McDonnell, S., Troll, V. R., Emeleus, C. H., Meighan, I. G., Brock, D., Gould, R. J. (2004) Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers. Mineralogical Magazine, 68 (5) 725-738 doi:10.1180/0026461046850215
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers | ||
| Journal | Mineralogical Magazine | ||
| Authors | McDonnell, S. | Author | |
| Troll, V. R. | Author | ||
| Emeleus, C. H. | Author | ||
| Meighan, I. G. | Author | ||
| Brock, D. | Author | ||
| Gould, R. J. | Author | ||
| Year | 2004 (October) | Volume | 68 |
| Issue | 5 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461046850215Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243568 | Long-form Identifier | mindat:1:5:243568:2 |
| GUID | 0 | ||
| Full Reference | McDonnell, S., Troll, V. R., Emeleus, C. H., Meighan, I. G., Brock, D., Gould, R. J. (2004) Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers. Mineralogical Magazine, 68 (5) 725-738 doi:10.1180/0026461046850215 | ||
| Plain Text | McDonnell, S., Troll, V. R., Emeleus, C. H., Meighan, I. G., Brock, D., Gould, R. J. (2004) Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers. Mineralogical Magazine, 68 (5) 725-738 doi:10.1180/0026461046850215 | ||
| Abstract/Notes | AbstractThe Palaeogene Slieve Gullion Igneous Complex comprises a layered central intrusion surrounded by a slightly older ring dyke. The ring dyke contains two major intrusive rock types. About 70% of the ring dyke is occupied by porphyritic granophyre and 30% by porphyritic felsite. Locally complex relationships between the two lithologies are observed. Major and trace element compositions suggest that there are two distinct chemical groups within each lithology: a Si-rich felsite, concentrated in a ~1 m wide zone at the outer margins of the dyke which grades into a less Si-rich felsite towards the interior. Similarly, a Si-rich granophyre, concentrated in the centre of the intrusion grades outwards into a Si-poor granophyre facies.These rock relationships and geochemical variations suggest that a complex magma chamber hosted a stratified granitic magma body and various wall/floor magma facies. Low density, high-Si felsite magma from the top of the chamber was tapped first, followed by less Si-rich felsite magma as evacuation proceeded. The granophyres probably originate from the chamber walls/floor, representing more mushy equivalents of the felsite magma. Little granophyre magma was tapped during the early stages of the evacuation sequence. As evacuation continued, probably aided by trap-door caldera collapse, the ‘granophyre magmas’ intruded the already emplaced and slightly cooled felsite, forming the complexly zoned structure of the Slieve Gullion ring intrusion. | ||
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