@article{fdi:010079392,
  title = {{C}limate and hydrologic controls on late {H}olocene sediment supply to an {A}mazon floodplain lake},
  author = {{M}oreira, {L}. {S}. and {M}oreira {T}urcq, {P}atricia and {C}ordeiro, {R}. {C}. and {T}urcq, {B}runo and {A}niceto, {K}. {C}. and {M}oreira-{R}amirez, {M}. and {C}ruz, {A}. {P}. {S}. and {C}aquineau, {S}andrine and {S}ilva, {V}. {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}rganic and inorganic geochemical analyses on sediments from {P}reto {L}ake, a central {A}mazon basin floodplain water body, were used to document hydrological changes of the {S}olimoes {R}iver during the late {H}olocene. {B}etween 3600 and 400 cal yr {BP}, {P}reto {L}ake received smectite-rich sediment from the {S}olimoes {R}iver, with high concentrations of {A}l (similar to 53 x 10(3) ppm) and {S}i (similar to 210 x 10(3) ppm). {T}he high detrital input suggests there was a direct connection between {P}reto {L}ake and the main river channel. {H}igh river inflow maintained lake stage and was responsible for the contribution to sediments of phytoplankton-derived organic matter. {L}ow sediment organic carbon concentrations characterized this period (mean similar to 3.8 wt%), probably because of dilution by river-borne lithogenic matter. {A}lthough the river inputs remained high, abrupt increases in {TOC} content around 1800 and 1200 cal yr {BP} suggest brief increases in fluvial nutrient supply to {P}reto {L}ake. {D}uring the last 400 cal yr, substantial declines in smectite (mean 40%), {A}l (similar to 29 x 10(3) ppm) and {S}i (138 x 10(3) ppm) suggest the establishment of a semi-isolated lake, with reduced river inflow. {A} large proportion of {C}3-plant-derived organic matter, supplied by runoff from the kaolinite-rich watershed, was observed during this period, and was accompanied by high autochthonous primary production, driven by development of an aquatic macrophyte community. {T}his change in sediment organic matter source accounted for the greater {TOC} content (similar to 20%) of sediments deposited during this period. {A}lthough {H}olocene climate change was an important control on fluvial sediment supply to upper and lower {A}mazon {B}asin floodplain lakes, sedimentation processes in {P}reto {L}ake can also be linked to changes in the river's course. {T}he transition to a semi-isolated lake could have been a consequence of lateral and vertical sediment accretion, which formed a natural levee that blocked fluvial input to {P}reto {L}ake.},
  keywords = {{F}loodplain lakes ; {P}aleoclimate ; {L}ate {H}olocene ; {S}ediment organic matter ; {BRESIL} ; {AMAZONE} {BASSIN} ; {PRETO} {LAC} ; {SOLIMOES} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{J}ournal of {P}aleolimnology},
  volume = {64},
  numero = {4},
  pages = {389--403},
  ISSN = {0921-2728},
  year = {2020},
  DOI = {10.1007/s10933-020-00144-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079392},
}