Geochronological evolution of the potentially active Iliniza Volcano (Ecuador) based on new K-Ar ages

Santamaria, Santiago; Quidelleur, Xavier; Hidalgo, Silvana; Samaniego, Pablo; Pennec, Jean–Luc Le; Liorzou, Céline; Lahitte, Pierre; Córdova, Marco; Espín, Pedro

doi:10.1016/j.jvolgeores.2022.107489

Cited by 7 publications

(21 citation statements)

References 92 publications

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“…However, most of the Pleistocene andesitic volcanic centres developed during the last 0.5–0.6 Ma: later eruptive stages of Cayambe started from 0.4 Ma, of Rucu Pichincha from 0.45 Ma; Illiniza‐Santa Cruz from 0.7 Ma (Santamaría et al, 2022), Cotopaxi from c . 0.5 Ma (Hall & Mothes, 2008), Antisana at 0.4 Ma (Hall et al, 2017), Quilindaña and Chalupas at 0.2 Ma (Bablon et al, 2020b), Cotacachi at 0.2 Ma (Bablon et al, 2020b), Carihuairazo successively at 0.5 and 0.2 Ma (Bablon et al, 2019), and Chimborazo at 0.1–0.15 Ma (Samaniego et al, 2012) [see Figure 2b for a graphical summary].…”

Section: Discussionmentioning

confidence: 99%

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How tectonic, volcanic and climatic processes in Andean ‘sky islands’ shaped the diversification of endemic ground beetles

Murienne

Barragán

Manzi

et al. 2022

Journal of Biogeography

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Aim The Andean superpáramo ecosystem, above c. 4200 m a.s.l., currently forms an archipelago of isolated ‘sky islands’ which provides a unique setting to study biogeography. However, there is still a poor understanding of how past geological events, together with past climatic changes, have shaped the distribution of life in this ecosystem. Our aim was to investigate the importance of biogeographical barriers in local diversifications and to analyse how populations have become isolated on current ‘sky islands’. Location Neotropics, Andes, Páramo, Ecuador. Taxon Coleoptera, Carabidae, Platynini, Dyscolus. Methods We first used distributional data of 45 superpáramo specialist species to define areas of endemism in northern Ecuador. We then selected 34 currently isolated populations of 12 species to perform a high‐throughput genome skimming approach encompassing the complete mitogenome and the complete nuclear ribosomal cluster. We also generated a time‐calibrated estimation for the diversification of the group, and compared it to geochronological data. Results A high proportion (60%) of the sampled species are microendemic, being restricted to a single mountain summit. Three mutually exclusive areas of endemism are limited by deep transverse valleys across the Andes, and Pliocene speciation events are related to these orogenic barriers. The phylogeny obtained from the genome‐skimming approach provides a robust base to analyse the diversification of superpáramo endemic species and populations throughout the Plio‐Pleistocene. Main conclusions The opening of the Interandean Valley did not play a significant role in the diversification of the group prior to the Pleistocene. More recently, multiple populations have become isolated on the superpáramo of various volcanoes by independently colonizing this habitat during repeated cycles of glacial–interglacial periods. Our results highlight the joint contribution of orogeny and climatic fluctuations for explaining the current patterns of distribution. Each species had a different colonization history, with its populations reaching the different volcanoes at different glacial–interglacial cycles. Our approach also can provide a powerful tool to constrain the geological processes responsible for the topographic changes along and across the Cordillera.

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Section: Discussionmentioning

confidence: 99%

“…Illiniza-Santa Cruz from 0.7 Ma (Santamaría et al, 2022), Cotopaxi from c. 0.5 Ma (Hall & Mothes, 2008), Antisana at 0.4 Ma (Hall et al, 2017), Quilindaña and Chalupas at 0.2 Ma (Bablon et al, 2020b),…”

Section: Phylogeny and Divergence Time Estimationmentioning

confidence: 99%

How tectonic, volcanic and climatic processes in Andean ‘sky islands’ shaped the diversification of endemic ground beetles

Murienne

Barragán

Manzi

et al. 2022

Journal of Biogeography

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“…For some volcanoes, such as Tungurahua, Antisana, and the Pichincha complex, magmas became more silicic with time, but no clear changes can be linked to glacial cycles (Robin et al, 2010;Hall et al, 2017;Bablon et al, 2020). At Iliniza, the reverse is observed where magmas became less silicic and more magnesian with time, but changes are also not discussed in relation to changing ice coverage (Santamaría et al, 2022). In other cases, correlations between eruptive rate and compositions occur but they are not causally connected with time-varied ice coverage.…”

