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• W2979659392 abstract "The Paleocene lava succession of the Faroe Islands Basalt Group (FIBG), which is a part of the North Atlantic Igneous Province (NAIP), is intruded by numerous basaltic sills. These can be grouped into three main categories according to their geochemical characteristics: A low-TiO₂ sill category (TiO₂ = 0.7-0.9), a relatively high-TiO₂ sill category (TiO₂ = 1.95-2.6) and an intermediate-TiO₂ sill that displays major element compositions lying between the other two categories. Mantle normalised plots for the high-TiO₂ and low-TiO₂ sills display relatively uniform flat LREE trends and slightly steeper HREE slopes for high-TiO₂ relative to low-TiO₂ sills. The intermediate-TiO₂ Morskranes Sill is LREE depleted. Mantle normalised trace elements of low-TiO₂ sill samples define positive Eu and Sr anomalies, whereas high-TiO₂ sill samples display negative anomalies for these same lements. Different Nb and Ta anomalies (positive versus negative) in many high-TiO₂ versus low-TiO₂ sill samples suggest various metasomatism of their sources prior to partial melting. The intermediate-TiO₂ sill displays noticeably lower ⁸⁷Sr/⁸⁶Sr, ²⁰⁶Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios relative to both the high-TiO₂ and the low-TiO₂ sill samples. Pb isotope compositions displayed by local contaminated basaltic lavas imply that some of these assimilated distinct crustal material from E Greenland or basement from NW Britain, while others probably assimilated only distinct E Greenland type of crustal material. A third crustal source of E Greenland or Rockall-type basement could be required in order to explain some of the range in lead isotopes displayed by the intermediate-TiO₂ Morskranes Sill. Geochemical modelling suggest that Faroese high-TiO₂ sills, could have formed by ~4 to 7.5% batch melting of moderately fertile lherzolites, while 16 to 21% batch melting fertile mantle sources could explain geochemical compositions of Faroese low-TiO₂ sills. The intermediate-TiO₂ sill samples could have formed by a range of 6 to 7% batch melting of a depleted mantle source, probably with a composition comparable to sources that gave rise to local low-TiO₂ and intermediate-TiO₂ host-rocks. Most Faroese sill samples probably developed outside the garnet stabilitry field and probably formed by batch melting of mantle materials comparable in composition to those reported for the sub-continental lithospheric mantle (SCLM) previously at depths of ≤ 85 km. Relative enrichments in LREE (and LILE in general), and their varying Nb and Ta anomalies point to sources affected by metasomatism." @default.
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• W2979659392 date "2019-01-01" @default.
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• W2979659392 title "Contrasting TiO&lt;sub&gt;2&lt;/sub&gt; Compositions in Early Cenozoic Mafic Sills of the Faroe Islands: An Example of Basalt Formation from Distinct Melting Regimes" @default.
• W2979659392 doi "https://doi.org/10.11648/j.earth.20190805.11" @default.
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