DOI: 10.1016/j.palaeo.2016.04.015
论文题名: High-resolution trace element and stable/radiogenic isotope profiles of late Pleistocene to Holocene speleothems from Dim Cave, SW Turkey
作者: Ünal-Imer E. ; Shulmeister J. ; Zhao J.-X. ; Uysal I.T. ; Feng Y.-X.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 452 起始页码: 68
结束页码: 79
语种: 英语
英文关键词: Dim Cave
; Eastern Mediterranean
; Speleothem geochemistry
; Sr-isotope ratio
; Stable isotope ratio
; SW Turkey
英文摘要: Multiple climate-sensitive trace element/Ca and stable isotope (O and C) profiles derived from Dim Cave speleothems (S-SW Turkey) provide evidence of climatic changes and define a series of palaeohydrological conditions for the period ~10-90 kyr. Dim Cave speleothem Mg/Ca, Sr/Ca, U/Ca, Ba/Ca, and Y/Ca ratios demonstrate similar patterns over glacial-interglacial scales, in agreement with δ18O and δ13C records. Three episodes of more positive moisture balance (71-63 kyr, 51-40 kyr, and 18-10 kyr) were observed based on Y/Ca (and to a lesser extent Zr/Ca), 87Sr/86Sr ratios, calcite micromorphology, and growth rates. Increasing concentrations of Y, Zr (and U) and elevated 87Sr/86Sr ratios are attributed to enhanced levels of terrestrial input during these periods. Correlations between δ13C, δ18O and Mg/Ca during 40-18 kyr (corresponding with the lowest growth rate of ~0.8 mm/kyr), 63-51, and 80-71 kyr (relatively low growth rates), as well as co-varying and enhanced Mg/Ca, Sr/Ca, and to a lesser extent Ba/Ca, ratios point to the prior calcite precipitation, wall rock interaction, and preferential dolomite dissolution over calcite in the host dolomitic limestone during these periods. This relationship suggests that water-rock interactions are maximised during episodes of slower drip rates of water through the karst under drier conditions. Chondrite-normalised rare earth element and yttrium (REY) patterns of the stalagmites reveal seawater signatures closely linked to the dolomitic limestone. Excluding the aragonite formation during ~80-75 kyr, which is an autogenic effect, trace element/Ca ratios appear to respond to millennial scale global cooling periods such as Heinrich events. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68427
Appears in Collections: 过去全球变化的重建
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作者单位: Climate Research Group, School of Geography, Planning and Environmental Management, The University of QueenslandQLD, Australia; Queensland Geothermal Energy Centre of Excellence, The University of QueenslandQLD, Australia; School of Earth Sciences, The University of Queensland, Brisbane, QLD, Australia; Department of Geological Engineering, Hacettepe University, Turkey
Recommended Citation:
Ünal-Imer E.,Shulmeister J.,Zhao J.-X.,et al. High-resolution trace element and stable/radiogenic isotope profiles of late Pleistocene to Holocene speleothems from Dim Cave, SW Turkey[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,452