globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.10.030
论文题名:
Natural attrition and growth frequency variations of stalagmites in southwest Sulawesi over the past 530,000 years
作者: Scroxton N.; Gagan M.K.; Dunbar G.B.; Ayliffe L.K.; Hantoro W.S.; Shen C.-C.; Hellstrom J.C.; Zhao J.-X.; Cheng H.; Edwards R.L.; Sun H.; Rifai H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 823
结束页码: 833
语种: 英语
英文关键词: Australasian monsoon ; Indonesia ; Palaeoclimatology ; Stalagmite growth ; U-Th dating
英文摘要: Previous studies have analysed the age distributions of stalagmites harvested from multiple caves and inferred important palaeoclimate changes that explain stalagmite growth phases. However, stalagmites may grow over tens of thousands of years; thus, they are irreplaceable. The value of speleothems to science must be weighed against their potential and current aesthetic and cultural value. In this study, we show that some palaeoclimate information can be extracted from a cave system without the removal of stalagmites. Our case study is based on basal U-Th dates for 77 individual stalagmites from thirteen caves located in and around Bantimurung-Bulusaraung National Park, southwest Sulawesi, Indonesia. The stalagmites grew during discrete intervals within the last ~ 530,000 years, and an analysis of their age distribution shows a first-order exponential decrease in the number of older stalagmites surviving to the present day. Further, this exponential relationship is observed in stalagmite populations around the world and is therefore likely to be a general cave phenomenon. Superimposed on the first-order exponential age distribution in southwest Sulawesi are positive anomalies in stalagmite growth frequency at 425-400, 385-370, 345-335, 330-315, 160-155, 75-70 and 10-5 ka, which are typically coincident with wet periods on Borneo. To explain this distribution, we present a simple model of stalagmite growth and attrition. A first-order trend is controlled by processes intrinsic to karst systems that govern the natural attrition of stalagmites. These processes are nearly constant over time and result in the observed exponential relationship of stalagmite basal ages. Second-order variation is controlled by changes in the rate of stalagmite generation caused by fluctuating climates, which is a well-known concept in the speleothem literature. Removal of the exponential baseline allows for better assessment of relative peak heights and basic palaeoclimate information to be inferred. Importantly, the first- and second-order growth frequency variations can be characterised using basal stalagmite ages only, without the removal of stalagmites, thereby helping reduce the impact of scientific sampling on the cave environment. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68635
Appears in Collections:过去全球变化的重建

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作者单位: Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; Research Centre for Geotechnology, Indonesian Institute of Sciences, Bandung, Indonesia; High-Precision Mass Spectrometry and Environmental Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, Taiwan; School of Earth Sciences, University of Melbourne, Parkville, VIC, Australia; School of Earth Sciences, University of QLD, Brisbane, QLD, Australia; Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States; Institute of Global Environmental Change, Xi'an Jiatong University, Xi'an, China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; Department of Physics, State University of Padang, Padang, Indonesia

Recommended Citation:
Scroxton N.,Gagan M.K.,Dunbar G.B.,et al. Natural attrition and growth frequency variations of stalagmites in southwest Sulawesi over the past 530,000 years[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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