Tourmalinite as a potential host rock for gold in the Caledonides of Southeast Ireland

McArdle, P.; Fitzell, Melanie; Oosterom, M.G.; O’Connor, Patrick J.; Kennan, P. S.

doi:10.1007/bf00206320

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…Mineralizações de ouro relacionadas a turmalinitos são citadas por Plimer (1986) em Northern Territory (Austrália) e por MacArdle et al (1989) nos Caledonides do Sudeste da Irlanda. Garba (1996) propõe, em seu estudo sobre turmalinização associada a mineralizações auríferas do tipo lode em Bin Yauri (Nigéria), que a turmalina é um indicador útil para o entendimento das condições geoquímicas e físico-químicas dos fluidos hidrotermais auríferos.…”

Section: Geologia Uspunclassified

Turmalinitos vulcanogênicos da formação Morro da Pedra Preta do Grupo Serra do Itaberaba (SP): petrografia, composição química da turmalina e implicações metalogenéticas

Beljavskis

Garda

Mansueto

et al. 2005

Geol. USP, Sér. cient.

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Section: Geologia Uspunclassified

Turmalinitos vulcanogênicos da formação Morro da Pedra Preta do Grupo Serra do Itaberaba (SP): petrografia, composição química da turmalina e implicações metalogenéticas

Beljavskis

Garda

Mansueto

et al. 2005

Geol. USP, Sér. cient.

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“…Although tourmalinites of the Bin Yauri area are not directly related to gold mineralization, significant levels of gold are known to be associated with tourmalinites in the Northern Territory of Australia (Plimer 19861 and the Caledonides of Southeast Ireland (McArdle et al 1989). Tourmalinites may in some cases be interpreted as facies equivalents of exhalative sulphide deposits and banded iron formation (Slack 1982;Plimer 1988), and their recognition should stimulate exploration interest in any area in which they occur.…”

Section: Metailogenic Significancementioning

confidence: 99%

“…The relationships between tourmaline-rich rocks and metamorphic gold deposits have been documented in many metallogenic provinces, such as in the Precambrian of Ethiopia, Brazil, Mali, and Australia (Augustithis 1967; Fleischer and Routhier 1973;Dommanget et al 1985;Plimer 1986), Caledonian rocks of southeastern Ireland (McArdle et al 1989), and the Archaean Barberton sequence of South Africa (Byerly and Palmer 1991). Tourmaline is also a common hydrothermal gangue mineral in Archaean to Phanerozoic mesothermal and intrusion-related gold deposits (e.g.…”

mentioning

confidence: 99%

Tourmalinization related to Late Proterozoic-Early Palaeozoic lode gold mineralization in the Bin Yauri area, Nigeria

Garba

1996

Mineral. Deposita

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Abstract. Three types of tourmaline occurrence have been identified in the area of Bin Yauri, Nigeria, mesothermal lode-gold mineralization. These are: (1) stratabound tourmalinites in pelitic metasediments, (2) tourmaline in a hydrothermal alteration assemblage within hornfelsed wall rocks, (3) tourmaline in auriferous quartz and quartz-carbonate veins. Although the tourmaline occurrences are all within or close to the contact aureole of a granodiorite intrusion, geochemical characteristics of the tourmalines are broadly similar and reflect a common metasedimentary source. Two stages of tourmalinization are envisaged. The earlier (ca. 1100 Ma) involved syngenetic-diagenetic formation of tourmalinites, while the later (ca. 500 Ma) involved epigenetic (hydrothermal) tourmaline-gold mineralization, possibly derived by dehydration and devolatilization of metasedimentary sequences containing tourmaline-rich rocks or tourmalinites. Electron microprobe analyses indicate that the tourmalines are intermediate members of the schorl-dravite solid solution series. Plots involving FeO, MgO, and/or A1203 from these analyses are used to constrain the sources and processes of tourmalinization. Two metallogenic implications are derived from this study. One is that, although the tourmalinites are barren of gold and base metal mineralization, their occurrences nevertheless encourages exploration for syngenetic-exhalative massive sulphide deposits in the region. The other implication applies to the potential use of tourmaline in deciphering the physico-chemical conditions of gold-mineralizing fluids in the Bin Yauri area.Tourmaline and tourmaline-rich rocks are known in a variety of geologic settings but are most notable in granite-related metasomatic and vein-type tin-tungsten deposits, in clastic metasedimentary sequences, and in Present address: Department of Geology, Ahmadu Bello University, Samaru, Zaria, Nigeria stratabound base metal ore deposits (e.g. Ethier and Campbell 1977;Slack 1982;Williams and Kennan 1983;Slack et al. 1984;Taylor and Slack 1984;Henry and Guidotti 1985;Plimer 1988;Appleby and Williams 1988;Beaty et al. 1988;Slack and Coad 1989;Bandyopadhyay et al. 1993).The relationships between tourmaline-rich rocks and metamorphic gold deposits have been documented in many metallogenic provinces, such as in the Precambrian of Ethiopia, Brazil, Mali, and Australia (Augustithis 1967; Fleischer and Routhier 1973;Dommanget et al. 1985;Plimer 1986), Caledonian rocks of southeastern Ireland (McArdle et al. 1989), and the Archaean Barberton sequence of South Africa (Byerly and Palmer 1991). Tourmaline is also a common hydrothermal gangue mineral in Archaean to Phanerozoic mesothermal and intrusion-related gold deposits (e.g. King 1988;Fuh 1990;Groves and Foster 1991;Nesbitt 1991).In northwestern Nigeria, tourmaline occurrences are widespread in Precambrian rocks, but more commonly are associated with Late Proterozoic metasedimentary belts (Russ 1957;McCurry 1971). Many areas of gold mineralization in Nigeria contain tourma...

