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Experimental, Observational, And Theoretical Needs

## Needed Items Doable, but with some effort Difficult but being pursued Difficult if not impossible

1 Elastic properties of magma Dingwell    
2 Magma rheology - crystal-rich magmas Dingwell, Rutherford, Manga    
3 Magma tensile strength Dingwell    
4 Permeability (hi T, P) Dingwell, bubble people    
5 Turbulent multi-phase flow particle interactions     Problem for chemical engineers
6 Quantifying nucleation (bubbles, crystals)   Navon, Mangan, Gardner, Larsen, Hammer  
7 More surface tension Dingwell, nucleation people    
8 a) Volume and b) Enthalpy of volatile-rich magma a) Lange and Dingwell b) Dingwell?  
9 More chemical diffusivity Zhang, Rutherford, Watson    
10 More thermal diffusivity Dingwell    
11 Mechanics of fragmentation (fractography) Dingwell, Zhang    
12 Advective bubble growth   Zhang  
13 Turbulent bubble growth    

1 Mass flux at vent      
2 Total mass erupted      
3 Exit velocity      
4 Plumbing geometry Melt inclusions give volatile content Phase equilibria  
5 Pre-eruptive volatile concentration      
6 Grain size distribution at vent and plume      
7 Gas composition and flux      
8 Plume composition and evolution      

1 Thermodynamic model      
2 Magma-edifice interaction      
3 Multi-scale coupling across domains      


Field Observations- What we can do:

Magma Chambers:
-Melt inclusions-volatile contents -> magma chamber pressure (depth) estimates
-Phase Equilibria-> P and T information on magma chambers. Late stage processes (compare with petrologic information).
-Fe-Ti oxide thermometry -> T and FO2 information on magmas. Other thermometers/geobarmoeters.
-Estimate total volume erupted. This will give minimum estimate on size/volume of magma storage region/chamber
-Petrology->magma mixing, composition of magmas, eruption triggers
-Geophysics (InSAR, GPS, others...) give estimates on volume changes, chamber locations, magma movement and ascent timescales.
-Exsolved/released volatiles form satellite data and other methods?

-Ascent rates (dome forming eruptions, slow eruption rates) through mineral and microlite textures (reaction rims etc).
-Lithic fragments ->Conduit wall erosion/collapse/geometry.
-Inferences on conduit geometry from seismicity and patterns. Migration of magma?
-Textural evidence of shear on conduit margins. Ripped up clasts of obsidian, sheared bubbles, mineral information
-Old eroded necks, plugs, dikes, etc. Direct field observations.
-Mass flux measurements (combined with petrologic data) Gives estimates on conduit geometry, size/shape parameters, doppler radar on velocities, particle concentrations

Long Term goals (what we are aiming for):

-Collecting post fragmentation data and inferring conditions at fragmentation.
-Vesicle data from pumice clasts (size distributions, number densities, etc). Stripping away the post fragmentation effects to say something about fragmentation conditions.
-Grain size distributions in eruption deposits extrapolated back to size distribution at fragmentation.


Send mail to alex.proussevitch@unh.edu with questions or comments about this web site.
Last modified: Tuesday May 08, 2007