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- W2038527207 abstract "Abstract The Lleyn Peninsula of North Wales is penetrated by at least twenty stocks varying from microtonalite through to microgranite and these are closely associated with Caradocian volcanic rocks which include andesitic lavas. Major and trace element analyses show that the sample population may be separated into a peralkaline group and a sub-alkaline group. This latter group may be sub-divided into three compositional series which range from andesite to granite. The andesites are represented by the Caradocian lavas of the Moel y Penmaen district and these plot at one end of major and trace element variation diagrams. Their coherent relationships to the granitoids demonstrate the latter to be Ordovician and therefore ends a longstanding controversy concerning their age. The distinctive geochemistry of the andesites indicates the strong probability that they have evolved from transitional tholeiitic magma by low-pressure crystal fractionation. Apatite fractionation has strongly controlled the rare earth element abundances in the granitoids and for most compositions from andesite through granite their bulk distribution coefficient is greater than unity. The association of peralkaline granites, transitional tholeiites and other geological and geophysical evidence suggests that the area was a region of ensialic crustal tension during the mid-Ordovician." @default.
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- W2038527207 date "1982-04-01" @default.
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- W2038527207 title "The geochemistry and petrogenesis of the Lower Paleozoic granitoids of the Lleyn Peninsula, North Wales" @default.
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- W2038527207 doi "https://doi.org/10.1016/0016-7037(82)90162-4" @default.
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