Precise microsampling of poorly laminated speleothems for U-series dating

Drysdale, Russell N.; Paul, Bence; Hellström, John; Couchoud, Isabelle; Greig, Alan; Bajo, Petra; Zanchetta, Giovanni; Isola, Ilaria; Spötl, Christoph; Baneschi, Ilaria; Regattieri, Eleonora; Woodhead, Jon

doi:10.1016/j.quageo.2012.06.009

Cited by 48 publications

(40 citation statements)

References 25 publications

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“…The U-Th analysis at Melbourne University followed the procedure set out in Hellstrom (2003), modified as described in Drysdale et al (2012). Samples were extracted using a 1 mm drill bit following the growth layering.…”

Section: U-series Dating Methodsmentioning

confidence: 99%

Gypsum caves as indicators of climate-driven river incision and aggradation in a rapidly uplifting region

Columbu¹,

Waele²,

Forti³

et al. 2015

Geology

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Detailed geomorphological analysis has revealed that subhorizontal gypsum caves in the Northern Apennines (Italy) cut across bedding planes. These cave levels formed during cold periods with stable river beds, and are coeval with fluvial terraces of rivers that flow perpendicular to the strike of bedding in gypsum monoclines. When rivers entrench, renewed cave formation occurs very rapidly, resulting in the formation of a lower level. River aggradation causes cave alluviation and upward dissolution (paragenesis) in passages nearest to the river beds. The U-Th dating of calcite speleothems provides a minimum age for the formation of the cave passage in which they grew, which in turn provides age control on cave levels. The ages of all speleothems coincide with warmer and wetter periods when CO 2 availability in the soils covering these gypsum areas was greater. This climate-driven speleogenetic model of epigenic gypsum caves in moderately to rapidly uplifting areas in temperate regions might be generally applicable to karst systems in different geological and climatic conditions.

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Section: U-series Dating Methodsmentioning

confidence: 99%

Gypsum caves as indicators of climate-driven river incision and aggradation in a rapidly uplifting region

Columbu¹,

Waele²,

Forti³

et al. 2015

Geology

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“…U-Th Geochronology U-Th dating was undertaken at The University of Melbourne following Hellstrom (2003) and Drysdale et al (2012). U-Th Geochronology U-Th dating was undertaken at The University of Melbourne following Hellstrom (2003) and Drysdale et al (2012).…”

Section: 1029/2018gl080832mentioning

confidence: 99%

“…Speleothem calcite samples of up to 200 mg were dissolved in concentrated HNO 3 , spiked with a mixed 236 U-233 U-229 Th tracer and equilibrated on a hotplate overnight. Age-depth model envelopes were constructed using the Monte Carlo finite positive growth rate model (Scholz et al, 2012) of Drysdale et al (2012) and Hendy et al (2012) with sections between hiatuses treated independently and extrapolated to hiatus depths ( Figure 1). Samples were then introduced to a Nu Instruments Plasma multicollector inductivelycoupled plasma mass spectrometer in dilute HNO 3 with trace HF via a Nu Instruments DSN desolvator with Teflon nebulizer.…”

Section: 1029/2018gl080832mentioning

confidence: 99%

“…Geophysical Research Letters 2.2. U-Th Geochronology U-Th dating was undertaken at The University of Melbourne following Hellstrom (2003) and Drysdale et al (2012). Speleothem calcite samples of up to 200 mg were dissolved in concentrated HNO 3 , spiked with a mixed 236 U-233 U-229 Th tracer and equilibrated on a hotplate overnight.…”

Section: 1029/2018gl080832mentioning

confidence: 99%

“…All samples from both stalagmites had corrected ages calculated using this value and its uncertainty, equation 1 of Hellstrom (2006) and the 234 U and 230 Th halflives of Cheng et al (2013). Age-depth model envelopes were constructed using the Monte Carlo finite positive growth rate model (Scholz et al, 2012) of Drysdale et al (2012) and Hendy et al (2012) with sections between hiatuses treated independently and extrapolated to hiatus depths (Figure 1).…”

Section: 1029/2018gl080832mentioning

confidence: 99%

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Vegetation and Climate Change in Southwestern Australia During the Last Glacial Maximum

Sniderman

Hellström

Woodhead

et al. 2019

Geophysical Research Letters

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The nature and duration of the Last Glacial Maximum (LGM) in Australia are poorly understood, with little regional agreement on the timing and direction of LGM climate changes. One reason for this is that Australian Late Pleistocene terrestrial sediments typically are both sparse and inorganic, inhibiting the development of detailed radiocarbon chronologies. To address this problem, we extracted fossil pollen from radiometrically dated stalagmites collected in southwest Western Australia. Our pollen record, supported by 30 U‐Th dates, reveals the vegetation response to Late Pleistocene climates between ~34 and 14 ka, through the body of the LGM. Before ~28 ka, sclerophyll forests were more open than today, but at ~28 ka forest cover was essentially eliminated, and treeless conditions were maintained until progressive reforestation at ~17.5 ka. This ~10‐ka‐long full glacial episode correlates with other mid‐high latitude Southern Hemisphere records, suggesting that LGM environmental changes were closely coordinated across the hemisphere.

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Late quaternary speleogenesis and landscape evolution in the northern Apennine evaporite areas

Columbu

Chiarini

Waele

et al. 2017

Earth Surf Processes Landf

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Gypsum beds host the majority of the caves in the north‐eastern flank of the Apennines, in the Emilia Romagna region (Italy). More than six hundred of these caves have been surveyed, including the longest known epigenic gypsum cave systems in the world (Spipola‐Acquafredda, ~11 km). Although this area has been intensively studied from a geological point of view, the age of the caves has never been investigated in detail. The rapid dissolution of gypsum and uplift history of the area have led to the long‐held view that speleogenesis commenced only during the last 130 000 years. Epigenic caves only form when the surface drainage system efficiently conveys water into the underground. In the study area, this was achieved after the dismantling of most of the impervious sediments covering the gypsum and the development of protovalleys and sinkholes. The time necessary for these processes can by constrained by understanding when caves were first formed. The minimum age of karst voids can be indirectly estimated by dating the infilling sediments. U–Th dating of carbonate speleothems growing in gypsum caves has been applied to 20 samples from 14 different caves from the Spipola‐Acquafredda, Monte Tondo‐Re Tiberio, Stella‐Rio Basino, Monte Mauro, and Castelnuovo systems. The results show that: (i) caves have been forming since at least ~600 kyr ago; (ii) the peak of speleogenesis was reached during relatively cold climate stages, when rivers formed terraces at the surface and aggradation caused paragenesis in the stable cave levels; (iii) ~200 000 years were necessary for the dismantling of most of the sediments covering the karstifiable gypsum and the development of a surface mature drainage network. Besides providing a significant contribution to the understanding of evaporite karst evolution in the Apennines, this study refines our knowledge on the timescale of geomorphological processes in a region affected by rapid uplifting. Copyright © 2016 John Wiley & Sons, Ltd.

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Precise microsampling of poorly laminated speleothems for U-series dating

Cited by 48 publications

References 25 publications

Gypsum caves as indicators of climate-driven river incision and aggradation in a rapidly uplifting region

Gypsum caves as indicators of climate-driven river incision and aggradation in a rapidly uplifting region

Vegetation and Climate Change in Southwestern Australia During the Last Glacial Maximum

Late quaternary speleogenesis and landscape evolution in the northern Apennine evaporite areas

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