Geological and isotope studies of microtonalite-hosted W-Sn mineralization in SE Ireland

Gallagher, Vincent

doi:10.1007/bf00206717

Cited by 16 publications

(14 citation statements)

References 31 publications

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“…Kennan et al, 1986;Whitworth and Feely, 1989). Microgranite-hosted W-Sn mineralisation, in the form of scheelite with arsenopyrite and fluorite, is spatially associated with the Tullow Lowlands Unit (Gallagher, 1987(Gallagher, , 1989 and minor vein-type Pb-Zn deposits also occur in the Northern and Lugnaquilla Units of the Granite (Williams and Kennan, 1983;Kennan et al, 1986).…”

Section: Geological Settingmentioning

confidence: 99%

Petrogenetic implications of garnets associated with lithium pegmatites from SE Ireland

Whitworth

1992

Mineral. mag.

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Spodumene pegmatites, aplites and schists from the Aclare Li prospect of SE Ireland host sporadically developed, small, red, euhedral garnets. Chemical data indicate that the pegmatite-and aplite-hosted garnets are rich in spessartine and are similar to garnets in many African Li-rich pegmatites. Partial melting as a source of the garnets is unlikely due to the large spessartine component, the abundance of inclusions within the garnets and the general P-T-X evolution of the pegmatite body. It is suggested that an aqueous fluid was exsolved during pegmatite crystallisation and complexed available Mn. Movement of this fluid to the intermediate zone of the pegmatite body produced areas of high Mn concentrations which permitted the crystallisation of spessartine-rich garnets at low pressures (<3 kbar).

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Section: Geological Settingmentioning

confidence: 99%

Petrogenetic implications of garnets associated with lithium pegmatites from SE Ireland

Whitworth

1992

Mineral. mag.

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“…The suggestion by Gallagher (1989) that source rocks of the W-hosting microtonalite at Ballinglen may have been metal-rich and that these may have given rise to both granite and mineralization is an interesting extension of ideas previously expressed by the present authors in relation, especially, to lithium mineralization. McArdle and Kennan (1988) suggested, following the model of Stewart (1978), that Li-pegmatites could represent anatectic melts derived from boron-and lithium-rich envelope metasediments.…”

Section: Lithological and Stratigraphic Influences On Mineralizationmentioning

confidence: 67%

“…McArdle and Kennan (1988) noted that the tungsten metal deposits around Ballinglen are also spatially related to a coticule-bearing sequence. Gallagher (1989) disputes the importance of a lithological control noting that tungstenbearing microtonalite sheets at Ballinglen occur over a 2 km stratigraphic thickness whereas coticule has a much more restricted stratigraphic range. Scheelite is, in fact, widely present in the granitic rocks of the district (Steiger and Bowden 1982;McArdle 1984).…”

Section: Lithological and Stratigraphic Influences On Mineralizationmentioning

confidence: 94%

“…Granite intrusion did not result in significant tourmalinization in rocks not stratigraphically associated with coticule and with a distinctive regional unit of andesitic lava; tourmalinites are confined to the sediments immediately underlying and overlying the andesites (McArdle et al 1989 b). Tourmaline composition is not, it seems, an unambiguous guide to origin though granite-related tourmaline tends to be iron-rich and that associated with stratabound ores to be more magnesian (Plimer 1987) as are those in SE Ireland (Gallagher 1987).…”

Section: Tourmalinite In Se Irelandmentioning

confidence: 98%

“…400 Ma Leinster Granite in SE Ireland (Kennan 1978;Williams and Kennan 1983;Kennan etal. 1986;Appleby and Williams 1988;McArdle and Kennan 1988;Gallagher 1989;McArdle et al 1989 a). Though there is as yet no clear definition of the time interval separating intrusion and mineralization, what evidence there is suggests that the interval is short ).…”

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confidence: 89%

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Deformational and stratigraphic influences on mineralization in SE Ireland

McArdle

Kennan

1992

Mineral. Deposita

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Abstract. The evidence that has accumulated to date to support the thesis that deformational and stratigraphic controls are reflected in the occurrence and siting of metal deposits in SE Ireland is evaluated. In the case of an important tungsten deposit, stratigraphic influences can be seen in the geochemical and mineralogical development of wallrocks prior to crystallization of granite-hosted mineralization. Tourmalinites, confined to a definable stratigraphic interval, are associated with pegmatite-hosted lithium deposits. Though the stratigraphic control is important, the tungsten and lithium deposits are, in addition, confined to the trace of a major deformation zone.A number of recent studies address the question of the origin of various metal deposits associated with tourmalinite on the margin of the ca. 400 Ma Leinster Granite in SE Ireland (Kennan

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Genesis of lithium pegmatites from the leinster granite margin, southeast ireland: Geochemical constraints

1991

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Extensive and economically-important lithium pegmatites have been described from the eastern flank of the large S-type peraluminous Leinster Granite batholith in southeast Ireland. This flank area is also the locus of a major dip-slip ductile shear zone which was active during emplacement of the Tullow Lowlands pluton of the batholith. All the known bedrock occurrences of lithium pegmatite are contained within this marginal deformation zone.Most previous studies have suggested derivation of the lithium pegmatites by fractionation from the Leinster Granite itself, though none are conclusive. More recently, an anatectic model has been proposed whereby the pegmatites were derived by melting of Li-rich sediments adjacent to the batholithic contact. Our investigation has been concerned with a detailed study of the Rb-Sr isotope systematics and trace element geochemistry of the pegmatites and their host granitoids in an attempt to resolve the problem of pegmatite genesis.The results suggest a strong geochemical and temporal coherence between the Leinster Granite and the lithium pegmatites. A model is proposed in which Li enrichment in residual magmas may be linked to the development of muscovite instead of biotite in the Leinster Granite itself. The Li excluded from entry to biotite then accumulates in highly mobile, low-viscosity pegrnatitic fluids which migrate into the marginal shear zone of the Tullow Lowlands pluton where they crystallize at considerably lower temperatures.

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Geological and isotope studies of microtonalite-hosted W-Sn mineralization in SE Ireland

Cited by 16 publications

References 31 publications

Petrogenetic implications of garnets associated with lithium pegmatites from SE Ireland

Petrogenetic implications of garnets associated with lithium pegmatites from SE Ireland

Deformational and stratigraphic influences on mineralization in SE Ireland

Genesis of lithium pegmatites from the leinster granite margin, southeast ireland: Geochemical constraints

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