230Th/U-dating of fossil corals and speleothems

Scholz, Denis; Hoffmann, Dirk L.

doi:10.3285/eg.57.1-2.3

Cited by 52 publications

(37 citation statements)

References 92 publications

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“…Ten MC-ICPMS measurements were performed using a ThermoFinnigan Neptune MC-ICPMS at the Bristol Isotope Group, and twelve analyses were performed on a Finnigan MAT 262 RPQ TIMS at the Heidelberg Academy of Sciences. The key difference between both methods is the transfer efficiency of isotopes, which is 1% with TIMS, but ∼1% with MC-ICP-MS [2]. For young samples with low uranium content, the MC-ICPMS technique thus enables both a higher precision of 230 Th/U-dating and to use smaller sample sizes.…”

Section: Location Sample and Methodsmentioning

confidence: 99%

“…Speleothems are important archives for high resolution climate reconstructions and can be accurately dated by U-series disequilibrium dating methods [1]. The two most precise analytical techniques for the determination of U and Th isotope ratios are multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS) with precisions between per mill and percent, depending on the U content and the age of the sample [2]. Applicability of 230 Th/U-dating on speleothems is based on the prerequisite that no initial 230 Th (i.e., not produced by in situ decay of 234 U and 238 U) is incorporated when the CaCO 3 forms and that the crystal remains a closed system after deposition [3].…”

Section: Introductionmentioning

confidence: 99%

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²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba

Fensterer¹,

Hoffmann²,

Mangini³

et al. 2010

IOP Conf. Ser.: Earth Environ. Sci.

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We present 22 U-series ages for a stalagmite from northwestern Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ∼1400 a. Low uranium content of the sample and thus, extremely low 230 Th concentrations limit the precision and accuracy of 230 Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232 Th content along the growth axis with some sections significantly affected by initial 230 Th from a detrital phase. An a-priori bulk earth ratio for (238 U/ 232 Th) cannot be used to accurately account for this initial 230 Th. Using an age model based on the 230 Th/U ages determined on samples with low or negligible 232 Th concentration, we find that the (238 U/ 232 Th) activity ratio of the detrital phase is an order of magnitude larger than the bulk earth value, indicating the importance of an accurately determined correction factor.

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Section: Location Sample and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba

Fensterer¹,

Hoffmann²,

Mangini³

et al. 2010

IOP Conf. Ser.: Earth Environ. Sci.

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show abstract

“…A major advantage of speleothems is that they can be dated very precisely by U-series disequilibrium methods [57][58][59], which allows dating back to ca 500-600 ka. This is an advantage over other archives such as sediment cores, where the chronology is based on 14 C-dating (and, therefore, only extends to about 50 ka) or on the calibration of individual events such as tephra layers occurring in different records via "wiggle matching" [60].…”

Section: Important Aspects To Consider When Interpreting Speleothem Rmentioning

confidence: 99%

SISAL: Bringing Added Value to Speleothem Research

Comas-Bru

Harrison

2019

Quaternary

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Isotopic records from speleothems are an important source of information about past climates and, given the increase in the number of isotope-enabled climate models, are likely to become an important tool for climate model evaluation. SISAL (Speleothem Isotopes Synthesis and Analysis) have created a global database of isotopic records from speleothems in order to facilitate regional analyses and data-model comparison. The papers in this Special Issue showcase the use of the database for regional analyses. In this paper, we discuss some of the important issues underpinning the use of speleothems and how the existence of this database assists palaeoclimate research. We also highlight some of the lessons learned in the creation of the SISAL database and outline potential research going forward.

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“…230 Th/U age determinations are preferentially done now by TIMS and MC-ICP-MS. Details are given by SCHOLZ & HOFFMANN (2008). Radiometric measurements of the ARs require at least ten times more material and are less precise by one order of magnitude.…”

Section: Sampling Analysis and Isotope Ratio Determinationmentioning

confidence: 99%

230Th/U-dating of intergarcial and interstadial fen peat and lignite: Potential limits

Geyh¹

2008

E&G Quaternary Sci. J.

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Abstract. The state-of-the-art and potential of the 230Th/U disequilibrium method are discussed for the dating of fen peat and lignite. Recommendations are given for the collection of suitable samples. The numerous interfering factors in 230Th/U dating of fen peat show that a rigorous examination of the reliability of the measured data sets is required if reliable 230Th/U ages are to be obtained. The accuracy of such 230Th/U ages allows a reliable correlation of interglacial and interstadial deposits to the warm periods documented in the SPECMAP timescale but does not yet allow detailed temporal resolution.

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230Th/U-dating of fossil corals and speleothems

Abstract: Abstract. Both marine and terrestrial carbonates can be precisely dated by U-series disequilibrium methods in the age range

Cited by 52 publications

References 92 publications

²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba

²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba

SISAL: Bringing Added Value to Speleothem Research

230Th/U-dating of intergarcial and interstadial fen peat and lignite: Potential limits

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230Th/U-dating of fossil corals and speleothems

Abstract: Abstract. Both marine and terrestrial carbonates can be precisely dated by U-series disequilibrium methods in the age range

Cited by 52 publications

References 92 publications

230Th/U-dating of a late Holocene low uranium speleothem from Cuba

230Th/U-dating of a late Holocene low uranium speleothem from Cuba

SISAL: Bringing Added Value to Speleothem Research

230Th/U-dating of intergarcial and interstadial fen peat and lignite: Potential limits

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²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba

²³⁰Th/U-dating of a late Holocene low uranium speleothem from Cuba