# Lake Keilambete, SE Australia Holocene Sediment Data and Lake Level #----------------------------------------------------------------------- # 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/22430 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/keilambete2013d18o.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: lake level, population abundance, geochemistry, reconstruction, physical property, oxygen isotopes #-------------------- # Contribution_Date # Date: 2017-07-10 #-------------------- # File_Last_Modified_Date # Date: 2017-07-10 #-------------------- # Title # Study_Name: Lake Keilambete, SE Australia Holocene Sediment Data and Lake Level #-------------------- # Investigators # Investigators: Wilkins, D.; Gouramanis, C.; De Deckker, P.; Fifeld, L. K.; Olley, J. #--------------------------------------- # Description_Notes_and_Keywords # Description: Multiproxy Holocene sediment data and lake level reconstructions from Lake Keilambete, southwestern Victoria, Australia # Provided Keywords: delta O-18, maar lake, Modern Analogue Technique, ostracod, precipitation/evaporation, Sr/Ca, western Victoria, southeastern Australia, climate-change, southern Australia, maar lakes, variability, sediments, history, core #--------------------------------------- # Publication # Authors: Daniel Wilkins, Chris Gouramanis, Patrick De Deckker, L. Keith Fifield, Jon Olley # Published_Date_or_Year: 2013-02-06 # Published_Title: Holocene lake-level fluctuations in Lakes Keilambete and Gnotuk, southwestern Victoria, Australia # Journal_Name: Holocene # Volume: 23 # Edition: # Issue: 6 # Pages: 784-795 # Report Number: # DOI: 10.1177/0959683612471983 # Online_Resource: http://journals.sagepub.com/doi/10.1177/0959683612471983 # Full_Citation: # Abstract: Reconstructed Holocene lake-level curves from two saline, hydrologically closed maar crater lakes in southwestern Victoria, Australia, show near synchronous lake-level changes throughout the Holocene. We show that lake levels, reconstructed from sediment particle size and ostracod valve chemistry (d18O and Sr/Ca) have undergone rapid (<100 yr), large (>10 m) fluctuations throughout the Holocene. Finer sampling resolution shows a more sensitive response to Holocene climate than was previously presented for Lake Keilambete. Both maar crater lakes show a short-lived maximum in Holocene lake levels around 7.2 ka. The period of lake filling leading to peak lake levels matches the phase of most effective precipitation (7.4-7.0 ka) reconstructed from a high-resolution speleothem record from northern Tasmania. Water levels declined in both lakes during the mid Holocene, with a more substantive decline after ~5 ka which coincides with the end of the Southern Hemisphere hypsithermal. Water levels continued to oscillate with a periodicity of around 300-700 years, before reaching a late-Holocene nadir around 1.8 ka (Keilambete) and 1.3 ka (Gnotuk). The trend and periodicity of oscillations in the maar water levels show commonalities to dD in the Dome C ice core, and suggest that temperature may be a significant component in influencing the Precipitation/Evaporation (P/E) ratio in southeastern Australia during the Holocene. #--------------------------------------- # Publication # Authors: Daniel Wilkins, Patrick De Deckker, L. Keith Fifield, Chris Gouramanis, Jon Olley # Published_Date_or_Year: 2012-06-01 # Published_Title: Comparative optical and radiocarbon dating of laminated Holocene sediments in two maar lakes: Lake Keilambete and Lake Gnotuk, south-western Victoria, Australia # Journal_Name: Quaternary Geochronology # Volume: 9 # Edition: # Issue: # Pages: 3-15 # Report Number: # DOI: 10.1016/j.quageo.2012.01.008 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S1871101412000106 # Full_Citation: # Abstract: Sediment core chronologies of optical dates on