Table 2.

Analytical data and calculated ages for the monazite samples VU 602A and EL 9/2

AnalysisIsotopic ratiosElement concentrations (ppm)Calculated ages (Ma)
207Pb/235U±1σ (%)206Pb/238U±1σ (%)Rho207Pb/206Pb±1σ (%)206Pb/204PbUThPb207Pb/235U±1σ206Pb/238U±1σ207Pb/206Pb±1σ
Sample VU 602A; SIMS data
10.39242.16320.05431.65540.770.05241.392549583237404698233366341630231
20.39452.17680.05461.71890.790.05241.335752033068348047253386343630330
30.39832.36910.05401.88390.800.05351.436538123881524068233407339635232
40.38872.34560.05411.81240.770.05211.489031702937208098553337340628834
50.40142.15240.05421.69070.790.05371.332050993438526478553436340636030
60.39622.21820.05451.76570.800.05271.342651493419181518003396342631730
70.39542.27920.05441.57440.690.05271.6480471936133438710043387342531537
80.40052.14380.05481.70550.800.05301.298974413821531336243426344632829
90.40642.28430.05491.75280.770.05361.464856902913395428413467345635633
100.40722.27630.05461.83180.800.05411.351384823738503855163477343637530
110.40342.13100.05381.70740.800.05441.275056903653244697273446338638628
120.38333.28480.05332.64440.810.05221.948630112869345507813299334929444
130.39432.20920.05381.54630.700.05321.5778479236335353510183376338533635
140.39822.58620.05431.85990.720.05321.797038613265375048743408341633740
150.39822.23410.05461.70210.760.05291.4470770740744796747083406342632633
160.40522.47420.05501.63210.660.05341.859664593043399117543457345534642
170.40142.17840.05481.73610.800.05311.3159489329833638138063436344633430
180.39252.33200.05501.75560.750.05181.5349413632567069767803367345627535
AnalysisIsotopic ratiosElement concentrations (ppm)Calculated ages (Ma)
207Pb/235U±2σ (%)206Pb/238U±2σ (%)Rho207Pb/206Pb±2σ (%)206Pb/204PbUThPb207Pb/235U±2σ206Pb/238U±2σ207Pb/206Pb±2σ
Sample EL 9/2; ID-TIMS data
10.39450.00470.05370.00020.490.05330.000646138710110171337.63.4337.31.0340.024.3
20.39160.00390.05360.00010.460.05300.000538363837761603335.52.8336.70.9327.420.3
30.38850.00940.05360.00020.350.05260.001215226910521176333.36.8336.71.1309.751.9
40.38950.00420.05340.00020.470.05290.000537949924048387334.03.0335.21.0325.821.8
50.38840.01660.05350.00150.690.05260.001631973737123600333.212.1336.19.1313.169.4
60.37830.00290.05150.00010.390.05330.000444749124582365325.82.2323.80.7340.316.2

Analysis shown in italics was not used for the calculation of the age.