Tectonic evolution of the southwestern margin of Pangea and its global implications: Evidence from the mid Permian–Triassic magmatism along the Chilean-Argentine border

Rey, Álvaro del; Deckart, Katja; Planavsky, Noah J.; Arriagada, César; Martínez, F.

doi:10.1016/j.gr.2019.05.007

Cited by 26 publications

(4 citation statements)

References 59 publications

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“…Spikings et al, 2016), there may have been continuous subduction beneath the Antarctic Peninsula from ~223 Ma into the Jurassic. Further, this would corroborate recent studies that propose the existence of an active margin along the Chilean margin (del Rey et al, 2016(del Rey et al, , 2019Oliveros et al, 2017;Espinoza et al, 2019), includingPatagonia (Navarrete et al, 2019;Suarez et al, 2019). U-Pb concordia ages of zircons within metasedimentary rocks of the Trinity Peninsula Group (Eastern Domain; Fig.…”

Section: Triassic: Tectonic Settingsupporting

confidence: 87%

“…Martin et al, 1999) in the high Chilean Andes and Coastal Cordillera, which yield zircon U-Pb dates that peak between 247 -216 Ma in northern Chile (Maksaev et al, 2014). Recently, Triassic igneous rocks in Central Chile have been interpreted to be subduction-related (Gonzalez et al, 2018;Coloma et al, 2017;Espinoza et al, 2018;del Rey et al 2016del Rey et al , 2019. Late Triassic back-arc plutons in the Acatlán Complex (Mexico; Helbig et al, 2012) were utilised by Cochrane et al (2014) and Spikings et al (2015) to propose that subduction drove rifting along northwestern South America, which was also proposed by Pindell and Tabbutt Journal Pre-proof J o u r n a l P r e -p r o o f (1995).…”

Section: Triassic: Tectonic Settingmentioning

confidence: 99%

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The Gondwanan margin in West Antarctica: Insights from Late Triassic magmatism of the Antarctic Peninsula

et al. 2020

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Section: Triassic: Tectonic Settingsupporting

confidence: 87%

Section: Triassic: Tectonic Settingmentioning

confidence: 99%

The Gondwanan margin in West Antarctica: Insights from Late Triassic magmatism of the Antarctic Peninsula

et al. 2020

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“…The complete amalgamation of the Pangea supercontinent during Permian times and the related decrease in continental drift provided the kinematic and tectonic conditions for the subsequent gravitational collapse of the late Paleozoic Gondwanide Orogen (Franzese & Spalletti, 2001;Howell et al, 2005). During the Late Permian and Early Triassic, extensional reactivation of inherited Paleozoic structures driving major crustal thinning took place in concert with extensive mesosilicic and silicic magmatic activity (e.g., del Rey et al, 2019;Franzese & Spalletti, 2001;Kay et al, 1989;Mpodozis & Kay, 1992). This tectonomagmatic stage has been recently related to the onset of a retreating subduction (del Rey et al, 2016(del Rey et al, , 2019Oliveros, Creixell, et al, 2020) or as produced by a ∼2,800 km-wide slab break-off event that triggered the extrusion of slab failure magmatism of the Choiyoi silicic large igneous province and a regional dynamic uplift along the margin of at least 1 km (G. M. Gianni & Navarrete, 2022).…”

Section: Tectonic Framework Of the Southwestern Pangea Margin Between...mentioning

confidence: 99%

“…During the Late Permian and Early Triassic, extensional reactivation of inherited Paleozoic structures driving major crustal thinning took place in concert with extensive mesosilicic and silicic magmatic activity (e.g., del Rey et al, 2019;Franzese & Spalletti, 2001;Kay et al, 1989;Mpodozis & Kay, 1992). This tectonomagmatic stage has been recently related to the onset of a retreating subduction (del Rey et al, 2016(del Rey et al, , 2019Oliveros, Creixell, et al, 2020) or as produced by a ∼2,800 km-wide slab break-off event that triggered the extrusion of slab failure magmatism of the Choiyoi silicic large igneous province and a regional dynamic uplift along the margin of at least 1 km (G. M. Gianni & Navarrete, 2022). Voluminous magmatic activity at this time was accentuated by high upper mantle temperatures associated with Pangea supercontinent thermal insulation (Kay, 1993;Kay et al, 1989).…”

