# Tamboril Cave, Brazil 2000 Year Strontium and Oxygen Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 2.0 # 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/21550 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/tamboril2017sr.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothem # # Parameter_Keywords: oxygen isotopes #-------------------- # Contribution_Date # Date: 2017-02-27 #-------------------- # Title # Study_Name: Tamboril Cave, Brazil 2000 Year Strontium and Oxygen Isotope Data #-------------------- # Investigators # Investigators: Wortham, B.E.; Wong, C.I.; Silva, L.C.R.; McGee, D.; Montanez, I.P.; Rasbury, E.T.; Cooper, K.M.; Sharp, W.D.; Glessner, J.J.G.; Santos, R.V. #-------------------- # Description_and_Notes # Description: Oxygen (d18O), Carbon (d13C), and Strontium (87Sr/86Sr) isotope data from speleothems collected in Tamboril Cave, central Brazil, for the past 2,000 years. # # Replicate 87Sr/86Sr analysis # 713 UCD/ICPMS 0.7219 # 713 UCD/ICPMS 0.72178 # difference 1.21E-04 # 104.5 UCD/ICPMS 0.7229508 # 104.5 UCD/ICPMS 0.7229372 # difference 1.36E-05 # 454.2 FIRST 0.72223 0.722392 -0.000160 # 454.2 FIRST 0.72234 0.722442 -0.000100 #-------------------- # Publication # Authors: Barbara E. Wortham, Corinne I. Wong, Lucas C.R. Silva, David McGee, Isabel P. Montanez, E. Troy Rasbury, Kari M. Cooper, Warren D. Sharp, Justin J.G. Glessner, Roberto V. Santos # Published_Date_or_Year: 2017-04-01 # Published_Title: Assessing response of local moisture conditions in central Brazil to variability in regional monsoon intensity using speleothem 87Sr/86Sr values # Journal_Name: Earth and Planetary Science Letters # Volume: 463 # Edition: # Issue: # Pages: 310-322 # Report_Number: # DOI: 10.1016/j.epsl.2017.01.034 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0012821X17300468 # Full_Citation: # Abstract: Delineating the controls on hydroclimate throughout Brazil is essential to assessing potential impact of global climate change on water resources and biogeography. An increasing number of monsoon reconstructions from d18O records provide insight into variations in regional monsoon intensity over the last millennium. The strength, however, of d18O as a proxy of regional climate limits its ability to reflect local conditions, highlighting the need for comparable reconstructions of local moisture conditions. Here, speleothem 87Sr/86Sr values are developed as a paleo-moisture proxy in central Brazil to complement existing d18O-based reconstructions of regional monsoon intensity. Speleothem 87Sr/86Sr values are resolved using laser ablation and conventional solution mass spectrometry at high resolution relative to existing (non-d18O-based) paleo-moisture reconstructions to allow comparisons of centennial variability in paleo-monsoon intensity and paleo-moisture conditions. Variations in speleothem 87Sr/86Sr values from Tamboril Cave are interpreted to reflect varying extents of water interaction with the carbonate host rock, with more interaction resulting in greater evolution of water isotope values from those initially acquired from the soil to those of the carbonate bedrock. Increasing speleothem 87Sr/86Sr values over the last millennium suggest progressively less interaction with the carbonate host rock likely