Table 2.

Selected data for the West Greenland sub-province

LocalityUnitLithologyMethodMineralTypeAge (Ma)±2σMSWD (P)References
DiskoVaigat Formation (Manitdlat Member)Alkali picriteAr–ArGlass (264091)Plateau61.861Storey et al. (1998)
NuussuaqVaigat Formation (Naujanguit Member)Tholeiitic basaltAr–ArWhole rock (402525)Plateau61.551Storey et al. (1998)
DiskoMaligât Formation (Middle Rinks Dal Member)Tholeiitic basaltAr–ArPlagioclase (328406)Plateau61.450.8Storey et al. (1998)
NuussuaqMaligât Formation (Lower Rinks Dal Member)Tholeiitic basaltAr–ArPlagioclase (400323)Plateau61.650.8Storey et al. (1998)
HareøenHareøen Formation (Talerua Member)Transitionally alkaline basaltAr–ArGroundmass (113482)Plateau38.90.232.23 (0.05)Larsen et al. (2015)
HareøenHareøen Formation (Talerua Member)Transitionally alkaline basaltAr–ArGroundmass (113482)Plateau38.570.242.27 (0.06)Larsen et al. (2015)
Hareøen FormationGroundmass (113482)Weighted mean (MSWD)38.72.10 (3.9)
Svatenhuk HalvøNaqerloq FormationEnriched tholeiitic basaltAr–ArPlagioclase (251372)Plateau54.860.440.19 (0.99)Larsen et al. (2015)
Svatenhuk HalvøNaqerloq FormationEnriched tholeiitic basaltAr–ArPlagioclase (278596)Plateau55.910.60.06 (1.00)Larsen et al. (2015)
Svatenhuk HalvøArfertuarsuk trachyte flowTrachyteAr–ArAnorthoclase (1931.1)Plateau57.510.244.15 (1.91)Larsen et al. (2015)
Svatenhuk HalvøSkalø MemberTholeiitic basaltAr–ArPlagioclase (262838)Plateau57.980.590.06 (1.00)Larsen et al. (2015)
Svatenhuk HalvøNuuit MemberTholeiitic basaltAr–ArPlagioclase (262773)Plateau58.050.590.15 (0.99)Larsen et al. (2015)
Svatenhuk HalvøTunuarsuk MemberTholeiitic basaltAr–ArWhole rock (278566)Plateau59.410.610.33 (0.90)Larsen et al. (2015)
Ubekendt EijlandErqua FormationAlkali basaltAr–ArWhole rock (438728)Plateau53.470.520.65 (0.71)Larsen et al. (2015)
Ubekendt EijlandNûk takisôq MemberPitchstoneAr–ArFeldspar (438740)Plateau55.940.21.56 (0.18)Larsen et al. (2015)
Ubekendt EijlandQeqertalik MemberTholeiitic basaltAr–ArPlagioclase (455809)Plateau59.970.891.26 (0.26)Larsen et al. (2015)
Western Nuussuaq and HareøenUpper Kanisut MemberAcid tuffAr–ArAlkali Feldspar (135152)Plateau54.030.330.48 (0.89)Larsen et al. (2015)
Western Nuussuaq and HareøenMiddle Kanisut MemberComendite tuffAr–ArSanidine (410140)Plateau54.860.320.91 (0.52)Larsen et al. (2015)
Western Nuussuaq and HareøenLower Kanisut MemberTuffAr–ArPlagioclase (456257)Plateau56.150.410.06 (1.00)Larsen et al. (2015)
Western Nuussuaq and HareøenUpper Ifsorisok MemberTuffAr–ArAlkali Feldspar (489172)Plateau58.310.30.83 (0.58)Larsen et al. (2015)
Western Nuussuaq and HareøenMiddle Ifsorisok MemberTuffAr–ArAlkali Feldspar (489165)Plateau58.660.340.25 (0.99)Larsen et al. (2015)
Hellefisk-1 well2889.5 m below rotary tableTholeiitic basaltAr–ArWhole rock (02A-00-0431)Plateau61.341.161.74 (0.09)Larsen et al. (2015)
Hellefisk-1 well2938.3 m below rotary tableTholeiitic basaltAr–ArWhole rock (02A-00-0447)Plateau59.691.330.16 (0.99)Larsen et al. (2015)
DiskoDykeBasaltAr–ArPlagiocalse (176601)Plateau54.620.6Storey et al. (1998)
Disko (northern)DykeTholeiitic basaltAr–ArWhole rock (332904)Inverse isochron57.432.590.30 (0.88)Larsen et al. (2015)
Disko (eastern)DykeTholeiitic basaltAr–ArPlagioclase (318800)Plateau58.340.40.12 (1.00)Larsen et al. (2015)
Disko Bugt (SE of Disko)GabbroTholeiitic gabbroAr–ArPlagioclase (148D-01)Plateau58.960.511.27 (0.26)Larsen et al. (2015)
NuussuaqDykeBasaltAr–ArPlagioclase (340797)Plateau55.840.8Storey et al. (1998)
Nuussuaq (west)DykeTholeiitic basaltAr–ArPlagioclase (135129)Plateau48.022.761.1 (0.36)Larsen et al. (2015)
Nuussuaq (north)SillAlkalineAr–ArPlagioclase (489154)Plateau54.520.670.61 (0.75)Larsen et al. (2015)
Nuussuaq (SE)Tholeiitic basaltAr–ArWhole rock (318802)Plateau56.421.60.66 (0.65)Larsen et al. (2009)
Ubekendt EijlandDykeLamprophyreAr–ArK-Feldspar (UE500)Plateau34.750.4Storey et al. (1998)
Ubekendt EijlandSarqâta qáqâGranophyreAr–ArAlkali Feldspar (417747)Plateau55.210.32.27 (0.03)Larsen et al. (2015)
Ubekendt EijlandSarqâta qáqâGabbroAr–ArPlagioclase (455754)Plateau56.990.491.84 (0.09)Larsen et al. (2015)
GodthåbsfjordCamptoniteAr–ArPlagioclase (201449)Inverse Isochron51.461.81.38 (0.24)Larsen et al. (2009)
Søndre IsortoqAlkali basaltAr–ArPlagioclase (KØ17090)Plateau58.111.21.06 (0.38)Larsen et al. (2009)
Søndre IsortoqCamptoniteAr–ArWhole rock (KØ17154)Plateau55.431.21.94 (0.16)Larsen et al. (2009)
ItilleqDykeTholeiitic basaltAr–ArPlagioclase (464627)Plateau63.582.60.28 (0.95)Larsen et al. (2009)
Aasiaat RegionGrønne Ejland SillTholeiitic basaltAr–ArPlagioclase (455793)Plateau60.41.60.38 (0.82)Larsen et al. (2009)
Aasiaat RegionGlobular dykeTholeiitic basaltAr–ArPlagioclase (464536)Plateau55.730.41.49 (0.20)Larsen et al. (2009)
  • Weighted mean age (recalculated after Larsen et al. (2015): ±2σ) and MSWD values (in parentheses) are shown in italicized bold type. Numbers in parentheses refer to the sample numbers taken directly from the original source. Ages are corrected to Kuiper et al. (2008), and the 40K decay constant of Min et al. (2000).