Geological Setting of Tantalum-Bearing Mineralization in the Caledonides of SE Ireland

McArdle, P.; Kennan, P. S.

doi:10.1007/978-3-642-87262-4_10

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…All records of Au show that it is directly associated with the ORS-hosted Cu mineralisation, although the majority of accounts are historical mining reports of very dubious accuracy (McArdle et al . 1987; Cowman & Reilly 1988) and the modest grade of most (Reilly 1986; Cowman & Reilly 1988; Pracht & Sleeman 2002 and references therein) do not favour the region as a potential source of prehistoric Au.…”

Section: Discussionmentioning

confidence: 99%

A Non-local Source of Irish Chalcolithic and Early Bronze Age Gold

Standish

Dhuime²,

Hawkesworth³

et al. 2015

Proc. Prehist. Soc.

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Lead isotope analyses of 50 Irish Chalcolithic and Early Bronze Age gold artefacts favour a gold source in southern Ireland. However when combined with major element analysis, the artefacts are not consistent with any Irish gold deposit analysed to date. Understanding the lead isotope signatures of ore deposits within a study region allows informed inferences to be drawn regarding the likelihood that an unanalysed ore deposit was exploited in the past. If an Irish gold source is assumed, then the gold is most likely to have originated from deposits hosted by Old Red Sandstone in the Variscan ore field of south-west Ireland. However, based on our current understanding of mineralisation in the region, this scenario is considered unlikely. A non-Irish source for the gold is therefore preferred – a scenario that may favour cosmologically-driven acquisition, ie, the deliberate procurement of a material from distant or esoteric sources. Available geochemical data, combined with current archaeological evidence, favour the alluvial deposits of south-west Britain as the most likely source of the gold.

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Section: Discussionmentioning

confidence: 99%

A Non-local Source of Irish Chalcolithic and Early Bronze Age Gold

Standish

Dhuime²,

Hawkesworth³

et al. 2015

Proc. Prehist. Soc.

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“…The South Mayo Trough is identified as the South Mayo Terrane (SMT) in the tectonic mosaic forming the Caledonian belt of NW Ireland and Scotland (Hutton 1987). It can be broadly correlated with the ophiolitearc/trough terranes of Cambro-Ordovician age in central Graham et al 1989;McArdle 1989, Thompson et al 1992 Newfoundland. The SMT is believed to have originated as a north-facing forearc basin which was founded on a Tremadocian ophiolitic basement over a south-dipping subduction zone active during Arenig-Llanvirn times (Dewey and Ryan 1990).…”

Section: Geological Backgroundmentioning

confidence: 97%

Listvenite and related rocks: perspectives on terminology and mineralogy with reference to an occurrence at Cregganbaun, Co. Mayo, Republic of Ireland

1995

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Abstract. The rock 'listvenite' is named and defined by reference to historical observations and recommendations are made so that listvenite (s.s.) can be distinguished from related carbonate-rich alteration products of ultramafic rocks. The mineralogy and tectonic setting of listvenite are reviewed, taking into account the descriptions and classifications used in the literature. The petrography of listvenite and related rocks at Cregganbaun serves as a reference to illustrate the characteristics of true listvenite and closely related products of listvenitic alteration.During the 150 years since the term 'listwiinite' was first introduced by Rose (1837Rose ( , 1842, much has been written on the topic by Russian field geologists and researchers (Krotov 1915;Lodochnikov 1936;Borodayevskiy and Borodayevskiy 1947;Korzhinskii 1953;Bok 1956;Ploshko 1963; Allakhverdiev 1965, 1971;Shcherban 1967;Shcherban and Borovikova 1969;Goncharenko 1970, Sazonov 1975Abovian 1978; Kuleshevich 1984;Spiridonov 1991). Listvenites and the criteria by which they are defined have more recently become a concern of geologists elsewhere Buisson and Leblanc 1985a, 1985b, 1987Aydal 1989;Ash and Arksey 1990a, 1990b, 1990cMadu et al. 1990;Nixon 1990;Ashley and Brownlow 1993;Auclair et al. 1993) due to their spatial and temporal association with gold deposits of mesothermal type in eugeoclinal terranes worldwide. There are problems concerning the strict definition of 'listw;nite' and also regarding the correct spelling of the word. This is evident in the idiosyncratic transliterations from Russian into other languages. Various spellings can be found e.g. listwaenite, listwanite, listvanite and listvenite. This confusion has arisen because of the free phonetic interpretation of the original transliteration from Russian to German given by Rose (1842). The geological section through the Urals given by Murchison et al. (1845) shows the type locality for listvenite, Listvenya Gora (Larch Hill). The root of the name listvenite is found in the Russian name for the larch tree. In a direct transcription from Cyrillic to English, the correct spelling is therefore 'listvenite'.In order to understand the processes governing the gold mineralization found in association with listvenite, it is also necessary to understand the process of listvenitization. However, a review of the literature shows that the term 'listvenite' is used to describe a diversity of carbonate-rich rocks produced by alteration of mafic-ultramafic bodies. The aim of the present contribution is to re-establish the identity of listvenite in the sense of the original description given by Rose (1837Rose ( , 1842 and to review the current classifications of listvenite and related rocks, using examples from Cregganbaun, Ireland to illustrate the characteristics of true listvenite and associated types of alteration. Characteristics of listvenite The historical problemSince the term 'listvenite' was first introduced to the literature of mineralogy by Rose (1837Rose ( , 1842, the usage of the wor...

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“…Many Irish gold localities have been, are being, or have the potential to be, exploited (McArdle 1989). Their number and history of exploitation contrasts sharply with the paucity of tin in Ireland.…”

Section: Sources Of Tin In Irelandmentioning

confidence: 99%