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Movement of iron and aluminum in a series of palesols on a parabolic dune at Cape Kiwanda, Oregon

Movement of iron and aluminum in a series of palesols on a parabolic dune at Cape Kiwanda, Oregon. Karen R. Carroll, Mary Dietrich, and Scott F. Burns Portland State University Department of Geology. Location. Cape Kiwanda. Paleosols in sand dune. 3 rd Paleosol up (from bottom).

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Movement of iron and aluminum in a series of palesols on a parabolic dune at Cape Kiwanda, Oregon

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  1. Movement of iron and aluminum in a series of palesols on a parabolic dune at Cape Kiwanda, Oregon Karen R. Carroll, Mary Dietrich, and Scott F. Burns Portland State University Department of Geology

  2. Location Cape Kiwanda

  3. Paleosols in sand dune 3rd Paleosol up (from bottom)

  4. Objectives • Are Fe and Al increasing, decreasing, or neither in the soils overall as soil development age increases? • Is translocation of Fe and Al occurring from the A B horizons or from upper B lower B horizons? • Is spodosol development occurring?

  5. Paleosol 1 (P1) - Typic Eutropsamment Ab Bwb

  6. Paleosol 2 (P2) Typic Humitropept Ab Btjb Bwb

  7. Paleosol 3 (P3)Typic Humitropept Ab Btjb Bwb

  8. Paleosol 4 (P4)Typic Humitropept Ab Bwb Ab (P3)

  9. Methods • Citrate-Dithionite extraction for Fe and Al (modified Mehra and Jackson, 1960) - new rotational method • Acid-Oxalate extraction for Fe and Al (modified McKeague and Day, 1966) - new rotational method • Atomic Absorption Spectrometer

  10. Iron (ppm)

  11. Aluminum (ppm)

  12. Conclusions • As soil development age increases past 1000 years, Fe and Al increase • Leaching of Al between buried B horizons occurs in two of the four soils and indicates that leaching begins to occur by 820 years of soil development • Leaching of Fe does not begin until sometime after 1420 years of soil development • There are no E horizons present (yet) • Future work could include subdividing A horizons to look for Fe/Al anomolies that could lead to an E horizon

  13. Acknowledgements We would like to thank Ben Perkins, Sherry Cady, and Marina Drazba of Portland State University for equipment use and assistance, supplies, expertise and creative ideas, and Amanda Carroll for lab assistance

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