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“…These tourmalinites may be compared with Proterozoic tourmalinites from the Golden Dyke dome, northern Australia (Plimer 1986). Proterozoic tourmalinites in the Rocky Mountains of North America (Ethier and Campbell 1977;Slack 1993), tourmalinites in parts of the Paleozoic Appalachian-Calidonian orogen (Slack 1982;Slack et al 1984;Taylor and Slack 1984;McArdle et al 1989), tourmalinites in the Broken Hill, New South Wales (Barnes 1983;Plimer 1988;Slack et al 1993), tourmalinites related to Zn-Pb-Cu-Ag-Au deposits in western Tasmania (Plimer and Lees 1988), and tourmalinites associated with Pb-Zn-Ag mineralization in the Apuane Alps, Italy (Benvenuti et al 1989). Such tourmalinites are generally regarded as indicators of massive sulfide mineralization (Slack 1982).…”

Section: Origin Of the Bedded Tourmalinitesmentioning

confidence: 99%

Tourmalinite from northern Guangxi, China

Mao

1995

Mineral. Deposita

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Abstract. The extensive development of tourmalinite is a feature that distinguishes the northern Guangxi polymetallic tin province of China from similar metallogenic provinces elsewhere. Two types of tourmalinite occur in the province. The first type, in the lower part of the Early Proterozoic Sibao Group, is bedded, stratiform or lenticular tourmalinite that shows well-developed laminated, gel, and degelatinized structures. Its mineral assemblage is very simple and the grain size ranges from 2 to 8 gm. This tourmaline is relatively rich in Mg, with an Fe/(Fe + Mg) ratio of 0.25-0.50.The second type of tourmalinite occurs as lodes distributed in the exocontact zone of Late Proterozoic biotite-granite intrusions. Its mineral assemblage is relatively complex; the tourmaline is present as euhedral or subhedral crystals ranging from 0.1 to 3.5 ram, mostly from 0.5 to 1 ram. This tourmaline commonly exhibits a radiating, zoned structure with Fe/(Fe + Mg) ratios of 0.64-0.79. It is suggested that the bedded tourmalinite formed by exhalation in an Early Proterozoic spreading-ridge environment, whereas the vein tourmalinite formed in a plate-convergence setting genetically associated with emplacement of Late Proterozoic biotite granite. As the tourmalinites themselves are related to mineralized rocks and orebodies, their origin and the related boron cycle of the region reflect to some extent the formation and evolution of the associated polymetallic tin deposits of the region.

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Tourmalinite as a potential host rock for gold in the Caledonides of Southeast Ireland

Cited by 13 publications

References 12 publications

Turmalinitos vulcanogênicos da formação Morro da Pedra Preta do Grupo Serra do Itaberaba (SP): petrografia, composição química da turmalina e implicações metalogenéticas

Turmalinitos vulcanogênicos da formação Morro da Pedra Preta do Grupo Serra do Itaberaba (SP): petrografia, composição química da turmalina e implicações metalogenéticas

Tourmalinization related to Late Proterozoic-Early Palaeozoic lode gold mineralization in the Bin Yauri area, Nigeria

Tourmalinite from northern Guangxi, China

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