Fields of Study
Subduction zone magmatism and volcanism
Mexican volcanic arc
Experimental petrology
Thermodynamic properties of silicate liquids
Link to Curriculum Vitae
View Rebecca
Lange's C.V.
About Rebecca
Lange
Research Interests
My research addresses how magmatism and volcanism have shaped the evolution of the solid Earth. I'm especially interested in the rate and mechanism by which continental crust forms at subduction zones. This interest takes my research group to the Mexican Volcanic Arc, where we are documenting magma eruption rates, the proportions of different erupted magma types, and the role of water in creating the unique compositional character and stratification of continental crust. We additionally use thermodynamics to extract information about the temperature, pre-eruptive water contents, depth (pressure), and crystallization history of magmas. An example is our new model of the plagioclase-liquid hygrometer/thermometer. Finally, we are involved in measuring various thermodynamic properties of silicate and carbonate liquids; the goal is to use these data is to calculate crystal-melt equilibrium at any condition in the crust and mantle. We are using a new frequency-sweep acoustic interferometer to measure sound speeds in a wide variety of melt compositions in order to develop an improved equation of state (P-V-T relation) for magmatic liquids.
Publications
Selected Recent Publications
Lange RA, Frey HM, Hector J (2009) A thermodynamic model for the plagioclase-liquid hygrometer/thermometer. American Mineralogist, 94, 494-506.
Ai Y and Lange RA (2008) New acoustic velocity measurements on CaO-MgO-Al2O3-SiO2 liquids: reevaluation of the volume and compressibility of CaMgSi2O6-CaAl2Si2O8 liquids to 25 GPa. Journal of Geophysical Research, 113, B4, B04203.
Ownby S, Delgado Granados H, Lange RA, Hall CM (2007) Volcán Tancítaro, Michoacán, Mexico: 40Ar/39Ar constraints on its history of sector collapse. Journal of Volcanological and Geothermal Research, doi:10.1016/j.jvolgeores.2006.10.009
Lange RA (2007) The density and compressibility of KAlSi3O8 liquid to 6.5 GPa. American Mineralogist, 92: 114-123.
Frey HM, Lange RA, Hall CM, Delgado-Granados H, Carmichael ISE (2007) A Pliocene ignimbrite flare-up along the Tepic-Zacoalco Rift corridor: further evidence for the initial stages of rifting of the Jalisco Block (Mexico) away from North America. Geological Society of America Bulletin, 119: 49-64.
Liu Q, Ai Y and Lange RA (2007) Acoustic velocity measurements on Na2O-TiO2-SiO2 liquids: evidence for a highly compressible TiO2 component related to five-coordinated Ti. Geochimica et Cosmochimica Acta, 71, 4314-4326.
Lewis-Kenedi CB, Lange RA, Hall CM, and Delgado-Granados H (2005) The eruptive history of the Tequila volcanic field, western Mexico: ages, volumes and relative proportions of lava types. Bulletin of Volcanology, 67: 391-414.
Ai Y and Lange RA (2004) An ultrasonic frequency-sweep interferometer for liquids at high temperature and pressure 2. Mechanical assembly, signal processing, and application. Journal of Geophysical Research 109: B12204, doi:10.1029/2004JB003062.
Liu Q and Lange RA (2003) New density measurements on carbonate liquids and the partial molar volume of the CaCO3 component. Contributions to Mineralogy and Petrology, 146: 370-381.
Lange RA (2002) Constraints on the minimum, pre-eruptive volatile concentrations in the Columbia River flood basalts. Geology, 30: 179-182.
Ochs FA and Lange RA (1999) The density of hydrous magmatic liquids. Science, 283, 1314-1317.
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