Tectonic Controls on Global Variations of Large-Magnitude Explosive Eruptions in Volcanic Arcs

Sheldrake, Tom; Caricchi, Luca; Scutari, Marco

doi:10.3389/feart.2020.00127

Cited by 15 publications

(30 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The broad spatiotemporal coincidence of this deformation with high-volume magmatism led previous workers to propose direct links between the distribution of deformation and magmatism in time and space as well as direct links between the tectonomagmatic evolution of the CSN and paleotectonic boundary conditions. Many of these hypotheses have been incorporated as fundamental assumptions underpinning subsequent studies of magmatic systems across the world (e.g., Kokkalas and Aydin, 2013;Acocella, 2014;Sheldrake et al, 2020).…”

Section: ■ Introductionmentioning

confidence: 99%

Spatiotemporally heterogeneous deformation, indirect tectonomagmatic links, and lithospheric evolution during orogenic activity coeval with an arc flare-up

et al. 2022

View full text Add to dashboard Cite

Broad overlap between deformation and magmatism in active margins has spurred the development of a conceptual framework of direct tectonomagmatic links in both active and ancient arcs. Although widespread and highly influential, such models have only rarely been critically evaluated. Rigorously linking tectonism, geodynamics, lithospheric evolution, and arc activity requires detailed reconstructions of the spatiotemporal patterns of magmatism and deformation across both a sufficiently wide area and a range of observational scales. Herein, new constraints on the timing, extent, and characteristics of deformation during mid-Cretaceous tectonism in the central Sierra Nevada (eastern California, USA) are synthesized with published geologic mapping, structural studies, and geochronology to create an updated reconstruction of one of the type examples of a hot, magma-rich orogen. Tilted strata, tectonic fabrics, and shear zones with variable geometries, kinematics, intensity, and timing reveal a significantly revised record of ~25 m.y. of heterogeneous deformation ca. 105–80 Ma. Deformation and magmatism show distinct and unrelated spatiotemporal patterns throughout this orogenic episode. Contrary to previous models of direct tectonomagmatic links, many of which were developed in the central Sierra Nevada, arc activity did not control the location, intensity, or kinematics of intra-arc deformation, nor did shear zones control the location of magmatism. Furthermore, arc lithosphere appears to have strengthened, rather than weakened, as the arc-orogenic flare-up proceeded. In addition to changing plate-scale boundary conditions, lithospheric-scale rheological evolution likely played a key role in the patterns of Late Cretaceous deformation observed across strike of the entire Cordilleran margin.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Spatiotemporally heterogeneous deformation, indirect tectonomagmatic links, and lithospheric evolution during orogenic activity coeval with an arc flare-up

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The development of caldera systems results from the complex interplay of tectonic and crustal processes that influence the ability to accumulate large magma volumes 50 , 51 . The regional impact of these processes is observed in the Trans Mexican Volcanic Belt.…”

Section: Discussionmentioning

confidence: 99%

Geochemical variability as an indicator for large magnitude eruptions in volcanic arcs

Weber

Sheldrake

2022

Sci Rep

View full text Add to dashboard Cite

Caldera-forming eruptions have the potential to induce drastic socioeconomic change. However, the criteria to identify volcanoes capable of producing large magnitude eruptions in the future are not well constrained. Here we compile and analyse data, revealing that volcanoes which have produced catastrophic caldera-forming eruptions in the past, show larger ranges of erupted magma geochemistry compared to those that have not. This suggests geochemical variability is related to the size of magmatic systems. Using heat transfer simulations, we show that differences in magma flux result in a dependency between chemical diversity and magma volume that is consistent with these observations. We conclude that compositional spread should be included in the catalogue of criteria to identify volcanoes with greater probability of producing future large eruptions. Importantly, this allows to identify stratovolcanoes with caldera-like geochemical signatures, which have not yet been recognized as systems with greater likelihood of producing large magnitude eruptions.

show abstract

“…Although a significant part of the Paleogene magmatic record was lost by erosion or may be hidden in the crust below, older Jurassic, and Cretaceous arc plutons found in the Central Cordillera have field expressions that are volumetrically larger than the ones from the PECMA (Bustamante et al., 2016; Gómez et al., 2015), and maybe related to lower magmatic productivity between the Paleocene and the early Eocene. This apparent reduction of the magma volumes can be interpreted as evidence of oblique convergence (Sheldrake et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Diverse Magmatic Evolutionary Trends of the Northern Andes Unraveled by Paleocene to Early Eocene Detrital Zircon Geochemistry

Jaramillo

Zapata

Carvalho

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The Paleocene‐early Eocene continental magmatic arc (PECMA) in the Northern Andes is an example of arc magmatism following a major collisional event. This arc formed after the arc‐continent collision between the Caribbean Plate and the South American continental margin at ca. 72 Ma. We used detrital zircon LA‐ICP‐MS and CA‐ID‐TIMS geochronology and geochemistry to complement the limited plutonic record of the PECMA and better characterize the PECMA's magmatic evolution. Zircon geochronology and their respective trace element geochemistry were analyzed from Paleocene‐early Eocene strata of the Bogotá Formation in the foreland region. Our results show that after the collision of the Caribbean Plate, the magmas in the PECMA differentiated under a thick continental crust with limited subduction input at ca. 66 Ma. By 62–50 Ma, scattered patterns of Hf, U, U/Yb, and Yb/Gd ratios in detrital zircons suggest the existence of contrasting magmatic inputs attributed to different depths of crustal fractionation, varied temperatures of crystallization, and significant mantle and subduction inputs. These diverse magmatic patterns reflect the evolution of the continental crust. We proposed that oblique convergence and strike‐slip tectonics favored contrasting crustal architectures along the continental margin while local lithosphere dripping from a previously thickened crust promoted the formation of hot magmas under a thick continental crust.

show abstract

Tectonic Controls on Global Variations of Large-Magnitude Explosive Eruptions in Volcanic Arcs

Cited by 15 publications

References 67 publications

Spatiotemporally heterogeneous deformation, indirect tectonomagmatic links, and lithospheric evolution during orogenic activity coeval with an arc flare-up

Spatiotemporally heterogeneous deformation, indirect tectonomagmatic links, and lithospheric evolution during orogenic activity coeval with an arc flare-up

Geochemical variability as an indicator for large magnitude eruptions in volcanic arcs

Diverse Magmatic Evolutionary Trends of the Northern Andes Unraveled by Paleocene to Early Eocene Detrital Zircon Geochemistry

Contact Info

Product

Resources

About