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io: loki patera as a magma seaWe develop a physical model for Loki Patera as a magma sea. We calculate the total volume of magma moving through the Loki Patera volcanic system every resurfacing cycle (approx.540 days) and the resulting variation in thermal emission. The rate of magma solidification at times reaches 3 x 10(exp 6) kg per second, with a total solidified volume averaging 100 cu km per year. A simulation of gas physical chemistry evolution yields the crust porosity profile and the timescale when it will become dense enough to founder in a manner consistent with observations. The Loki Patera surface temperature distribution shows that different areas are at different life cycle stages. On a regional scale, however, there can be coordinated activity, indicated by the wave of thermal change which progresses from Loki Patera's SW quadrant toward the NE at a rate of approx.1 km per day. Using the observed surface temperature distribution, we test several mechanisms for resurfacing Loki Patera, finding that resurfacing with lava flows is not realistic. Only the crustal foundering process is consistent with observations. These tests also discovered that sinking crust has a 'heat deficit' which promotes the solidification of additional magma onto the sinking plate ("bulking up"). In the limiting case, the mass of sinking material can increase to a mass of approx.3 times that of the foundering plate. With all this solid matter sinking, there is a compensating upward motion in the liquid magma. This can be in excess of 2 m per year. In this manner, solid-liquid convection is occurring in the sea.
Document ID
20070032965
Document Type
Reprint (Version printed in journal)
Authors
Matson, Dennis L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Davies, Ashley Gerard
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Veeder, Glenn J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Rathbun, Julie A.
(Redlands Univ. CA, United States)
Johnson, Torrence V.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Castillo, Julie C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 23, 2013
Publication Date
September 2, 2006
Publication Information
Publication: Journal Of Geophysical Research
Volume: 111
ISSN: 0148-0227
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Other
Keywords
heat flow
Io
volcanic system
basalt
Loki Patera