The petrogenesis of Carboniferous–Permian dyke and sill intrusions across northern Europe

Kirstein, Linda A.; Davies, Gareth R.; Heeremans, Michel

doi:10.1007/s00410-006-0129-9

Cited by 25 publications

(33 citation statements)

References 43 publications

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“…Consequently, the low stress ratio that characterises the rift-related regional stress field might be an indicator for active rifting. However, plume activity seems to be excluded by the lack of an ageprogressive volcanic track, pre-magmatic subsidence instead of uplift (deposition of Asker Group sediments), low to moderate 3 He/ 4 He values, the absence of a large igneous province, and normal or only slightly elevated mantle temperatures (Heeremans et al, 1996;Kirstein et al, 2002Kirstein et al, , 2006Neumann et al, 2004;Timmerman et al, 2009). Furthermore, the clear predominance of N-S trending extensional structures in the area argues for a tectonically induced far-field tensional stress field and passive rifting.…”

Section: Tensional Stress Statesmentioning

confidence: 97%

Paleostress field reconstruction in the Oslo region

Sippel¹,

Saintot²,

Heeremans³

et al. 2010

Marine and Petroleum Geology

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Section: Tensional Stress Statesmentioning

confidence: 97%

Paleostress field reconstruction in the Oslo region

Sippel¹,

Saintot²,

Heeremans³

et al. 2010

Marine and Petroleum Geology

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“…1; Torsvik et al 2008). Other researchers have argued that the lack of evidence for a hotspot trace and initial doming (Pedersen & van der Beek 1994), and geochemical characteristics of the various magmas (Kirstein et al 2006), are more compatible with a passive extensional setting…”

mentioning

confidence: 95%

“…bostonite (syenite lamprophyre)) are present on Orkney (Flett 1935), but are volumetrically insignificant on a regional scale (Baxter 1987). The lamprophyres probably reflect low-degree melting of a heterogeneous, enriched mantle source related to decompression melting during a phase of regional extension (Kirstein et al 2006).…”

mentioning

confidence: 99%

Zircon U–Pb age for the Orkney lamprophyre dyke swarm, Scotland, and relations to Permo-Carboniferous magmatism in northwestern Europe

Lundmark

Gabrielsen

Brown³

2011

JGS

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Magmatic zircon in the syenite (bostonite) part of a composite NE–SW-trending cogenetic bostonite–camptonite dyke in Orkney, Scotland, yields a laser ablation inductively coupled plasma mass spectrometry age of 313 ± 4 Ma and ε Hf (313 Ma) values of +6 to +11. This suggests that the NE–SW-, east–west- and NW–SE-trending Scottish lamprophyre dyke swarms were emplaced during one late Carboniferous magmatic event, contrasting with published K–Ar dates ranging between c . 325 and 250 Ma. This magmatism is interpreted as a response to late Variscan regional extension or an early response to the Skagerrak mantle plume. Lamprophyre magmatism was initiated some 10 Ma earlier in Scotland than in the Oslo Rift. Supplementary material: Thin-section images of the investigated rocks, geochemical data and an REE plot, U–Pb and Hf isotopic data, and a Hf v. time diagram are available at www.geolsoc.org.uk/SUP18501 .

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“…They point to the operation of two distinct metasomatic styles, one intraplate and the other subduction-related, both very different from the xenoliths' host lavas. Streap xenolith-bearing dykes show the typical characteristics of an ocean island basalt (OIB)-like mantle source Kirstein et al 2006). …”

mentioning

confidence: 99%

Palaeozoic subduction-related and kimberlite or carbonatite metasomatism in the Scottish lithospheric mantle

Bonadiman

Coltorti

Duggen

et al. 2007

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Mantle xenoliths entrained in late Carboniferous to mid-Permian silica-poor basic magmas from northern Scotland were investigated using major and trace element compositions of minerals and isotopic compositions of whole-rocks and clinopyroxenes. The aim of the study was to gain more precise information on the nature of the lithospheric mantle beneath this terrane, including evidence for its metasomatic modification and evolution. This study concerns peridotites from two localities in the ENE and WSW of the Scottish Northern Highlands Terrane: Rinibar (South Ronaldsay, Orkney) and Streap Com'laidh (near Glenfinnan). Two groups of clinopyroxenes can be distinguished both at Streap Com'laidh (Type-S1 and Type-S2) and Rinibar (Type-R1 and Type-R2) based on different trace element contents and isotopic ratios. Type-S1 is characterized by an almost flat profile from middle rare earth elements (MREE) to heavy REE (HREE) accompanied by an overall light REE (LREE) enrichment. It shows the highest Th and U, coupled with low Sr, Zr and TiO 2 contents. Type-S2 exhibits humped LREE-enriched patterns and a steep decrease from Nd to Yb. It has the lowest Th and U, coupled with the highest Sr, TiO 2 and Zr contents. Both groups of clinopyroxenes present analogous isotopic features. They have measured 87 Sr/ 86 Sr values from 0.70652 to 0.70826, 144 Nd/ 143 Nd from 0.512093 to 0.512687 and 176 Hf/ 177 Hf from 0.282727 to 0.283088. These isotopic features could be explained by the addition in the mantle wedge of a slab component, made up of altered oceanic crust plus a moderate quantity of subducted sediments. The most recent subduction event in the geological history of Scotland is at about 400 Ma. It may have been during this convergent stage that the metasomatism affecting the sub-Streap lithospheric mantle occurred. Type-R1 is characterized by the lowest concentrations of Ba, Rb, Sr, LREE and U-Th, associated with remarkably high levels of Ti and Zr. These clinopyroxenes have measured 87 Sr/ 86 Sr ranging from 0.70330 to 0.70383, 144 Nd/ 143 Nd from 0.512643 to 0.512761 and 176 Hf/ 177 Hf from 0.282705 to 0.282899. In contrast, Type-R2 shows the highest concentrations of Ba, Rb, Sr, LREE and U-Th, and pronounced Ti and Zr negative anomalies. They have measured 87 Sr/ 86 Sr isotopic ratios similar to Type-R1, but lower 144 Nd/ 143 Nd (0.512431-0.512524) and higher 176 Hf/ 177 Hf (0.282921-0.283014). Calculated melt in equilibrium with Type-R1 is very similar to inferred primary kimberlitic magmas and the clinopyroxene trace element profiles may have resulted from an efficient chemical exchange between a percolating melt and the peridotite host rock. On the other hand the calculated Type-R2 melt overlaps the field of Proterozoic carbonatites. Significantly, at the age of 550 (+50) Ma, the two groups have almost identical Sr-Nd compositions, similar to average depleted mid-ocean ridge basalt mantle (DMM) at 550 Ma. This strongly suggests contemporaneous overprinting of DMM by kimberlitic and carbonatitic metasomatic agents at c. ...

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The petrogenesis of Carboniferous–Permian dyke and sill intrusions across northern Europe

Cited by 25 publications

References 43 publications

Paleostress field reconstruction in the Oslo region

Paleostress field reconstruction in the Oslo region

Zircon U–Pb age for the Orkney lamprophyre dyke swarm, Scotland, and relations to Permo-Carboniferous magmatism in northwestern Europe

Palaeozoic subduction-related and kimberlite or carbonatite metasomatism in the Scottish lithospheric mantle

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