Magmatic-tectonic control on the generation of silicic magmas in Iceland: Constraints from Hafnarfjall-Skarðsheiði volcano

Banik, Tenley J.; Miller, Calvin F.; Fisher, Colleen; Coble, Matthew A.; Vervoort, Jeffrey D.

doi:10.1016/j.lithos.2018.08.022

Cited by 13 publications

(22 citation statements)

References 92 publications

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“…Theories for the formation of silicic magmas typically focus on (i) partial melting of crustal material and (ii) fractional crystallization of magma, with the volcano's location relative to active rifting impacting on final compositions (e.g. Sigmarsson et al , ; Martin and Sigmarsson, , ; Sverrisdottir, ; Bindeman et al , ; Banik et al , ). These differing processes result in individual systems showing specific geochemical signatures that can be used to assign provenance to their eruptive products.…”

Section: Introductionmentioning

confidence: 99%

A catalogue of major and trace element data for Icelandic Holocene silicic tephra layers

Meara

Thordarson²,

Pearce

et al. 2019

J Quaternary Science

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Tephra layers with Icelandic provenance have been identified across the North Atlantic region in terrestrial, lacustrine, marine and glacial environments. These tephra layers are used as marker horizons in tephrochronology including climate studies, archaeology and environmental change. The major element chemistries of 19 proximally deposited Holocene Icelandic silicic tephra layers confirm that individual volcanic systems have unique geochemical signatures and that eruptions from the same system can often be distinguished. In addition, glass trace element chemistry highlights subtle geochemical variations between tephra layers which appear to have identical major element chemistry and thus allows for the identification of some, if not all, tephra layers previously considered identical in composition. This paper catalogues the compositional variation between the widespread Holocene Icelandic silicic tephra deposits.

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Section: Introductionmentioning

confidence: 99%

A catalogue of major and trace element data for Icelandic Holocene silicic tephra layers

Meara

Thordarson²,

Pearce

et al. 2019

J Quaternary Science

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“…Snaefell zircon ε Hf is higher than in basalts from other modern off-rift zones, including Öraefajökull (ε Hf ∼+11 to +12) and overlaps the range (ε Hf ∼+13.5 to +19) of values from basalts erupted from modern established rifts (Peate et al, 2010; data re-reduced using the CHUR value of Bouvier et al, 2008 to be internally consistent with this study). Measured zircon Hf compositions in samples IESn1, IESn2, and IESn3 vary by ∼2-2.5 epsilon units (Table 2; Figure 3c), which is typical for Icelandic systems (Banik et al, 2018;Carley et al, 2020;Padilla et al, 2016).…”

Section: Hafnium Isotopes In Zircon-a Case For Deep-crust Involvement?mentioning

confidence: 88%

“…Scenario 3 is also highly plausible and has been demonstrated at other volcanic systems, both active and extinct (e.g. Banik et al, 2018;Macdonald et al, 1987;Nicholson et al, 1991). Scenario 4 is improbablewhile some zircon ages predate edifice-building eruptions at Snaefell, they are generally synchronous with the Snaefell and occur within a geologically reasonable timeframe for zircon crystallization predating eruption (e.g., >100 kyr, Reid et al, 1997;∼300 kyr, Claiborne et al, 2010).…”

Section: An Updated Petrogenetic Model For Snaefell Rhyolitesmentioning

confidence: 94%

“…Snaefell zircon is enriched in heavy rare earth elements (HREE) relative to light rare earth elements (LREE) and displays positive Ce and negative Eu anomalies characteristic of magmatic zircon ( Figure 5) when normalized to chondrite (McDonough & Sun, 1995). Zircon from sample IESn3 is more enriched in overall REE than zircon from the other samples; however, all Snaefell zircon analyses have the same general REE trend characteristic of Icelandic zircon from silicic magmas (Banik et al, 2018;Carley et al, 2014). There is no observable distinction in trace element trends between older grain cores and younger grain mantles.…”

Section: Zircon Trace Element Concentrationsmentioning

confidence: 99%

“…Data used for Iceland zircon comparisons are available in Carley et al (2014), Banik et al (2018), and Carley et al (2020). Original data from this research is archived at EarthChem (https://doi.org/10.26022/ IEDA/111737).…”

Section: Data Availability Statementmentioning

confidence: 99%

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Magmatic Processes at Snæfell Volcano, Iceland, Constrained by Zircon Ages, Isotopes, and Trace Elements

Banik

Carley

Coble

et al. 2021

Geochem Geophys Geosyst

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U–Pb zircon age and chronology of the Torfufell central volcano: implications for timing of rift relocation in North Iceland

Árnadóttir,

Thordarson,

Hjartarson

et al. 2023

Bull Volcanol

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The Late-Miocene Torfufell central volcano (ToCV), situated between the now extinct Snæfellsnes-Húnaflói rift zone and the presently active rift in North Iceland, provides an excellent opportunity to recreate the construction history of a volcanic edifice. We present new U–Pb zircon ages from six silicic units of the ToCV. The results range from 7.15 ± 0.12 to 6.76 ± 0.02 Ma, taken here to represent a ~ 400 kyr time-span for silicic activity at the volcano. Before that, the central volcano had produced basaltic lavas for 600–800 kyr, implying that it was active for ~ 1–1.2 Myr. A stratigraphically documented ~ 1 Myr hiatus above the volcano is contemporaneous with, but shorter than, a major unconformity in the Flateyjarskagi peninsula, considered to result from a major rift relocation in North Iceland. The new U–Pb ages show that silicic volcanism at the ToCV took place 1–2 Myr earlier than assumed previously and nearly synchronously with the rift relocation. As the age progression of the ToCV and the neighboring 5–6 Ma Tinná central volcano conflicts with the generally established geotectonic framework of central N-Iceland, we propose that these two volcanoes were formed at a leaky transform zone that developed to accommodate the rift relocation, with the ToCV formed at its junction with the embryonic rift zone, thus marking the initiation of the presently active rift in North Iceland. Since then, the two volcanoes have drifted away from the rift system due to plate spreading and migration of the plate boundary relative to the Iceland mantle plume.

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Magmatic-tectonic control on the generation of silicic magmas in Iceland: Constraints from Hafnarfjall-Skarðsheiði volcano

Cited by 13 publications

References 92 publications

A catalogue of major and trace element data for Icelandic Holocene silicic tephra layers

A catalogue of major and trace element data for Icelandic Holocene silicic tephra layers

Magmatic Processes at Snæfell Volcano, Iceland, Constrained by Zircon Ages, Isotopes, and Trace Elements

U–Pb zircon age and chronology of the Torfufell central volcano: implications for timing of rift relocation in North Iceland

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