# McCargoe Cove, Lake Superior 8,800 Year Sediment Geochemical Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/28790 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/michigan/mccargoe2015c-n.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology # # Dataset DOI: # # Parameter_Keywords: geochemistry, physical properties #--------------------------------------- # Contribution_Date # Date: 2020-01-09 #--------------------------------------- # File_Last_Modified_Date # Date: 2021-03-31 #--------------------------------------- # Title # Study_Name: McCargoe Cove, Lake Superior 8,800 Year Sediment Geochemical Data #--------------------------------------- # Investigators # Investigators: Pompeani, D.P.; Abbott, M.B.; Bain, D.J.; DePasqual, S.; Finkenbinder, M. #--------------------------------------- # Description_Notes_and_Keywords # Description: Sediment geochemical data from cores D12 and E12, McCargoe Cove, Isle Royale National Park, Michigan, for the past 8800 years. # File updated 2021-03-31: Age column re-labled to yearsBP; originally incorrectly labeled yearsAD. Data values unchanged. # Provided Keywords: Anthropocene, archaeology, lead, Michigan, Old Copper Complex, pollution, copper mining, sediment #--------------------------------------- # Publication # Authors: David P. Pompeani, Mark B. Abbott, Daniel J. Bain, Seth DePasqual, and Matthew S. Finkenbinder # Published_Date_or_Year: 2015-02-01 # Published_Title: Copper mining on Isle Royale 6500-5400 years ago identified using sediment geochemistry from McCargoe Cove, Lake Superior # Journal_Name: The Holocene # Volume: 25 # Edition: # Issue: 2 # Pages: 253-262 # Report Number: # DOI: 10.1177/0959683614557574 # Online_Resource: https://journals.sagepub.com/doi/full/10.1177/0959683614557574 # Full_Citation: # Abstract: Isle Royale, in Lake Superior, contains evidence of indigenous copper mining; however, the timing and geographical extent of mining activity is poorly known. We analyzed metal, carbon, nitrogen, and organic matter concentrations to document past mining pollution in sediment cores recovered from McCargoe Cove; a long, narrow inlet of Lake Superior on Isle Royale that receives drainage from a watershed that contains numerous ancient copper mines. At McCargoe Cove, concentrations of lead, copper, and potassium increase in the sediments after ad 1860 and between 6500 and 5400 years before ad 1950 (yr BP). Metal pollution increases at McCargoe Cove exceed natural (or background) levels and coincide with radiocarbon dates associated with copper artifacts and existing lead pollution reconstructions from lakes on the Keweenaw Peninsula. Interestingly, a coherent cessation of lead emissions at multiple study sites after ~5400 yr BP coincides with the onset of dry conditions found in regional paleoclimate proxy records. After ~5000 yr BP, lead concentrations on both Isle Royale and the Keweenaw Peninsula remain at background levels until the onset of modern lead pollution ~ad 1860. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Geological Society of America # Grant: Graduate Student Research Award #--------------------------------------- # Site Information # Site_Name: McCargoe Cove # Location: North America>United States Of America>Michigan # Country: United States Of America # Northernmost_Latitude: 48.0923 # Southernmost_Latitude: 48.0923 # Easternmost_Longitude: -88.7044 # Westernmost_Longitude: -88.7044 # Elevation: 182 #--------------------------------------- # Data_Collection # Collection_Name: McCargoe2015C-N # First_Year: 8431 # Last_Year: -56 # Time_Unit: cal yr BP # Core_Length: 2.75 # Notes: cores D12 and E12 #--------------------------------------- # Chronology_Information # Chronology: # # ID date type # C14_age conventional radiocarbon date, years before 1950AD # cal_BP radiometric age in calendar years before 1950AD # error one standard deviation error in years # depth core depth in cm # # thickness thickness of sample in cm # ID C14_age cal_BP error depth thickness # Pb-210 NaN -58 1 0.25 1 # Pb-210 NaN -53 1 2.25 1 # Pb-210 NaN -45 2 4.25 1 # Pb-210 NaN -37 2 6.25 1 # Pb-210 NaN -23 2 8.25 1 # Pb-210 NaN -5 3 10.25 1 # Pb-210 NaN 14 3 12.25 1 # Pb-210 NaN 42 5 14.25 1 # Pb-210 NaN 104 22 16.25 1 # radiocarbon 340 NaN 20 26.25 1 # radiocarbon 2160 NaN 20 133.5 1 # radiocarbon 3640 NaN 60 225.5 1 # radiocarbon 3745 NaN 20 237.5 1 # radiocarbon 7980 NaN 260 276.25 0.5 # radiocarbon 8020 NaN 220 276.75 0.5 # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth depth,,,centimeter,,paleolimnology,,,N,average depth of sample ## age age,,,calendar year before present,,paleolimnology,,,N,best age estimate in CLAM ## C carbon,,,dry weight %,,paleolimnology,,,N, ## N nitrogen,,,dry weight %,,paleolimnology,,,N, #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: depth age C N 1.25 -56 11.55 0.89 3.25 -49 9.96 0.78 5.25 -41 9.99 0.77 7.25 -30 9.41 0.72 9.25 -14 8.79 0.66 11.25 4 7.79 0.56 13.25 28 7.45 0.52 15.25 73 6.40 0.45 17.25 134 5.04 0.37 19.25 191 4.86 0.36 25.25 364 5.15 0.37 29 440 5.24 0.37 40.5 633 7.39 0.55 50.5 802 7.01 0.53 60.5 971 4.64 0.36 70.5 1139 5.73 0.41 80.5 1308 4.69 0.36 90.5 1477 4.46 0.35 100.5 1645 4.57 0.36 110.5 1814 3.76 0.31 120.5 1983 3.41 0.28 121.5 2000 4.09 0.33 131.5 2168 3.89 0.31 141.5 2355 3.87 0.33 151.5 2546 4.29 0.36 161.5 2737 4.34 0.36 171.5 2928 3.67 0.31 181.5 3119 3.53 0.30 191.5 3310 3.10 0.26 201.5 3501 2.77 0.25 202.5 3520 3.26 0.28 212.5 3711 2.84 0.25 222.5 3902 3.00 0.27 232.5 4043 4.14 0.39 242.5 4722 0.88 0.09 244.5 4969 1.28 0.12 246.5 5216 1.47 0.13 248.5 5464 1.37 0.12 250.5 5711 0.95 0.10 252.5 5958 1.42 0.12 254.5 6206 0.81 0.08 256.5 6453 0.81 0.08 258.5 6700 0.67 0.07 260.5 6947 0.47 0.05 262.5 7195 0.33 0.04 272.5 8431 0.33 0.03