/* DATA DESCRIPTION: Citation: Pease, Victria; Vernikovsky, Valerij (2000): Tab. 2: U-Pb ion-microprobe ages from Taymyr peninsula. PANGAEA, https://doi.org/10.1594/PANGAEA.759565, Supplement to: Pease, V; Vernikovsky, V (2000): The tectono-magmatic evolution of the Taimyr Peninsula: further constraints from new ion-microprobe data. Polarforschung, 68, 171-178, hdl:10013/epic.29804.d001 Abstract: We present the initial results of a U-Th-Pb zircon ion-microprobe investigation on samples from the Central Belt of Taimyr, in order to constrain its tectono-magmatic evolution. The zircon samples are from a deformed twomica granite (Faddey Massif), deformed metamorphosed gabbroic dike entrained as pods and lenses within metamorphosed tholeiitic basalts of the Kunar-Mod volcanic suite (Klyaz'ma River region), a metamorphosed rhyolite of the same volcanic suite overlying the basic metavolcanic rocks, as well as an undeformed dolerite dike which intrudes the metamorphosed Kunar-Mod basic volcanic rocks. Preliminary results on zircons from the two-mica granite suggest a crystallization age of ~630 Ma for this rock, with inheritance from assimilated crust 840 Ma to 1.1 Ga in age. In the Klyaz'ma River region, zircons from the meta-rhyolite yield a concordant age of -630 Ma. Zircons from the entrained metagabbroic dikes have so far yielded an age of -615 Ma (1 grain), as well as Archean ages (5 grains, concordant at 2.6-2.8 Ga). It seems likely that the Archean grains represent assimilation of older crustal material. Zircons from the post-tectonic dolerite dike have a bimodal age distribution. A well-defined younger age of 281 ±9 Ma is interpreted to represent the crystallization age of the dike, while older, concordant ages of 2.6-2.9 Ga likely represent assimilation of Archean crust (Siberian craton at depth). Several important conclusions can be drawn from the data. (1) The mafic and felsic lithologies of the Kunar-Mod volcanic suite are genetically related and should be the same age. Ages of-630 Ma (meta-rhyolite) and -615 Ma (metagabbroic dikes representing the latest stage of mafic magmatism associated the Kunar-Mod suite) suggest that these lithologies may be the same age, but more data are required to confirm this hypothesis. (2) The 630 Ma two-mica granite is similar in age to the time of high-grade metamorphism, suggesting that syntectonic granite emplacement accompanied obduction of the accretionary Central Belt to the Siberian craton. (3) An Early Permian age is well defined for the undeformed dolerite dike. Dolerite dikes occur across the whole of Taimyr, but are deformed to the south. If related, this single magmatic event pre-dates Permo-Triassic Siberian trap magmatism. Furthermore, it suggests that deformation was localized to southeastern Taimyr. Coverage: MEDIAN LATITUDE: 77.142020 * MEDIAN LONGITUDE: 104.194000 * SOUTH-BOUND LATITUDE: 76.916700 * WEST-BOUND LONGITUDE: 103.180000 * NORTH-BOUND LATITUDE: 77.240000 * EAST-BOUND LONGITUDE: 107.100000 Event(s): 510tay (510) * LATITUDE: 77.166700 * LONGITUDE: 103.750000 * LOCATION: Taymyr * METHOD/DEVICE: Geological sample (GEOS) 512tay (512) * LATITUDE: 77.170000 * LONGITUDE: 103.700000 * LOCATION: Taymyr * METHOD/DEVICE: Geological sample (GEOS) 514tay (514) * LATITUDE: 77.216700 * LONGITUDE: 103.180000 * LOCATION: Taymyr * METHOD/DEVICE: Geological sample (GEOS) 520tay (520) * LATITUDE: 77.240000 * LONGITUDE: 103.240000 * LOCATION: Taymyr * METHOD/DEVICE: Geological sample (GEOS) 5562tay (5562) * LATITUDE: 76.916700 * LONGITUDE: 107.100000 * LOCATION: Taymyr * METHOD/DEVICE: Geological sample (GEOS) Comment: Position of sites digitized from map. Parameter(s): Optional event label (Event 2) Rock type (Rock) * PI: Pease, Victria Sample code/label (Sample label) * PI: Pease, Victria * COMMENT: grain.spot; c=core, m=rim Uranium [mg/kg] (U) * PI: Pease, Victria Lead [mg/kg] (Pb) * PI: Pease, Victria Thorium [mg/kg] (Th) * PI: Pease, Victria Thorium/Uranium ratio (Th/U) * PI: Pease, Victria - (-) * PI: Pease, Victria * COMMENT: f 206 [%] Lead-207/Lead-206 ratio (207Pb/206Pb) * PI: Pease, Victria Lead-207/Lead-206, standard error [±] (207Pb/206Pb std e) * PI: Pease, Victria * COMMENT: 1 sigma Lead-206/Uranium-238 ratio (206Pb/238U) * PI: Pease, Victria Lead-206/Uranium-238, error [±] (206Pb/238U e) * PI: Pease, Victria * COMMENT: 1 sigma Age, dated [ka] (Age dated) * PI: Pease, Victria * METHOD/DEVICE: Age, 206Pb/207Pb Lead-Lead Age, dated standard deviation [±] (Age dated std dev) * PI: Pease, Victria * METHOD/DEVICE: Age, 206Pb/207Pb Lead-Lead Age, dated [ka] (Age dated) * PI: Pease, Victria * METHOD/DEVICE: Age, 238U/206Pb Uranium-Lead Age, dated standard deviation [±] (Age dated std dev) * PI: Pease, Victria * METHOD/DEVICE: Age, 238U/206Pb Uranium-Lead Discordance [%] (D) * PI: Pease, Victria * COMMENT: refers to the degree of discordance at the 2 sigma error limit between 207Pb/206Pb and 206Pb/238U ages Age, comment (Comm) * PI: Pease, Victria * COMMENT: * = values are not included in mean age determinations License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 564 data points */ Event 2 Rock Sample label (grain.spot; c=core, m=rim) U [mg/kg] Pb [mg/kg] Th [mg/kg] Th/U - (f 206 [%]) 207Pb/206Pb 207Pb/206Pb std e [±] (1 sigma) 206Pb/238U 206Pb/238U e [±] (1 sigma) Age dated [ka] (Age, 206Pb/207Pb Lead-Lead) Age dated std dev [±] (Age, 206Pb/207Pb Lead-Lead) Age dated [ka] (Age, 238U/206Pb Uranium-Lead) Age dated std dev [±] (Age, 238U/206Pb Uranium-Lead) D [%] (refers to the degree of disco...) Comm (* = values are not included i...) 510 metagabbro 1.1 234 152 84 0.272 0.70 0.18334 0.41 0.50448 1.49 2683000 7000 2633000 32000 0 510 metagabbro 2.1 399 314 181 0.490 0.04 0.20793 0.23 0.58895 1.46 2889000 4000 2985000 35000 1 510 metagabbro 3.1 303 188 70 0.237 0.12 0.17864 0.32 0.49700 1.43 2640000 5000 2601000 31000 0 510 metagabbro 4.1 370 362 12 -0.050 20.87 0.20130 2.90 0.55826 1.75 2837000 47000 2859000 40000 0 512 metagabbro 1.1 287 201 85 0.333 0.32 0.18884 0.36 0.54579 1.43 2732000 6000 