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Heat Diffusion in Basaltic lavas

Heat Diffusion in Basaltic lavas . Andres Hernandez EPS 109 . Lava emplacement and cosmogenic isotope formation. s urface. t=0. r ising magma. l ava flow . t=1. rest p eriod . n, ,µ. c osmogenic isotope generation (preserved sunburn). s oil f ormation. t=2. s econd eruption.

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Heat Diffusion in Basaltic lavas

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  1. Heat Diffusion in Basaltic lavas Andres Hernandez EPS 109

  2. Lava emplacement and cosmogenic isotope formation surface t=0 rising magma lava flow t=1 rest period n, ,µ cosmogenic isotope generation (preserved sunburn) soil formation t=2 second eruption second lava flow t=3 cosmogenic isotope generation (preserved sunburn) rest period t=4 soil formation

  3. Kaua’i, Hawaii Outcrop Photo Kōloa member lava (600,000 yrs) flow from a gravel quarry in Kaua’i, Hawaii. Schematic diagram of exposure dating for basalts. 3He and 21Ne concentrations decay exponentially with depth both to a background value at ~3m. Larger concentrations reflect longer periods of exposure and the shape of the curve shows possible erosion or soil formation rates. 3He and 21Ne Concentration Depth ~ 3m Flow 2 Soil formation between eruptions 3He and 21Ne Concentration Depth ~ 3m Flow 1

  4. Where are the gases trapped?

  5. 1D Heat diffusion Boundary Conditions Initial temperature of the lava T0 = 1200 C Temperature of the air and ground T_air = T_ground = 25 C

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