| Reference Type | Journal (article/letter/editorial) |
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| Title | Carboniferous dikes of West Connacht, Ireland |
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| Journal | Transactions of the Royal Society of Edinburgh: Earth Sciences |
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| Authors | Mitchell, J. G. | Author |
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| Mohr, P. | Author |
| Year | 1987 | Volume | 78 |
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| Issue | 3 |
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| Publisher | Cambridge University Press (CUP) |
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| DOI | doi:10.1017/s0263593300011068Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 494066 | Long-form Identifier | mindat:1:5:494066:5 |
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| GUID | 0 |
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| Full Reference | Mitchell, J. G., Mohr, P. (1987) Carboniferous dikes of West Connacht, Ireland. Transactions of the Royal Society of Edinburgh: Earth Sciences, 78 (3) 133-151 doi:10.1017/s0263593300011068 |
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| Plain Text | Mitchell, J. G., Mohr, P. (1987) Carboniferous dikes of West Connacht, Ireland. Transactions of the Royal Society of Edinburgh: Earth Sciences, 78 (3) 133-151 doi:10.1017/s0263593300011068 |
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| In | (1987) Transactions of the Royal Society of Edinburgh: Earth Sciences Vol. 78 (3) Cambridge University Press (CUP) |
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| Abstract/Notes | ABSTRACTVigorous Carboniferous extensional tectonism and associated igneous activity is a feature of Ireland and the neighbouring areas of Newfoundland and Britain. In West Connacht, Ireland, dolerite dikes of late Carboniferous age are newly recognised and distinguished from Tertiary dolerites. In the N, the 320 Ma-old Logmor dike trends N–S across the Ordovician South Mayo Trough, and has an evolved, mildly alkaline basalt geochemistry. In the S, in Connemara, a diffuse and arcuate swarm of ENE–NE trending, 305 Ma-old dolerite dikes, the Teach Doite swarm, cuts the Galway Granite batholith and its envelope of Dalradian gneisses. These more tholeiitic dolerites reveal the mineralogical and geochemical effects of varying degrees of pervasive hydrothermal alteration, imposed on an original magmatic composition similar to that of mid-ocean ridge basalts. Variscan overprinting on k–Ar ages from West Connacht dolerites clusters at 300, 245 and 205 Ma. Overprinting is also a feature of much of the Galway Granite. Carboniferous diking in West Connacht may have responded to nascent opening of the proximate North Atlantic, its pattern related to domal uplift adjacent to the rifted zone. |
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