Time and duration of activity in the British Tertiary Igneous Province

Mussett, A. E.; Dagley, P.; Skelhorn, R. R.

doi:10.1144/gsl.sp.1988.039.01.29

Cited by 86 publications

(58 citation statements)

References 39 publications

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“…Associated magmatic activity occurred mainly in the interval 63-52 Ma, mostly concentrated close to 59 Ma. Although acid magmatism followed basic in most cases, the latter occurred at intervals throughout (Mussett et al, 1988).…”

Section: Comparison With Other Tertiary Granites and Cornubian Granitesmentioning

confidence: 94%

The Lundy granite: a geochemical and petrogenetic comparison with Hercynian and Tertiary granites

Stone

1990

Mineral. mag.

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New chemical data show that the two main granite types (G1 and G2) cannot be discriminated, but that microgranite sheets/dykes (G3) are significantly different and more evolved, largely as a result of biotite, accessory mineral, and plagioclase fractionation. The Lundy granite is similar to other Tertiary granites of Scotland and Ireland, in age, setting, possible high-temperature mineralogy, relationship to basic magmatism, and REE patterns. These features and a highly evolved chemistry suggest derivation from an unexposed more 'primitive' granite that, in turn, had a basaltic parentage. However, similarities with the nearby S-type Hercynian granites, such as high aluminium saturation index (and normative corundum), high trace alkali, Nb, and F contents, low Zr, and high initial Sr ratio suggest a significant crustal component. The problem is resolved by proposing either mixing of silicic magma derived by strong fractionation of basaltic magma with anatectic magma from a pelitic/semi-pelitic crustal source, or fractionation of basaltic magma heavily contaminated by assimilated crustal material. Both origins would yield the high REE contents and fiat REE patterns of a 'primitive' granite magma. Fractionation, perhaps of hornblende initially, and later, of biotite and accessory minerals together with feldspars, would produce the small volume of highly fractionated Lundy granite.

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Section: Comparison With Other Tertiary Granites and Cornubian Granitesmentioning

confidence: 94%

The Lundy granite: a geochemical and petrogenetic comparison with Hercynian and Tertiary granites

Stone

1990

Mineral. mag.

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“…13c, Larsen et al, 1999;Hansen et al, 2002). Musset et al, 1988) and the Balder and Sele Formations plus correlatives in the North Sea and adjacent areas (after Knox and Morton, 1988). Phase 2b ashes (isopachs, in meters) correspond to the lower part of the Balder Formation in the North Sea, comprising Fe-Ti tholeiitic (basaltic) tuffs presumably derived from the Faeroes-Greenland area.…”

