Abstract
In sediments emerging on the scarp of Lower Orinoco River, Venezuela, we have discovered and studied large (0.5 m) features formed by a plinthite nucleus surrounded by evenly spaced concentric spheroidal structures of iron oxides separated by depletion zones. These features are located in sediments subjected to the mean annual river fluctuation (approx. 14 m) and hence are submerged for several months each year. To the best of our knowledge, structures like these have never been reported or studied. The nuclei and concentric ring formations found in the Orinoco sediments represent an extreme case of regular currently alternating redox conditions. Here we show that the concentric ferric rings surrounding the nuclei could be the result of repeated cycles of diffusion of ferrous ions during flood and subsequent precipitation as ferric oxide during the dry period, thus reflecting the seasonal fluctuation in river level. Our results are consistent with a simple proposed model of ferrous iron diffusion/oxidation according to the flood/dry intervals imposed by river dynamics. This paper is a contribution toward understanding these redoximorphic features (RFs) by: (1) describing their composition and mineralogy; (2) suggesting a possible mode of their formation using the switch to reducing conditions and diffusion of soluble Fe during flood, and its subsequent oxidation and hence immobilization and partial crystallization once exposed to the air; (3) by confirming how this theoretical approach fits the actual pattern of river hydrology in Orinoco, both under average conditions, and as modified by climatic extreme conditions influenced by the El Niño/La Niña Southern Oscillation (ENSO) affecting the ratio of flood/emergence.
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References
Ahmad AR, Nye PH (1990) Coupled diffusion and oxidation of ferrous iron in soils. I. Kinetics of oxygenation of ferrous iron in soil suspension. J Soil Sci 41:395–409
Asikainen CA, Werle SF (2007) Accretion of ferromanganese nodules that form pavement in Second Connecticut Lake New Hampshire. Proc Natl Acad Sci USA 104(45):17579–17581
Atkins JE, McBride EF (1992) Porosity and packing of Holocene river, dune and beach sands. Am Assoc Pet Geol Bull 76:339–355
Barge LM, Hammond DE, Chan MA, Potter S, Petruska J, Nealson KH (2011) Precipitation patterns formed by self-organizing processes in porous media. Geofluids 11(2):124–133
Beard BL, Johnson CM, Cox L, Sun H, Nealson KH, Aguilar C (1999) Iron Isotope biosignatures. Science 285:1889–1892
Beard BL, Johnson CM, Skulan JL, Nealson H, Cox L, Sun H (2003) Application of Fe isotopes to tracing the geochemical and biological cycling of Fe. Chem Geol 195:87–117
Borgaard O (1979) Selective extraction of amorphous iron oxides by EDTA from a Danish sandy loam. J Soil Sci 30:727–734
Carbón J, Schubert C (1994) Late Cenozoic history of the eastern llanos of Venezuela: geomorphology and stratigraphy of the Mesa Formation. Quatern Int 21:91–100
Chacón N, Dezzeo N, Muñoz B, Rodríguez JM (2005) Implications of soil organic carbon and the biogeochemistry of iron and aluminum on soil phosphorus distribution in flooded forests of the lower Orinoco River, Venezuela. Biogeochemistry 73:555–566
Chacón N, Flores S, González A (2006) Implications of iron solubilization on soil phosphorus release in seasonally flooded forests of the lower Orinoco river, Venezuela. Soil Biol Biochem 38:1494–1499
Chacón N, Dezzeo N, Rangel M, Flores S (2008) Seasonal changes in soil phosphorus dynamics and root mass along a flooded tropical forest gradient in the lower Orinoco river, Venezuela. Biogeochemistry 87:157–168
Chan MA, Parry WT, Bowman JR (2000) Diagenetic hematite and manganese oxides and fault-related fluid flow in Jurassic sandstones, southeastern Utah. AAPG Bull 84:1281–1310
