Uranium-Thorium dating results of speleothems from Angelica Cave (central Brazil)
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2021
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| _version_ | 1867169148077867008 |
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| author | Wong, Minn Lin Wang, Xianfeng Latrubesse, Edgardo M He, Shaoneng Bayer, Maximiliano |
| author_facet | Wong, Minn Lin Wang, Xianfeng Latrubesse, Edgardo M He, Shaoneng Bayer, Maximiliano |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_938678 |
| institution | PANGAEA |
| language | en |
| publishDate | 2021 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Uranium-Thorium dating results of speleothems from Angelica Cave (central Brazil) Wong, Minn Lin Wang, Xianfeng Latrubesse, Edgardo M He, Shaoneng Bayer, Maximiliano AG; Age, 230Thorium; Age, 230Thorium, uncorrected; Age, dated; Age, dated, standard deviation; Angelica_Cave; Brazil; Depth, relative; MULT; Multiple investigations; Sample code/label; South American Monsoon System; Speleothems; Stable isotope; Thorium-230/Thorium-232 atomic ratio; Thorium-230/Thorium-232 atomic ratio, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation; δ234 Uranium (0); δ234 Uranium (0), standard deviation 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. |
| title | Uranium-Thorium dating results of speleothems from Angelica Cave (central Brazil) |
| topic | AG; Age, 230Thorium; Age, 230Thorium, uncorrected; Age, dated; Age, dated, standard deviation; Angelica_Cave; Brazil; Depth, relative; MULT; Multiple investigations; Sample code/label; South American Monsoon System; Speleothems; Stable isotope; Thorium-230/Thorium-232 atomic ratio; Thorium-230/Thorium-232 atomic ratio, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation; δ234 Uranium (0); δ234 Uranium (0), standard deviation |
| url | https://doi.org/10.1594/PANGAEA.938678 |