Section: -Local Phreatomagmatic Activity?mentioning

confidence: 99%

Mafic volcaniclastic deposits in flood basalt provinces: A review

Ross

Ukstins

McClintock

et al. 2005

Journal of Volcanology and Geothermal Research

137

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Flood volcanic provinces are assumed generally to consist exclusively of thick lavas and shallow intrusive rocks (mostly sills), with any pyroclastic rocks limited to silicic compositions. However mafic volcaniclastic deposits (MVDs) exist in many provinces, and the eruptions that formed such deposits are potentially meaningful in terms of potential atmospheric impacts and links with mass extinctions. The province where MVDs are the most voluminousthe Siberian Traps -is also the one temporally associated with the greatest Phanerozoic mass extinction. A lot remains to be learned about these deposits and eruptions before a convincing genetic link can be established, but as a first step, this contribution reviews in some detail the current knowledge on MVDs for the provinces in which they are better known, i.e. the North Atlantic Igneous Province (including Greenland, the Faeroe Islands, the British Isles, and tephra layers in the North Sea basin and vicinity), the Ontong Java plateau, the Ferrar, and the Karoo. We also provide a brief overview of what is known about MVDs in other provinces such as the Columbia River Basalts, the Afro-Arabian province, the Deccan Traps, the Siberian Traps, the Emeishan, and an Archean example from Australia. The thickest accumulations of MVDs occur in flood basalt provinces where they underlie the lava pile (Faeroes: >1 km, Ferrar province: ≥400 m, Siberian Traps: 700 m). In the Faeroes case, the great thickness of MVDs can be attributed to accumulation in a local sedimentary basin, but in the Ferrar and Siberian provinces the deposits are widespread (>3 x 10 5 km 2 for the latter). On the Ontong Java plateau over 300 m of MVDs occur in one drill hole without any overlying lavas. Where the volcaniclastic deposits are sandwiched between lavas, their thickness is much less. In most of the cases reviewed, primary MVDs are predominantly of phreatomagmatic origin, as indicated by the clast assemblage generally consisting of basaltic clasts of variable vesicularity (dominantly non-to poorly-vesicular) mixed with abundant country rock debris. The accidental lithic components often include loose quartz particles derived from poorly consolidated sandstones in underlying sedimentary basins (East Greenland, Ferrar, Karoo). These underlying sediments or sedimentary rocks were not only a source for debris but also aquifers that supplied water to fuel phreatomagmatic activity. In the Paraná-Etendeka, by contrast, the climate was apparently very dry when the lavas were emplaced (aeolian sand dunes) and no MVDs are reported. Volcanic vents filled with mafic volcaniclastic material, a few tens of metres to about 5 km across, are documented in several provinces (Deccan, North Atlantic, Ferrar, Karoo); they are though to have been excavated in relatively soft country rocks (rarely in flood lavas) by phreatomagmatic activity in a manner analogous to diatreme formation.

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“…7). Although there are reported radiometric ages for intrusions formed during the interval between the two pulses (Mussett et al, 1988), their total volume is relatively minor.…”

Section: North Atlantic Volcanismmentioning

confidence: 99%

40 Ar- 39 Ar ages of lavas from the southeast Greenland Margin, ODP Leg 152, and the Rockall Plateau, DSDP Leg 81

Sinton¹,

Duncan²

1998

Proceedings of the Ocean Drilling Program

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ABSTRACT40 Ar incremental heating experiments were performed on volcanic rocks recovered by drilling during Ocean Drilling Program Leg 152, southeast Greenland Margin (63°N), and Deep Sea Drilling Project Leg 81, southwest Rockall Plateau (56°N). Both of these legs drilled into thick sections of submerged lava flows, known as seaward-dipping reflector sequences, that are part of the Tertiary North Atlantic Volcanic Province (NAVP). Results show that subaerial volcanism began at the southeast Greenland Margin as early as 61−62 Ma with the eruption of continentally contaminated lavas. After an apparent hiatus, volcanism continued with the subaerial eruption of noncontaminated, mid-ocean-ridge basalt (MORB) -like lavas. A sill or flow was emplaced at 52 Ma into the sediments overlying the basement lavas at the most seaward site (918). The MORB-like lavas of the Rockall Plateau gave poor results, although the data suggest that they erupted at 57−58 Ma and may be contemporaneous with the compositionally similar oceanic lavas of Leg 152.Compiled ages from the NAVP indicate that most of the lavas were erupted in two distinct magmatic episodes. The first occurred prior to 60 Ma with volcanism at the southeast Greenland Margin, in West Greenland, and the northwest British Isles. This early stage of widespread volcanism most likely records the arrival of the Iceland mantle plume. The second phase of magmatism began about 57 Ma with voluminous basaltic eruptions centralized along the eventual line of continental separation. Magmatism at this stage was associated with continental breakup and asthenospheric upwelling with probable thermal input from the mantle plume.

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Time and duration of activity in the British Tertiary Igneous Province

Cited by 86 publications

References 39 publications

The Lundy granite: a geochemical and petrogenetic comparison with Hercynian and Tertiary granites

The Lundy granite: a geochemical and petrogenetic comparison with Hercynian and Tertiary granites

Mafic volcaniclastic deposits in flood basalt provinces: A review

40 Ar- 39 Ar ages of lavas from the southeast Greenland Margin, ODP Leg 152, and the Rockall Plateau, DSDP Leg 81

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