2808000 33000 0 512 metagabbro 2.1 264 44 164 1.401 16.42 0.05094 17.21 0.10012 1.99 238000 404000 615000 12000 176 514 metarhyolite 1.1 326 43 159 0.546 0.05875 0.86 0.10980 2.18 558000 19000 672000 14000 16 * 514 metarhyolite 2.1 289 37 156 0.497 0.06036 1.18 0.10422 1.88 617000 25000 639000 11000 0 514 metarhyolite 3.1 561 75 393 0.682 0.49 0.05982 1.20 0.10487 1.45 597000 26000 643000 9000 5 514 metarhyolite 4.1 381 47 167 0.413 0.06169 0.84 0.10183 0.57 663000 18000 625000 3000 -5 514 metarhyolite 5.1 182 23 108 0.558 0.06105 1.63 0.10029 0.61 641000 35000 616000 4000 -3 514 metarhyolite 6.1 427 53 212 0.467 0.06076 0.80 0.10168 0.57 631000 17000 624000 3000 0 514 metarhyolite 7.1 416 51 168 0.492 0.38 0.05853 1.13 0.10141 0.90 550000 25000 623000 5000 12 514 metarhyolite 8.1 461 58 230 0.526 0.06017 0.82 0.10435 0.59 610000 18000 640000 4000 4 514 metarhyolite 9.1 475 58 210 0.448 0.06052 0.82 0.10207 0.56 622000 18000 627000 3000 0 520 diabase dike 1.1c 253 30 186 0.107 0.23270 4.96 0.06238 3.11 3071000 79000 390000 12000 -89 520 diabase dike 2.1c 137 7 21 0.063 0.05390 1.86 0.04547 1.99 367000 42000 287000 6000 -19 520 diabase dike 3.1c 528 465 571 1.141 0.10 0.20408 0.22 0.58664 1.44 2859000 4000 2976000 34000 2 * 520 diabase dike 4.1m 252 15 190 0.563 0.05219 1.40 0.04737 1.74 294000 32000 298000 5000 0 520 diabase dike 5.1c 80 49 50 0.554 3.21 0.14661 1.47 0.44560 1.99 2307000 25000 2376000 39000 0 * 520 diabase dike 6.1m 454 28 375 0.186 0.07929 1.11 0.04369 1.62 1179000 22000 276000 4000 -78 520 diabase dike 7.1c 277 16 213 0.510 0.05521 1.77 0.04511 0.64 421000 40000 284000 2000 -32 520 diabase dike 8.1c 217 12 135 0.683 0.05117 2.04 0.04469 0.76 248000 47000 282000 2000 12 520 diabase dike 9.1m 206 12 133 0.281 0.06036 2.26 0.04447 0.61 617000 49000 280000 2000 -55 5562 2-mica granite 1.1c 620 120 404 0.556 1.02 0.06760 1.19 0.15516 1.68 856000 25000 930000 15000 6 5562 2-mica granite 2.1c 376 77 197 0.374 1.00 0.07534 1.74 0.16809 1.46 1078000 35000 1002000 14000 -5 5562 2-mica granite 3.1c 307 59 129 0.419 0.06954 1.03 0.16114 1.57 915000 21000 963000 14000 2 5562 2-mica granite 4.1m 869 166 568 0.592 2.38 0.06743 2.86 0.14622 1.76 851000 60000 880000 15000 0 5562 2-mica granite 5.1c 1032 178 947 0.309 12.44 0.06436 4.33 0.11436 0.62 753000 93000 698000 4000 -7 5562 2-mica granite 5.2m 2263 380 5496 0.424 41.02 0.06334 8.44 0.07139 0.85 720000 180000 445000 4000 -39 * 5562 2-mica granite 6.1c 334 64 182 0.559 0.39 0.06736 1.33 0.15547 0.64 849000 28000 932000 6000 9 5562 2-mica granite 7.1c 527 104 353 0.669 1.67 0.06607 1.17 0.15281 0.55 809000 25000 917000 5000 13 5562 2-mica granite 8.1c 484 85 633 0.874 13.85 0.06102 10.86 0.10468 0.98 640000 235000 642000 6000 0 5562 2-mica granite 9.1c 475 58 210 0.448 0.06052 0.82 0.10207 0.56 622000 18000 627000 3000 0 5562 2-mica granite 10.1m 546 98 404 0.419 3.43 0.06928 1.63 0.13747 0.58 907000 34000 830000 5000 -8 5562 2-mica granite 11.1c 894 169 396 0.300 7.21 0.06784 3.75 0.13872 0.61 864000 78000 837000 5000 -2