2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Paper No. 3
Presentation Time: 8:30 AM

Paleo-Viscometry of Magma Bodies

HÖINK, Tobias, Earth Science, Rice University, MS126, 6100 Main St, Houston, TX 77005, LEE, Cin-Ty, Earth Science, Rice Univ, MS 126, 6100 Main St, Houston, TX 77005, HAWTHORNE, Jessica C., Geosciences Department, Princeton, Princeton, NJ 08544 and LENARDIC, Adrian, Keith Wiess School of Earth Science, Rice University, P.O. Box 1892, Houston, TX 77251-1892, tobias.hoeink@rice.edu

Viscosity and water content are among the most important characteristics of magma bodies. However, once magma has erupted or solidified, such properties of the original magma are difficult to constrain directly. For an ensemble of rhythmically layered magmatic sills and dikes we present a simple model of crystallization and crystal settling that allows one to obtain a melt viscosity estimate when combined with field observations. If the composition of the parental magma is roughly known and an estimate of its liquidus temperature is known, the viscosity can be used to infer water content.