Proto Great Slave Lake.

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Presentation transcript:

Proto Great Slave Lake

Christmas tree bonfire Inuvik, NT

Wolfe & Morse 2015

Proto Great Slave Lake

Composition Percent Hg (ppm) As (ppm) Christmas Tree Bonfire Ash Unconformity Organics Mineroenics Proto Great Slave Lake

Down Core Frame Lake Arcellinida 1994 1962 Unconformity

Can move vertically in sediment column Arsenic is mobile Can move vertically in sediment column Arcellinida is non-mobile Can reflect in-situ As levels regardless of any post-depositional mobility. Giant Mine Property

Arcellinida (Testate Lobose Amoebae) Sensitive Bioindicators Nasser et al. 2016. Microb. Ecol.

Nasser et al. submitted

Nasser et al. submitted

Down core Statistical Arcellinida Analysis Baseline Limnological Assemblage Eutrophication Assemblage Urbanization-Mine Contamination Assemblage Urbanization-Mine Contamination Assemblage Contamination Assemblage Baseline Limnological Assemblage Eutrophication Assemblage “Broken Stick” CONISS Cluster Plot Three Assemblages at 30% Similarity MDS – Bray Curtis Similarity

Baseline Limnological Assemblage Down Core Frame Lake Arcellinida 1994 Unconformity 1962 Baseline Limnological Assemblage

Urbanization-Mine Contamination Assemblage Down Core Frame Lake Arcellinida 1994 Urbanization-Mine Contamination Assemblage 1962 Unconformity

Eutrophication Assemblage Down Core Frame Lake Arcellinida Eutrophication Assemblage 1994 1962 Unconformity

Composition Percent Hg (ppm) As (ppm) Eutrophication Assemblage Urbanization-Mine Contamination Assemblage Christmas Tree Bonfire Ash Unconformity Baseline Limnological Assemblage Organics Minerogenics Proto Great Slave Lake

Down-core Changes in As Concentrations 1800 Urbanization-Mine Contamination Assemblage Baseline Limnological Conditions Assemblage 1600 1400 1985 1200 Contamination Assemblage 1000 As Concentration (ppm) 800 1967 600 P = 0.03 400 200 1994 1962 Core Depth (cm)

Down-core Changes in LOI Parameters Urbanization-Mine Contamination Assemblage Mine Waste Contamination Post Overt Contamination Eutrophication Assemblage Baseline Limnological Conditions Assemblage 1980 P = 0.002 Contamination Assemblage P = 0.004 32 jumbled 14C dates 1994 1962

Inverse Distance Weighted (IDW) Interpolated As Concentration Ekman grabs collected to develop more comprehensive distributional map. Braden Gregory Michel Hache Modern Frame Lake surface sediments contain > 1500 ppm Arsenic .