@article{fdi:010063599,
  title = {{A} mineralogical and organic geochemical overview of the effects of {H}olocene changes in {A}mazon {R}iver flow on three floodplain lakes},
  author = {{M}oreira, {L}. {S}. and {M}oreira {T}urcq, {P}atricia and {K}im, {J}. {H}. and {T}urcq, {B}runo and {C}ordeiro, {R}. {C}. and {C}aquineau, {S}andrine and {M}andeng {Y}ogo, {M}agloire and {D}amste, {J}. {S}. {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} synthesis of the impacts of the {A}mazon {R}iver hydrological changes on the sedimentation process of organic matter ({OM}) in three different floodplain lakes ({S}anta {N}inha, {M}araca, and {C}omprido lakes) is presented in this study. {T}oday the {S}anta {N}inha and {M}araca lakes are directly and permanently connected with the main channel of the {A}mazon {R}iver, in contrast to {C}omprido {L}ake, which is indirectly and periodically influenced by the {A}mazon {R}iver due to its greater distance from the main channel. {A}ll three lake sediment records showed a reduced river inflow due to thy climatic conditions during the early and middle {H}olocene followed by an increased fluvial input during the wetter late {H}olocene. {I}n {S}anta {N}inha and {M}araca {L}akes, the reduced river inflow period was recorded by sediments with a low abundance of smectite (on average similar to 20 wt.%), a clay mineral mainly transported by the fluvial system, high total organic carbon ({TOC}) contents (on average similar to 8.2 wt.%), and a predominantly acidic soil {OM} input evidenced by high concentrations (on average 180 mu g g({TOC})(-1)) of branched glycerol dialkyl glycerol tetraethers ({GDGT}). {D}uring the late {H}olocene, a higher smectite abundance (on average similar to 43 wt.%) and a lower {TOC} content (on average similar to 1.4 wt.%) pointed to greater dilution by riverine lithogenic matter. {T}his change was accompanied by a proportional increase in the aquatically produced crenarchaeol, suggesting a higher lake water level. {I}n {C}omprido {L}ake, a sedimentation gap occurred during the early and middle {H}olocene. {T}he wetter late {H}olocene, since 3000 cal years {BP}, was characterized by high {TOC} values (on average similar to 9 wt.%) and a sharp increase in soil {OM} input as recorded by an increase in branched {GDGT} concentrations (on average similar to 81 mu g g({TOC})(-1)), but the smectite content was low (on average similar to 14%). {T}his combination suggests that the soil {OM} input to {C}omprido {L}ake from the local catchment area became dominant during the wet-climate late {H}olocene due to the large distance of the lake from the {A}mazon {R}iver main channel. {C}onsequently, our study shows that the sedimentation processes of {OM} in {A}mazonian floodplain lakes were strongly influenced by variations in the hydrodynamic regime of the {A}mazon {R}iver during the {H}olocene. {H}owever, the impacts of the variations on the three floodplain lakes were different depending on the distance of each lake from the main channel of the {A}mazon {R}iver.},
  keywords = {{S}edimentary organic matter ; {G}lycerol dialkyl glycerol tetraethers ; {A}mazonian floodplain lakes ; {H}olocene ; {AMAZONE} {BASSIN} ; {BRESIL}},
  booktitle = {{C}ontinental and coastal marine records of centennial to millennial changes in {S}outh {A}merican climate since the last glacial maximum},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {415},
  numero = {no sp{\'e}cial},
  pages = {152--164},
  ISSN = {0031-0182},
  year = {2014},
  DOI = {10.1016/j.palaeo.2014.03.017},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063599},
}