Table 1.

U–Pb data from the Khoy ‘presumed’ meta-ophiolite

Properties*Weight (µg)U (ppm)Th/UPbi (ppm)§Pbc (pg)§206/204||207/2352σ (abs)206/2382σ (abs)rho207/2062σ (abs)206/238 (Ma)2σ (abs)207/235 (Ma)2σ (abs)207/206 (Ma)2σ (abs)
KY15-11; augen orthogneiss (GPS data: N38.50.05, E44.49.49)
Z eu lp-tip [1]14080.270.005.14220.673430.004980.0823160.0002140.380.059330.00041509.91.3522.83.0579.414.8
Z eu lp-tip [1]13030.300.003.64320.646520.007100.0797920.0005880.690.058770.00046494.93.5506.34.4558.417.1
Z eu sp [1]15410.220.001.221700.639970.002590.0794090.0002460.810.058450.00014492.61.5502.31.6546.75.1
Z eu lp [1]17320.160.000.943090.670040.002670.0833890.0002670.850.058280.00012516.31.6520.71.6540.14.5
Z eu tip [1]15590.150.000.643290.633130.002630.0790680.0002850.910.058070.00010490.61.7498.01.6532.63.8
Z eu sp [1]34240.150.002.326890.636010.002270.0801970.0002000.790.057520.00013497.31.2499.81.4511.44.8
KY15-9; granitic dyke within amphibolites (GPS data: N38.49.66, E44.49.65)
Z eu lp [1]12520.480.004.62590.586420.007200.0720500.0001960.230.059030.00070448.51.2468.64.6568.225.8
Z eu tip [1]23790.390.001.030370.544640.001930.0684730.0001510.720.057690.00014427.00.9441.51.3517.95.4
Z eu tip [1]52480.320.000.755950.416830.001220.0525000.0001150.820.057580.00010329.90.7353.80.9514.03.7
Z fr [2]112390.850.001.171240.394100.001260.0509010.0001240.850.056150.00010320.00.8337.40.9458.53.8
Z eu lp-tip[1]12340.440.001.54780.353430.003020.0467950.0001320.400.054780.00043294.80.8307.32.3403.217.5
Z lp-tip [1]11830.870.000.93170.176960.003780.0251260.0001080.430.051080.00101160.00.7165.43.3244.445.1
T eu-fr pbr-y [20]1591470.431.422231780.168430.003580.0249380.0000830.170.048980.00103158.80.5158.13.1147.148.5
T fr pbr-y [11]1851390.391.372491760.167730.003560.0250500.0000780.140.048560.00102159.50.5157.43.1126.748.8
T fr pbr [22]1231200.451.401711500.168480.004240.0249740.0000900.140.048930.00122159.00.6158.13.7144.357.4
KY15-8; granitic gneiss (GPS data: N38.49.75, E44.49.89)
Z eu tip [1]22040.510.001.99370.549220.002340.0685560.0001710.650.058100.00019427.41.0444.51.5533.77.1
Z tip [1]24990.420.001.028850.374890.001360.0486240.0001310.820.055920.00012306.10.8323.31.0449.14.6
Z eu tip [1]39020.250.000.960140.250690.000700.0342440.0000710.820.053090.00009217.10.4227.10.6332.83.7
Z fr [1]24530.130.000.819720.200440.000830.0284450.0000660.650.051110.00016180.80.4185.50.7245.77.3
Z eu tip [1]14760.470.000.612300.169380.003160.0249430.0001420.430.049250.00084158.80.9158.92.7159.939.3
T fr pbr [25]71870.334.8533745.90.170690.019630.0245900.0003320.030.050350.00581156.62.1160.016.9211.0247.5
T fr pbr [18]53880.523.3017459.00.173870.013200.0247570.0002270.040.050940.00387157.61.4162.811.4238.0166.6
KY15-3; metagranite (GPS data: N38.49.79; E44.50.78)
Z eu sp [1]18790.170.000.756541.007720.003390.0710090.0002030.900.102930.00015442.21.2707.71.71677.62.7
Z eu tip [1]123460.530.001.0149830.429900.001300.0567310.0001370.890.054960.00008355.70.8363.10.9410.63.2
Z eu sp [1]25620.450.001.623730.446690.002140.0562230.0001850.750.057620.00018352.61.1375.01.5515.46.9
Z lp-tip [1]11290.490.003.01260.315500.009030.0408140.0001860.160.056060.00158257.91.2278.46.9454.961.5
Z lp fr [1]15200.510.001.84910.179040.002020.0260740.0001050.430.049800.00051165.90.7167.21.7185.823.6
Z eu tip [1]33730.310.001.313340.178150.000850.0259080.0000680.620.049870.00019164.90.4166.50.7189.08.7
Z lp-fr [1]12700.610.000.76160.175060.001790.0251720.0000930.460.050440.00046160.30.6163.81.5215.320.9
T eu-fr pbr [28]103940.523.6636857.90.161350.013880.0244400.0002340.060.047880.00412155.71.5151.912.193.4192.0
T eu-fr pbr [18]107880.674.1843650.60.168120.016650.0244370.0002820.030.049900.00496155.61.8157.814.4190.2216.1
T br-tu [18]1651000.595.3485345.20.159200.018520.0225600.0003130.020.051180.00598143.82.0150.016.1249.0248.8
KY15-4; metagranite (GPS data: N38.49.70, E44.50.08)
Z eu tip [1]312150.360.002.056470.385220.001220.0514050.0001240.850.054350.00009323.10.8330.90.9385.63.7
Z eu sp [1]18830.380.001.317620.311310.001400.0436010.0001000.610.051780.00019275.10.6275.21.1275.98.2
Z eu tip [1]121780.530.001.635400.304590.001430.0426320.0001300.740.051820.00016269.10.8270.01.1277.47.2
Z lp fr [1]14910.600.000.811440.200050.001210.0286010.0000950.610.050730.00024181.80.6185.21.0228.511.0
Z eu tip [1]14250.510.001.64220.171100.001870.0250820.0000930.410.049480.00050159.70.6160.41.6170.423.2
Z lp-fr [4]67440.220.001.065860.170960.000560.0250650.0000560.750.049470.00011159.60.4160.20.5170.05.1
T br-tu [7]401640.302.00831410.172080.004450.0251350.0000940.140.049650.00127160.00.6161.23.9178.858.7
T fr y [5]45115.540.3220580.173510.011370.0249130.0001940.090.050510.00330158.61.2162.59.8218.7144.4

* Z, zircon; T, titanite; eu, euhedral, lp, long prismatic; sp, short prismatic; eq, equant; fr, fragment; br, brown; pbr, pale brown, nearly colourless; y, yellow; tu, turbid; zircon treated with chemical abrasion (Mattinson 2005); titanite not abraded; number in brackets is the number of grains analyzed.

Weight and concentrations are known to better than 10%.

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

§ Pbi is initial Pb (corrected for blank); Pbc is total common Pb in sample (initial + blank).

|| Raw data, corrected for fractionation and spike.

Corrected for fractionation, spike, blank (206/204 = 18.59; 207/204 = 15.24) and initial common Pb (based on Stacey & Kramers 1975); error calculated by propagating the main sources of uncertainty. The U–Pb ratio of the spike used for this study is adapted to 206Pb/238 U = 0.015660 for the ET100 solution as obtained with the ET2535 spike at NERC (Natural Environment Research Council) Isotope Geosciences Laboratory.