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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 388, 2019 DOI: 10.1016/j.volgeores.2019.106691

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Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks

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Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks. / Saubin, Elodie; Kennedy, Ben M. ; Tuffen, Hugh et al.
In: Journal of Volcanology and Geothermal Research, Vol. 388, 106691, 15.12.2019.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Saubin, E, Kennedy, BM, Tuffen, H, Villeneuve, M, Davidson, J & Burchardt, S 2019, 'Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks', Journal of Volcanology and Geothermal Research, vol. 388, 106691. https://doi.org/10.1016/j.jvolgeores.2019.106691

APA

Saubin, E., Kennedy, B. M., Tuffen, H., Villeneuve, M., Davidson, J., & Burchardt, S. (2019). Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks. Journal of Volcanology and Geothermal Research, 388, Article 106691. https://doi.org/10.1016/j.jvolgeores.2019.106691

Vancouver

Saubin E, Kennedy BM, Tuffen H, Villeneuve M, Davidson J, Burchardt S. Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks. Journal of Volcanology and Geothermal Research. 2019 Dec 15;388:106691. Epub 2019 Oct 28. doi: 10.1016/j.jvolgeores.2019.106691

Author

Saubin, Elodie ; Kennedy, Ben M. ; Tuffen, Hugh et al. / Comparative field study of shallow rhyolite intrusions in Iceland : emplacement mechanisms and impact on country rocks. In: Journal of Volcanology and Geothermal Research. 2019 ; Vol. 388.

Bibtex

@article{25f6fef4144a4599ab85fb70822c3e24,
title = "Comparative field study of shallow rhyolite intrusions in Iceland: emplacement mechanisms and impact on country rocks",
abstract = "Shallow silicic intrusions are known to exist in many active volcanoes and can fuel both eruptions and hydrothermal fields. However, our knowledge of magma intrusions remains far from complete, and processes occurring at intrusion margins are poorly understood. In this field-based study, we characterise four shallows, dissected rhyolitic intrusions at three sites in Iceland (Njar{\dh}v{\'i}k-Dyrfj{\"o}ll, Krafla and H{\'u}safell central volcanoes). We focus on the relationship between intrusion emplacement mechanisms and country rock response, employing scanline mapping of fractures and in-situ rock property measurements (hardness and permeability) along transects from the intrusion margins to damaged and undamaged country rocks.We identify various scenarios of shallow intrusion emplacement style, based upon their diverse geometry and lithofacies architecture. Additional information from rock properties and characteristics of fractures and vesicles, indicates that initial country rock properties strongly influence the emplacement style. We identify two discrete types of country rock response to magma injection. The matrix permeability of weak, porous and permeable lithologies (conglomerate and hyaloclastite) is reduced by >1 order of magnitude adjacent to intrusions due to pore occlusion. Stronger and denser, low-permeability lithologies (basalt and welded ignimbrite) undergo a decrease in hardness by a factor >2 related to an up to fivefold increase in fracture density, with no significant change in matrix permeability.Our observations highlight the importance of robust characterisation of the mechanical properties of caldera-filling or geothermal reservoir formations, for appropriate forecasting of magma mobility, geophysical data interpretation, and geothermal resources characterisation.",
keywords = "Rhyolite, Intrusion, Iceland, Damage, Emplacement, Permeability",
author = "Elodie Saubin and Kennedy, {Ben M.} and Hugh Tuffen and Marlene Villeneuve and Jonathan Davidson and Steffi Burchardt",
note = "This is the author{\textquoteright}s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 388, 2019 DOI: 10.1016/j.volgeores.2019.106691",
year = "2019",
month = dec,
day = "15",
doi = "10.1016/j.jvolgeores.2019.106691",
language = "English",
volume = "388",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier Science B.V.",

}

RIS

TY - JOUR

T1 - Comparative field study of shallow rhyolite intrusions in Iceland

T2 - emplacement mechanisms and impact on country rocks

AU - Saubin, Elodie

AU - Kennedy, Ben M.

AU - Tuffen, Hugh

AU - Villeneuve, Marlene

AU - Davidson, Jonathan

AU - Burchardt, Steffi

N1 - This is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 388, 2019 DOI: 10.1016/j.volgeores.2019.106691

PY - 2019/12/15

Y1 - 2019/12/15

N2 - Shallow silicic intrusions are known to exist in many active volcanoes and can fuel both eruptions and hydrothermal fields. However, our knowledge of magma intrusions remains far from complete, and processes occurring at intrusion margins are poorly understood. In this field-based study, we characterise four shallows, dissected rhyolitic intrusions at three sites in Iceland (Njarðvík-Dyrfjöll, Krafla and Húsafell central volcanoes). We focus on the relationship between intrusion emplacement mechanisms and country rock response, employing scanline mapping of fractures and in-situ rock property measurements (hardness and permeability) along transects from the intrusion margins to damaged and undamaged country rocks.We identify various scenarios of shallow intrusion emplacement style, based upon their diverse geometry and lithofacies architecture. Additional information from rock properties and characteristics of fractures and vesicles, indicates that initial country rock properties strongly influence the emplacement style. We identify two discrete types of country rock response to magma injection. The matrix permeability of weak, porous and permeable lithologies (conglomerate and hyaloclastite) is reduced by >1 order of magnitude adjacent to intrusions due to pore occlusion. Stronger and denser, low-permeability lithologies (basalt and welded ignimbrite) undergo a decrease in hardness by a factor >2 related to an up to fivefold increase in fracture density, with no significant change in matrix permeability.Our observations highlight the importance of robust characterisation of the mechanical properties of caldera-filling or geothermal reservoir formations, for appropriate forecasting of magma mobility, geophysical data interpretation, and geothermal resources characterisation.

AB - Shallow silicic intrusions are known to exist in many active volcanoes and can fuel both eruptions and hydrothermal fields. However, our knowledge of magma intrusions remains far from complete, and processes occurring at intrusion margins are poorly understood. In this field-based study, we characterise four shallows, dissected rhyolitic intrusions at three sites in Iceland (Njarðvík-Dyrfjöll, Krafla and Húsafell central volcanoes). We focus on the relationship between intrusion emplacement mechanisms and country rock response, employing scanline mapping of fractures and in-situ rock property measurements (hardness and permeability) along transects from the intrusion margins to damaged and undamaged country rocks.We identify various scenarios of shallow intrusion emplacement style, based upon their diverse geometry and lithofacies architecture. Additional information from rock properties and characteristics of fractures and vesicles, indicates that initial country rock properties strongly influence the emplacement style. We identify two discrete types of country rock response to magma injection. The matrix permeability of weak, porous and permeable lithologies (conglomerate and hyaloclastite) is reduced by >1 order of magnitude adjacent to intrusions due to pore occlusion. Stronger and denser, low-permeability lithologies (basalt and welded ignimbrite) undergo a decrease in hardness by a factor >2 related to an up to fivefold increase in fracture density, with no significant change in matrix permeability.Our observations highlight the importance of robust characterisation of the mechanical properties of caldera-filling or geothermal reservoir formations, for appropriate forecasting of magma mobility, geophysical data interpretation, and geothermal resources characterisation.

KW - Rhyolite

KW - Intrusion

KW - Iceland

KW - Damage

KW - Emplacement

KW - Permeability

U2 - 10.1016/j.jvolgeores.2019.106691

DO - 10.1016/j.jvolgeores.2019.106691

M3 - Journal article

VL - 388

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

M1 - 106691

ER -