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de Lacerda L. D., Turcq Bruno, Sifeddine Abdelfettah, Cordeiro R. C. (2017). Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years. Journal of South American Earth Sciences, 77, 42-50. ISSN 0895-9811

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Lien direct chez l'éditeur doi:10.1016/j.jsames.2017.04.008

Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000405051600003
Auteursde Lacerda L. D., Turcq Bruno, Sifeddine Abdelfettah, Cordeiro R. C.
SourceJournal of South American Earth Sciences, 2017, 77, p. 42-50. ISSN 0895-9811
RésuméTotal Hg, TC, TN, goethite and siderite distributions in sediment cores from two locations across Caco) Lake (Brazil) identified paleoclimate factors that had affected the Hg deposition in this shallow tropical lake and its relationship with past climate and basin processes. Concentrations and fluxes of Hg were maximum in the Last Glacial Maximum (LGM), with averages of 397 ng g(-1), and 24.3 mu g m(-2) yr(-1), respectively, decreasing during the Heinrich Stadial 1 (H1) and further during the Meltwater pulse 1A (MWP-1A). The higher values during LGM and H1 were strongly associated with dust deposition as observed in Greenland ice cores. After a period of lower values, there was a significant increase of concentrations and fluxes during the Younger Dryas (193 ng g(-1) and 4.1 mu g m(-2) yr(-1)), still associated in part with dust deposition but also being influenced by the high volcanic activity of this period. Concentrations and fluxes decreased again to the lowest values during the Holocene from about 9500 to 2000 cal yr BP (114 ng g(-1) and 1.25 mu g m(-2) yr(-1)). Analyses of Pb-210 dated shorter cores shows increasing Hg accumulation rates during the past century, larger than in other period in the past but could not evidence the influence of colonial gold mining as suggested by earlier studies.
Plan de classementLimnologie physique / Océanographie physique [032] ; Pollution [038]
Descr. géo.BRESIL ; CACO LAC
LocalisationFonds IRD [F B010070298]
Identifiant IRDfdi:010070298
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070298

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