single-grains/very small aliquots of sand-sized quartz are compared with Accelerator Mass Spectrometry (AMS) radiocarbon (14C) chronologies from ostracod carbonate, mixed carbonates, sedimentary organic matter and charcoal in order to establish the age of laminated Holocene sediments in maar crater lakes Keilambete and Gnotuk, Victoria, Australia. Samples for optical and AMS 14C dating were taken from the same Mackereth cores, allowing a direct comparison of the two techniques from two laminated sedimentary sequences. Additional AMS 14C samples were taken from water in Lake Keilambete and from groundwater discharging into Lake Keilambete from the crater wall, with equivalent reservoir ages of 150 ± 30 and 1940 ± 30 years respectively. AMS 14C dating of modern ostracod carbonate in Lake Keilambete demonstrates a reservoir age of 670 ± 175 years. Optical dating of 'single-grain/very small aliquots' of sand-sized-quartz indicate the presence of a radiocarbon reservoir in Lake Keilambete that is consistent with that measured on modern ostracods, and also demonstrate that there is no 14C reservoir in Lake Gnotuk during the Holocene. The chronology presented here supports the premise that previously published bulk conventional 14C dates from Lake Keilambete were affected by old carbon, meaning that past chronologies require revision. Limitations on the use of optical dating of single-grain/very small aliquots include the relative paucity of sand-sized quartz, which decreases the precision of the sample equivalent dose (De), and is further confounded by low environmental dose rates and resultant large uncertainties on the final age assessment. Nevertheless, evidence for partial bleaching confirms that single-grain quartz dating is the most appropriate luminescence technique, and may prove a useful alternative in situations where 14C dating is unsuitable or an alternative chronometer is required. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Australian Research Council # Grant: DP034493 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Commonwealth Scientific and Industrial Research Organisation (CSIRO) # Grant: Land and Water scholarship #--------------------------------------- # Site Information # Site_Name: Lake Keilambete # Location: Australia/New Zealand>Australia # Country: Australia # Northernmost_Latitude: -38.207 # Southernmost_Latitude: -38.207 # Easternmost_Longitude: 142.878 # Westernmost_Longitude: 142.878 # Elevation: 120 m #--------------------------------------- # Data_Collection # Collection_Name: Keil02d18O # First_Year: 9550 # Last_Year: 0 # Time_Unit: cal. yr BP # Core_Length: 389cm # Notes: Ostracod d18O data from Lake Keilambete core Keil02 #--------------------------------------- # Chronology_Information # Chronology: # # Lab ID ANUA-36023 ANUA-34203 ANUA-34204 ANUA-36024 ANUA-34205 ANUA-35105 ANUA-34206 ANUA-35106 ANUA-35107 ANUA-36013 ANUA-35108 ANUA-34208 ANUA-35109 ANUA-34207 # Dated material ostracod foraminifera ostracod ostracod ostracod ostracod ostracod gyttja gyttja gyttja charcoal ostracod foraminifera ostracod # depth_bot (cm) 17 52.3 78 101 129 145 164 208 258 295 337 363 388 # depth_top (cm) modern 16 51.8 77 99 128 143 163 207 257 294 336 362 386 # age (bp) # age14C (bp) 750 1755 1815 2940 3730 4000 4200 5470 5300 6460 7310 8720 9370 # age_error (years) 170 170 175 190 175 170 180 180 270 210 185 185 175 # calibrated age (cal BP) # 2-sigma error of cal age (years) # cal_age_range_old (bp) 160 1100 1185 2380 3380 3725 3975 5705 5490 7510 7625 9100 9920 # cal_age_range_young (2_s) -4 765 895 1945 2960 3325 3550 5280 4890 7150 7300 8600 9470 # notes modern sample 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir 1s age range includes 670±175 yr reservoir # # OSL Dates # Core depth_top_cm depth_bot_cm Age (YBP) small error*a large error*b # KEIL02 2 4 240 0.06 