resulting from higher infiltration rates, expected under wetter conditions. Increasingly wetter conditions over the last millennium are consistent with an overall trend of increasing monsoon intensity (decreasing d18O values) preserved in many existing d18O records from the region. Such a trend, however, is absent in d18O records from our site (central Brazil) and Cristal Cave (southeast Brazil), suggesting the existence of divergent (relevant to d18Oprecip) shifts in the climate patterns within and outside the core monsoon region. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: ATM 1420079, AGS 1602962, EAR 1535824, MRI 0959524 #------------------ # Site_Information # Site_Name: Tamboril Cave # Location: South America>Brazil # Country: Brazil # Northernmost_Latitude: -16.364 # Southernmost_Latitude: -16.364 # Easternmost_Longitude: -46.904 # Westernmost_Longitude: -46.904 # Elevation: m #------------------ # Data_Collection # Collection_Name: Tamboril2017Sr # Earliest_Year: 2000 # Most_Recent_Year: -32 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology_Information # Chronology: # # Sample ID Depth (mm) Chemistry Date 238U ± (2s) 232Th ± (2s) d234U ± (2s) (230Th/238U) ± (2s) 230Th/232Th ± (2s) Age (uncorr) ± (2s) Age (corr)* ± (2s) d234U initial ± (2s) Age (corr) ± (2s) Lab # ng/g pg/g per mil activity ppm atomic yr yr per mil yr BP # BRZ8a 7 12/8/2014 1630 33 481 62 858.6 1.2 0.0010 0.00006 56 8 61 3 56.3 3.4 859 1.2 -9 3 MIT # BRZ8b 7 2/15/2015 1672 33 530 13 864.9 1.3 0.0011 0.00022 57 11 66 13 61.0 13.0 865 1.3 -4 13 MIT # BRZ9a 44 12/8/2014 2759 55 152 23 844.9 1.2 0.0029 0.00006 840 130 173 4 172.1 3.7 845 1.2 107 4 MIT # BRZ9b 44 12/30/2014 2479 50 105 45 843.8 1.4 0.0026 0.00007 990 430 156 4 155.5 3.9 844 1.4 91 4 MIT # BRZ9c 44 2/15/2014 2743 55 79 7 847.4 1.2 0.0026 0.00012 1410 140 151 7 150.2 7.3 848 1.2 86 7 MIT # BRZ B Top 77 11/23/2015 1351 27 745 17 846.6 1.4 0.0035 0.00006 102 2 209 3 199.8 5.7 847 1.4 134 6 MIT # BRZ B Bot 105 11/23/2015 2796 56 25 2 846.4 1.1 0.00353 0.00004 6262 572 209 2 208.4 2.2 847 1.1 142 2 MIT # BRZ11 248 12/30/2014 2841 57 84 3 847.1 1.4 0.0067 0.00010 3600 107 395 6 394.0 5.8 848 1.4 329 6 MIT # BRZ-6 385 11/23/2015 3703 74 297 7 847.6 1.1 0.00818 0.00010 1619 29 483 6 482.1 5.9 849 1.1 416 6 MIT # BRZ13 491 12/8/2014 4095 82 86 24 848.5 1.0 0.0118 0.00012 8900 2400 696 7 696.1 7.3 850 1.0 631 7 MIT # BRZ N 542 11/23/2015 3301 66 25 3 832.1 1.2 0.0127 0.00010 26770 2734 755 6 755.2 6.2 834 1.2 689 6 MIT # BRZP Top 591 11/9/2015 2233 45 183 4 911.3 1.2 0.0163 0.00006 3152 10 933 4 932.1 4.2 914 1.2 866 4 MIT # BRZP Bottom 626 11/9/2015 2487 50 8 0 985.8 1.2 0.0169 0.00010 80177 2242 930 5 930.4 5.4 988 1.2 865 5 MIT # BRZ14 634 12/8/2014 2852 57 169 70 1128.7 1.1 0.0204 0.00016 5500 2300 1048 8.4 1047.5 8.4 1132 1.1 983 8 MIT # BRZ15 677 12/30/2014 2589 52 65 2 1072.1 1.6 0.0223 0.00021 14200 370 1179 11 1178.0 11.0 1076 1.6 1113 11 MIT # BRZ tot Bot 790 11/9/2015 2159 43 104 2 1105.1 1.0 0.0392 0.00012 12996 29 2048 6 2047.8 6.4 1111 1.0 1982 6 MIT # # BA-M1 193 4/1/2014 2073 41 762 15 910 10 0.0056 0.00010 242 2 318 6 312 7 911 9.8 248 7 UCD # BA-M2 381 4/1/2014 4968 99 414 8 842 3 0.0094 0.00014 1800 5 558 8 556 8 843 2.9 492 8 UCD # # Interlab comparison analysis of sample splits from same