A Mesoproterozoic Continental Flood Rhyolite Province: The end Member Example of the Large Igneous Province Clan

Details A Mesoproterozoic Continental Flood Rhyolite Province: The end Member Example of the Large Igneous Province Clan A Mesoproterozoic Continental Flood Rhyolite Province: The end Member Example of the Large Igneous Province Clan

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.v53a2123p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #V53A-2123

Mathematics

Logic

1011 Thermodynamics (0766, 3611, 8411), 1033 Intra-Plate Processes (3615, 8415), 8410 Geochemical Modeling (1009, 3610)

Scientific paper

Aeromagnetic interpretation of rhyolite and dacite-flood-lavas of the upper Gawler Range Volcanics (>30,000 km3) suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows in excess of 100 kilometres in length. Pigeonite inversion thermometers from the terminal fronts of lobes spaced over 250km apart indicate eruption temperatures of 950 to 1100°C. The lavas are characterised by elevated halogen concentrations (~1600 ppm Fluorine, ~400 ppm Cl; minimum measurements due to potential loss from volatilisation) for silicic melt compositions. These depolymerised the melt structure such that combined temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests the felsic lavas had viscosities of < 3.5 log10[η (Pa s)]; approaching and corresponding to viscosities exhibited by basalts (< 3 log10[η (Pa s)]. A combination of these physicochemical properties has produced a Felsic Large Igneous Province (FLIP), which is directly analogous in emplacement style to the more common mafic large igneous provinces preserved throughout the geologic record. The viscosity of these felsic lavas has produced a unique magmatic system which is either not present or poorly preserved elsewhere on the planet.

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