@article{fdi:010060818,
  title = {{P}eatland ferruginization during late {Q}uaternary in the {U}beraba {P}lateau ({S}outh-{E}astern {B}razil)},
  author = {{M}eunier, {J}. {D}. and {V}arajao, {A}. {F}. {D}. {C}. and {V}arajao, {C}. {A}. {C}. and {C}olin, {F}abrice and {G}rauby, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}ue to the poor preservation of old peat formations and the limited research developed on them, the contribution of peat oxidation to the global {C} cycle at geological scales is poorly understood. {I}ron duricrusts containing abundant well-preserved plant structures have been reported above {H}umic {G}leysols in the {U}beraba {P}lateau ({B}razil). {W}e show that the iron accumulation results from an in-situ impregnation of peat, fast enough to preserve the plant structures. {T}he formation of iron oxides results from two processes: precipitation in the pores and {C}/{F}e replacement. {T}he iron duricrusts were probably triggered by oxidation of the peatland following dry climatic events during the last 50 kyr. {T}he large amount of iron dissolved in peatland waters was immobilized contemporaneously with the destruction of organic matter. {T}he oxidation of organic matter from the lower peat, dated at ca 24-27 kyr {BP}, may have released between 0.08 and 2.26 kg {CO}2 m(-2) yr(-1) in the atmosphere. {T}hese rates are in a good agreement with present-day measurements of {CO}2 release from drained peatlands. {A}lthough peatland formation has been identified as a significant contributor to the global {CO}2 uptake, our findings suggest that natural peatland oxidation should also be considered as a source of atmospheric {CO}2 during past climate change.},
  keywords = {{P}eatland ; {I}ron duricrust ; {B}razil ; {L}atosol ; {O}xidation ; {C}arbon dynamics ; {C}limate change ; {BRESIL}},
  booktitle = {},
  journal = {{J}ournal of {S}outh {A}merican {E}arth {S}ciences},
  volume = {43},
  numero = {},
  pages = {25--32},
  ISSN = {0895-9811},
  year = {2013},
  DOI = {10.1016/j.jsames.2012.12.004},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060818},
}