Episodic continental arc magmatism: Tempos of the Peruvian arc
The Phanerozoic American Cordillera provides an excellent opportunity to study processes contributing to the creation of continental crust. The rate of magma emplacement into the arc over time is non-steady, being composed of a series of high magma addition “flare-ups” against an intermittent and va...
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| Formato: | Artículo |
| Lenguaje: | inglés |
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2026
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| author | Lance R. Pompe Ana María Martínez Ardila Benjamin L. Clausen Scott R. Paterson Orlando Poma |
| author_browse | Ana María Martínez Ardila Benjamin L. Clausen Lance R. Pompe Orlando Poma Scott R. Paterson |
| author_facet | Lance R. Pompe Ana María Martínez Ardila Benjamin L. Clausen Scott R. Paterson Orlando Poma |
| author_sort | Lance R. Pompe |
| collection | Producción científica |
| description | The Phanerozoic American Cordillera provides an excellent opportunity to study processes contributing to the creation of continental crust. The rate of magma emplacement into the arc over time is non-steady, being composed of a series of high magma addition “flare-ups” against an intermittent and variable lower level of background magmatism, or “lulls”. We add new U-Pb ages for igneous bedrock samples and detrital zircons from sedimentary rocks to existing geochronological data to describe the magmatic history of the Peruvian arc. Detrital zircons from three sedimentary samples collected from locations in the west, center and east of the arc show across-arc magmatic variation patterns. Flare-ups in magmatism from segments of the Peruvian Coastal Batholith (PCB) and Eastern Cordillera (EC) are analyzed to estimate the volume and rate of mantle magma addition (MMA) to the crust. Average flare-up duration is longer for the EC than for the PCB at ∼57 vs ∼27 My. Flare-ups are found to have variable durations from ∼15 to ∼64 My with variable periodicity, thus being episodic in nature rather than cyclic. Magma volumes are calculated from map data, crustal thickness estimates based on element ratios, and an empirical study of tilted crustal sections. Total MMA volume added to the arc crust during flare-ups and lulls is estimated at ∼2500k km 3 for the PCB and EC, a rate of ∼6500 km 3 per My, assuming a mantle/crust ratio of 65/35. Societal impacts of high flux magmatism and implications of magma episodicity on the continental subduction system environment are considered. |
| format | Article |
| id | openalex:W7165139175 |
| institution | UPeU |
| language | English |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| record_format | dspace |
| spelling | openalex:W7165139175Episodic continental arc magmatism: Tempos of the Peruvian arcLance R. PompeAna María Martínez ArdilaBenjamin L. ClausenScott R. PatersonOrlando Pomaepisodic magmatismcontinental arc magmatismEastern Cordilleradetrital zirconU-Pb geochronologyflare-upscrustal growthcrustal thicknesssubduction zonemagma fluxGeological and Geochemical AnalysisGeological and Tectonic Studies in Latin AmericaGeological and Geophysical StudiesThe Phanerozoic American Cordillera provides an excellent opportunity to study processes contributing to the creation of continental crust. The rate of magma emplacement into the arc over time is non-steady, being composed of a series of high magma addition “flare-ups” against an intermittent and variable lower level of background magmatism, or “lulls”. We add new U-Pb ages for igneous bedrock samples and detrital zircons from sedimentary rocks to existing geochronological data to describe the magmatic history of the Peruvian arc. Detrital zircons from three sedimentary samples collected from locations in the west, center and east of the arc show across-arc magmatic variation patterns. Flare-ups in magmatism from segments of the Peruvian Coastal Batholith (PCB) and Eastern Cordillera (EC) are analyzed to estimate the volume and rate of mantle magma addition (MMA) to the crust. Average flare-up duration is longer for the EC than for the PCB at ∼57 vs ∼27 My. Flare-ups are found to have variable durations from ∼15 to ∼64 My with variable periodicity, thus being episodic in nature rather than cyclic. Magma volumes are calculated from map data, crustal thickness estimates based on element ratios, and an empirical study of tilted crustal sections. Total MMA volume added to the arc crust during flare-ups and lulls is estimated at ∼2500k km 3 for the PCB and EC, a rate of ∼6500 km 3 per My, assuming a mantle/crust ratio of 65/35. Societal impacts of high flux magmatism and implications of magma episodicity on the continental subduction system environment are considered.Articlehttps://doi.org/10.1016/j.jsames.2026.106151W7165139175enJournal of South American Earth Sciences0895-98111873-06472026-06-19 |
| spellingShingle | episodic magmatism continental arc magmatism Eastern Cordillera detrital zircon U-Pb geochronology flare-ups crustal growth crustal thickness subduction zone magma flux Geological and Geochemical Analysis Geological and Tectonic Studies in Latin America Geological and Geophysical Studies Lance R. Pompe Ana María Martínez Ardila Benjamin L. Clausen Scott R. Paterson Orlando Poma Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title | Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title_full | Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title_fullStr | Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title_full_unstemmed | Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title_short | Episodic continental arc magmatism: Tempos of the Peruvian arc |
| title_sort | episodic continental arc magmatism tempos of the peruvian arc |
| topic | episodic magmatism continental arc magmatism Eastern Cordillera detrital zircon U-Pb geochronology flare-ups crustal growth crustal thickness subduction zone magma flux Geological and Geochemical Analysis Geological and Tectonic Studies in Latin America Geological and Geophysical Studies |
| topic_facet | episodic magmatism continental arc magmatism Eastern Cordillera detrital zircon U-Pb geochronology flare-ups crustal growth crustal thickness subduction zone magma flux Geological and Geochemical Analysis Geological and Tectonic Studies in Latin America Geological and Geophysical Studies |
| url | https://doi.org/10.1016/j.jsames.2026.106151 |
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