Base Metal Sulfide Mineralization in Lower Carboniferous Strata, Northwest Ireland

Persellin, Christopher J.; Gregg, Jay M.; Shelton, Kevin L.; Somerville, Ian D.; Atekwana, Eliot A.

doi:10.2113/gsemg.19.1-2.35

Cited by 2 publications

(11 citation statements)

References 32 publications

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“…; Gleeson & Turner ; Persellin et al . ). Unfortunately, these types of studies are limited because they are indirect, and where similar T h and salinities are present it is not possible to distinguish among fluid compositions.…”

Section: Discussionmentioning

confidence: 97%

“…() and Persellin et al . () documented three distinct diagenetic fluids in cements from Lower Carboniferous rocks in Ireland, and Gleeson & Turner () distinguished four fluids in dolomite cements of the Pine Point Zn‐Pb district.…”

Section: Discussionmentioning

confidence: 99%

“…The documentation of multiple fluids or fluid events is commonly based on different T h or salinity values, as is the case in many carbonate-hosted Zn-Pb settings (e.g. Roedder 1968;Appold et al 1995;Chi & Savard 1995;Savard et al 2000;Banks et al 2002;Gleeson & Turner 2007;Persellin et al 2010). Unfortunately, these types of studies are limited because they are indirect, and where similar T h and salinities are present it is not possible to distinguish among fluid compositions.…”

Section: Implications Of Evaporate Mound Analysismentioning

confidence: 99%

“…The presence of multiple distinct fluids is not unusual in MVT settings. For example, both Johnson et al (2009) andPersellin et al (2010) documented three distinct diagenetic fluids in cements from Lower Carboniferous rocks in Ireland, and Gleeson & Turner (2007) distinguished four fluids in dolomite cements of the Pine Point Zn-Pb district.…”

Section: Wynniatt Formationmentioning

confidence: 99%

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A fluid inclusion study of diagenetic fluids in Proterozoic and Paleozoic carbonate rocks, Victoria Island, NWT

2013

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Despite the presence of known economic resources in Canada's Arctic archipelago, Victoria Island remains understudied. This study addresses the fluid history and economic potential of two major carbonate units on Victoria Island by integrating fluid inclusion microthermometry with SEM‐EDS analysis of evaporate mounds. Three cements containing fluid inclusion assemblages (FIA) occur in the Neoproterozoic Wynniatt Formation: saddle dolomite, brown dolomite and calcite, in paragenetic order. The two dolomite‐hosted cements have average homogenisation temperatures (Th) for FIAs (n = 3) of 108°C (saddle) and 101 and 116°C, but metastability precluded determining salinities; most calcite‐hosted fluid inclusions are too small and/or necked to obtain Th values, but rare larger inclusions have salinities from 1.7 to 0.4 wt. % NaCl equiv. SEM‐EDS analysis of evaporate mounds indicates the fluid changed from an early K‐rich (saddle dolomite), to a later K + Na (brown dolomite), and finally Na‐rich (calcite), which suggests mixing of two end‐member fluids (i.e. Na‐rich and K‐rich). Dolostone of the lower Paleozoic ‘Victoria Island formation’ contains two cements: early quartz and late dolomite. Quartz‐hosted FIAs (n = 2) have an average Th value of 126°C, and salinity of 23.2 wt. % NaCl equiv., whereas FIAs (n = 3) in dolomite have average Th values of 109, 116 and 124°C; metastability precluded determining salinity. Evaporate mound analysis for the cements indicates evolution from a Na‐rich to a Na + K fluid through interaction with reservoir rocks. A reduced, metal‐rich fluid was present during quartz precipitation, as implied by the presence of pyrite framboids along growth zones and nanoparticles of barite and sulphide minerals (Zn, Cu and Pb) in evacuated inclusions, which suggests the area may have potential to host base‐metal mineralisation. Importantly, distinguishing different fluid compositions in both of the case studies would not have been possible without evaporate mound analysis and therefore the results emphasise integrating this technique into diagenetic studies.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Implications Of Evaporate Mound Analysismentioning

confidence: 99%

Section: Wynniatt Formationmentioning

confidence: 99%

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A fluid inclusion study of diagenetic fluids in Proterozoic and Paleozoic carbonate rocks, Victoria Island, NWT

2013

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“…At Abbeytown Hitzman (1986) summarized the geology and history of the deposit and provided the initial fluid inclusion data. Later, Persellin (2009) and Persellin et al (2010) reported further detailed research which included stable isotope, cathode luminescence, further fluid inclusion work, and detailed petrographic studies. Both workers considered that the Abbeytown deposit has affinities similar to MVTs.…”

Section: Abbeytownmentioning

confidence: 99%

Irish, but not Irish-type

Andrew,

Stanley

2023

Irish-Type Zn-Pb Deposits Around the World

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Ireland is well known as a host to many carbonate-hosted zinc-lead deposits dating back to the discovery of the Tynagh deposit in 1961 which ushered in a prospecting rush which resulted in the discovery of several deposits and prospects, e.g., Ballinalack, Boston Hill, Carrickittle, Courtbrown, Harberton Bridge, Keel, Moyvoughly, Navan, Oldcastle and Silvermines. Research into understanding these deposits, in order to further advance successful exploration, initially adopted a Mississippi Valley Type model to direct exploration. How-ever, it soon became apparent that many of the deposits in Ireland did not fit this model and a new paradigm was needed. The term Irish-type was coined to more fully describe those deposits. However, there were some deposits that did not fit this new model notably Abbeytown, Allenwood, Boston Hill and Harberton Bridge (the latter three deposits collectively known as the Kildare District). Unlike most Irish-type deposits they strongly cross-cut the stratigraphy and have a vertical extent that is far greater than the lateral extent. Mineralogically they are significantly different with marcasite being the dominant iron sulphide. Plots of fluid inclusion data fall within fields separate to all the deposits in the Irish Midlands and are similar to the ranges of major MVT deposits from around the world. Similarly sulphur isotopic results show no evidence of the bacterial sulphate reduction that typify the Irish-type deposits and generally all fall with the range of “hydrothermal sulphur”. Fluid inclusion data is indicative of high salinity fluids enriched in chloride relative to bromide and suggests a component of salinity derived via dissolution of halite or from evaporation of seawater. Therefore, the region in which these fluids formed should contain evidence of halite. In this paper we describe the geological features of these deposits and critically assess the evidence which permits us to assign these deposits to the Mississippi Valley class of deposits – notwithstanding that clearly, they are geographically Irish, but they do not possess the typical diagnostic characteristics of Irish-type Zn-Pb deposits.

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Base Metal Sulfide Mineralization in Lower Carboniferous Strata, Northwest Ireland

Cited by 2 publications

References 32 publications

A fluid inclusion study of diagenetic fluids in Proterozoic and Paleozoic carbonate rocks, Victoria Island, NWT

A fluid inclusion study of diagenetic fluids in Proterozoic and Paleozoic carbonate rocks, Victoria Island, NWT

Irish, but not Irish-type

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