Table 16.2.

Radiometric age data in the Western segment, Idefjorden terrane, modified after the geochronological database at the Geological Survey of Sweden

LithologyN_SWEREFE_SWEREFIsotope systemMethodMineralAge typeAge ± 2σ (Ma)Age interpretationReference
Granite dyke6424759305963U–PbSIMSZirconConcordia916 ± 11MagmaticScherstén et al. (2000)
Aplite–pegmatite6466764291758U–PbID-TIMSMonazite206Pb/238U922 ± 5MagmaticEliasson & Schöberg (1991)
Monzogabbro dyke6409244310613U–PbID-TIMSBaddeleyiteWeighted average 207Pb/206Pb935 ± 3MagmaticHellström et al. (2004)
Dolerite dyke6384277319737U–PbID-TIMSBaddeleyiteWeighted average 207Pb/206Pb950 ± 2MagmaticHellström & Persson (2009)
Monzogranite6393366296533U–PbSIMSZirconConcordia951 ± 7MagmaticÅrebäck et al. (2008)
Metagreywacke642169930412040Ar–39ArStep-wise heatingMuscovitePlateau981 ± 4CoolingAustin Hegardt et al. (2010)
Pegmatite dyke642161630380240Ar–39ArStep-wise heatingMuscovitePlateau994 ± 4MagmaticAustin Hegardt et al. (2010)
Granite6480736306970U–PbLaser ICP-MSZirconConcordia1027 ± 9MagmaticJansson (2016)
Amphibolite6421508304023Sm–NdID-TIMSGarnetIsochron1029 ± 6MetamorphicAustin Hegardt et al. (2010)
Pegmatite6396103316588U–PbID-TIMSColumbiteWeighted average 207Pb/206Pb1030 ± 1MagmaticRomer & Smeds (1996)
Pegmatite6460284301430U–PbID-TIMSColumbiteWeighted average 207Pb/206Pb1039 ± 3MagmaticRomer & Smeds (1996)
Pegmatite6450178300452U–PbID-TIMSColumbiteWeighted average 207Pb/206Pb1041 ± 2MagmaticRomer & Smeds (1996)
Gabbro6398739319755U–PbSIMSZirconConcordia1333 ± 8MagmaticKiel et al. (2003)
Granite6384995323766U–PbSIMSZirconUpper intercept1336 ± 10MagmaticAustin Hegardt et al. (2007)
Dolerite6456686288891U–PbID-TIMSZirconUpper intercept1457 ± 6MagmaticÅhäll & Connelly (1998)
Granitic gneiss6435169300524U–PbSIMSZirconWeighted average 207Pb/206Pb1496 ± 7MagmaticPetersson et al. (2015)
Gabbro6434332298263U–PbID-TIMSZirconUpper intercept1502 ± 2MagmaticÅhäll & Connelly (1998)
Granite6435372298310U–PbID-TIMSZirconUpper intercept1503 ± 3MagmaticÅhäll & Connelly (1998)
Gabbro6434464298441U–PbID-TIMSZirconUpper intercept1508 ± 16MagmaticÅhäll et al. (1990)
Leucosome in migmatitic paragneiss6421114304517U–PbSIMSZirconUpper intercept1513 ± 19MetamorphicAustin Hegardt et al. (2010)
Granite, porphyritic6536045270587U–PbLaser ICP-MSZirconWeighted average 207Pb/206Pb1519 ± 9MagmaticEliasson et al. (2012)
Granite6536395330898U–PbSIMSZirconNo information1530 ± 18MagmaticÅhäll & Connelly (2008)
Granite6438848314080U–PbID-TIMSZirconUpper intercept1530 ± 18MagmaticÅhäll (1990)
Granodiorite6441286317349U–PbSIMSZirconUpper intercept1530 ± 6MagmaticÅhäll & Connelly (2008)
Diorite6535251269248U–PbSIMSZirconUpper intercept1538 ± 7MagmaticÅhäll & Connelly (2008)
Gabbro6522242267806U–PbSIMSZirconUpper intercept1538 ± 7MagmaticÅhäll & Connelly (2008)
Granodiorite6473919321655U–PbSIMSZirconUpper intercept1539 ± 10MagmaticÅhäll & Connelly (2008)
Migmatite6530249268808U–PbSIMSZirconNo information1540 ± 9MetamorphicÅhäll & Connelly (2008)
Granite6501587270453U–PbSIMSZirconUpper intercept1541 ± 11MagmaticÅhäll & Connelly (2008)
