A seabed radiometric survey of Haig Fras, S. Celtic Sea, U.K.

Jones, David G.; Miller, J.M.; Roberts, P.D.

doi:10.1016/s0016-7878(88)80035-x

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…2). A separate parallel negative gravity anomaly approximately 46 km long and up to 14 km wide extends over the Haig Fras seamount; dredge samples and radiometric surveys confirm granites hosted by Devonian-Carboniferous slates and phyllites (Jones et al 1988). The Haig Fras batholith represents a second parallel batholith north of the Cornubian batholith (Exley 1966).…”

Section: Gravity and Magnetic Anomalies Around Lundymentioning

confidence: 85%

Age and petrogenesis of the Lundy granite: Paleocene intraplate peraluminous magmatism in the Bristol Channel, UK

Charles

Whitehouse

Shail

et al. 2017

JGS

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The Lundy granite forms part of the Lundy Igneous Complex which is the southernmost substantive expression of the British Cenozoic Igneous Province (BCIP). Its Qz+Pl+Kfs+Bt±Grt±Tpz 16 mineralogy and peraluminous character contrast with other BCIP granites farther north but are similar to the granites of the adjacent Early Permian Cornubian Batholith. We present the results of mapping, petrographical and mineral chemical analysis, and the first U-Pb zircon ages for the granite (59.8 ± 19 0.4 -58.4 ± 0.4 Ma) and crosscutting basic dykes (57.2 ± 0.5 Ma) which confirm a Palaeocene age 20 for magmatism. Zircon inheritance is limited but two cores imply the presence of Lower Palaeozoic igneous rocks in the unexposed basement of SW England. The anomalous southerly location of the Lundy Igneous Complex is a consequence of mantle melting arising from the superposition of localised lithospheric extension, related to intraplate strike-slip tectonics, with the distal ancestral Icelandic plume. Granite generation primarily reflects crustal partial melting during the emplacement of mantle-derived melts. The change in geochemical character between the Lundy granite (peraluminous) and other BCIP granites (metaluminous / subalkaline) indicates a fundamental crustal source control between contrasting peri-Gondwanan and Laurentian basement provinces.

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