Table 1. 

U–Pb data for intrusive rocks, Magerøy

CharacteristicsWeight (μg)U (ppm)Th/UPbc (pg)206Pb/204Pb*207Pb/235U†±2σ (abs)206Pb/238U†±2σ (abs)ρ207Pb/206Pb†±2σ (abs)206Pb/238U†207Pb/235U207Pb/206Pb†±2σ (abs)D (%)
RJR-02-48C1, pegmatitic gabbro, Honningsvåg Igneous Complex (70°59′29.1″N, 25°55′54.6″E)
Z eu cl [50]1722590.6421.391750.53760.00150.070070.000180.950.055650.00005436.6436.8438.31.90.4
Z eu cl [50] aliquot2590.6424.579800.53660.00150.070000.000180.940.055600.00005436.1436.2436.42.10.0
Z eu fr cl (in) [>20]362310.6514.026070.53600.00150.069860.000160.810.055650.00009435.3435.8438.23.50.7
Z eu b [1]<1>170000.511.6454180.53850.00250.070220.000330.980.055620.00005437.5437.4437.21.9−0.1
Z eu b [1]9137500.5111.9453930.53710.00140.069970.000170.970.055670.00003436.0436.5439.41.40.8
Z eu b [1]764300.543.7537040.53450.00170.069660.000220.960.055650.00005434.1434.8438.62.01.1
Z eu b [1]3238000.490.93437730.53360.00170.069560.000210.980.055640.00003433.5434.2438.01.41.1
RJR-02-92, granite intruding Juldagnes Fm (70°58′27.4″N, 26°00′09.0″E)
Z eu lp fr cl, in [36]292320.485.653260.53800.00150.070070.000190.870.055690.00008436.6437.1439.93.10.8
Z eu lp fr cl [12]152500.495.530090.53670.00220.069970.000260.750.055630.00015436.0436.2437.76.10.4
Z eu eq-sp p-b [42]3134400.606.0775580.53730.00190.070000.000230.980.055660.00004436.2436.6439.01.60.7
Z eu eq-sp b [23]1439500.5769.634770.53330.00150.069540.000160.910.055620.00006433.4434.0437.22.60.9
Z eu eq-sp p-b [42]1836500.6111.7243530.53270.00170.069440.000210.980.055640.00004432.8433.6438.01.51.2
RJR-02-93, Finnvik granite (70°58′03.5″N, 25°28′12.4″E)
Z eu lp-fr cl in [50]294160.4120.725660.53440.00160.069740.000170.820.055570.00009434.6434.7435.23.70.2
Z eu lp-fr cl (in) [32]502710.417.677840.53390.00220.069690.000260.940.055560.00008434.3434.4434.83.20.1
Z eu tips cl (in) [60]464420.404.4201660.53250.00140.069450.000160.950.055610.00004432.8433.5437.01.81.0
Z eu lp (-fr) cl (in) [40]434180.405.0155740.53290.00140.069450.000180.940.055660.00005432.8433.8438.72.01.4
Z eu tips cl in [55]983300.3713.9100890.53140.00140.069250.000160.960.055650.00004431.6432.7438.51.71.6
Z eu long tips cl [40]414580.3718.543940.53000.00290.068850.000380.800.055830.00019429.2431.8445.57.73.8
Z eu lp (-fr) cl (in) [11]154540.345.651590.51570.00140.067240.000170.850.055630.00008419.5422.3437.73.24.3
C-04-6, Skarsvåg granite, Skarsvåg (71°06′53.4″N, 25°50′15.2″E)
Z eu lp-fr [25]117000.232.037790.53370.01400.069670.001821.000.055560.00012434.1434.2434.84.60.1
Z eu tip [10]95530.114.449580.53470.00200.069790.000210.880.055570.00010434.9434.9435.13.90.1
Z eu lp [38]155270.194.282780.53580.00120.069940.000140.930.055570.00005435.8435.7435.21.9−0.1
X eu [1]<1>56000.161.7143940.53630.00180.070010.000200.880.055560.00009436.2436.0434.63.5−0.4
M sb y [1]<1>306015.234.529780.53760.00240.070300.000280.860.055460.00013438.0436.8430.75.2−1.7
M sb y [1]<1>92016.294.68950.53730.00330.070540.000270.640.055240.00026439.4436.642210−4.3
RJR-02-85, granite dyke, Skarsvåg nappe, Øvre Langvatnet (71°06′04.0″N, 25°50′52.9″E)
Z eu tip p [1]<1>9100.010.579930.53660.00290.070110.000350.910.055510.00013436.8436.1432.85.0−1.0
Z eu tip p [1]<1>24000.011.377860.53030.00170.069270.000190.820.055520.00010431.8432.0433.34.10.4
Z eu tip p [1]<1>12400.000.961740.52560.00230.068530.000270.910.055630.00010427.3428.9437.74.02.5
Z eu tip p [1]<1>26200.010.9127330.52320.00250.068380.000310.910.055490.00011426.4427.3432.14.31.4
Z eu tip p [1]<1>18300.011.454140.51220.00230.066780.000270.900.055630.00011416.7419.9437.64.44.9
M eu flat-sp y [1]2158004.0715.788070.53390.00140.069960.000160.950.055350.00004435.9434.4426.51.7−2.3
M eu flat-sp y [1]<1>315003.399.1152120.53300.00130.069830.000150.950.055350.00004435.1433.8426.61.7−2.1
  • Z, zircon; X, xenotime; M, monazite; eu, euhedral; sb, subhedral; eq, equant; sp, short prismatic (l/w=2–4); lp, long prismatic (l/w >4); fr, fragment; cl, colourless; b, brown; y, yellow; p, pink; op, opaque; in, inclusions; [n], number of grains in fraction. 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. The Th/U model ratio is inferred from 208/206 ratio and age of sample. Pbc is the total common Pb in sample (initial + blank). D, degree of discordancy.

  • *Raw data corrected for fractionation and blank.

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