Granodioritic gneiss6441075313455U–PbSIMSZirconWeighted average 207Pb/206Pb1543 ± 6MagmaticPetersson et al. (2015)
Palaeosome in migmatitic paragneiss6421114304517U–PbSIMSZirconUpper intercept1545 ± 13MetamorphicAustin Hegardt et al. (2010)
Granite6531546268593U–PbSIMSZirconUpper intercept1545 ± 5MagmaticÅhäll & Connelly (2008)
Granodiorite6501136282851U–PbID-TIMSZirconUpper intercept1546 ± 4MagmaticÅhäll & Connelly (2008)
Tonalite6395255320896U–PbSIMSZirconUpper intercept1547 ± 5MagmaticÅhäll & Connelly (2008)
Amphibolite dyke6420935303690U–PbSIMSZirconUpper intercept1547 ± 11MagmaticAustin Hegardt et al. (2010)
Granodiorite6502809280632U–PbID-TIMSZirconUpper intercept1550 ± 9MagmaticÅhäll & Connelly (2008)
Tonalitic dyke6412613301500U–PbID-TIMSZirconUpper intercept1553 ± 2MagmaticConnelly & Åhäll (1996)
Metadiorite6404892299294U–PbID-TIMSZirconUpper intercept1555 ± 2MagmaticConnelly & Åhäll (1996)
Gabbro6396223309891U–PbID-TIMSZirconUpper intercept1555 ± 3MagmaticÅhäll & Connelly (2008)
Intermediate intrusive rock6390751311955U–PbID-TIMSZirconWeighted average 207Pb/206Pb1558 ± 2MagmaticÅhäll & Connelly (2008)
Granite6400579314836U–PbID-TIMSZirconUpper intercept1559 ± 2MagmaticÅhäll & Connelly (2008)
Granitic gneiss6473905321628U–PbSIMSZirconWeighted average 207Pb/206Pb1560 ± 10MagmaticPetersson et al. (2015)
Metatonalite6427068298430U–PbID-TIMSTitaniteWeighted average 206Pb/238U1560 ± 10MetamorphicConnelly & Åhäll (1996)
Granodioritic gneiss6417902317110U–PbSIMSZirconWeighted average 207Pb/206Pb1561 ± 10MagmaticPetersson et al. (2015)
Gneissic granodiorite6362685316291U–PbSIMSZirconConcordia1561 ± 6MagmaticHellström et al. (2007b)
Leucogranite6532917345548U–PbSIMSZirconWeighted average 207Pb/206Pb1561 ± 7MagmaticSGU unpublished data
Granodiorite6399270313952U–PbID-TIMSZirconUpper intercept1563 ± 2MagmaticÅhäll & Connelly (2008)
Granite6476886327416U–PbID-TIMSZirconWeighted average 207Pb/206Pb1566 ± 3MagmaticÅhäll & Connelly (2008)
Granodiorite6417995317027U–PbSIMSZirconUpper intercept1570 ± 7MagmaticÅhäll & Connelly (2008)
Gabbro6368670309598U–PbSIMSZirconWeighted average 207Pb/206Pb1577 ± 5MagmaticHellström et al. (2008a)
Granite6436395301117U–PbID-TIMSZirconUpper intercept1580 ± 18MagmaticÅhäll et al. (1990)
Granitic augen gneiss6367010315541U–PbSIMSZirconWeighted average 207Pb/206Pb1582 ± 8MagmaticHellström et al. (2008b)
Granite6427056298435U–PbSIMSZirconWeighted average 207Pb/206Pb1584 ± 7MagmaticPetersson et al. (2015)
Metatonalite6427068298430U–PbID-TIMSZirconUpper intercept1587 ± 3MagmaticConnelly & Åhäll (1996)
Metagranite6434990300634U–PbID-TIMSZirconUpper intercept1588 ± 5MagmaticConnelly & Åhäll (1996)
  • Detrital zircon U–Pb ages (Åhäll et al. 1998; Cornell et al. 2000; Åhäll & Connelly 2008; Austin Hegardt et al. 2010) are not tabulated here but are discussed in the text. Geographical coordinates are given in the National SWEREF 99 TM coordinate system.

  • ICP-MS, inductively coupled plasma mass spectrometry; ID-TIMS, isotope dilution thermal ionization mass spectrometry; SGU, Sveriges geologiska undersökning (Geological Survey of Sweden); SIMS, secondary ion mass spectrometry.