| Reference Type | Journal (article/letter/editorial) |
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| Title | Reconstruction of an Ordovician seafloor volcanohydrothermal system: a case study from the Copper Coast, southeastern Ireland using field, geochemical and fluid inclusion data |
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| Journal | Mineralogical Magazine |
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| Authors | Breheny, C. | Author |
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| Moore, K. R. | Author |
| Costanzo, A. | Author |
| Feely, M. | Author |
| Year | 2016 (February) | Volume | 80 |
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| Issue | 1 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2015.079.7.09Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 244759 | Long-form Identifier | mindat:1:5:244759:3 |
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| GUID | 0 |
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| Full Reference | Breheny, C., Moore, K. R., Costanzo, A., Feely, M. (2016) Reconstruction of an Ordovician seafloor volcanohydrothermal system: a case study from the Copper Coast, southeastern Ireland using field, geochemical and fluid inclusion data. Mineralogical Magazine, 80 (1) 157-174 doi:10.1180/minmag.2015.079.7.09 |
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| Plain Text | Breheny, C., Moore, K. R., Costanzo, A., Feely, M. (2016) Reconstruction of an Ordovician seafloor volcanohydrothermal system: a case study from the Copper Coast, southeastern Ireland using field, geochemical and fluid inclusion data. Mineralogical Magazine, 80 (1) 157-174 doi:10.1180/minmag.2015.079.7.09 |
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| Abstract/Notes | AbstractVolcanic rocks in south County Waterford include flow-top hyaloclastite, pillow lavas and peperite, which are formed typically by sub-aqueous eruption or intrusion into unconsolidated sediment. Element mobility in wet sediment during emplacement of volcanic intrusions was reconstructed on a variety of spatial scales using bulk-rock and mineral analysis. Magma-sediment and magma-water interactions enhanced hydrothermal alteration. The chemistry of chlorite was a function of mixing between an Fe-rich magmatic fluid and a Mg-rich meteoric fluid. Chlorite geothermometry yields temperatures of formation between 230 and 388°C compatible with other metamorphic indicators. Fluid inclusion microthermometric data from genetically-related mineralized quartz veins reveal a hydrothermal vein mineralization event that occurred at lower temperatures during the end stage of volcanic activity. A convection driven mixing trend reflects the trapping of co-existing brine with entrained seawater concomitant with, the late stages of emplacement of the Bunmahon Volcano intrusions. |
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