Chan MA, Beitler B, Parry WT, Ormö J, Komatsu G (2004) A possible terrestrial analogue for hematite concretions on Mars. Nature 429:731–734
Chan MA, Johnson CM, Beard BL, Bowman JR, Parry WT (2006) Iron isotopes constrain the pathways and formation mechanisms of terrestrial oxide concretions: a tool for tracing iron cycling on mars? Geosphere 2(7):324–332. doi:10.1130/GES00051.1
Chan MA, Ormo J, Park AJ, Stich M, Souza-Egipsy V, Komatsu G (2007) Models of iron oxide concretion formation: field, numerical and laboratory comparisons. Geofluids 7:356–368
Cornell RM, Schwertmann U (2003) The iron oxides: structure, properties, reactions, occurrence and uses, 2nd edn. VCH, Weinheim
Crosby HA, Johnson CM, Roden EE, Beard BL (2005) Coupled Fe(II)–Fe(III) electron and atom exchange as a mechanism for Fe isotope fractionation during dissimilatory iron oxide reduction. Environ Sci Technol 39:6698–6704
Crosby HA, Roden EE, Johnson CM, Beard BL (2007) The mechanisms of iron isotope fractionation produced during dissimilatory Fe(III) reduction by Shewanella putrefaciens and Geobacter sulfurreducens. Geobiology 5:169–189
Dezzeo N, Worbes M, Ishii I, Herrera R (2003) Annual tree rings revealed by radiocarbon dating in seasonally flooded forest of the Mapire River, a tributary of lower Orinoco, Venezuela. Plant Ecol 168:165–175
Fimmen RL, de Richter DB, Vasudevan D, Williams MA, West LT (2008) Rhizogenic Fe–C redox cycling: a hypothetical biogeochemical mechanism that drives crustal weathering in upland soils. Biogeochemistry 87:127–141
García NO, Mechoso CR (2005) Variability in the discharge of South American rivers and in climate. Hydrol Sci J 50:459–478
Gasparatos D, Tarenidis D, Haidouti C, Oikonomou G (2005) Microscopic structure of soil Fe-Mn nodules: environmental implication. Environ Chem Lett 2:175–178
Gee GW, Bauder JW (1986) Particle-size analysis. In: Knute A (ed) Methods of analysis, part 1. Physical and mineralogical methods. Agronomy monograph no. 9. Soil Science Society of America, Madison, pp 383–411
Jackson ML (1958) Soil chemical analysis. Prentice-Hall, Englewood Cliffs
Kirk GJD, Ahmad AR, Nye PH (1990) Coupled diffusion and oxidation of ferrous iron in soils. II. A model of diffusion and reaction of O2, Fe2+, H+ and HCO3 − in soils and sensitivity analysis of the model. J Soil Sci 41:411–431
Labat D, Ronchail J, Guyot JL (2005) Recent advances in wavelet analyses: part 2-Amazon, Parana, Orinoco and Congo discharges time scale variability. J Hydrol 314:289–311
Lelong F (1966) Régime des nappes phréatiques continues dans la formations d`alteration tropicale. Consequences pour la pédogénese. (Water-table continuous regimes and the formation of alterites in tropical soils. Its consequences on pedogenesis (in French). Sci Terre 11:203–244
Lewis WM, Saunders JF (1989) Concentration and transport of dissolved and suspended substances in the Orinoco River. Biogeochemistry 7:203–240
Mehra O, Jackson M (1960) Iron oxide removal from soils and clays by dithionite-citrate system buffered with sodium carbonate. Clays Clay Miner 7:317–327
Munch J, Otto J (1980) Preferential reduction of amorphous to crystalline iron oxides by bacterial activity. Soil Sci 129:15–21
Nieto R, Gallego D, Trigo R, Ribera P, Gimeno L (2008) Dynamic identification of moisture sources in the Orinoco basin in equatorial South America. Hydrol Sci J 53(3):602–617
Paolini J (1995) Particulate and organic carbon and nitrogen in the Orinoco River (Venezuela). Biogeochemistry 29:59–70
Parry WT (2011) Composition, nucleation, and growth of iron oxide concretions. Sed Geol 233(1–4):53–68
Poveda G, Mesa OJ (1997) Feedbacks between hydrological processes in Tropical South America and large-scale ocean—atmospheric phenomena. J Clim 10:2690–2702
Poveda G, Waylen PR, Pulwarty RS (2006) Annual and inter-annual variability of the present climate in northern South America and southern Mesoamerica. Palaeogeogr Palaeoclimatol Palaeoecol 234:3–27
