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Mark S. Ghiorso
University of Washington
160Publications
48H-index
10.7kCitations
Publications 160
Newest
#1Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
#2Darren M. Gravley (Cant.: University of Canterbury)H-Index: 16
Last.Mark S. GhiorsoH-Index: 48
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Abstract The deposits of large volcanic eruptions provide the sole record of the architecture of magmatic plumbing systems in the moments when large pools of crystal-poor, eruptible magma are present in the crust. It is widely accepted that silicic magmas form by segregation of melt-rich, crystal-poor magma from a crystal-rich source; however, the depths at which segregation takes place and the distribution of the magma within the crust are not well constrained. We present a new approach to calc...
1 CitationsSource
#1Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
#2Florence Bégué (UNIL: University of Lausanne)H-Index: 6
Last.Mark S. GhiorsoH-Index: 48
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2 CitationsSource
#1Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
#2Darren M. Gravley (Cant.: University of Canterbury)H-Index: 16
Last.Chad D. Deering (MTU: Michigan Technological University)H-Index: 18
view all 8 authors...
Very large eruptions (>50 km 3 ) and supereruptions (>450 km 3 ) reveal Earth’s capacity to produce and store enormous quantities (>1000 km 3 ) of crystal-poor, eruptible magma in the shallow crust. We explore the interplay between crustal evolution and volcanism during a volcanic flare-up in the Taupo Volcanic Zone (TVZ, New Zealand) using a combination of quartz-feldspar-melt equilibration pressures and time scales of quartz crystallization. Over the course of the flare-up, crystallization dep...
4 CitationsSource
#1Lydia J. Harmon (Vandy: Vanderbilt University)H-Index: 1
#2James Cowlyn (Cant.: University of Canterbury)H-Index: 1
Last.Mark S. GhiorsoH-Index: 48
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A new phase equilibria geobarometer determines magmatic storage and crystallization conditions, including pressure, temperature, oxygen fugacity (\({f_{{{\text{o}}_2}}}\)), and the presence of a fluid phase for glass-bearing rocks containing the assemblage plagioclase + pyroxene(s). This newly developed geobarometer can better constrain crystallization conditions of shallow (< 500 MPa; <~ 20 km), glass-bearing andesites to dacites. The geobarometer utilizes rhyolite-MELTS to determine crystalliz...
3 CitationsSource
1 CitationsSource
#1Samantha Tramontano (Vandy: Vanderbilt University)H-Index: 1
#2Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
Last.Mark S. GhiorsoH-Index: 48
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Abstract Understanding silicic eruption triggers is paramount for deciphering explosive volcanism and its potential societal hazards. Here, we use phase equilibria modeling to determine the potential role of internal triggering – wherein magmas naturally evolve to a state in which eruption is inevitable – in rhyolitic magma bodies. Whole-rock compositions from five large to super-sized rhyolitic deposits are modeled using rhyolite-MELTS. By running simulations with varying water contents, we can...
9 CitationsSource
#1Laura Créon (French Institute of Petroleum)H-Index: 2
#2Virgile Rouchon (French Institute of Petroleum)H-Index: 9
Last.François Guyot (University of Paris)H-Index: 53
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Subduction of carbonated crust is widely believed to generate a flux of carbon into the base of the continental lithospheric mantle, which in turn is the likely source of widespread volcanic and non-volcanic CO_2 degassing in active tectonic intracontinental settings such as rifts, continental margin arcs and back-arc domains. However, the magnitude of the carbon flux through the lithosphere and the budget of stored carbon held within the lithospheric reservoir are both poorly known. We provide ...
9 CitationsSource
#1Ayla S. Pamukcu (Princeton University)H-Index: 8
#2Mark S. GhiorsoH-Index: 48
Last.Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
view all 3 authors...
3 CitationsSource
#1Ayla S. Pamukcu (Princeton University)H-Index: 8
#2Mark S. GhiorsoH-Index: 48
Last.Guilherme A. R. Gualda (Vandy: Vanderbilt University)H-Index: 22
view all 3 authors...
Volcanic quartz commonly contains Ti-enriched zones and CO2-enriched melt inclusions, and crystallization temperatures and pressures derived from Ti-in-quartz geothermobarometry and H2O–CO2 glass geobarometry applied to these compositions are typically high. Consequently, these features are generally interpreted to represent high temperatures and/or pressures. Yet, growth rate estimates from some high-Ti/bright-CL quartz rims suggest they grew at rates orders of magnitude faster than did cores a...
8 CitationsSource
#1Ryan T. Neilson (UCSB: University of California, Santa Barbara)
#2Frank J. Spera (UCSB: University of California, Santa Barbara)H-Index: 39
Last.Mark S. GhiorsoH-Index: 48
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Understanding the thermodynamics of liquid silicates at high pressure and temperature is essential for many petrologic problems, and sodium aluminosilicates are an important component of most magmatic systems. We provide a high-pressure equation of state (EOS) for liquid NaAlSi3O8 based upon molecular dynamics (MD) simulations. The resulting thermodynamic properties have changes in pressure and temperature correlative to trends in diffusion and atomic structure, giving insight to the connections...
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