Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years

de Lacerda, L. D.; Cordeiro, R. C.; Turcq, B.; Sifeddine, A.

dc.contributor.author	de Lacerda, L. D.
dc.contributor.author	Turcq, B.
dc.contributor.author	Sifeddine, A.
dc.contributor.author	Cordeiro, R. C.
dc.date.accessioned	2019-01-25T16:36:28Z
dc.date.available	2019-01-25T16:36:28Z
dc.date.issued	2017
dc.identifier.uri	https://hdl.handle.net/20.500.12866/4843
dc.description.abstract	Total 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.	en_US
dc.language.iso	eng
dc.publisher	Elsevier
dc.relation.ispartofseries	Journal of South American Earth Sciences
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.rights.uri	https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject	amazon	en_US
dc.subject	deposition	en_US
dc.subject	climate	en_US
dc.subject	alta floresta	en_US
dc.subject	antarctica	en_US
dc.subject	atmospheric mercury	en_US
dc.subject	Deposition	en_US
dc.subject	emissions	en_US
dc.subject	Geology	en_US
dc.subject	greenland ice core	en_US
dc.subject	Mercury	en_US
dc.subject	northern brazil	en_US
dc.subject	Paleoclimate	en_US
dc.subject	record	en_US
dc.subject	Tropical lake	en_US
dc.title	Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years	en_US
dc.type	info:eu-repo/semantics/article
dc.identifier.doi	https://doi.org/10.1016/j.jsames.2017.04.008
dc.subject.ocde	https://purl.org/pe-repo/ocde/ford#1.05.00
dc.relation.issn	1873-0647