# 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/keilambete2013loi.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: Keil02LOI # First_Year: 9456 # Last_Year: -29 # Time_Unit: cal. yr BP # Core_Length: 389cm # Notes: Loss on Ignition and water content 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_top_cm depth, , , cm, , , Top Depth of Sample, ,N, ## depth_bot_cm depth, , , cm, , , Bottom Depth of Sample, ,N, ## depth_cm depth, , , cm, , , Midpoint Depth of Sample, ,N, ## age_calBP age, , , calendar years before present, , , , ,N, ## water_content water content,Sediment,,% dry weight,,paleolimnology,,,N, ## LOI Loss on Ignition,Sediment,, % dry weight,,paleolimnology,,,N, # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: # depth_top_cm depth_bot_cm depth_cm age_calBP water_content LOI 1 2 1.5 -29 202 24.5 4 5 4.5 45 289 25.2 8 9 8.5 144 359 19.4 10 11 10.5 193 516 19.4 12 13 12.5 243 511 10.0 14 15 14.5 292 476 12.5 16 17 16.5 342 485 13.5 18 19 18.5 391 505 14.6 20 21 20.5 440 501 19.1 22 23 22.5 490 424 14.3 25 26 25.5 564 445 10.6 27 28 27.5 613 409 14.8 29 30 29.5 663 322 13.4 31 32 31.5 712 346 10.0 33 34 33.5 761 350 7.6 35 36 35.5 811 341 10.7 39.5 40 39.75 916 311 12.4 41 42 41.5 959 323 15.3 43 44 43.5 1008 326 13.1 45 46 45.5 1058 280 17.0 47 48 47.5 1107 300 22.2 49 50 49.5 1157 361 20.4 51 52 51.5 1206 393 28.6 53 54 53.5 1255 312 20.7 55 56 55.5 1305 341 23.8 57 58 57.5 1354 335 20.9 59 60 59.5 1404 456 19.3 61 62 61.5 1453 285 24.1 63 64 63.5 1502 215 26.5 65 66 65.5 1552 223 23.3 67 68 67.5 1601 251 21.0 69 70 69.5 1651 275 23.9 71 72 71.5 1700 526 33.1 75 76 75.5 1799 383 31.3 77 78 77.5 1848 449 24.4 79 80 79.5 1898 485 32.8 81 82 81.5 1947 436 23.2 83 84 83.5 1996 403 20.6 85 86 85.5 2046 292 27.9 87 88 87.5 2095 375 27.0 89 90 89.5 2145 491 23.1 91 92 91.5 2194 348 23.9 93 94 93.5 2243 516 21.4 97 98 97.5 2342 444 15.8 99 100 99.5 2392 433 11.7 100 101 100.5 2416 364 22.1 103 104 103.5 2490 461 15.9 106 107 106.5 2565 433 17.6 109 110 109.5 2639 363 25.9 112 113 112.5 2713 290 30.5 115 116 115.5 2787 383 18.1 118 119 118.5 2861 476 35.6 121 122 121.5 2935 469 31.4 124 125 124.5 3009 508 17.4 127 128 127.5 3083 496 16.0 130 131 130.5 3157 396 28.3 133 134 133.5 3231 463 21.0 136 137 136.5 3306 421 17.2 139 140 139.5 3380 367 22.3 144 145 144.5 3503 413 33.0 147 148 147.5 3577 388 29.7 150 151 150.5 3651 477 30.1 153 154 153.5 3725 472 26.2 156 157 156.5 3800 433 30.3 159 160 159.5 3874 465 18.7 162 163 162.5 3948 477 28.8 165 166 165.5 4022 428 33.2 169 170 169.5 4121 482 25.4 172 173 172.5 4195 522 24.0 175 176 175.5 4269 376 25.9 178 179 178.5 4343 393 18.9 181 182 181.5 4417 346 20.1 184 185 184.5 4491 366 19.6 187 188 187.5 4565 328 25.3 190 191 190.5 4639 301 26.2 194 195 194.5 4738 310 16.5 197 198 197.5 4812 296 24.9 200 201 200.5 4886 284 22.3 202 203 202.5 4936 266 22.8 204 205 204.5 4985 258 17.9 206 207 206.5 5035 234 14.9 208 209 208.5 5084 355 25.6 210 211 210.5 5133 357 24.3 212 213 212.5 5183 319 19.8 217 218 217.5 5306 335 14.4 219 220 219.5 5356 317 21.4 221 222 221.5 5405 321 19.7 223 224 223.5 5454 291 18.1 225 226 225.5 5504 318 18.4 227 228 227.5 5553 280 17.6 229 229.5 229.25 5596 310 18.5 232.5 233.5 233 5689 248 19.2 234.5 235.5 235 5739 239 18.7 236.5 237.5 237 5788 295 17.8 238.5 239.5 239 5837 298 16.5 240.5 241.5 241 5887 276 16.2 242.5 243.5 243 5936 280 14.5 244.5 245.5 245 5986 281 12.4 246.5 247.5 247 6035 293 17.4 251 252 251.5 6146 290 12.8 253 254 253.5 6195 301 13.4 255 256 255.5 6245 299 19.8 257 258 257.5 6294 280 22.5 259 260 259.5 6344 269 22.3 261 262 261.5 6393 276 20.7 263 264 263.5 6442 287 19.0 265 266 265.5 6492 305 19.8 267 268 267.5 6541 265 19.5 269 270 269.5 6591 279 19.7 271 272 271.5 6640 266 22.3 273 274 273.5 6689 247 20.9 275 276 275.5 6739 294 24.0 277 278 277.5 6788 306 25.2 279 280 279.5 6838 301 21.1 281 282 281.5 6887 333 17.4 283 284 283.5 6936 286 17.6 285 286 285.5 6986 305 6.5 287 288 287.5 7035 287 10.3 289 290 289.5 7085 272 15.5 295 296 295.5 7233 270 11.7 297 298 297.5 7282 278 14.0 299 300 299.5 7332 252 12.2 300 301 300.5 7356 251 13.4 303 304 303.5 7430 260 18.5 306 307 306.5 7505 265 15.8 309 310 309.5 7579 264 16.4 312 313 312.5 7653 269 16.6 315 316 315.5 7727 236 25.6 318 319 318.5 7801 204 19.6 321 322 321.5 7875 271 21.1 324 325 324.5 7949 276 19.6 327 328 327.5 8023 317 19.6 330 331 330.5 8097 294 22.9 333 334 333.5 8171 309 20.7 340 341 340.5 8344 211 21.7 343 344 343.5 8418 204 22.6 346 347 346.5 8493 204 19.7 349 350 349.5 8567 209 20.6 352 353 352.5 8641 177 17.7 355 356 355.5 8715 191 18.1 358 359 358.5 8789 189 19.8 361 362 361.5 8863 197 22.1 364 365 364.5 8937 234 22.5 367 368 367.5 9011 206 20.9 370 371 370.5 9085 190 19.2 373 374 373.5 9159 191 21.7 376 377 376.5 9234 206 25.4 379 380 379.5 9308 214 20.1 382 383 382.5 9382 196 25.0 385 386 385.5 9456 173 21.6