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Proto Great Slave Lake.

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Presentation on theme: "Proto Great Slave Lake."— Presentation transcript:

1 Proto Great Slave Lake

2 Christmas tree bonfire Inuvik, NT

3 Wolfe & Morse 2015

4 Proto Great Slave Lake

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

6 Down Core Frame Lake Arcellinida
1994 1962 Unconformity

7 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

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

9 Nasser et al. submitted

10 Nasser et al. submitted

11 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

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

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

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

15 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

16 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)

17 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

18 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 .

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