Rodríguez-Altamiranda R, Flores S, Herrera R (2011) Gestión sostenible del bosque inundable mediante la participación comunitaria en Mapire. Anzoátegui, Venezuela. In: Herrera FF, Herrera I (eds) Regeneración de Ecosistemas en Venezuela. Ediciones IVIC, Caracas, pp 149–165
Schöngart J, Junk WJ (2007) Forecasting the flood-pulse in Central Amazonia by ENSO-indices. J Hydrol 335:124–132
Schöngart J, Junk WJ, Piedade MTF, Ayres JM, Hüttermann A, Worbes M (2004) Teleconnection between tree growth in the Amazonian floodplains and the El Niño-Southern Oscillation effect. Glob Change Biol 10:683–692
Sivarajasingham S, Alexander L, Cady J, Cline M (1962) Laterite. Adv Agron 14:1–60
Sommers MG, Dollhopf ME, Douglas S (2002) Freshwater ferromanganese stromatolites from Lake Vermilion, Minnesota: microbial culturing and environmental scanning electron microscopy investigations. Geomicrobiol J 19:407–427
Spicar E (2004) Egendomliga bildningar I Dalasandstenen (Peculiar structures in sandstones of Dalarna (in Swedish). Geologiskt For 44:18–25
Stolt M, Ogg C, Baker C (1994) Strongly contrasting redoximorphic patterns in Virginia valley and ridge paleosols. Soil Sci Am Soc J 58:477–484
Thomaz SM, Bini LM, Bozelli RL (2007) Floods increase similarity among aquatic habitats in river-floodplain systems. Hydrobiologia 579:1–13. doi:10.1007/s10750-006-0285-y
Thompson A, Chadwick OA, Boman S, Chorover JO (2006a) Colloid mobilization during soil iron redox oscillations. Environ Sci Technol 40:5743–5749
Thompson A, Chadwick OA, Rancourt DG, Chorove J (2006b) Iron-oxide crystallinity increases during soil redox oscillations. Geochim Cosmochim Acta 70:1710–1727
van Wambeke A, Eswaren H, Herbillon AJ, Comerma J (1983) Oxisols. In: Wilding LP et al. (eds) Pedogenesis and soil taxonomy: II. the soil orders. Elsevier, New York, pp 325–354
Vegas-Vilarrubia T, Herrera R (1993) Effects of periodic flooding on the water chemistry and primary production of the Mapire river system (Venezuela). Hydrobiologia 262:31–43
Vepraskas M (1992) Redoximorphic features for identifying aquic conditions. NC Agric Res Serv Tech Bull 301. NC Agricultural Research Service, Raleigh
Vepraskas MJ, Faulkner SP (2000) Redox chemistry of hydric soils. In: Richardson JL, Vepraskas MJ (eds) Wetland soils: genesis hydrology landscapes and classification. Lewis, Boca Raton, pp 85–107
Wiederhold JG, Teutsch N, Kraemer SM, Halliday AN, Kretzschmar R (2007) Iron isotope fractionation during pedogenesis in redoximorphic soils. Soil Sci Soc Am J 71(6):1840–1850
Wu L, Beard BL, Roden EE, Kennedy CB, Johnson CM (2010) Stable Fe isotope fractionations produced by aqueous Fe(II)-hematite surface interactions. Geochim Cosmochim Acta 74(15):4249–4265
Acknowledgments
This work was financed entirely by the Venezuelan Institute of Scientific Research, IVIC. The authors dedicate this paper to the memory of Professor Dr. Richard Schargel (1938–2011). The contribution of two anonymous reviewers is gratefully acknowledged. We wish to express our gratitude to Mr. J. L. Vallés, Drs. M. Bezada, and L. D. Llambí for their assistance during the fieldwork, to Ms. G. Escalante, Mr. L. Lado, and D. Benzo for help with some of the analyses, and to Professor M. Puma and Dr. M. Lampo for their help with data processing and graphics. We also wish to thank Professors F. García-Golding, S. Glatzel, and A. Lidón for critical discussions of earlier versions of this manuscript and to Ms. A. Angulo for proof-reading the final version.
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Herrera, R., Chacón, N. Large-scale spheroidal redoximorphic features around plinthite nuclei in Orinoco River sediments reflect mean seasonal fluctuation in river stage and ENSO-related anomalies. Biogeochemistry 112, 197–208 (2013). https://doi.org/10.1007/s10533-012-9716-1
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DOI: https://doi.org/10.1007/s10533-012-9716-1