/* DATA DESCRIPTION: Citation: Estrada, Solveig; Höhndorf, Axel; Henjes-Kunst, Friedhelm (2001): Tab. 1: Geochemical analysis and age dating of Kap Washington Group volcanites and related dykes. PANGAEA, https://doi.org/10.1594/PANGAEA.107284, Supplement to: Estrada, S et al. (2001): Cretaceous/Tertiary volcanism in North Greenland: the Kap Washington Group. Polarforschung, 69, 17-23, hdl:10013/epic.29823.d001 Abstract: The bimodal, alkaline volcanic suite of the Kap Washington Group (KWG) at the northern coast of Greenland was investigated during the BGR CASE 2 expedition in 1994. Geochemical and Nd and Sr isotopic data are presented for basalts to rhyolites of the KWG and of related basaltic dykes cutting Lower Paleozoic sediments. In the evd(t) vs. (87Sr/86Sr)t diagram, the KWG basalts and rhyolites follow a common mixing trend with increasing crustal contamination from basic to acid volcanites. Assimilation of pre-existing crustal rocks during formation of the rhyolitic melt is documented by Nd model ages of 0.9-1.2 Ga and by different fractionation trends for the basalts and the rhyolites in the Y vs. Zr diagram. Petrographical and geochemical features indicate intra-plate volcanism which was active most probably during a continental rifting phase. A new Rb/Sr whole rock age on rhyolites of 64 ±3 Ma, corresponding to the result of LARSEN (1982), confirms that the volcanic activity lasted until the Cretaceous-Tertiary boundary. 40Ar139Ar dating on amphibol separates from a comendite yielded strongly disturbed age spectra with a minimum age of 37.7 ±0.3 Ma. This age is interpreted to date a hydrothermal overprint of the volcanic rocks related to compressive tectonics which led to the overthrust of basement rocks over the Kap Washington Group. Coverage: LATITUDE: 83.000000 * LONGITUDE: -40.000000 MINIMUM ELEVATION: 0.0 m * MAXIMUM ELEVATION: 0.0 m Event(s): kap_washington_group * LATITUDE: 83.000000 * LONGITUDE: -40.000000 * ELEVATION: 0.0 m * METHOD/DEVICE: Geological sample (GEOS) Comment: Sr and Nd were seperated from 50-100 mg of powder using standard ion exchange techniques and analysed as metal species on a MAT261 multicollector mass spectrometer in static mode. Parameter(s): Sample code/label (Sample label) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) Lithology/composition/facies (Lithology) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: Smear slide analysis Area/locality (Area) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) Rubidium [mg/kg] (Rb) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: X-ray fluorescence (XRF) Strontium [mg/kg] (Sr) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: ICP-AES, Inductively coupled plasma - atomic emission spectroscopy Rubidium-87/Strontium-86 ratio (87Rb/86Sr) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * COMMENT: 95% confidence level is +-2% Strontium-87/Strontium-86 ratio (87Sr/86Sr) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * COMMENT: 95% confidence level is +-0.06% Strontium-87/Strontium-86 ratio (87Sr/86Sr) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * COMMENT: 87Sr/86Sr - 64Ma Samarium [mg/kg] (Sm) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) Neodymium [mg/kg] (Nd) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) Samarium-147/Neodymium-144 ratio (147Sm/144Nd) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: Calculated Neodymium-143/Neodymium-144 ratio (143Nd/144Nd) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * COMMENT: 95% confidence level is +-0.014% ε-Neodymium (ε-Nd) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: Calculated * COMMENT: eNd - 64 Ma Age, dated [ka] (Age dated) * PI: Estrada, Solveig (https://orcid.org/0000-0001-7954-6046, solveig.estrada@bgr.de) * METHOD/DEVICE: Age, 87Rb/87Sr Rubidium-Strontium * COMMENT: T DM calc. according to 2-stage model of DePaolo et al. 1991 License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 454 data points */ Sample label Lithology (Smear slide analysis) Area Rb [mg/kg] (X-ray fluorescence (XRF)) Sr [mg/kg] (ICP-AES, Inductively coupled ...) 