Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling
Abstract An outstanding question in the geological evolution of the Chilean Andes is the cause of the westward shift and relocation of magmatism from the High Andes (HA) to the Coastal Cordillera (CC) during the Late Triassic, Pre–Andean stage. The spatiotemporal distribution of Permian–Triassic–Jur...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-11-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2024GL110360 |
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| _version_ | 1849705532651208704 |
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| author | Harim Arvizu Vlad Constantin Manea Verónica Oliveros Paulina Vásquez |
| author_facet | Harim Arvizu Vlad Constantin Manea Verónica Oliveros Paulina Vásquez |
| author_sort | Harim Arvizu |
| collection | DOAJ |
| description | Abstract An outstanding question in the geological evolution of the Chilean Andes is the cause of the westward shift and relocation of magmatism from the High Andes (HA) to the Coastal Cordillera (CC) during the Late Triassic, Pre–Andean stage. The spatiotemporal distribution of Permian–Triassic–Jurassic igneous rocks in northern‐central Chile (20°S–32°S) reveals a significant westward magmatic shift of ∼120 km during the Norian time. Despite diverse proposed models, the precise geodynamic mechanism behind this shift remains unclear. To address this, we used 2D numerical modeling to investigate two contrasting scenarios: (a) subduction rollback and (b) subduction transference/jump and reinitiation by terrane accretion. Our modeling results strongly support Scenario B, where mantle density and the size of the oceanic plateau are crucial for triggering subduction jump and reinitiation. This model aligns with geological and geophysical evidence and offers new insights into unraveling the Pre– and Early–Andean evolution. |
| format | Article |
| id | doaj-art-3cb04071627e43c390baec74fbded53e |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-3cb04071627e43c390baec74fbded53e2025-08-20T03:16:26ZengWileyGeophysical Research Letters0094-82761944-80072024-11-015121n/an/a10.1029/2024GL110360Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical ModelingHarim Arvizu0Vlad Constantin Manea1Verónica Oliveros2Paulina Vásquez3Computational Geodynamics Laboratory Instituto de Geociencias Universidad Nacional Autónoma de México Querétaro MéxicoComputational Geodynamics Laboratory Instituto de Geociencias Universidad Nacional Autónoma de México Querétaro MéxicoDepartamento de Ciencias de La Tierra Universidad de Concepción Concepción ChileServicio Nacional de Geología y Minería Santiago ChileAbstract An outstanding question in the geological evolution of the Chilean Andes is the cause of the westward shift and relocation of magmatism from the High Andes (HA) to the Coastal Cordillera (CC) during the Late Triassic, Pre–Andean stage. The spatiotemporal distribution of Permian–Triassic–Jurassic igneous rocks in northern‐central Chile (20°S–32°S) reveals a significant westward magmatic shift of ∼120 km during the Norian time. Despite diverse proposed models, the precise geodynamic mechanism behind this shift remains unclear. To address this, we used 2D numerical modeling to investigate two contrasting scenarios: (a) subduction rollback and (b) subduction transference/jump and reinitiation by terrane accretion. Our modeling results strongly support Scenario B, where mantle density and the size of the oceanic plateau are crucial for triggering subduction jump and reinitiation. This model aligns with geological and geophysical evidence and offers new insights into unraveling the Pre– and Early–Andean evolution.https://doi.org/10.1029/2024GL110360 |
| spellingShingle | Harim Arvizu Vlad Constantin Manea Verónica Oliveros Paulina Vásquez Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling Geophysical Research Letters |
| title | Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling |
| title_full | Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling |
| title_fullStr | Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling |
| title_full_unstemmed | Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling |
| title_short | Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling |
| title_sort | unraveling the geodynamic evolution of the pre and early andean margin insights from numerical modeling |
| url | https://doi.org/10.1029/2024GL110360 |
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