High-precision U-series dating of corals from Western Australia and implications for the timing and duration of the Last Interglacial

Stirling, Claudine H.; Esat, T. M.; McCulloch, Malcolm T.; Lambeck, Kurt

doi:10.1016/0012-821x(95)00152-3

Cited by 293 publications

(219 citation statements)

References 30 publications

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“…Past sea level estimates from ␣-counted 230 Th dates on raised coral terraces from Barbados supported the Milankovitch hypothesis on the relation between glacier ice volume and insolation (Broecker et al, 1968;Mesolella et al,1969). Later, more precise and accurate thermal ionization mass spectrometry (TIMS) confirmed this result in a variety of locations (Edwards et al, 1987a,b;Gallup et al, 1994;Muhs et al, 1994;Stirling et al, 1995;Szabo et al, 1994). Drill cores of submerged corals that have been precisely dated by 230 Th methods contain our most detailed and continuous record of sea-level since the last glacial maximum (Bard et al, 1993;Bard et al, 1996;Edwards et al, 1993).…”

Section: Introductionmentioning

confidence: 85%

U-Th dating of deep-sea corals

Cheng

Adkins

Edwards

et al. 2000

Geochimica et Cosmochimica Acta

214

162

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Abstract- 230 Th, 232 Th, 234 U and 238 U compositions of several deep-sea solitary corals, mainly the species Desmophyllum cristagalli, were determined by thermal ionization mass spectrometry (TIMS). It is possible to obtain high precision ages on modern pristine corals that have low [ 232 Th] (5 to a few hundred ppt). However, because older deep-sea corals tend to have higher [ 232 Th] compared to surface corals, and the initial 230 Th/ 232 Th ratio is uncertain, older deep-sea corals have larger age uncertainties (Ϯseveral hundred years for samples with a few thousand ppt 232 Th). Therefore, the key hurdle for precise U-Th dating is to remove or account for contaminants which contain elevated 232 Th and associated 230 Th not due to closed system decay within the coral lattice. A modification of the trace metal cleaning methods used for foraminifera and surface corals can significantly reduce this contamination. By counting the visible growth bands and measuring the mean age of a single septum, the extension rate of D. cristagalli was estimated to be between 0.1 and 3.1 mm/year. In a mean sense, bands appear to be precipitated annually, but this estimate has a large uncertainty. If appropriate tracer calibrations can be established, these corals are therefore suitable to record decadal or sub-decadal oceanographic changes over the course of their lifetime. The ␦ 234 U values of all modern samples from different localities and different depths are similar (mean 145.5 Ϯ 2.3‰) and indistinguishable from the data obtained from surface corals. At a precision of about Ϯ2‰, we find no structure in the oceanic profile of ␦ 234 U ratios over the top 2000 m of the water column.

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Section: Introductionmentioning

confidence: 85%

U-Th dating of deep-sea corals

Cheng

Adkins

Edwards

et al. 2000

Geochimica et Cosmochimica Acta

214

162

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“…We model GIA for representative sites for key fossil-coral locations at Barbados (13.116 N,59.542 W), Tahiti (17.567 S, 149.58 W), Western Australia (22.32 S,113.8 E), and the Seychelles (4.67 S, 55.5 E) (e.g., Fairbanks, 1989;Stirling et al, 1995;Bard et al, 1996;Israelson and Wohlfarth, 1999 e as early examples from the extensive literature summarised by Hibbert et al, 2016). Hanish Sill, 42.533 E), is the control point for Red Sea reconstructions, as is Camarinal Sill, Strait of Gibraltar (35.92 N,5.72 W), for Mediterranean Sea reconstructions (Siddall et al, 2003;Grant et al, 2012Grant et al, , 2014Rohling et al, 2014).…”

Section: Glacioisostatic Corrections To Last Interglacial Sea Levelmentioning

confidence: 99%

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Rohling

Hibbert

Williams

et al. 2017

Quaternary Science Reviews

115

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Arctic ice shelf Last Interglacial Glacioisostatic adjustment a b s t r a c t Studies of past glacial cycles yield critical information about climate and sea-level (ice-volume) variability, including the sensitivity of climate to radiative change, and impacts of crustal rebound on sealevel reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms of global volume and distribution of land ice, despite similar temperatures and radiative forcing. Our analysis challenges conventional views of relationships between global ice volume, sea level, seawater oxygen isotope values, and deep-sea temperature, and supports the potential presence of large floating Arctic ice shelves during the PGM. The existence of different glacial 'modes' calls for focussed research on the complex processes behind ice-age development. We present a glacioisostatic assessment to demonstrate how a different PGM ice-sheet configuration might affect sea-level estimates for the last interglacial. Results suggest that this may alter existing last interglacial sea-level estimates, which often use an LGM-like ice configuration, by several metres (likely upward).

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“…(4) There is a broad-scale consensus over the timing and the elevation of the Last Interglacial (MIS 5e) sea-level. During this time period, sea-level was several meters higher than that of today (w4 AE 2 m apsl) and the start of MIS 5e high stand has been dated to w128 ka BP in tectonically stable sites (Chen et al, 1991;Stirling et al, 1995Stirling et al, and, 1998McCulloch and Esat, 2000;Muhs, 2002;Blanchon et al, 2009). Therefore, in tectonically uplifting areas, in order to determine vertical tectonic uplift rates, the elevation and the age of MIS 5e coastlines are used.…”

Section: Dogan Et Al Present Their Esr and U/th Dating Results Of Thmentioning

confidence: 99%

Comment on “MIS 5a and MIS 3 relatively high sea-level stands on the Hatay-Samandağı coast, Eastern Mediterranean, Turkey”. U. Doğan, A. Koçyiğit, B. Varol, İ. Özer, A. Molodkov, E. Zöhra. Quaternary International (2012), 262, 65–79

Bekaroğlu

2012

Quaternary International

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High-precision U-series dating of corals from Western Australia and implications for the timing and duration of the Last Interglacial

Cited by 293 publications

References 30 publications

U-Th dating of deep-sea corals

U-Th dating of deep-sea corals

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Comment on “MIS 5a and MIS 3 relatively high sea-level stands on the Hatay-Samandağı coast, Eastern Mediterranean, Turkey”. U. Doğan, A. Koçyiğit, B. Varol, İ. Özer, A. Molodkov, E. Zöhra. Quaternary International (2012), 262, 65–79

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