U_Pb_Geochronology

8 ga 03 1600 206pb238u 1400 1200 02 1000

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Unformatted text preview: ore + average age of inherited zircon components igneous rim + in situ ion microprobe analyses + = multigrain analysis + = single grain analysis 0.0 0.0 2.0 4.0 207Pb/235U From Mortensen and Tosdal (1998) Wednesday, 15 August, 12 Example: Wolverine Porphyry data-point error ellipses are 2σ data-point error ellipses are 2σ 0.072 440 Fraction G 0.058 206 0.068 Pb/238U age = 352.3 +/- 2.5 207 Fraction F 420 206 Pb/ Pb age = 375.8+/-46.2 206Pb/238U Fraction C 206 0.056 0.060 207 U age = 347.8 +/- 1.2 206 Pb/ Pb age = 350.2+/-60.3 207 Pb/206Pb age = 349.2+/-34 Fraction G 0.055 0.056 206 342 340 U age = 332.9 +/- 0.9 0.054 0.052 0.048 0.053 0.3 0.39 338 320 U age = 356.3 +/- 1.1 350 360 346 238 Pb/ 380 Pb/ Pb/206Pb age = 375.3+/-10.1 354 238 Pb/ 238 207 400 Fraction A 206 206 358 0.057 0.064 Inheritence array 362 238 Pb/ U age = 348.4 +/- 0.8 207 Pb/206Pb age = 349.6+/-10.1 Pb-loss array 0.4 0.40 0.41 0.5 0.42 0.6 0.43 0.7 207 207 235 Pb/235U From Piercey et al. (2008) Wednesday, 15 August, 12 Example: Wo...
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This document was uploaded on 03/06/2014 for the course ES 4502 at Memorial University.

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