Magmatism in the Netherlands: expression of the north-west ... - KNAW

Table 1a. Radiometrically dated igneous rocks in the Netherlands subsurface.
Age, location Well Code Dated Age (Ma) Method Stratigr. Emplace- Intruded Rock type/ Refs. Remarks
interval (m) interval ment interval composition
Cretaceous
Rim Dutch Central Graben Offshore F10-1 (=PL1) 3426-3460 T.D. 99 ± 5 K-Ar ’Mid-’ Cretaceous I Zechstein Lamprophyre 1, 2
Rim Broad Fourteens Basin Offshore L13-3 ∼1820 101 ± 1 40Ar/ 39Ar ‘Mid-’ Cretaceous I Zechstein Olivine nephelinite 3 (a)
Broad Fourteens Basin Offshore Q7-2 ∼3450(?) 95 ± 2to106± 2 40Ar/ 39Ar ‘Mid-’ Cretaceous I Triassic Undersaturated basalt 3
West Netherlands Basin Giessendam-1 GSD-1 1190-1218 125 ± 25 K-Ar Early Cretaceous I Jur-Cret transition ‘Basalt’ 1
West Netherlands Basin Loon-op-Zand-1 LOZ-1 2572-2610 (prob) 132 ± 3 40Ar/ 39Ar Early Cretaceous I Lower Jurassic Nephelinite, basanite 3
West Netherlands Basin Andel-4 AND-4 1651.4-1652.1 133 ± 2 40Ar/ 39Ar Early Cretaceous I Middle Jurassic Nephelinite, basanite 3
or 1657.1-1658.0
Jurassic
Vlieland Basin Zuidwal-1 ZDW-1 1944-3002 T.D. 145 K-Ar Late Jurassic E Trachyte 4 (b)
144 ± 1 40Ar/ 39Ar Phonolite, biotite pyroxenite, 3 (c)
152 ± 3 40Ar/ 36Ar-40K/ 36Ar Trachyte, phonolite, leucitite 5
East of Texel-IJsselmeer High De Wijk-7 WYK-7 2443-2486 155 ± 4 K-Ar Late Jurassic I Silesian Olivine gabbro 1, 6
Rim Step Graben Offshore E6-1 (2415 m) 2405-2423 161 ± 4 K-Ar Middle Jurassic I Dinantian No data 1
E6-1 (2420 m) 183 ± 4 K-Ar Early Jurassic I Dinantian No data 1
Triassic
West Netherlands Basin Berkel-1 BER-1 ∼2944-2970 214 ± 25? K-Ar Late Triassic I Lower Jurassic Essexite or theralite 1, 3, 7 (d)
East of Texel-IJsselmeer High Wanneperveen-1 WAV-1 2030.5-2035 217 ± 20? K-Ar Late Triassic I Silesian Dolerite, (olivine-) gabbro 1, 8 (e)
Achterhoek High Winterswijk-1 WSK-1 4089.5-4149.5 218 ± 6 K-Ar Late Triassic I Silesian Olivine dolerite 1, 9
Dutch Central Graben Offshore F3-7 2928.0-2928.1 236 ± 6 K-Ar Middle Triassic V No data 1
Permian
Lower Saxony Basin Drouwenermond-1 DRM-1 3920.5-3953.5 258 ± 6 K-Ar Late Permian V No data 1
East of Texel-IJsselmeer High Baarlo-1 BRL-1 1772.5-1775 266 ± 18 K-Ar Early Permian I Silesian Dolerite (‘diabase’) 1
Cleaver Bank High Offshore E18-2 4437-4452 274 ± 7 K-Ar Early Permian I Dinantian Gabbro 1
East of Texel-IJsselmeer High De Wijk-7 WYK-7 2684-2691 289 ± 7 K-Ar Early Permian I Silesian Gabbro 1
Rim Lower Saxony Basin Hardenberg-2 HBG-2 3376.5-3441 290 ± 16 K-Ar Early Permian I Silesian Olivine gabbro 1
East of Texel-IJsselmeer High Steenwijkerwold-1 SWD-1 1937.5-1944.5 291 ± 8 K-Ar Early Permian E ‘Basalt’ 1 (f)
Carboniferous
East of Texel-IJsselmeer High Dwingelo-2 DWL-2 3754.3-3792.2 T.D. 322 ± 15 K-Ar Carboniferous I Silesian Olivine gabbro 1, 6
Eastern Texel-IJsselmeer High Nagele-1 NAG-1 2772.5-2776 327 ± 8 K-Ar Namurian E No data 1 (g)
Devonian
Elbow Spit High Offshore A17-1 2157-2195 341 ± 30 ? Late Devonian E Rhyolite-Rhyodacite 1 (h)
3013-3043.7 T.D. Min. 346 ± 7 40Ar/ 39Ar ‘Basement’ I Biotite monzo-granite 10 (I)
1 For notes see Table 1b.
Geology of the Netherlands 201