horizons (BRZ9/10; BRZ 11/12) # BRZ10 44 10/8/2014 2569 52 68 1.4 856.4 2.6 0.0025 0.00004 761 20 145 4 144.6 3.6 857 2.6 80 4 BGC # BRZ12 248 10/8/2014 2477 50 28 0.6 849.9 2.9 0.0067 0.00007 4846 58 395 4 394.6 4.3 851 2.9 330 4 BGC # Notes: Corrected ages assume an initial 230Th/232Th of 4±2 ppm atomic; all 2sigma errors are given as absolutes; 0 BP = 1950; MIT - Mass. Institute of Tech.; BGC - Berkeley Geochronology Center; UCD - University of California Davis; Ages in grey were not used in construction of age model; replicate ages were averaged for construction of age/depth model # # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## depth_mm depth, , , mm, , , Depth from top , ,N ## lab Laboratory,,,,,,,,C ## 87Sr/86SrMC-ICP-MS Strontium 87/Strontium 86 ratio, calcium carbonate, , , ,speleothem, , MC-ICP-MS,N ## 87Sr/86SrTIMS Strontium 87/Strontium 86 ratio, calcium carbonate, , per mil VPDB, ,speleothem, , TIMS,N ## diff Method Difference,,,,,,,,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_mm lab 87Sr/86SrMC-IC-PMS 87Sr/86SrTIMS diff 806 FIRST 0.72114 0.721225 0.000083 797 0.721158 788 FIRST 0.72132 781 FIRST 0.72097 771 FIRST 0.7215 764 FIRST 0.7216 749 FIRST 0.72119 746 UCD/ICPMS 0.72092 743 UCD/ICPMS 0.7212 740 BC 0.721714 728 FIRST 0.72176 721 UCD/ICPMS 0.72242 719 UCD/ICPMS 0.7217 714.5 FIRST 0.72152 713 FIRST 0.72178 713 FIRST 0.7219 710 BC 0.721596 709 BC 0.721868 708 BC 0.721763 707 BC 0.721806 705 BC 0.721778 702 BC 0.721846 700 BC 0.721792 699 BC 0.72162 684 FIRST 0.72154 673 FIRST 0.72162 0.721683 0.000064 651 FIRST 0.72144 628 FIRST 0.72144 618 FIRST 0.72165 608 FIRST 0.72192 607 FIRST 0.72177 597 FIRST 0.72152 583 FIRST 0.72223 0.722392 0.000170 573 FIRST 0.7219 550 FIRST 0.7222 0.722301 0.000100 548 FIRST 0.72229 539 FIRST 0.72218 538 FIRST 0.7223 0.722422 0.000120 528 FIRST 0.72242 0.722502 0.000085 526 FIRST 0.72198 495 FIRST 0.72253 0.722608 0.000079 485 FIRST 0.72241 0.722481 0.000071 474.1 FIRST 0.72234 0.722442 0.000100 474 BC 0.722234 463.2 FIRST 0.72243 463.1 BC 0.722426 463 BC 0.721367 454 BC 0.722174 446 FIRST 0.72237 0.722448 0.000073 443 BC 0.722292 436 FIRST 0.72247 0.722532 0.000061 421 FIRST 0.72235 407 FIRST 0.72237 395 FIRST 0.72232 383 FIRST 0.72239 372 0.722381 0.720000 360 FIRST 0.7223 347 FIRST 0.7225 331 FIRST 0.72246 322 FIRST 0.72243 0.722472 0.000046 313 FIRST 0.72243 0.722484 0.000050 293.5 FIRST 0.72228 0.722339 0.000064 283 FIRST 0.72255 272 FIRST 0.72243 0.722491 0.000062 261 FIRST 0.72267 252 BC 0.722337 248.1 BC 0.722375 248 FIRST 0.72238 237 FIRST 0.72243 0.72249 0.000058 226 FIRST 0.72265 0.722705 0.000055 215 FIRST 0.72267 206 FIRST 0.72281 201 FIRST 0.72268 196 FIRST 0.72266 191 FIRST 0.72261 180 FIRST 0.72273 0.722761 0.000030 176 FIRST 0.72235 0.722579 0.000230 169 FIRST 0.72277 164 FIRST 0.72245 152 FIRST 0.72258 0.722616 0.000036 138 UCD/ICPMS 0.72242 136 FIRST 0.72294 129 UCD/ICPMS 0.72296 126 first 0.7229 119 UCD/ICPMS 0.72342 117 UCD/ICPMS 0.72249 111 UCD/ICPMS 0.72246 105 FIRST 0.72301 94 FIRST 0.72284 0.722883 0.000045 86 FIRST 0.72328 83 FIRST 0.72294 0.722958 0.000018 78 FIRST 0.72326 67 FIRST 0.72323 0.72315 -0.000084 66 FIRST 0.72296 58 FIRST 0.72292 0.722994 0.000076 48.5 FIRST 0.72299 18 BC 0.723196 17 BC 0.72335 16 BC 0.723461 11.5 FIRST 0.72354 1 FIRST 0.72362