87Rb/86Sr (95% confidence level is +-2%) 87Sr/86Sr (95% confidence level is +-0.06%) 87Sr/86Sr (87Sr/86Sr - 64Ma) Sm [mg/kg] Nd [mg/kg] 147Sm/144Nd (Calculated) 143Nd/144Nd (95% confidence level is +-0.014%) ε-Nd (eNd - 64 Ma, Calculated) Age dated [ka] (T DM calc. according to 2-sta...) SE94/43 KWG acid volcanites/rhyolite Lockwood 159.9 22.83 20.32 0.72506 0.70659 9.0 55.6 0.0974 0.515760 -0.4 950000 SE94/46 KWG acid volcanites/rhyolite Lockwood 166.7 21.65 22.34 0.72627 0.70596 17.9 105.7 0.0985 0.512609 0.3 890000 SE94/48 KWG acid volcanites/rhyolite Lockwood 85.5 55.76 4.44 0.71055 0.70651 8.5 46.2 0.1110 0.512494 -2.1 1090000 SE94/49 KWG acid volcanites/rhyolite Lockwood 217.2 18.27 34.53 0.73692 0.70553 15.4 94.3 0.0985 0.512570 -0.5 960000 SE94/81 KWG acid volcanites/rhyolite (dyke) Lockwood 150.3 106.40 4.09 0.70923 0.70551 4.8 32.2 0.0899 0.512599 0.2 900000 SE94/79 KWG acid volcanites/rhyolite (dyke) Lockwood 155.1 92.82 4.84 0.70984 0.70544 5.1 34.0 0.0905 0.512604 0.2 900000 SE94/80 KWG acid volcanites/rhyolite (dyke) Lockwood 175.2 30.53 16.63 0.71915 0.70463 12.5 63.5 0.1190 0.512617 0.3 890000 SE94/91 KWG acid volcanites/quartz-trachyte Lockwood 168.7 256.83 1.90 0.70719 0.70546 4.9 31.5 0.0940 0.512536 -1.1 1010000 SE94/93 KWG acid volcanites/quartz-trachyte (dyke) Lockwood 155.2 194.06 2.32 0.70795 0.70584 5.5 34.5 0.0958 0.512419 -3.4 1190000 SE94/68A KWG acid volcanites/trachyandesite (dyke) Lockwood 15.3 331.84 0.13 0.70531 0.70519 7.9 50.9 0.0935 0.512617 0.5 870000 GM94/145 KWG acid volcanites/trachyte Kap Kane 141.6 315.56 1.30 0.70745 0.70627 7.3 43.9 0.1007 0.512397 -3.9 1230000 GM94/147 KWG acid volcanites/comendite Kap Kane 219.6 52.02 12.24 0.71874 0.70761 16.1 108.2 0.0897 0.512800 4.1 540000 SE94/98 KWG acid volcanites/comendite Kap Washington 312.0 8.56 106.43 0.78874 0.69200 33.2 181.2 0.1104 0.512848 4.8 460000 SE94/100 KWG acid volcanites/comendite Kap Washington 96.5 13.93 20.12 0.73238 0.71409 15.1 73.1 0.1246 0.512874 5.2 430000 SE94/108 KWG acid volcanites/comendite Kap Washington 115.9 6.40 52.64 0.75083 0.70297 13.5 75.5 0.1078 0.512827 4.5 500000 SE94/45 KWG basic volcanites/basalt Lockwood 74.0 391.40 0.55 0.70617 0.70567 3.7 21.6 0.1034 0.512670 1.4 800000 SE94/78 KWG basic volcanites/trachybasalt Lockwood 104.1 638.20 0.47 0.70524 0.70481 7.6 42.9 0.1064 0.512704 2.1 730000 SE94/83 KWG basic volcanites/tephrite Lockwood 34.2 1152.90 0.09 0.70461 0.70453 37.4 0.512723 SE94/97 KWG basic volcanites/basalt Lockwood 36.7 570.20 0.19 0.70462 0.70445 6.5 27.6 0.1422 0.512913 5.8 360000 SE94/94 KWG basic volcanites/basalt Lockwood 51.2 820.50 0.18 0.70514 0.70498 11.4 53.1 0.1296 0.512815 4.0 540000 FTG17 KWG basic volcanites/trachybasalt Lockwood 60.6 1068.40 0.16 0.70539 0.70524 6.5 37.6 0.1045 0.512711 2.2 720000 SE94/110 KWG basic volcanites/basalt Kap Kane 13.3 711.90 0.05 0.70394 0.70389 4.6 21.0 0.1332 0.512878 5.2 420000 SE94/102 KWG basic volcanites/basalt Kap Washington 79.5 487.10 0.47 0.70397 0.70354 6.0 29.2 0.1231 0.512884 5.4 400000 SE2/94B Dykes in Early Paleozoic sediments/dolerite NW of Frigg Fjord 30.5 469.74 0.19 0.70609 0.70593 8.8 38.5 0.1373 0.512924 6.1 330000 SE28/94 Dykes in Early Paleozoic sediments/olivine-dolerite W of Frigg Fjord 14.7 451.23 0.09 0.70575 0.70566 33.2 0.512837 SE29/94 Dykes in Early Paleozoic sediments/dolerite W of Frigg Fjord 9.6 728.36 0.04 0.70837 0.70834 8.4 38.1 0.1333 0.512809 3.9 560000 SE31/94 Dykes in Early Paleozoic sediments/dolerite W of Frigg Fjord 7.2 747.91 0.03 0.70904 0.70901 8.7 40.7 0.1282 0.512805 3.9 570000 SE94/122 Dykes in Early Paleozoic sediments/proph. basaltic dyke Luigi Amadeo 20.5 559.32 0.11 0.70626 0.70616 8.7 40.7 0.1282 0.512899 5.7 380000 SE11/94 Greenstones/dolerite NW of Frigg Fjord 6.3 411.71 0.04 0.70499 0.70495 8.0 33.9 0.1426 0.512884 5.3 420000 SE13/94 Greenstones/dolerite NW of Frigg Fjord 22.8 528.55 0.13 0.71049 0.71038 8.0 33.9 0.1421 0.512872 5.1 450000 SE14/94 Greenstones/dolerite NW of Frigg Fjord 4.6 476.61 0.03 0.70540 0.70537 7.6 31.8 0.1432 0.512876 5.1 440000 SE15/94 Greenstones/dolerite NW of Frigg Fjord 19.5 529.74 0.11 0.70964 0.70954 11.2 49.7 0.1354 0.512852 4.7 480000 SE21/94 Greenstones/dolerite NW of Frigg Fjord 5.7 621.71 0.03 0.70931 0.70929 5.8 23.8 0.1452 0.512898 5.5 400000