Section: Tectonic Framework Of the Southwestern Pangea Margin Between...mentioning

confidence: 99%

Origin of Late Triassic Granitoids of the Coastal Cordillera of Southern Central Chile (34°–37°S): Multi‐Isotopic Evidence of Slab Tearing Effects on Pre‐Andean Magmagenesis

et al. 2023

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The Coastal Cordillera of Central Chile (34°–37°S) holds a series of Late Triassic granitoids classically interpreted as early Andean subduction‐related magmatism based on their arc‐like geochemical signature. Here, we present geochemical, isotopic, and geochronological data and a tomotectonic analysis that challenge this idea indicating a local interruption of the normal subduction process likely associated with a slab‐tearing event. Our results suggest that the source of the magmas is related to melting of asthenospheric mantle and crustal rocks of a metasedimentary Paleozoic complex. We suggest that partial melting of these sources was triggered by a slab tear‐related asthenosphere upwelling producing high‐silica S/I‐ and S‐Type granites of the Constitución and Hualpén areas, and anorogenic A‐Type granitoids in Cobquecura area. Also, partial melting of a metasomatized asthenospheric mantle plus continental crust that experienced previous high‐temperature hydrothermal alteration would have generated high‐silica magmas with low δ18O, high Pb, CHUR‐like 87Sr/86Sr, and 143Nd/144Nd ratios that originated La Estrella Granite. Our results offer an alternative explanation for the existence of subtle magmatic arc‐like geochemical signatures in the study area and support a segmentation of the active margin during the Late Triassic. The widespread upper‐plate magmatic record of slab‐tearing, spanning the Coastal Cordillera of Central Chile to the intraplate Neuquén basin in Argentina, and the lower mantle record of a slab gap, detected in ours and previous tomotectonic analyses, make the Late Triassic slab‐tearing event in southwestern Pangea the most robustly constrained pre‐Cenozoic slab tear process so far.

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Permian Large Igneous Provinces and Their Paleoenvironmental Effects

Chen

2021

Geophysical Monograph Series

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The Permian Period was characterized by a series of large-scale volcanic eruptions, including the emplacement of at least five mafic Large Igneous Provinces (LIPs: Skagerrak-Centered, Tarim, Panjal, Emeishan, and Siberian) and two silicic LIPs (Kennedy-Connors-Auburn and Choiyoi). Global climate change from a glacial (icehouse) state in the latest Carboniferous-Early Permian to nonglacial (greenhouse) state in the Late Permian and Permian-Triassic interval, and major biotic change such as the end-Guadalupian and end-Permian mass extinctions, also occurred in this interval. Whether these climate and biotic changes, along with other paleoenvironmental perturbations (e.g., carbon cycle, ocean chemistry, and terrestrial weathering), were triggered by or in certain ways associated with contemporaneous LIP volcanism need to be examined on a case-by-case basis. In this chapter, we summarize some recent advances in the studies of the Permian LIPs, contemporary paleoenvironmental conditions, and their potential associations with biodiversity changes, especially the end-Guadalupian and end-Permian mass extinctions. Our analyses suggest (1) high volume of volcanic products, (2) short duration, and (3) widespread sill intrusions that led to contact metamorphism with wall rocks (e.g., evaporates, organic-rich sediments, petroleum reservoir) are the pivotal factors determining the paleoenvironmental effects of LIP volcanism. The combination of these three characteristics enabled the Siberian Traps volcanism to be the most deadly, and potentially can affect the contemporaneous environment and biota on a global scale. Other mafic and silicic LIPs in the Permian, by contrast, either do not possess any of, or are only partly in accord with, these determining factors. Therefore, their impact on contemporaneous climate and ecosystem is limited.

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Tectonic evolution of the southwestern margin of Pangea and its global implications: Evidence from the mid Permian–Triassic magmatism along the Chilean-Argentine border

Cited by 26 publications

References 59 publications

The Gondwanan margin in West Antarctica: Insights from Late Triassic magmatism of the Antarctic Peninsula

The Gondwanan margin in West Antarctica: Insights from Late Triassic magmatism of the Antarctic Peninsula

Origin of Late Triassic Granitoids of the Coastal Cordillera of Southern Central Chile (34°–37°S): Multi‐Isotopic Evidence of Slab Tearing Effects on Pre‐Andean Magmagenesis

Permian Large Igneous Provinces and Their Paleoenvironmental Effects

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