Evidence for Holocene changes in Australian-Indonesian monsoon rainfall from stalagmite trace element and stable isotope ratios
Michael L Griffiths, Russell N Drysdale, Michael K Gagan, Silvia Frisia, Jian-xin Zhao, Linda K Ayliffe, Wahyoe S Hantoro, John C Hellstrom, Matthew J Fischer, Yue-Xing Feng, Bambang W Suwargadi
Earth and Planetary Science Letters | ELSEVIER | Published : 2010
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 δ18O and δ13C, throughout the record. This suggests that the Mg/Ca and Sr/Ca ratios are dominated by prior calcite precipitation, a process wh..View full abstract
Awarded by Australian Research Council
We thank N. Anderson, G. Smith, and the Indonesian Institute of Sciences (LIPI) for logistical support and technical assistance with fieldwork, which was carried out under LIPI Research Permit number 04057/SU/KS/2006. This study was supported by an Australian Postgraduate Award to M.L.G. and Australian Research Council grant DP0663274 to M.K.G., J.-x. Z., R.N.D, and W.S.H. We thank N. Abram, K. Johnson and one anonymous reviewer for their insightful comments, which greatly improved the overall quality of the manuscript. We also thank Ian Fairchild for useful discussion and comments regarding the manuscript.