Section: Time-composition Trends For Arc Volcanoes Affected By Pleist...mentioning

confidence: 98%

“…Elevated edifice growth rates after ~15 ka, relative to the apparent hiatus between 190 ± 23 ka and ~15 ka, appear to show increased eruptive rates following deglaciation, but a similar pattern is not seen after the MIS 6 deglaciation (ending at ~130 ka). At Iliniza, the northern edifice was constructed at a rate of 3.5 ± 2.6 km 3 /kyr over the period of ~124-116 ka following the MIS 6 glacial termination (Santamaría et al, 2022). After a ~70 kyr-long apparent lacuna during MIS 5 and 4, construction of the South Iliniza edifice recommenced at ~46 ka and continued until ~25 ka (MIS 3-2), with no post-25 lava flows.…”

Section: Ecuadorian Andesmentioning

confidence: 99%

“…A number of studies have examined potential volcanic responses to deglaciation over multiple glacial-interglacial cycles (e.g., Singer et al, 1997;Edwards et al, 2002;Hildreth et al, 2003b;Lanphere and Sisson, 2003;Bacon and Lanphere, 2006;Jicha and Singer, 2006;Singer et al, 2008;Schmidt and Grunder, 2009;Jicha et al, 2012;Calvert et al, 2014;Conway et al, 2016;Calvert, 2019;Coombs and Jicha, 2020;Pure et al, 2020;Santamaría et al, 2022) whereas other studies only considered or have data for edifice growth rates during and after the last glacial period (e.g., Fiertsein et al, 2011;Calvert et al, 2018). Of the studies that solely consider the MIS 3-1 interval, some show maximum edifice growth rates during the glacial period when ice coverage was greatest (e.g., Middle Sister: Calvert et al, 2018) whereas others show maximum apparent eruptive rates after the LGM (e.g., Calbuco, Chile: Mixon et al, 2021), as in Figure 3.…”

Section: Volcanomentioning

confidence: 99%

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An assessment of potential causal links between deglaciation and eruption rates at arc volcanoes

Conway

Pure²,

Ishizuka

2023

Front. Earth Sci.

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One of the fundamental questions that underpins studies of the interactions between the cryosphere and volcanism is: do causal relationships exist between the ice volume on a volcano and its eruption rate? In particular, it is critical to determine whether the decompression of crustal magma systems via deglaciation has resulted in enhanced eruption rates along volcanic arcs in the middle to high latitudes. Evidence for such a feedback mechanism would indicate that ongoing glacier retreat could lead to future increases in eruptive activity. Archives of eruption frequency, size, and style, which can be used to test whether magma generation and eruption dynamics have been affected by local ice volume fluctuations, exist in the preserved eruptive products of Pleistocene-Holocene volcanoes. For this contribution, we have reviewed time-volume-composition trends for 33 volcanoes and volcanic groups in arc settings affected by glaciation, based on published radiometric ages and erupted volumes and/or compositions of edifice-forming products. Of the 33 volcanic systems examined that have geochronological and volumetric data of sufficient resolution to compare to climatic changes since ∼250 ka, increases in apparent eruption rates during post-glacial periods were identified for 4, with unclear trends identified for a further 12. Limitations in the geochronological and eruption volume datasets of the case studies make it difficult to test whether apparent eruption rates are correlated with ice coverage. Major caveats are: 1) the potential for biased preservation and exposure of eruptive materials within certain periods of a volcano’s lifespan; 2) the relative imprecision of geochronological constraints for volcanic products when compared with high-resolution climate proxy records; 3) the reliance on data only from immediately before and after the Last Glacial Termination (∼18 ka), which are rarely compared with trends throughout the Pleistocene to test the reproducibility of eruptive patterns; and 4) the lack of consideration that eruption rates and magma compositions may be influenced by mantle and crustal processes that operate independently of glacial advance/retreat. Addressing these limitations will lead to improvements in the fields of geochronology, paleoclimatology, and eruption forecasting, which could make valuable contributions to the endeavours of mitigating future climate change and volcanic hazards.

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The eruptive chronology of the Carihuairazo volcano (Ecuador): Recurrent sector collapses of a Middle Pleistocene stratovolcano of the northern andes

Samaniego

Ordóñez

Bablon

et al. 2022

Journal of South American Earth Sciences

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Geochronological evolution of the potentially active Iliniza Volcano (Ecuador) based on new K-Ar ages

Cited by 7 publications

References 92 publications

How tectonic, volcanic and climatic processes in Andean ‘sky islands’ shaped the diversification of endemic ground beetles

How tectonic, volcanic and climatic processes in Andean ‘sky islands’ shaped the diversification of endemic ground beetles

An assessment of potential causal links between deglaciation and eruption rates at arc volcanoes

The eruptive chronology of the Carihuairazo volcano (Ecuador): Recurrent sector collapses of a Middle Pleistocene stratovolcano of the northern andes

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