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Pease, Victria; Vernikovsky, Valerij (2000): Tab. 2: U-Pb ion-microprobe ages from Taymyr peninsula [dataset]. 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

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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)
Comment:
Position of sites digitized from map.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Optional event labelEvent 2
2 Rock typeRockPease, Victria
3 Sample code/labelSample labelPease, Victriagrain.spot; c=core, m=rim
4 UraniumUmg/kgPease, Victria
5 LeadPbmg/kgPease, Victria
6 ThoriumThmg/kgPease, Victria
7 Thorium/Uranium ratioTh/UPease, Victria
8 --Pease, Victriaf 206 [%]
9 Lead-207/Lead-206 ratio207Pb/206PbPease, Victria
10 Lead-207/Lead-206, standard error207Pb/206Pb std e±Pease, Victria1 sigma
11 Lead-206/Uranium-238 ratio206Pb/238UPease, Victria
12 Lead-206/Uranium-238, error206Pb/238U e±Pease, Victria1 sigma
13 Age, datedAge datedkaPease, VictriaAge, 206Pb/207Pb Lead-Lead
14 Age, dated standard deviationAge dated std dev±Pease, VictriaAge, 206Pb/207Pb Lead-Lead
15 Age, datedAge datedkaPease, VictriaAge, 238U/206Pb Uranium-Lead
16 Age, dated standard deviationAge dated std dev±Pease, VictriaAge, 238U/206Pb Uranium-Lead
17 DiscordanceD%Pease, Victriarefers to the degree of discordance at the 2 sigma error limit between 207Pb/206Pb and 206Pb/238U ages
18 Age, commentCommPease, Victria* = values are not included in mean age determinations
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
564 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event 2		2 
Rock		3 
Sample label
(grain.spot; c=core, m=rim)		4 
U [mg/kg]		5 
Pb [mg/kg]		6 
Th [mg/kg]		7 
Th/U		8 
-
(f 206 [%])		9 
207Pb/206Pb		10 
207Pb/206Pb std e [±]
(1 sigma)		11 
206Pb/238U		12 
206Pb/238U e [±]
(1 sigma)		13 
Age dated [ka]
(Age, 206Pb/207Pb Lead-Lead)		14 
Age dated std dev [±]
(Age, 206Pb/207Pb Lead-Lead)		15 
Age dated [ka]
(Age, 238U/206Pb Uranium-Lead)		16 
Age dated std dev [±]
(Age, 238U/206Pb Uranium-Lead)		17 
D [%]
(refers to the degree of disco...)		18 
Comm
(* = values are not included i...)
510metagabbro1.1234152840.2720.700.183340.410.504481.49268300070002633000320000
510metagabbro2.13993141810.4900.040.207930.230.588951.46288900040002985000350001
510metagabbro3.1303188700.2370.120.178640.320.497001.43264000050002601000310000
510metagabbro4.137036212-0.05020.870.201302.900.558261.752837000470002859000400000
512metagabbro1.1287201850.3330.320.188840.360.545791.43273200060002808000330000
512metagabbro2.1264441641.40116.420.0509417.210.100121.9923800040400061500012000176
514metarhyolite1.1326431590.5460.058750.860.109802.18558000190006720001400016*
514metarhyolite2.1289371560.4970.060361.180.104221.8861700025000639000110000
514metarhyolite3.1561753930.6820.490.059821.200.104871.455970002600064300090005
514metarhyolite4.1381471670.4130.061690.840.101830.57663000180006250003000-5
514metarhyolite5.1182231080.5580.061051.630.100290.61641000350006160004000-3
514metarhyolite6.1427532120.4670.060760.800.101680.576310001700062400030000
514metarhyolite7.1416511680.4920.380.058531.130.101410.9055000025000623000500012
514metarhyolite8.1461582300.5260.060170.820.104350.596100001800064000040004
514metarhyolite9.1475582100.4480.060520.820.102070.566220001800062700030000
520diabase dike1.1c253301860.1070.232704.960.062383.1130710007900039000012000-89
520diabase dike2.1c1377210.0630.053901.860.045471.99367000420002870006000-19
520diabase dike3.1c5284655711.1410.100.204080.220.586641.44285900040002976000340002*
520diabase dike4.1m252151900.5630.052191.400.047371.742940003200029800050000
520diabase dike5.1c8049500.5543.210.146611.470.445601.992307000250002376000390000*
520diabase dike6.1m454283750.1860.079291.110.043691.621179000220002760004000-78
520diabase dike7.1c277162130.5100.055211.770.045110.64421000400002840002000-32
520diabase dike8.1c217121350.6830.051172.040.044690.7624800047000282000200012
520diabase dike9.1m206121330.2810.060362.260.044470.61617000490002800002000-55
55622-mica granite1.1c6201204040.5561.020.067601.190.155161.6885600025000930000150006
55622-mica granite2.1c376771970.3741.000.075341.740.168091.46107800035000100200014000-5
55622-mica granite3.1c307591290.4190.069541.030.161141.5791500021000963000140002
55622-mica granite4.1m8691665680.5922.380.067432.860.146221.7685100060000880000150000
55622-mica granite5.1c10321789470.30912.440.064364.330.114360.62753000930006980004000-7
55622-mica granite5.2m226338054960.42441.020.063348.440.071390.857200001800004450004000-39*
55622-mica granite6.1c334641820.5590.390.067361.330.155470.648490002800093200060009
55622-mica granite7.1c5271043530.6691.670.066071.170.152810.5580900025000917000500013
55622-mica granite8.1c484856330.87413.850.0610210.860.104680.9864000023500064200060000
55622-mica granite9.1c475582100.4480.060520.820.102070.566220001800062700030000
55622-mica granite10.1m546984040.4193.430.069281.630.137470.58907000340008300005000-8
55622-mica granite11.1c8941693960.3007.210.067843.750.138720.61864000780008370005000-2