ABSOLUTE AGE DETERMINATION OF ARCHAEOLOGICAL SITES BY URANIUM SERIES DATING OF TRAVERTINES

Archaeometry ◽  
1980 ◽  
Vol 22 (1) ◽  
pp. 3-24 ◽  
Author(s):  
H. P. SCHWARCZ
Keyword(s):  
Age Determination ◽  
Archaeological Sites ◽  
Uranium Series ◽  
Uranium Series Dating ◽  
Absolute Age

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>

scholarly journals Dynamical Age Determination of Open Clusters

1980 ◽  
Vol 85 ◽  
pp. 221-222
Author(s):  
M. Buchholz ◽  
Th. Schmidt-Kaler
Keyword(s):  
Age Determination ◽  
Dynamical Theory ◽  
Distribution Functions ◽  
Open Clusters ◽  
Kolmogorov Smirnov ◽  
The Difference ◽  
Absolute Age ◽  
Image Position ◽  
Smirnov Test

The radial mass distribution (obtained by counting stars in strips) of the real cluster is compared successively to the distribution functions of a simulated cluster of 100 stars, each of which corresponds to a certain dynamical age, Tdyn, The value of Tdyn, belonging to the function most similar to the observed one is taken to be the dynamical age of the cluster. The radius is given in units of R1/2 (sphere containing half of the total mass); this unit is nearly time-independent. The difference between the distribution functions is measured by the maximum Δmax of the Kolmogorov-Smirnov test which is free from assumptions on the form of the distributions. The minimum in the plot Δmax vs Tdyn, indicates the age of the cluster. It is then converted into an absolute age, Tabs (in years), by The error due to the dynamical theory (limited number of distribution functions, etc.) is estimated at 12%, the error due to the uncertainty of diameter and mass of the cluster is about 30%. Unreliable results were obtained in case of strongly inhomogeneous reddening of the cluster. As an example, the plot of the test values for NGC 457 is given in Figure 1.

Uranium-series dating and the origin of modern man

1992 ◽  
Vol 337 (1280) ◽  
pp. 131-137 ◽  
Keyword(s):  
High Precision ◽  
Isotope Ratios ◽  
Mass Spectrometric ◽  
Archaeological Sites ◽  
Optimal Method ◽  
Uranium Series ◽  
Uranium Series Dating

Uranium-series dating is based on measurement of the radioactivity of short-lived daughter isotopes of uranium formed in samples which initially contained only the parent uranium. Materials suitable for U-series dating are found in many prehistoric archaeological sites, and include stalagmitic layers (flowstones), and spring-deposited travertines. Some marls and calcretes are also datable using isochron methods, whereas dates on molluscan shells, bones and teeth are less reliable. Ages obtained using alpha counting to determine isotope ratios have errors greater than 5%, and can range from 1 to 350 ka. Mass spectrometric methods slightly increase the range (0.1-500 ka) but greatly decrease the error to less than 1%, making this the optimal method for high-precision dating of the origin of modern man.

Wolverine in Northern England at About 83,000 yr B.P.: Faunal Evidence for Climatic Change during Isotope Stage 5

1985 ◽  
Vol 24 (1) ◽  
pp. 73-86 ◽  
Author(s):  
Antony J. Sutcliffe ◽  
Thomas C. Lord ◽  
Russell S. Harmon ◽  
Miro Ivanovich ◽  
Angela Rae ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Oxygen Isotope ◽  
Climatic Change ◽  
Faunal Assemblage ◽  
Oxygen Isotope Stage ◽  
Uranium Series ◽  
Cave Sediments ◽  
Uranium Series Dating ◽  
Absolute Age ◽  
Carbonate Deposits

Cave sediments from Stump Cross Cave in northern England contain Pleistocene mammal remains. Uranium-series dating of calcium carbonate deposits closely associated with the fossiliferous horizons has established an absolute age of 83,000 ± 6000 yr B.P. for a faunal assemblage largely comprised of wolverines (Gulo gulo). This date lies firmly within the younger portion of oxygen-isotope stage 5. The occurrence of wolverines in the vicinity of Stump Cross Cave at ca. 83,000 yr B.P. indicates a significant climatic deterioration from ca. 120,000 yr B.P., when an Ipswichian interglacial fauna with hippopotamus was present in this part of northern England.

ABSOLUTE-AGE DETERMINATION OF SEDIMENTARY ROCKS BY GLAUCONITES

1961 ◽  
Vol 3 (12) ◽  
pp. 1159-1167
Author(s):  
N. I. Polevaya ◽  
G. A. Murina ◽  
G. A. Kazakov
Keyword(s):  
Sedimentary Rocks ◽  
Age Determination ◽  
Absolute Age

scholarly journals Bomb dating and age determination of skates (family Rajidae) off the eastern coast of Canada

2009 ◽  
Vol 66 (3) ◽  
pp. 546-560 ◽  
Author(s):  
Romney P. McPhie ◽  
Steven E. Campana
Keyword(s):  
Growth Models ◽  
Age Determination ◽  
Age And Growth ◽  
Eastern Coast ◽  
Vertebral Centra ◽  
A Value ◽  
Bomb Radiocarbon ◽  
Absolute Age ◽  
Two Parameter

Abstract McPhie, R. P., and Campana, S. E. 2009. Bomb dating and age determination of skates (family Rajidae) off the eastern coast of Canada. – ICES Journal of Marine Science, 66: 546–560. Recent declines in abundance of skates off the eastern coast of Canada have heightened the need for validated age and growth estimates in the region. In all, 502 winter (Leucoraja ocellata), little (Leucoraja erinacea), thorny (Amblyraja radiata), and smooth (Malacoraja senta) skate vertebral centra collected seasonally between 1999 and 2004 were sectioned using a mass processing method, then used to reconstruct growth in each species. Bomb radiocarbon (Δ14C) analysis was used to provide evidence of annual band-pair deposition in thorny skates. Estimates of L∞ from traditional von Bertalanffy growth models (VBGM) ranged from 60.6 cm (little skate) to 89.7 cm (thorny skate), and K estimates from 0.07 (thorny skate) to 0.19 (little skate). A modified two-parameter VBGM (Lmax = 94.1 cm) fitted to winter skate length-at-age data yielded a value of K of 0.15. Maximum observed ages ranged from 12 (little skate) to 19 years in both winter and thorny skates. The year-specific incorporation of Δ14C milled from thorny and winter skate vertebral sections closely resembled shark-derived reference chronology values from the Northwest Atlantic. Pre-bomb Δ14C in a thorny skate collected in 1988 and aged at 23 years appeared to validate age interpretations and suggested that thorny skate reach an absolute age of at least 28 years, the oldest validated age reported for any species of batoid.

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
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