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Time Constraints on Magma Intrusionfrom Thermal Models of Long-Termsubsidence: Medicine Lake Volcano, CA

  • Amy Laura ParkerEmail author
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Part of the Springer Theses book series (Springer Theses)

Abstract

Magma intrusion plays a fundamental role in the eruptive cycle. The geodetic response to intrusion is thought to persist over years - decades as magma cools and crystallises, reducing in volume. However, past thermal modelling approaches do not explain ground deformation over these time-scales. Here we combine an existing thermal model with simple geodetic and petrological constraints to show that subsidence resulting from cooling and crystallising magma intrusions (volume < 3 km\(^3\)) may persist over decadal time-scales. We find that the rate and time-scale of subsidence is dependent upon the magma composition, the intrusion geometry, and the thermal state of the surrounding country rock. The early stages of volume change are most dependent upon cooling and crystallisation at the intrusion contact, which is a function of surface area and country rock temperature. Changes in the rate of volume change over time are slower for sills of lower aspect ratio (thicker) and correspond to changes in the crystallising assemblage. We apply this modelling approach to long-term, steady subsidence of Medicine Lake Volcano, CA, using realistic petrological and geometrical inputs. Comparing the results to the geodetic record, we identify a suite of best-fitting models with initial volumes of 1–2.5 km\(^3\) that reproduce >65 years of subsidence measured at the volcano. These results suggest that magma intrusion has occurred on the order of hundreds of years before present, more recently than the time of the last eruption \(\sim \)1 ka, and that subsidence may continue for decades. Long-term subsidence is observed at numerous volcanic centres and, through this modelling approach, can be used to provide insight into crustal magma fluxes and the timing of magma intrusion.

Keywords

Country Rock Geothermal Gradient Ground Deformation Magma Body Magma Intrusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Authors and Affiliations

  1. 1.Department of Spatial SciencesCurtin UniversityPerthAustralia

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