Wong, Minn Lin; Wang, Xianfeng; Latrubesse, Edgardo M; He, Shaoneng; Bayer, Maximiliano (2021): Stable isotope (δ18O,δ13C) results of speleothems from Angelica Cave (central Brazil) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.938676
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Abstract:
Here we present a speleothem oxygen isotope (δ18O) and carbon isotope (δ13C) record from Angelica Cave in central Brazil (13.40°S, 46.23°W, ~585 m above sea level). The record is based on three stalagmite samples, AG1, AG2 and AG4. Ages of the samples were constrained by high-precision U-Th disequilibrium dating performed using a Thermo‐Fisher Scientific Neptune Plus multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS). The three samples have a combined temporal coverage of 0.1-6.8 kyr BP, roughly spanning the mid-to-late Holocene. Stable isotope values were measured using a GasBench coupled to a Delta-V isotope ratio mass spectrometer (IRMS) system. Angelica δ18O and δ13C values display an overall relatively flat trend with time. The Angelica Cave underlies the core of the South Atlantic Convergence zone (SACZ). The δ18O record can therefore be interpreted as proxy for SACZ rainfall intensity. The relatively flat δ18O trend over the past 6.8 kyr BP suggests that SACZ rainfall intensity remained largely invariant during the mid-to-late Holocene, despite the rising South Hemisphere summer insolation and increasing monsoon strength in the core South American Summer Monsoon zone. The Angelica δ18O record also shows no clear expression of abrupt North Atlantic events, such as the Little Ice Age, Medieval Climate Anomaly and Bond Events.
Supplement to:
Wong, Minn Lin; Wang, Xianfeng; Latrubesse, Edgardo M; He, Shaoneng; Bayer, Maximiliano (2021): Variations in the South Atlantic Convergence Zone over the mid-to-late Holocene inferred from speleothem δ18O in central Brazil. Quaternary Science Reviews, 270, 107178, https://doi.org/10.1016/j.quascirev.2021.107178
Related to:
Wong, Minn Lin; Wang, Xianfeng; Latrubesse, Edgardo M; He, Shaoneng; Bayer, Maximiliano (2021): Uranium-Thorium dating results of speleothems from Angelica Cave (central Brazil). PANGAEA, https://doi.org/10.1594/PANGAEA.938678
Funding:
Coverage:
Latitude: -13.400000 * Longitude: -46.240000
Minimum Elevation: 565.0 m * Maximum Elevation: 565.0 m
Event(s):
Comment:
Age in years before present (BP), where BP=1950 AD
δ18O and δ13C are reported in a delta notation, with respect to Vienna Pee Dee Belemnite (VPDB), where δ18O = [(18O/16O)sample/(18O/16O)standard – 1] × 1,000‰ and δ13C = [(13C/12C)sample/(13C/12C)standard – 1] × 1,000‰
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Wong, Minn Lin | |||
| 2 | AGE | Age | ka BP | Wong, Minn Lin | Geocode | |
| 3 | δ18O, carbonate | δ18O carb | ‰ PDB | Wong, Minn Lin | Isotope ratio mass spectrometer (IRMS) with a GasBench | |
| 4 | δ13C, carbonate | δ13C carb | ‰ PDB | Wong, Minn Lin | Isotope ratio mass spectrometer (IRMS) with a GasBench |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1191 data points