Chronology of the atmospheric mercury in Lagoa Da Pata Basin upper Rio Negro region of Brazilian Amazon

G. M. Santos; R. C. Cordeiro; E. V. Silva Filho; B. Turcq; L. D. Lacerda; L. K. Fifield; P. R.S. Gomes; P. A. Hausladen; A. Sifeddine; A. L.S. Albuquerque

doi:10.1017/s0033822200041473

Chronology of the atmospheric mercury in Lagoa Da Pata Basin upper Rio Negro region of Brazilian Amazon

G. M. Santos, R. C. Cordeiro, E. V. Silva Filho, B. Turcq, L. D. Lacerda, L. K. Fifield, P. R.S. Gomes, P. A. Hausladen, A. Sifeddine, A. L.S. Albuquerque

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Abstract

We present prehistoric mercury accumulation rates in a dated sediment core from Lagoa da Pata, a remote lake in São Gabriel da Cachoeira, northern Amazon. The sediment samples were subdivided for mercury and radiocarbon analyses. A group of 18 samples have been prepared at ANU for ¹⁴C dating by accelerator mass spectrometry (AMS). The dating results show a good correlation with depth in the core, down to 41,500 BP. Three distinct sections are clearly identified in the core. They consist of upper and lower organic-rich layers, separated by an inorganic layer which represents a short period of rapid accumulation around 18 ka BP. The mercury accumulation rate is found to be larger in the upper layer (18 ka to present) than in the lower one (41 ka to 25 ka), by a factor of three. The larger accumulation rate of mercury is probably associated with warmer temperatures and a higher frequency of forest fires during the Holocene.

Original language	English
Pages (from-to)	801-808
Number of pages	8
Journal	Radiocarbon
Volume	43
Issue number	2 PART II
DOIs	https://doi.org/10.1017/s0033822200041473
Publication status	Published - 2001

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title = "Chronology of the atmospheric mercury in Lagoa Da Pata Basin upper Rio Negro region of Brazilian Amazon",

abstract = "We present prehistoric mercury accumulation rates in a dated sediment core from Lagoa da Pata, a remote lake in S{\~a}o Gabriel da Cachoeira, northern Amazon. The sediment samples were subdivided for mercury and radiocarbon analyses. A group of 18 samples have been prepared at ANU for 14C dating by accelerator mass spectrometry (AMS). The dating results show a good correlation with depth in the core, down to 41,500 BP. Three distinct sections are clearly identified in the core. They consist of upper and lower organic-rich layers, separated by an inorganic layer which represents a short period of rapid accumulation around 18 ka BP. The mercury accumulation rate is found to be larger in the upper layer (18 ka to present) than in the lower one (41 ka to 25 ka), by a factor of three. The larger accumulation rate of mercury is probably associated with warmer temperatures and a higher frequency of forest fires during the Holocene.",

author = "Santos, {G. M.} and Cordeiro, {R. C.} and {Silva Filho}, {E. V.} and B. Turcq and Lacerda, {L. D.} and Fifield, {L. K.} and Gomes, {P. R.S.} and Hausladen, {P. A.} and A. Sifeddine and Albuquerque, {A. L.S.}",

year = "2001",

doi = "10.1017/s0033822200041473",

language = "English",

volume = "43",

pages = "801--808",

journal = "Radiocarbon",

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TY - JOUR

T1 - Chronology of the atmospheric mercury in Lagoa Da Pata Basin upper Rio Negro region of Brazilian Amazon

AU - Santos, G. M.

AU - Cordeiro, R. C.

AU - Silva Filho, E. V.

AU - Turcq, B.

AU - Lacerda, L. D.

AU - Fifield, L. K.

AU - Gomes, P. R.S.

AU - Hausladen, P. A.

AU - Sifeddine, A.

AU - Albuquerque, A. L.S.

PY - 2001

Y1 - 2001

N2 - We present prehistoric mercury accumulation rates in a dated sediment core from Lagoa da Pata, a remote lake in São Gabriel da Cachoeira, northern Amazon. The sediment samples were subdivided for mercury and radiocarbon analyses. A group of 18 samples have been prepared at ANU for 14C dating by accelerator mass spectrometry (AMS). The dating results show a good correlation with depth in the core, down to 41,500 BP. Three distinct sections are clearly identified in the core. They consist of upper and lower organic-rich layers, separated by an inorganic layer which represents a short period of rapid accumulation around 18 ka BP. The mercury accumulation rate is found to be larger in the upper layer (18 ka to present) than in the lower one (41 ka to 25 ka), by a factor of three. The larger accumulation rate of mercury is probably associated with warmer temperatures and a higher frequency of forest fires during the Holocene.

AB - We present prehistoric mercury accumulation rates in a dated sediment core from Lagoa da Pata, a remote lake in São Gabriel da Cachoeira, northern Amazon. The sediment samples were subdivided for mercury and radiocarbon analyses. A group of 18 samples have been prepared at ANU for 14C dating by accelerator mass spectrometry (AMS). The dating results show a good correlation with depth in the core, down to 41,500 BP. Three distinct sections are clearly identified in the core. They consist of upper and lower organic-rich layers, separated by an inorganic layer which represents a short period of rapid accumulation around 18 ka BP. The mercury accumulation rate is found to be larger in the upper layer (18 ka to present) than in the lower one (41 ka to 25 ka), by a factor of three. The larger accumulation rate of mercury is probably associated with warmer temperatures and a higher frequency of forest fires during the Holocene.

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DO - 10.1017/s0033822200041473

M3 - Article

SN - 0033-8222

VL - 43

SP - 801

EP - 808

JO - Radiocarbon

JF - Radiocarbon

IS - 2 PART II

ER -

Chronology of the atmospheric mercury in Lagoa Da Pata Basin upper Rio Negro region of Brazilian Amazon

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