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Heat Diffusion in Basaltic lavas

Explore the heat diffusion and isotope formation in basaltic lavas, from lava emplacement to soil formation. Study the process of rising magma, lava flow, preserved sunburn isotope generation, and rest period dynamics. Discover the significance of cosmogenic isotopes in soil formation and geological dating.

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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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