Lynds Cave, Tasmania Speleothem Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: Lynds Cave, Tasmania Speleothem Data LAST UPDATE: 5/2006 (Original receipt by WDC Paleo) CONTRIBUTOR: Jian-xin Zhao, University of Queensland. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-047 SUGGESTED DATA CITATION: Xia, Q., et al. 2006. Lynds Cave, Tasmania Speleothem Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2006-047. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Xia, Q., J.-x. Zhao, and K. D. Collerson. 2001. Early–Mid Holocene climatic variations in Tasmania, Australia: multi-proxy records in a stalagmite from Lynds Cave. Earth and Planetary Science Letters, Vol. 194, Issues 1-2, pp. 177-187. 30 December 2001. doi:10.1016/S0012-821X(01)00541-6 ABSTRACT: Mass spectrometric uranium-series dating and C-O isotopic analysis of a stalagmite from Lynds Cave, northern Tasmania, Australia provide a high- resolution record of regional climate change between 5100 and 9200 yr before present (BP). Combined d18O, d13C, growth rate, initial 234U/238U and physical property (color, transparency and porosity) records allow recognition of seven climatic stages: Stage I (>9080 yr BP) – a relatively dry period at the beginning of stalagmite growth evidenced by elevated 234U/238U; Stage II (9080–8600 yr BP) – a period of unstable climate characterized by high-frequency variability in temperature and bio-productivity; Stage III (8600–8000 yr BP) – a period of stable and moderate precipitation and stable and high bio-productivity, with a continuously rising temperature; Stage IV (8000–7400 yr BP) – the warmest period with high evaporation and low effective precipitation (rainfall less evaporation); Stage V (7400–7000 yr BP) – the wettest period with highest stalagmite growth and enhanced but unstable bio-productivity; Stage VI (7000–6600 yr BP) – a period with a significantly reduced precipitation and bio-productivity without noticeable change in temperature; Stage VII (6600–5100 yr BP) – a period of lowest temperature and precipitation marking a significant climatic deterioration. Overall, the records suggest that the warmest climate occurred between 8000 and 7400 yr BP, followed by a wettest period between 7400 and 7000 yr BP. These are broadly correlated with the so-called 'Mid Holocene optimum' previously proposed using pollen and lake level records. However, the timing and resolution of the speleothem record from Lynds Cave are significantly higher than in both the pollen and lake level records. This allows us to correlate the abrupt change in physical property, d18O, d13C, growth rate, and initial 234U/238U of the stalagmite at ~8000 yr BP with a global climatic event at Early-Mid Holocene transition. GEOGRAPHIC REGION: Tasmania, Australia PERIOD OF RECORD: Early Holocene, 9200-5100 YrBP FUNDING SOURCES: Australia Research Council research fellowship to J.-x.Z.(ARF/F39802775), OPRS and University of Queensland Post-graduate research scholarships to Q.X., University of Queensland post-graduate travel award for Q.X.'s isotope work in China, ARC and U. Queensland support for Isotope Geochemistry Laboratory. DESCRIPTION: Stable isotope, growth rate, initial 234U/238U and physical property (color, transparency and porosity) records from a stalagmite in Lynds Cave, Tasmania, Australia. DATA: 1. U/Th Data Corr.Initial Sample NewSample Dist.