The Geological
Timescale Versus Radiometric Dating
By
Paul Nethercott
October 2014
The Triassic Period
208 To 254 Million Years Ago
1. Using The U-Pb System,
Geochimica et Cosmochimica Acta, Volume 62, Number 16, Pages 2823-2835, 1998
|
Pb207/Pb206 |
Pb207/Pb206 |
Pb207/Pb206 |
Pb207/Pb206 |
|
4,175 |
3,491 |
3,401 |
3,385 |
|
4,124 |
3,486 |
3,401 |
3,385 |
|
4,118 |
3,470 |
3,401 |
3,380 |
|
4,092 |
3,455 |
3,401 |
3,380 |
|
4,079 |
3,449 |
3,396 |
3,374 |
|
3,550 |
3,444 |
3,396 |
3,368 |
|
3,546 |
3,439 |
3,391 |
3,368 |
|
3,516 |
3,439 |
3,391 |
3,346 |
|
3,511 |
3,434 |
3,385 |
3,323 |
|
3,491 |
3,401 |
3,385 |
3,318 |
2. Uranium-Thorium-Lead Dating,
Mereoritics And Planetary Science, 2000, Volume 35, Pages 341 - 346
|
Sample |
Pb206/U238 |
Pb207/Pb206 |
|
SHR04.1 |
7,189 |
5,071 |
|
SHRO5.1 |
8,076 |
5,114 |
|
SHR06.1 |
9,373 |
4,900 |
|
SHR13.1 |
5,508 |
5,051 |
|
SHRI5.1 |
5,855 |
4,979 |
|
SHR16.1 |
7,677 |
5,039 |
|
SHR19.1 |
8,589 |
4,959 |
|
SHR21.1 |
7,417 |
4,994 |
|
SHR26.1 |
6,110 |
5,123 |
|
SHR26.2 |
6,614 |
4,976 |
|
SHR27.1 |
11,174 |
5,036 |
|
SHR28.1 |
10,490 |
4,945 |
|
SHR29.1 |
9,522 |
4,969 |
3. Uranium And Lead Gain,
Earth And Planetary Science Letters, 1974, Volume 21, Pages 389-399
|
206Pb/238U |
207Pb/235U |
207Pb/206Pb |
|
229 |
247 |
416 |
|
229 |
255 |
510 |
|
555 |
153 |
1,394 |
|
550 |
149 |
1,400 |
|
516 |
195 |
1,472 |
|
525 |
139 |
1,458 |
|
640 |
877 |
1,533 |
|
611 |
816 |
1,425 |
|
717 |
952 |
1,545 |
|
941 |
1,201 |
1,707 |
|
825 |
1,068 |
1,605 |
|
644 |
811 |
1,303 |
|
676 |
850 |
1,338 |
|
710 |
865 |
1,285 |
|
724 |
896 |
1,349 |
|
861 |
1,120 |
1,651 |
|
808 |
1,066 |
1,639 |
|
1,051 |
1,327 |
1,805 |
4. Complete Pb/U Analysis,
Earth and Planetary Science Letters, Volume 107 (1991), Pages 618-624
|
Pb207/Pb206 |
238U/206Pb |
|
1773 |
5 |
|
1951 |
5 |
|
2046 |
5 |
|
638 |
3 |
|
1138 |
3 |
|
1373 |
4 |
|
1162 |
3 |
|
1629 |
5 |
|
974 |
2 |
|
1273 |
3 |
5. Sr, Nd And Pb Isotope Evidence,
Contributions to Mineralogy and Petrology, Volume 114, 1993, Pages 171 - 188
|
207Pb/206Pb |
207Pb/206Pb |
|
5,061 |
5,009 |
|
5,048 |
5,002 |
|
5,044 |
5,002 |
|
5,036 |
4,999 |
|
5,032 |
4,999 |
|
5,028 |
4,991 |
|
5,023 |
4,989 |
|
5,022 |
4,980 |
|
5,020 |
4,978 |
|
5,016 |
4,970 |
|
5,011 |
4,930 |
6. New Aspects Of Dating Eclogites,
Geochimica et Cosmochimica Acta, 1992, Volume 56, Pages 347-368
|
207Pb/206Pb |
207Pb/206Pb |
|
5,066 |
4,999 |
|
5,065 |
4,999 |
|
5,055 |
4,998 |
|
5,053 |
4,995 |
|
5,049 |
4,994 |
|
5,047 |
4,994 |
|
5,045 |
4,993 |
|
5,035 |
4,991 |
|
5,006 |
4,990 |
|
5,002 |
4,990 |
|
5,002 |
4,987 |
7. Os, Pb, and Nd Isotope Geochemistry,
Geochimica et Cosmochimica Acta, Volume 71 (2007), Pages 2104–2119
|
207Pb/206Pb |
208Pb/232Th |
206Pb/238U |
187Os/188Os |
|
4,980 |
10,757 |
5,901 |
-15,603 |
|
4,933 |
10,993 |
5,774 |
-193,756 |
|
4,974 |
10,568 |
5,834 |
-193,756 |
|
4,981 |
10,960 |
6,711 |
-29,777 |
|
5,012 |
9,486 |
5,425 |
-117,487 |
|
4,974 |
13,455 |
6,456 |
-33,247 |
|
4,974 |
10,862 |
5,604 |
-22,379 |
|
4,963 |
11,708 |
5,557 |
-1,986 |
|
4,975 |
18,888 |
6,647 |
-6,733 |
|
4,943 |
12,181 |
5,022 |
-209,141 |
|
4,979 |
12,616 |
6,027 |
-7,666 |
|
4,968 |
5,110 |
5,075 |
-129,762 |
|
4,981 |
12,636 |
6,301 |
-22,396 |
|
4,966 |
22,610 |
9,806 |
-15,685 |
|
4,987 |
19,988 |
9,361 |
-47,273 |
|
4,957 |
38,898 |
5,259 |
-61,840 |
|
4,871 |
5,791 |
3,604 |
-178,371 |
|
4,951 |
16,548 |
3,994 |
-50,268 |
|
4,927 |
8,365 |
2,832 |
-317 |
|
4,987 |
12,056 |
8,576 |
-3,590 |
References
1. Using The U-Pb System, Geochimica et Cosmochimica Acta, Volume 62, Number 16, Pages 2823-2835, 1998
2. Uranium-Thorium-Lead Dating, Mereoritics And Planetary Science, 2000, Volume 35, Pages 341-346
3. Uranium And Lead Gain, Earth And Planetary Science Letters, 1974, Volume 21, Pages 389-399
4. Complete Pb/U Analysis, Earth and Planetary Science Letters, Volume 107 (1991), Pages 618-624
5. Sr, Nd And Pb Isotope Evidence, Contributions to Mineralogy and Petrology, Volume 114, 1993, Pages 171 - 188
6. New Aspects Of Dating Eclogites, Geochimica et Cosmochimica Acta, 1992, Volume 56, Pages 347-368
7. Os, Pb, and Nd isotope geochemistry, Geochimica et Cosmochimica Acta, Volume 71 (2007), Pages 2104–2119