led to shut-down of the arc. Here, we use over 280 zircon and titanite Pb/U ages from the SCB to establish the timing and duration of magmatism, metamorphism and deformation. We show that magmatism was surging in the SCB from 90 to 70 Ma, the lower crust was hot, and cooling occurred after 75 Ma. These data contradict plateau underthrusting and flat-slab subduction as the driving mechanism for early Laramide deformation. We propose that the Laramide orogeny is a two-stage event consisting of: 1) an arc ‘flare-up’ phase in the SCB from 90-75 Ma; and 2) a widespread mountain building phase in the Laramide foreland belt from 75-50 Ma that is linked to subduction of an oceanic plateau.https://doi.org/10.1038/s41467-023-39473-7 |
| spellingShingle | Joshua J. Schwartz Jade Star Lackey Elena A. Miranda Keith A. Klepeis Gabriela Mora-Klepeis Francine Robles Jonathan D. Bixler Magmatic surge requires two-stage model for the Laramide orogeny Nature Communications |
| title | Magmatic surge requires two-stage model for the Laramide orogeny |
| title_full | Magmatic surge requires two-stage model for the Laramide orogeny |
| title_fullStr | Magmatic surge requires two-stage model for the Laramide orogeny |
| title_full_unstemmed | Magmatic surge requires two-stage model for the Laramide orogeny |
| title_short | Magmatic surge requires two-stage model for the Laramide orogeny |
| title_sort | magmatic surge requires two stage model for the laramide orogeny |
| url | https://doi.org/10.1038/s41467-023-39473-7 |
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