Viscosity of evolving magmas: a case study of the Glass House Mountains, Australia

Abstract The viscosity of the remelted rock compositions Glass House Mountains, SE Queensland, Australia, has been determined via micro-penetration in high-viscosity regime (10 8 –10 13 Pa s). heat capacity these melts also from room temperature to above glass transition. combination two data sets allows fitting by Adam-Gibbs equation using configurational C p conf (T g 12 ) and entropy S ). resulting fit parameters allow robust extrapolation higher viscosities 10 –4 s. This can now be used discussion emplacement magmas plugs, laccoliths, sills dykes that form Mountains complex plate motion plume responsible for volcano plugs. large increase evolving magma decrease discharge rate volcanic vents suggest very little appeared as extrusive lavas or pyroclastic material are mainly remnants intrusive bodies exposed erosion.