(mm) U(ppm) ±2s 232Th(ppb) ±2s 230Th/232Th 234U/238U ±2s 230Th/238U ±2s Uncorr.Age ±2s Corr.Age(ka) ±2s 234U/238U ±2s LYN-T LYN-9 9 0.04074 0.00004 0.073 0.000 124.11 1.5927 0.0080 0.0731 0.0007 5.094 0.059 5.061 0.074 1.6016 0.0083 LYN-1 LYN-110 110 0.06133 0.00007 0.216 0.001 89.46 1.9942 0.0056 0.1039 0.0015 5.792 0.089 5.741 0.112 2.0114 0.0063 LYN-2B LYN-202 202 0.05971 0.00006 0.102 0.000 212.85 2.0208 0.0071 0.1194 0.0017 6.593 0.097 6.568 0.108 2.0405 0.0075 LYN-2 LYN-206 206 0.06262 0.00005 0.096 0.006 238.10 2.0129 0.0049 0.1200 0.0057 6.653 0.325 6.631 0.334 2.0325 0.0053 LYN-3 LYN-347 347 0.04859 0.00004 0.110 0.001 150.97 1.7723 0.0047 0.1126 0.0008 7.105 0.056 7.068 0.073 1.7884 0.0050 LYN-4 LYN-479 479 0.10182 0.00009 1.575 0.015 23.71 1.8223 0.0074 0.1209 0.0011 7.428 0.078 7.179 0.188 1.8428 0.0099 LYN-5 LYN-566 566 0.08708 0.00011 0.448 0.002 69.66 1.7683 0.0041 0.1180 0.0020 7.474 0.130 7.389 0.169 1.7857 0.0049 LYN-6B LYN-642 642 0.07578 0.00009 0.428 0.003 78.05 2.0908 0.0057 0.1453 0.0013 7.788 0.077 7.709 0.111 2.1166 0.0069 LYN-6B-R LYN-642 R 642 0.07148 0.00006 0.338 0.003 94.76 2.1069 0.0085 0.1475 0.0018 7.844 0.106 7.779 0.134 2.1330 0.0096 LYN-6 LYN-650 650 0.09248 0.00011 0.424 0.003 103.32 2.2104 0.0034 0.1562 0.0055 7.922 0.289 7.861 0.315 2.2392 0.0046 LYN-7 LYN-777 777 0.08353 0.00009 0.482 0.003 69.33 1.8026 0.0049 0.1318 0.0022 8.211 0.143 8.117 0.185 1.8225 0.0058 LYN-8 LYN-926 926 0.06679 0.00011 1.250 0.003 21.84 1.7088 0.0075 0.1347 0.0013 8.881 0.099 8.560 0.239 1.7299 0.0101 LYN-B2 LYN-1094 1094 0.09199 0.00015 0.844 0.010 60.02 2.2168 0.0077 0.1814 0.0031 9.218 0.166 9.097 0.216 2.2517 0.0099 LYN-B LYN-1119 1119 0.07209 0.00021 3.209 0.015 12.48 2.1107 0.0035 0.1832 0.0052 9.798 0.290 9.18 0.55 2.1540 0.0130 2. Isotope Data per mil (PDB) Sample Depth(mm) Dist(mm) Age(ka) d13C d18O L1 1113 12 5.081 -9.19 -3.81 L2 1098 27 5.182 -7.55 -3.48 L3 1083 42 5.283 -6.03 -3.04 L4 1068 57 5.384 -9.31 -3.49 L5 1053 72 5.485 -11.01 -3.98 L6 1041 84 5.566 -11.92 -4.66 L7 1023 102 5.687 -10.29 -4.73 L8 1008 117 5.804 -9.67 -4.32 L9 994 131 5.930 -8.94 -3.17 L10 979 146 6.065 -9.68 -3.91 L11 964 161 6.199 -9.44 -4.33 L12 949 176 6.334 -10.19 -4.00 L13 927 198 6.532 -9.71 -4.15 L14 910 215 6.613 -8.74 -4.17 L15 898 227 6.654 -8.59 -3.87 L16 881 244 6.713 -8.93 -3.65 L17 861 264 6.782 -9.04 -3.70 L18 841 284 6.851 -9.02 -3.47 L19 820 305 6.923 -8.05 -3.79 L20 804 321 6.978 -9.86 -3.70 L21 792 333 7.020 -10.64 -3.84 L22 777 348 7.069 -10.16 -3.73 L23 761 364 7.082 -9.27 -3.52 L24 744 381 7.097 -10.52 -3.82 L25 719 406 7.118 -11.35 -3.90 L26 695 430 7.138 -10.27 -4.03 L27 672 453 7.157 -11.17 -4.60 L28 637 488 7.201 -9.76 -3.83 L29 602 523 7.285 -10.71 -3.69 L30 584 541 7.329 -10.25 -3.90 L31 557 568 7.398 -9.41 -3.47 L32 532 593 7.513 -8.89 -3.43 L33 500 625 7.659 -8.75 -3.58 L34 482 643 7.742 -9.26 -3.24 L35 452 673 7.824 -9.81 -3.40 L36 422 703 7.909 -9.63 -3.43 L37 399 726 7.973 -10.13 -3.23 L38 372 753 8.049 -9.97 -3.91 L39 342 783 8.135 -9.98 -3.72 L40 317 808 8.209 -10.19 -4.04 L41 289 836 8.292 -10.19 -4.05 L42 263 862 8.370 -10.54 -3.94 L43 233 892 8.459 -11.00 -4.03 L44 211 914 8.524 -10.61 -4.19 L45 186 939 8.575 -10.65 -4.40 L46 167 958 8.596 -11.10 -3.80 L47 143 982 8.624 -10.81 -4.22 L48 124 1001 8.645 -9.80 -3.68 L49 105 1020 8.667 -11.09 -3.85 L50 97 1028 8.676 -10.54 -4.14 L51 70 1055 8.707 -10.03 -3.81 L52 38 1087 8.743 -10.46 -3.38 L53 23 1102 8.888 -10.73 -4.24 3. Summary Interpretations Stage Time(Ka) C O Lin.growth cm/ka Vol.growthcm3/ka Init 234U/238 Inferred Temp. Inferred precip Inferred bio-productivity 1 9.18-8.75 low low 4.7 160 2.15-2.21 low very dry 2 8.75-8.56 low, unstable intermediate, decreasing, unstable 87.6 2910 1.73 medium, dropping very wet high 3 8.56-7.95 low, increasing, stable low, increasing, stable 37.6 1450 1.82 low, rising relatively wet high, decreasing 4 7.95-7.39 high, initially increasing, then decreasing, stable highest, stable 23.7 1190 2.12-2.24 high relatively dry low 5 7.39-7.00 low, highly unstable intermediate, highly unstable 61.5 4360 1.79-1.84 medium very wet high 6 7.00-6.60 Highest, stable Intermediate and then rapidly decreasing 30.8 1550 medium, dropping relatively wet low 7 6.60-5.06 intermediate till 6.2 ka, then highly unstable, iso. disequ. lowest till 6.2 ka, then highly unstable, iso.diseq. 13.4 450 2.01-2.04 low very dry relatively low