Table 1.

U–Pb data for conglomerate pebble P4/10, Stølsheimen

Mineral characteristics1Weight2 (µg)U2 (ppm)Th/U3Pbc4 (pg)206Pb/204Pb5207Pb/235U6±2σ (abs.)206Pb/238U6±2σ (abs.)ρ207Pb/206Pb6±2σ (abs.)206Pb/238U6 (Ma)±2σ207Pb/235U6±2σ207Pb/206Pb6±2σDisc. (%)
Z eu A [1]12820.821.322841.72760.00930.170490.000800.900.073490.000171014.84.41018.93.5102851.4
Z eu A [1]11290.430.817881.7590.0210.17340.00180.910.073560.000361030.910.01030.47.6103010−0.1
R black [1]7280.038.82281.5010.0170.154240.000420.320.070590.00077924.72.4930.97.0946222.4
R red [1]1300.094.3500.4790.0680.071340.000730.560.04870.0067444.24.439746
T pale [4]71700.12675480.4900.0560.065780.000830.180.05400.0061410.75.140537
T pale [15]481190.08603570.4890.0400.065700.000640.090.05390.0044410.23.940427
  • 1 Z, zircon; R, rutile; T, titanite; eu, euhedral; A, treated with air abrasion; [1], number of grains.

  • 2 Weight and concentrations are known to better than 10%, except for those near and below the c. 1 µg limit of resolution of the balance.

  • 3 Th/U model ratio inferred from 208/206 ratio and age of sample.

  • 4 Pbc, total common Pb in sample (initial + blank).

  • 5 Raw data corrected for fractionation.

  • 6 Corrected for fractionation, spike, blank and initial common Pb; error calculated by propagating the main sources of uncertainty.