| Reference Type | Journal (article/letter/editorial) |
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| Title | Subduction-related magmatism of late Ordovician age in eastern England |
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| Journal | Geological Magazine |
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| Authors | Pharaoh, T. C. | Author |
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| Brewer, T. S. | Author |
| Webb, P. C. | Author |
| Year | 1993 (September) | Volume | 130 |
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| Issue | 5 |
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| Publisher | Cambridge University Press (CUP) |
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| DOI | doi:10.1017/s0016756800020951Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 255959 | Long-form Identifier | mindat:1:5:255959:3 |
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| GUID | 0 |
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| Full Reference | Pharaoh, T. C., Brewer, T. S., Webb, P. C. (1993) Subduction-related magmatism of late Ordovician age in eastern England. Geological Magazine, 130 (5) 647-656 doi:10.1017/s0016756800020951 |
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| Plain Text | Pharaoh, T. C., Brewer, T. S., Webb, P. C. (1993) Subduction-related magmatism of late Ordovician age in eastern England. Geological Magazine, 130 (5) 647-656 doi:10.1017/s0016756800020951 |
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| In | (1993, September) Geological Magazine Vol. 130 (5) Cambridge University Press (CUP) |
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| Abstract/Notes | AbstractDeep boreholes show that plutonic and volcanic igneous rocks comprise an important component of the Caledonian basement in eastern England. The isotopic compositions of these rocks reveal that many of them are of late Ordovician age (440–460 Ma), and their geochemical compositions suggest calc–alkaline affinities. The intermediate (diorite-tonalite) plutonic rocks are associated with a prominent northwest–southeast trending belt of aeromagnetic anomalies extending from Derby to St Ives, Hunts., which is interpreted to work the plutonic core of a calc-alkaline magmatic arc. It is inferred that this arc was generated by the subduction of oceanic lithosphere, possibly from the Tornquist Sea, in a south or southwest direction beneath the Midlands Microcraton in late Ordovician times. The age and geochemical composition of concealed Ordovician volcanic rocks in eastern England, and hypabyssal intrusions of the Midlands Minor Intrusive Suite in central England, is compatible with such a hypothesis. |
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