U_Pb_Geochronology

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Unformatted text preview: 0.0578 360 0.0574 0.0570 356 QuickTime™ and a decompressor are needed to see this picture. 0.0566 206Pb/238U 0.0562 352 0.0558 0.0554 Intercepts at 347.5±0.7 & 1684±220 Ma MSWD = 4.0 348 0.0550 0.405 0.415 0.425 207 0.435 0.445 Pb/ 235U From Ruks et al. (2006) Wednesday, 15 August, 12 Example: Biotite Granite, Yukon data-point error ellipses are 2 0.060 370 0.058 206Pb/238U 360 0.056 350 340 0.054 330 0.052 320 0.050 0.37 0.39 0.41 0.43 207 Pb/235U From Murphy et al. (2006) Wednesday, 15 August, 12 Example: Biotite Granite, Yukon 96DM-119 206Pb/238U age 207Pb/206Pb age A 338.4±0.6 358.9±5.4 B 327.4±0.6 357.6±6.3 C 341.7±0.7 358.5±5.8 D 331.3±0.8 354.4±5.6 Wednesday, 15 August, 12 Example: Biotite Granite, Yukon 96DM-119 206Pb/238U age 207Pb/206Pb age A 338.4±0.6 358.9±5.4 B 327.4±0.6 357.6±6.3 C 341.7±0.7 358.5±5.8 D 331.3±0.8 354.4±5.6 What do we do in this case? Wednesday, 15 August, 12 Example: Biotite Granite, Yukon data-point error ellipses are 2 360 0.0575 356 0.0565 352 348 0.0555 344 0.0545 QuickTime™ and...
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