0.07 # KEIL02 6 8 370 0.17 0.24 # KEIL02 24 26 800 0.14 0.19 # KEIL02 73 75 1880 0.37 0.38 # KEIL02 119 121 2610 0.31 0.33 # KEIL02 142 144 3380 0.43 0.52 # KEIL02 166 168 4190 0.46 0.51 # KEIL02 192 194 5320 0.5 0.58 # KEIL02 211 213 5480 0.51 0.59 # KEIL02 230 232 6280 0.57 0.66 # KEIL02 249 251 6290 0.56 0.66 # KEIL02 291 293 7850 0.75 0.94 # KEIL02 336 338 7750 0.63 0.75 # KEIL02 386 388 9690 1.56 2.12 # # *a small error incorporates random uncertainty and 2.5% uncertainty associated with equivalent dose measurement # *b large error incorporates all systematic and random uncertainties # #--------------------------------------- # 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_cm depth, , , cm, , , Midpoint Depth of Sample, ,N, ## age_calkaBP age, , , calendar kyears before present, , , , ,N, ## d18Oost delta 18O, ostracod tests,,per mil VPDB,,paleolimnology,,Isotope ratio mass spectrometer,N, ## d18OA.rob delta 18O, A. robusta ostracod tests,,per mil VPDB,,paleolimnology,,Isotope ratio mass spectrometer,N, ## d18OD.comp delta 18O, D. compacta ostracod tests,,per mil VPDB,,paleolimnology,,Isotope ratio mass spectrometer,N, ## d18OM.prae delta 18O, M. praenuncia ostracod tests,,per mil VPDB,,paleolimnology,,Isotope ratio mass spectrometer,N, ## d18OA.becc delta 18O, A. beccarii ostracod tests,,per mil VPDB,,paleolimnology,,Isotope ratio mass spectrometer,N, # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: # depth_cm age_calkaBP d18Oost d18OA.rob d18OD.comp d18OM.prae d18OA.becc 0 0.000 0.5 0.134 2.44 2.44 1.5 0.159 3 0.195 3.68 3.68 4.5 0.231 5.5 0.256 3.22 3.22 7.5 0.304 4.06 4.06 9.5 0.353 4.28 4.28 11.5 0.401 4.39 4.39 13.5 0.450 15.5 0.498 17.5 0.547 18.5 0.571 19.5 0.596 21.5 0.644 23.5 0.693 25.5 0.741 49.5 1.324 51.4 1.370 1.78 1.78 52.05 1.386 3.51 3.51 52.6 1.399 3.94 3.94 53.55 1.422 2.79 2.79 54.7 1.450 2.75 2.75 56.5 1.494 2.52 2.52 58.5 1.542 2.26 2.26 60.5 1.591 2.58 2.58 62.5 1.639 2.43 2.43 64.5 1.688 2.16 2.16 66.5 1.736 2.3 2.3 68.5 1.785 2.17 2.17 70.5 1.834 2.96 2.96 72.5 1.882 2.65 2.65 74.5 1.931 2.23 2.23 76.5 1.979 1.97 1.97 78.5 2.028 2.28 2.28 80.5 2.076 2.5 2.5 82.5 2.125 2.39 2.39 84.5 2.173 2.94 2.94 86.5 2.222 1.64 1.64 88.5 2.270 2.64 2.64 90.5 2.319 2.6 2.6 92.5 2.368 1.79 1.79 94.5 2.416 2.6 2.6 95.5 2.440 96.5 2.465 2.48 2.48 98.5 2.513 2.69 2.69 99.5 2.537 3.02 3.02 100.5 2.562 3.87 3.87 102.5 2.610 3.73 3.73 104.5 2.659 3.81 3.81 106.5 2.707 4 4 108.5 2.756 3.16 3.16 110.5 2.804 3.13 3.13 112.5 2.853 114.5 2.902 2.72 2.72 116.5 2.950 3.21 3.21 122.5 3.096 3.82 3.82 124.5 3.144 4.68 4.68 126.5 3.193 4.16 4.16 128.5 3.241 3.29 3.29 130.5 3.290 3.63 3.63 132.5 3.339 4.01 4.01 134.5 3.387 3.58 3.58 136.5 3.436 4.24 4.24 138.5 3.484 140.5 3.533 142.5 3.581 4.35 4.35 143.5 3.606 2.5 2.5 144.5 3.630 145.5 3.654 3.12 3.12 146.5 3.678 3.99 3.99 148.5 3.727 3.69 3.69 150.5 3.775 3.82 3.82 152.5 3.824 3.97 3.97 154.5 3.873 3.53 3.53 156.5 3.921 4.61 4.61 158.5 3.970 4.25 4.25 160.5 4.018 4.48 4.48 162.5 4.067 4.34 4.34 164.5 4.115 3.47 3.47 166.5 4.164 3.39 3.39 168.5 4.212 3.87 3.87 170.5 4.261 172.5 4.309 174.5 4.358 176.5 4.407 178.5 4.455 180.5 4.504 3.03 3.03 182.5 4.552 184.5 4.601 186.5 4.649 188.5 4.698 190.5 4.746 3.83 3.83 192.5 4.795 194.5 4.843 196.5 4.892 4.04 4.04 198.5 4.941 202.5 5.038 204.5 5.086 3.15 3.15 206.5 5.135 328.5 8.096 330.5 8.145 332.5 8.193 334.5 8.242 2.67 2.67 336.4 8.288 3.28 3.28 338.65 8.343 2.75 2.75 340.8 8.395 3.04 3.04 342.05 8.425 2.85 2.85 344.4 8.482 3.2 3.2 346.5 8.533 2.96 348.5 8.582 3.36 3.36 352.5 8.679 1.49 1.49 354.25 8.721 3.05 3.05 355.4 8.749 0.8 0.8 357.65 8.804 1.25 1.25 360.05 8.862 2.27 2.27 0.43 362.4 8.919 1.53 364.4 8.968 0.76 367.8 9.050 1.48 1.48 369.8 9.099 1.74 1.74 371.8 9.147 374.15 9.204 1.64 1.64 0.73 376.9 9.271 379.05 9.323 381.2 9.375 383.25 9.425 385.3 9.475 386.3 9.499 387.3 9.524 388.4 9.550