Geochronology of the Tardree Rhyolite Complex, Northern Ireland: Implications for zircon fission track studies, the North Atlantic Igneous Province and the age of the Fish Canyon sanidine standard

Ganerød, Morgan; Chew, David; Smethurst, M. A.; Troll, Valentin R.; Corfú, Fernando; Meade, Fiona C.; Prestvik, Tore

doi:10.1016/j.chemgeo.2011.05.007

Cited by 45 publications

(18 citation statements)

References 38 publications

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“…In light of recent proposed refinements to, for example, 40 Ar/ 39 Ar standard ages and decay constants (e.g., Renne et al, 1998Renne et al, , 2010Renne et al, , 2011Min et al, 2000;Spell and McDougall, 2003;Nomade et al, 2005;Kuiper et al, 2008;Ganerød et al, 2011), as well as refinements to other dating systems, for example, the U-Pb (e.g., Condon et al, 2010) and RbSr (e.g., Nebel et al, 2011) dating systems, and the newly proposed air Ar isotope compositions (Lee et al, 2006;Valkiers et al, 2010; this study), we ask whether it is time for the International Union of Geological Sciences (IUGS) to convene a Commission on Geochronology? A review of the numerous developments that have been made since the last recommendation of a standard set of decay constants and isotope abundances in isotope geology, some 34 years ago (Steiger and Jäger, 1977), is surely overdue.…”

Section: Discussionmentioning

confidence: 96%

New high-precision measurements of the isotopic composition of atmospheric argon

Mark

Stuart

Podesta

2011

Geochimica et Cosmochimica Acta

136

109

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Section: Discussionmentioning

confidence: 96%

New high-precision measurements of the isotopic composition of atmospheric argon

Mark

Stuart

Podesta

2011

Geochimica et Cosmochimica Acta

136

109

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“…The samples were then step-heated using either a CO 2 laser on mineral separates or a resistance furnace (Heine type) for whole rocks. The detailed analytical procedure was described by Ganerød et al (2011).…”

Section: Methodsmentioning

confidence: 99%

Petrogenesis of the late Cretaceous K‐rich volcanic rocks from the Central Pontide orogenic belt, North Turkey

et al. 2014

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Subduction-related volcanic rocks are widespread in the Central Pontides of Turkey, and represented by the Hamsaros volcanic succession in the Sinop area to the north. The volcanic rocks display high-K calc-alkaline, shoshonitic and ultra-K affinities. 40 Ar/ 39 Ar age data indicate that the rocks occurred during the Late Cretaceous (ca 82 Ma), and the volcanic suites were coeval. Primitive mantle-normalized trace element patterns of all the lavas are characterized by strong enrichments in large ion lithophile elements (LILE) (Rb, Ba, K, and Sr), Th, U, Pb, and light rare earth elements (LREE; La, Ce) and prominent negative Nb, Ta, and Ti anomalies, all typical of subduction-related lavas. There is a systematic increase in the enrichment of incompatible trace elements from the high-K calc-alkaline lavas through the shoshonitic to the ultra-K lavas. In addition, the shoshonitic and ultra-K lavas have significantly higher 87 Sr/ 86 Sr (0.70666-0.70834) and lower 143 Nd/ 144 Nd (0.51227-0.51236) initial ratios than coexisting high-K calc-alkaline lavas ( 87 Sr/ 86 Sr 0.70576-0.70613, 143 Nd/ 144 Nd 0.51245-0.51253). Geochemical and isotopic data show that the shoshonitic and ultra-K rocks cannot be derived from the high-K calc-alkaline suite by any shallow level differentiation process, and point to a derivation from distinct mantle sources. The shoshonitic and ultra-K rocks were derived from metasomatic veins related to melting of recycled subducted sediments, but the high-K calc-alkaline rocks from a lithospheric source metasomatized by fluids from subduction zone.

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“…The Antrim Plateau lavas cover roughly 3 800 km 2 and are stratigraphically separated into the tholeiitic Lower and Upper Basalt Formations (Lyle and Patton 1989) - Figure 1. The up to 531 m thick Lower Basalts were erupted at 62.6 ± 0.6 Ma (Ganerød et al 2011). They become more intermediate in composition up-sequence (Lyle and Patton 1989), including isolated interbasaltic rhyolite extrusions in the Tardree Mountains in the centre of the Lower Basalts (Ganerød et al 2011).…”

Section: Palaeogene Lavasmentioning

confidence: 99%

“…The up to 346 m thick Upper Basalts were erupted at 59.6 ± 0.6 Ma and they mark a return to more primitive compositions (Ganerød et al 2011).…”

Section: Palaeogene Lavasmentioning

confidence: 99%

Distinct sulfur saturation histories within the Palaeogene Magilligan Sill, Northern Ireland: implications for Ni – Cu – platinum group element mineralisation in the North Atlantic Igneous Province

et al. 2019

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The ∼60 m thick Magilligan Sill is part of the British Palaeogene Igneous Province in the North Atlantic. The sill comprises layers of dolerite and olivine gabbro, and it intrudes a thick sequence of Mesozoic mudstones and marls, which are locally baked at the sill margins. Since 2014, the sill has been an exploration target for orthomagmatic Ni – Cu – platinum group element (PGE) sulfide mineralisation analogous to the Noril’sk-Talnakh intrusion in Russia. We present new petrological, geochemical, and S isotope data to assess the prospectivity of the sill and the underlying magmatic plumbing system. Most sulfides in the dolerite portions of the sill are <50 μm in size and comprise only pyrite with PGE abundances below the detection limit. In the olivine gabbros, >150 μm size pentlandite, chalcopyrite, and pyrrhotite grains contain <4 ppm total PGE, 1460 ppm Co, and 88 ppm Ag. Pyrite from the dolerites have δ34S ranging from −10.0‰ to +3.4‰ and olivine gabbro sulfides range from −2.5‰ to −1.1‰, suggesting widespread crustal contamination. The S/Se ratios of sulfides in the dolerites and olivine gabbros range from 3500 to 19 500 and from 1970 to 3710, respectively, indicating that the latter may have come from upstream in the magma plumbing system. The Magilligan Sill records multiple injections of mafic magma into an inflating sill package, each with distinct mechanisms towards S saturation. Whilst the sulfide minerals in the sill do not constitute significant mineralisation themselves, detailed in situ studies highlight a divergence in S saturation histories and suggest that a larger volume of olivine gabbro sulfides at depth may be prospective.

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Geochronology of the Tardree Rhyolite Complex, Northern Ireland: Implications for zircon fission track studies, the North Atlantic Igneous Province and the age of the Fish Canyon sanidine standard

Cited by 45 publications

References 38 publications

New high-precision measurements of the isotopic composition of atmospheric argon

New high-precision measurements of the isotopic composition of atmospheric argon

Petrogenesis of the late Cretaceous K‐rich volcanic rocks from the Central Pontide orogenic belt, North Turkey

Distinct sulfur saturation histories within the Palaeogene Magilligan Sill, Northern Ireland: implications for Ni – Cu – platinum group element mineralisation in the North Atlantic Igneous Province

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