High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols

Shen, Chuan‐Chou; Wu, Chung‐Che; Cheng, Hai; Edwards, R. Lawrence; Hsieh, Yu-Te; Gallet, Sylvain; Chang, Ching Chih; Li, Ting-Yong; Lâm, Doãn Đình; Kano, Akihiro; Hori, Masako; Spötl, Christoph

doi:10.1016/j.gca.2012.09.018

Cited by 318 publications

(246 citation statements)

References 72 publications

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“…U and Th were co-precipitated with an Fe-carrier, then separated to form a clean U fraction and a clean Th fraction using an anion exchange resin (Shen et al, 2003). The isotopic compositions of U and Th in the solutions were measured by a Thermo Electron NEPTUNE multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) (Shen et al, 2012). The obtained ages are given as year BP ("Before Present", i.e., before the analyses' dates).…”

Section: Methodsmentioning

confidence: 99%

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Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Demény

Kern

Czuppon

et al. 2017

Quaternary Science Reviews

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Highlights Stable isotope compositions of a last interglacial (LIG) stalagmite, Central Europe  A sequence of climate change events during the LIG for European speleothems  Hydrogen isotope data of inclusion water reveal a major event at about 125 ± 2 ka  Temperature and winter precipitation changes around the Mediterranean at 125 ± 2 ka ABSTRACT Studies on the last interglacial (LIG) can provide information on how our environment behaved in a period of slightly higher global temperatures at about 125 ± 4 ka, even if it is not the best analogue for the Holocene. The available LIG climate proxy records are usually better preserved and can be studied at a higher resolution than those of the preceding interglacials, allowing detailed comparisons. This paper presents complex stable hydrogen, carbon and oxygen isotope records obtained for carbonate (δ 13 Baradla data indicate enhanced aridity and seasonality for a part of GS26, with the relative dominance of summer precipitation and Mediterranean moisture contribution. Following the GS26 event, the effect of long-term global cooling becomes dominant in the Baradla isotope records and leads to glacial inception at about 109 ka.

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Section: Methodsmentioning

confidence: 99%

“…Chemistry was performed in two analytical runs (Shen et al, 2003), instrumental analysis was done on MC-ICP-MS (Shen et al, 2012). Analytical errors are 2s of the mean.…”

mentioning

confidence: 99%

Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Demény

Kern

Czuppon

et al. 2017

Quaternary Science Reviews

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“…The age datum is 1950 CE. For additional information about the applied method, see Edwards et al (1987), Shen et al (2012) and Cheng et al (2013) and references therein. Age-depth modeling was carried out using the StalAge algorithm of Scholz and Hoffmann (2011).…”

Section: Methods and Analytical Proceduresmentioning

confidence: 99%

Paleoclimate in continental northwestern Europe during the Eemian and early Weichselian (125–97 ka): insights from a Belgian speleothem

et al. 2016

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Abstract. The last interglacial serves as an excellent time interval for studying climate dynamics during past warm periods. Speleothems have been successfully used for reconstructing the paleoclimate of last interglacial continental Europe. However, all previously investigated speleothems are restricted to southern Europe or the Alps, leaving large parts of northwestern Europe undocumented. To better understand regional climate changes over the past, a larger spatial coverage of European last interglacial continental records is essential, and speleothems, because of their ability to obtain excellent chronologies, can provide a major contribution. Here, we present new, high-resolution data from a stalagmite (Han-9) obtained from the Han-sur-Lesse Cave in Belgium. Han-9 formed between 125.3 and ∼ 97 ka, with interruptions of growth occurring at 117.3-112.9 and 106.6-103.6 ka. The speleothem was investigated for its growth, morphology and stable isotope (δ 13 C and δ 18 O) composition. The speleothem started growing relatively late within the last interglacial, at 125.3 ka, as other European continental archives suggest that Eemian optimum conditions were already present during that time. It appears that the initiation of Han-9 growth is caused by an increase in moisture availability, linked to wetter conditions around 125.3 ka. The δ 13 C and δ 18 O proxies indicate a period of relatively stable conditions after 125.3 ka; however, at 120 ka the speleothem δ 18 O registered the first signs of regionally changing climate conditions, being a modification of ocean source δ 18 O linked to an increase in ice volume towards the Marine Isotope Stage (MIS) 5e-5d transition. At 117.5 ka, drastic vegetation changes are recorded by Han-9 δ 13 C immediately followed by a cessation of speleothem growth at 117.3 ka, suggesting a transition to significantly dryer conditions. The Han-9 record covering the early Weichselian displays larger amplitudes in both isotope proxies and changes in stalagmite morphology, evidencing increased variability compared to the Eemian. Stadials that appear to be analogous to those in Greenland are recognized in Han-9, and the chronology is consistent with other European (speleothem) records. Greenland Stadial 25 is reflected as a cold/dry period within Han-9 stable isotope proxies, and the second interruption in speleothem growth occurs simultaneously with Greenland Stadial 24.

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“…Chemical separation and multi-collector inductively coupled mass spectrometric (MC-ICPMS) measurement of U and Th isotopic ratios were undertaken at the University of Minnesota using procedures similar to those described in Shen et al (2012). Samples were pre-treated prior to chemical preparation in order to remove surface impurities from the CCC coarse aggregates.…”

Section: Methodsmentioning

confidence: 99%

Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates

Luetscher

Borreguero²,

Moseley

et al. 2013

The Cryosphere

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Abstract. Coarse crystalline cryogenic cave carbonates (CCC coarse ) dated to the last glacial period are common in central European caves and provide convincing evidence of palaeo-permafrost during this time. Little is known, however, about the exact nature of the environment in which CCC coarse formed as no modern analogue setting is known. Here, we report the first findings of sub-recent, albeit inactive, CCC coarse from a cave of the Western Alps which is located in the present-day permafrost zone. The globular shape and the presence of ubiquitous euhedral crystal terminations are comparable to previously reported aggregates from the last glacial period and strongly suggest that these aggregates formed subaqueously in pools lacking agitation. Furthermore, stable isotope values of mm-sized spheroids point to calcite precipitation in a closed system with respect to CO 2 , strongly supporting the hypothesis of a cryogenic origin associated with the freezing of water ponds. U-series analyses revealed three clusters of late Holocene calcite precipitation intervals between 2129 and 751 a b2k. These ages correlate with known periods of elevated summer temperatures, suggesting that warming and thawing of the frozen catchment above the cave allowed water infiltration into the karst system. The growth of CCC coarse resulted from the re-freezing of this water in the still cold karst cavities.

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High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols

Cited by 318 publications

References 72 publications

Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Paleoclimate in continental northwestern Europe during the Eemian and early Weichselian (125–97 ka): insights from a Belgian speleothem

Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates

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High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols

Cited by 318 publications

References 72 publications

Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Stable isotope compositions of speleothems from the last interglacial – Spatial patterns of climate fluctuations in Europe

Paleoclimate in continental northwestern Europe during the Eemian and early Weichselian (125–97 ka): insights from a Belgian speleothem

Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates

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Paleoclimate in continental northwestern Europe during the Eemian and early Weichselian (125–97 ka): insights from a Belgian speleothem