@article{fdi:010065214,
  title = {{P}alaeohydrological controls on sedimentary organic matter in an {A}mazon floodplain lake, {L}ake {M}araca ({B}razil) during the late {H}olocene},
  author = {{M}oreira, {L}.{S}. and {M}oreira {T}urcq, {P}atricia and {T}urcq, {B}runo and {C}ordeiro, {R}.{C}. and {K}im, {J}.{H}. and {C}aquineau, {S}andrine and {M}andeng {Y}ogo, {M}agloire and {M}acario, {K}.{D}. and {S}inninghe {D}amst{\'e}, {J}.{S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n order to understand the impact of hydrological changes of the {A}mazon {R}iver on sedimentary organic matter ({OM}) composition in {A}mazonian floodplain lakes, three sediment cores were collected from {L}ake {M}araca (eastern {A}mazonia) along a transect from the {A}mazon {R}iver main channel to inland. {T}he cores were dated with {C}-14 accelerator mass spectrometry ({AMS}) and studied by x-ray, mineralogical composition, total organic carbon ({TOC}) and total nitrogen ({TN}) contents, stable isotopic composition of {TOC} and {TN} ({C}-13({OC}) and {N}-15) and glycerol dialkyl glycerol tetraether ({GDGT}) distributions. {T}wo distinctive sedimentary depositional phases were identified based on the mineralogical composition and the geochemical characteristics of sedimentary {OM}. {D}uring the early-mid {H}olocene (similar to 13,000-3200 cal. yr {BP}), low values of {TOC} followed by a break in sedimentation suggest a complete drying of the lake caused by drier climatic conditions. {B}etween 3600 and 3200 cal. yr {BP}, this lake received a reduced influence of the {A}mazon {R}iver main stem. {T}his induced a predominant deposition of {C}-3-plant-derived {OM} supplied by surface erosion and runoff of acidic soil. {A} distinct connection of {L}ake {M}araca to the {A}mazon {R}iver began after 3200 cal. yr {BP} and became permanently established, with its modern characteristics, at 1880 cal. yr {BP}. {T}his change provoked an increased contribution of phytoplankton and semi-aquatic {C}-4 macrophytes as well as {C}-3 plant derived more alkaline soil {OM} to the sedimentary {OM} pool. {C}onsequently, our study demonstrates that the source of sedimentary {OM} in the {A}mazon floodplain lakes was strongly linked to the {A}mazon {R}iver hydrodynamics during the late {H}olocene. ({A}bstract author)},
  keywords = {{LAC} ; {PLAINE} {INONDABLE} ; {MATIERE} {ORGANIQUE} ; {SEDIMENT} ; {DATATION} ; {SPECTROMETRIE} ; {COMPOSITION} {MINERALOGIQUE} ; {CARBONE} {ORGANIQUE} ; {AZOTE} ; {ISOTOPE} ; {GEOCHIMIE} ; {EROSION} ; {RUISSELLEMENT} ; {ROCHE} {SEDIMENTAIRE} ; {HYDRODYNAMIQUE} ; {COURS} {D}'{EAU} ; {HOLOCENE} ; {PALEOHYDROLOGIE} ; {CHANGEMENT} {CLIMATIQUE} ; {SOL} {ACIDE} ; {BRESIL} ; {AMAZONIE} ; {AMAZONE} {BASSIN} {VERSANT} ; {MACARA} {LAC}},
  booktitle = {},
  journal = {{H}olocene},
  volume = {23},
  numero = {12},
  pages = {1903--1914},
  ISSN = {0959-6836 ; 1477-0911},
  year = {2013},
  DOI = {10.1177/0959683613508155},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065214},
}