81 Kr Dating at the Guliya Ice Cap, Tibetan Plateau
| Autor: | Zheng-Tian Lu, Guo-Min Yang, Florian Ritterbusch, Wei Jiang, Ji-Qiang Gu, Di Wang, Lide Tian, Shui-Ming Hu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
Plateau geography.geographical_feature_category 010504 meteorology & atmospheric sciences Atomic Physics (physics.atom-ph) Krypton FOS: Physical sciences chemistry.chemical_element Glacier 010502 geochemistry & geophysics 01 natural sciences Physics - Atomic Physics Geophysics (physics.geo-ph) Physics - Geophysics Geophysics Ice core chemistry General Earth and Planetary Sciences Radiometric dating Trace analysis Ice caps Geomorphology Geology 0105 earth and related environmental sciences Chronology |
| Zdroj: | Geophysical Research Letters. 46:6636-6643 |
| ISSN: | 1944-8007 0094-8276 |
| DOI: | 10.1029/2019gl082464 |
| Popis: | We present radiometric $^{81}$Kr dating results for ice samples collected at the outlets of the Guliya ice cap in the western Kunlun Mountains of the Tibetan Plateau. This first application of $^{81}$Kr dating on mid-latitude glacier ice was made possible by recent advances in Atom Trap Trace Analysis, particularly a reduction in the required sample size down to 1 $\mu$L STP of krypton. Eight ice blocks were sampled from the bottom of the glacier at three different sites along the southern edges. The $^{81}$Kr data yield upper age limits in the range of 15-74 ka (90% confidence level). This is an order of magnitude lower than the ages exceeding 500 ka which the previous $^{36}$Cl data suggest for the bottom of the Guliya ice core. It is also significantly lower than the widely used chronology up to 110 ka established for the upper part of the core based on $\delta^{18}$O in the ice. |
| Databáze: | OpenAIRE |
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