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Impact of channelized flow on temperature distribution and fluid flow in restless calderas: Insight from Campi Flegrei caldera, Italy.

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Title: Impact of channelized flow on temperature distribution and fluid flow in restless calderas: Insight from Campi Flegrei caldera, Italy.
Authors: Jasim, Alia1 alia.jasim@bristol.ac.uk, Whitaker, Fiona F.1 fiona.whitaker@bristol.ac.uk, Rust, Alison C.1 alison.rust@bristol.ac.uk
Source: Journal of Volcanology & Geothermal Research. Sep2015, Vol. 303, p157-174. 18p.
Subjects: Temperature distribution, Calderas, Hydrothermal alteration, Volcanic craters
Geographic Terms: Italy
Abstract: Magmatic hydrothermal systems develop by the imposition of a magmatically derived heat flux upon a shallow groundwater system. As such their dynamics can be intermittently perturbed by changing conditions within the associated magmatic system. Understanding the nature of the coupling between the magmatic and groundwater systems is thus key to discriminating geophysical signals of magmatic unrest from purely hydrothermal ones. Using a series of numerical groundwater models run with TOUGH2, we simulate the coupled groundwater–magmatic system at Campi Flegrei caldera, with particular emphasis on the impact of permeability developed within local fault systems and the dynamics of the system during magmatic unrest. Simulation results suggest that faults can play an important role in controlling the dynamics of recharge and heat transport within the shallow hydrothermal reservoir. Results specifically highlight that contrasts in permeability between faults and surrounding rock impact local temperature gradients, with faults either acting as preferential routes for recharge or discharge of groundwater, depending on fault/caldera fill permeability contrast and the vertical extent of the fault. Simulations of magmatic unrest with a step-wise increase in basal heat flux suggest that periodic geophysical and chemical signals may stem from the interaction between the development of gas at depth and the recharge–discharge dynamics of the reservoir. These results highlight the potential for the dynamics of magmatic–hydrothermal systems to be significantly impacted by the presence and nature of local fault systems. Where dynamic groundwater systems are involved, it is thus important to understand the impact of such geological elements when interpreting monitoring data such as ground deformation, seismicity and gas emissions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Volcanology & Geothermal Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 109885066
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Impact of channelized flow on temperature distribution and fluid flow in restless calderas: Insight from Campi Flegrei caldera, Italy.
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  Data: <searchLink fieldCode="AR" term="%22Jasim%2C+Alia%22">Jasim, Alia</searchLink><relatesTo>1</relatesTo><i> alia.jasim@bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Whitaker%2C+Fiona+F%2E%22">Whitaker, Fiona F.</searchLink><relatesTo>1</relatesTo><i> fiona.whitaker@bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Rust%2C+Alison+C%2E%22">Rust, Alison C.</searchLink><relatesTo>1</relatesTo><i> alison.rust@bristol.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Volcanology+%26+Geothermal+Research%22">Journal of Volcanology & Geothermal Research</searchLink>. Sep2015, Vol. 303, p157-174. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Temperature+distribution%22">Temperature distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Calderas%22">Calderas</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrothermal+alteration%22">Hydrothermal alteration</searchLink><br /><searchLink fieldCode="DE" term="%22Volcanic+craters%22">Volcanic craters</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Italy%22">Italy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Magmatic hydrothermal systems develop by the imposition of a magmatically derived heat flux upon a shallow groundwater system. As such their dynamics can be intermittently perturbed by changing conditions within the associated magmatic system. Understanding the nature of the coupling between the magmatic and groundwater systems is thus key to discriminating geophysical signals of magmatic unrest from purely hydrothermal ones. Using a series of numerical groundwater models run with TOUGH2, we simulate the coupled groundwater–magmatic system at Campi Flegrei caldera, with particular emphasis on the impact of permeability developed within local fault systems and the dynamics of the system during magmatic unrest. Simulation results suggest that faults can play an important role in controlling the dynamics of recharge and heat transport within the shallow hydrothermal reservoir. Results specifically highlight that contrasts in permeability between faults and surrounding rock impact local temperature gradients, with faults either acting as preferential routes for recharge or discharge of groundwater, depending on fault/caldera fill permeability contrast and the vertical extent of the fault. Simulations of magmatic unrest with a step-wise increase in basal heat flux suggest that periodic geophysical and chemical signals may stem from the interaction between the development of gas at depth and the recharge–discharge dynamics of the reservoir. These results highlight the potential for the dynamics of magmatic–hydrothermal systems to be significantly impacted by the presence and nature of local fault systems. Where dynamic groundwater systems are involved, it is thus important to understand the impact of such geological elements when interpreting monitoring data such as ground deformation, seismicity and gas emissions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Volcanology & Geothermal Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.jvolgeores.2015.07.029
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 157
    Subjects:
      – SubjectFull: Temperature distribution
        Type: general
      – SubjectFull: Calderas
        Type: general
      – SubjectFull: Hydrothermal alteration
        Type: general
      – SubjectFull: Volcanic craters
        Type: general
      – SubjectFull: Italy
        Type: general
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      – TitleFull: Impact of channelized flow on temperature distribution and fluid flow in restless calderas: Insight from Campi Flegrei caldera, Italy.
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            NameFull: Jasim, Alia
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            NameFull: Whitaker, Fiona F.
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            NameFull: Rust, Alison C.
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            – D: 15
              M: 09
              Text: Sep2015
              Type: published
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