Uranium Lead Dating Pdf - Cincinnati
Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest and most refined of the radiometric dating schemes. It can be used to date rocks that formed. created by the disintegration of radium, coming from uranium contained in the earth's crust well-known accumulation method, but with an accumulation chamber (cylindrical metal .. Note technique SEGR-LEADS, IPSN, France. Main · Videos; Uranium lead dating pdf Dilbert är ordförande yo verkställande direktör för the flavor for flavor flavor. Are you wearing to flavor this the rock.
The numbers of Faraday cups are 2, 3, 4, 5, 6, 7 and 8, the ion counter position corresponding to the cup 5. The lead-uranium fraction mixed with the silica gel-phosphoric acid solution is loaded under HEPA laminar flow on a single outgassed rhenium filament.
Uranium–lead dating - Wikipedia
The filament is heated slowly from 0. Different configurations of Faraday cups and ion counter are utilized for the lead analysis with different spikes and different signal levels. In case of UPb tracer application, the analysis is carried out in static mode. The signals of massesand are registered on the Faraday cups 4, 3 and 2, while the signal of mass is received on the ion counter.
Uranium Lead Dating Pdf995
In case of using UPb tracer, the configuration of this 7-collector mass-spectrometer does not permit the analysis of all necessary lead mass in a static mode, because only three cups adjacent to ion counter IC are available in one side. Therefore, the following dynamic mode is applied: The total time required for acquisition of 5 blocks of data is about 30 min. The mass fractionation correction for lead is 0. The U is analyzed as UO2 just after lead measurement from the same filament, by measurement of masses: Depending on signal level, UO2 is analyzed in static mode on Faraday cups 6 for and 5 for or peak jumping mode on ion counter.
The time for collection of 3 blocks is 15 min. This program calculates the measured isotope ratios and their 2 sigma errors. After that, the data set is processed by PbDatprogram version 1. Finally, the data are processed with Isoplot for Excel program version 2. Errors on final results are quoted at a 2s level. Therefore, for most zircon samples, the correction of measured lead on contamination by common lead by Stacey and Kramers model gives satisfactory results.
The best precision of U-Pb age determination achieved in the laboratory is 1 Ma for standard zircons and for some other zircons, which have not been included in the paper as, for example, for zircons from Mid Atlantic ridge.
The international standard is a concordant zircon with an age of Three sets of analyses of this standard were carried out using three different U-Pb spikes. The results are displayed in Table I. The chemical procedures include spiking after digestion and aliquoting. U-Pb results from five fragments yielded an upper intercept age of The second test was made with UPb ''B'' spike. The chemical procedures include spiking before digestion.
The zircon grains were abraded. The weights of analyzed samples were slightly lower than those of the first test. All the analytical points are concordant and an U-Pb Concordia age of Zircon fragments were also abraded and spiking was done before digestion.
The U-Pb Discordia age calculated from four zircon fragments is The larger scattering of data ellipses relatively to those on figure 2 is possibly caused by not ideal calibration of ion counter gain, or by too strong washing of zircon fragments with HNO3.
The ages calculated from all three sets of standard are excellent agreement within error limit with the standard value previously published Wiedenbeck et al.
Also, it is necessary to underline the variations in concentrations of U ppm and Pb ppmwhich slightly exceed the interval yielded by Wiedenbecket al.
The first standard has high U and Pb concentrations, while the second has low concentrations of these elements. The values of concentration for these standards were determined by analytical procedures described above for whole rock samples, and compared with values published by Govindaraju see Table II.
The mass of standards used for analyses was about mg. The obtained values are similar to those of Govindarajuwhich permit to conclude that the installed procedures are sufficient for a precise determination of U and Pb contents in whole rock samples. This specimen was collected during regional geological survey of field seasons.
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