دورية أكاديمية
Evidence for Holocene changes in Australian-Indonesian monsoon rainfall from stalagmite trace element and stable isotope ratios
| العنوان: | Evidence for Holocene changes in Australian-Indonesian monsoon rainfall from stalagmite trace element and stable isotope ratios |
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| المؤلفون: | Griffiths, ML, Drysdale, RN, Gagan, MK, Frisia, S, Zhao, JX, Ayliffe, LK, Hantoro, WS, Hellstrom, JC, Fischer, MJ, Feng, YX, Suwargadi, BW |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2010 |
| المجموعة: | The University of Queensland: UQ eSpace |
| مصطلحات موضوعية: | Trace elements, Speleothem, Stable isotopes, Australian-Indonesian summer monsoon, 1901 Earth and Planetary Sciences (miscellaneous), 1906 Geochemistry and Petrology, 1908 Geophysics, 1912 Space and Planetary Science |
| الوصف: | Trace element and stable isotope ratios from an active stalagmite (LR06-B1) recovered from Liang Luar Cave on the island of Flores (eastern Indonesia) are used to reconstruct the position of the austral summer inter-tropical convergence zone and Australian-Indonesian summer monsoon variability during the Holocene. Uranium-series dating of the stalagmite shows that it commenced growth 12,640 years ago, with hiatuses spanning 8,560 to 6,420 and 3,670 to 2,780 years ago. Stalagmite Mg/Ca and Sr/Ca ratios correlate significantly with one another, and with delta O-18 and delta C-13, throughout the record. This suggests that the Mg/Ca and Sr/Ca ratios are dominated by prior calcite precipitation, a process whereby degassing in the vadose zone during periods of low recharge causes deposition of calcite and disproportionate loss of Ca2+ ions (relative to Mg2+ and Sr2+) 'upstream' of the stalagmite. The degree of initial U-234/U-238 disequilibrium also appears to have been controlled by recharge to the overlying aquifer. Together with the Mg/Ca, Sr/Ca, and delta O-18 values, the initial uranium isotope activity ratios ([U-234/U-238](1))) imply a generally drier early Holocene, coincident with a lower sea level and lower Southern Hemisphere summer insolation. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0012-821X 1385-013X |
| العلاقة: | orcid:0000-0002-8279-323X; orcid:0000-0002-2413-6178; orcid:0000-0002-2944-9632; DP0663274 |
| الإتاحة: | https://doi.org/10.1016/j.epsl.2010.01.002Test https://espace.library.uq.edu.au/view/UQ:203378Test |
| رقم الانضمام: | edsbas.53428149 |
| قاعدة البيانات: | BASE |
| تدمد: | 0012821X 1385013X |
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