HR: 0800h
AN: ED51A-0013    [Abstracts]
TI: Modeling composition of partial melts in mantle upwellings through Earth history: an example of a 2D poster
AU: * Sparks, D W
EM: sparks@seaver.tamu.edu
AF: Texas A&M University, Dept. of Geology and Geophysics, TAMU, College Station, TX 77843-3115 United States
AU: Cheadle, M
EM: cheadle@uwyo.edu
AF: University of Wyoming, Dept. of Geology and Geophysics, Laramie, WY 82071-3006 United States
AB: The composition of magmas created by partial melting of the mantle depend on the interplay of several processes: the mantle phase diagram, the physics of magma migration through the mantle and crust, the patterns of solid-state mantle and fluid circulation and heat transfer, to name a few. This modeling study attempts a self-consistent combination of these physical and chemical processes, to predict the composition of magma created in upwelling mantle over a very broad range of mantle conditions, with particular emphasis on the deep past in a hot Archean mantle. We utilize 1) high P-T melting experiments to constrain the composition of melts formed at different depths in the mantle, 2) thermal and compositional solid-state convection models to constrain the temperature and melting rate and the three-dimensional distribution of these melts, and 3) simplified models of magma migration to predict the accumulation and mixing of these magmas, for comparison with mantle-derived primitive melts over time. An explanation of this study requires a description of details from a number of varied disciplines (Archean geology, trace element geochemistry, experimental petrology, solid-state convection, magma migration). While most interested poster readers will want to know the details of one or two aspects of the calculations, few will want to wade through them all. This goal of this poster design is to present the outline of the story in way that can be scanned quickly at a distance, but with several independent offshoots containing explanation of parts of the story that can be either read or skipped, and yet another level containing details for the experts on a particular topic.
DE: 0845 Instructional tools
SC: Education and Human Resourcese [ED]
MN: 2004 AGU Fall Meeting