Dating of impure carbonates – Utilizing laser ablation MC-ICPMS to reconstruct initial 230Th/232Th ratios

2020 ◽  
Author(s):  
Julius Förstel ◽  
Sophie Warken ◽  
Andrea Schröder-Ritzrau ◽  
Norbert Frank
Keyword(s):  
Laser Ablation ◽  
Correction Term ◽  
Age Determination ◽  
Systematic Errors ◽  
Individual Measurement ◽  
Uranium Series ◽  
Heterogeneous Samples ◽  
Uranium Series Dating ◽  
Measurement Laser

<p><span>Uranium series dating is a valuable and well-established tool for age determination of carbonates in paleoclimatology. However, detrital contamination can alter results. A correctional term is commonly used to account for additional Th introduced into the sample material as detritus. </span><span>This correction requires to make assumptions about the initial </span><sup><span>230</span></sup><span>Th/</span><sup><span>232</span></sup><span>Th ratio of the detrital material, since it is not possible to extract it from an individual measurement. Laser ablation multi collector ICPMS equipped with multiple ion counting detectors offers the possibility to use an isochrone technique to extract the initial </span><sup><span>230</span></sup><span>Th/</span><sup><span>232</span></sup><span>Th value from heterogeneous samples with a high detrital content. This decreases systematic errors and uncertainties introduced by the detrital correction term and therefore improves the possibility of dating impure carbonates.</span></p>

Uranium-series dating of corals in situ using laser-ablation MC-ICPMS

2005 ◽  
Vol 240 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Emma-Kate Potter ◽  
Claudine H. Stirling ◽  
Uwe H. Wiechert ◽  
Alex N. Halliday ◽  
Christoph Spötl
Keyword(s):  
Laser Ablation ◽  
Uranium Series ◽  
Uranium Series Dating

U–Pb age determination of schorlomite garnet by laser ablation inductively coupled plasma mass spectrometry

2018 ◽  
Vol 33 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Yue-Heng Yang ◽  
Fu-Yuan Wu ◽  
Jin-Hui Yang ◽  
Roger H. Mitchell ◽  
Zi-Fu Zhao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Age Determination ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Alkaline Complexes

We report the first U–Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U–Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundances and negligible common Pb content.

Determination of the evolutionary mode of Austrian alpine cave bears by uranium series dating

1994 ◽  
Vol 7 (2) ◽  
pp. 97-104 ◽  
Author(s):  
E. Leitner‐Wild ◽  
G. Rabeder ◽  
I. Steffan
Keyword(s):  
Uranium Series ◽  
Uranium Series Dating ◽  
Evolutionary Mode

Statistics and parallaxes

1978 ◽  
Vol 48 ◽  
pp. 7-29
Author(s):  
T. E. Lutz
Keyword(s):  
Experimental Design ◽  
Statistical Methods ◽  
Review Paper ◽  
Systematic Errors ◽  
Past Experience ◽  
Random Errors ◽  
Trigonometric Parallaxes ◽  
Systematic And Random Errors

This review paper deals with the use of statistical methods to evaluate systematic and random errors associated with trigonometric parallaxes. First, systematic errors which arise when using trigonometric parallaxes to calibrate luminosity systems are discussed. Next, determination of the external errors of parallax measurement are reviewed. Observatory corrections are discussed. Schilt’s point, that as the causes of these systematic differences between observatories are not known the computed corrections can not be applied appropriately, is emphasized. However, modern parallax work is sufficiently accurate that it is necessary to determine observatory corrections if full use is to be made of the potential precision of the data. To this end, it is suggested that a prior experimental design is required. Past experience has shown that accidental overlap of observing programs will not suffice to determine observatory corrections which are meaningful.

Radiometric dating of hillslope calcrete in the Negev Desert, Israel

2008 ◽  
Vol 104 (11/12) ◽  
Author(s):  
J.C. Vogel ◽  
M.A. Geyh
Keyword(s):  
Open System ◽  
Negev Desert ◽  
Radiometric Dating ◽  
Jordan Valley ◽  
Partial Recrystallization ◽  
Uranium Series ◽  
Uranium Series Dating

The radiometric dating of calcrete is often problematical because impurities and open system conditions affect the apparent ages obtained. By applying both radiocarbon and uranium-series dating to calcrete in colluvium, it is shown that such conditions can be identified. In correlation with the stratigraphy, it is found that partial recrystallization severely decreases the radiocarbon ages of the upslope and shallower samples further down, whereas incorporation of limestone fragments from bedrock significantly increases the apparent ages of some of the uranium-series samples. It is concluded that the hillslope calcrete at the study site near Sede Beker in the Negev Desert, Israel, mainly developed shortly after 40 kyr ago, at a time when the Jordan Valley was being inundated to form the fossil Lake Lisan. Since their formation would have required higher rainfall than today, the results provide further evidence that the whole region was experiencing an increase in precipitation.

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