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Zn-Pb mineralisation in the Silvermines district, Ireland: a product of burial diagenesis

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Abstract

Carbonate-sulphide cement stratigraphic relationships in the host rock and ore have been used to constrain the age of mineralisation at the Silvermines zinc-lead-barium deposit. The base-metal sulphides post-date planar dolomite and replace stylolites. Furthermore, the pre-mineralisation planar dolomites also replace stylolites. These and other diagenetic observations indicate that the base-metal sulphides formed at burial depths greater than 800 m, but probably predate the Variscan deformation (since pressure shadows overgrow base metal sulphides). This indicates that the sulphides are of epigenetic origin, constraining the age of mineralisation to between the late Chadian (≈347 Ma) and the late Westphalian (≈307 Ma). However, the most likely age for mineralisation, (based on widespread macro-stylolite development) is Asbian (≈339 Ma) or younger. No evidence of synsedimentary sulphides (in the form of hydrothermal chimneys, vent faunas, or sulphides intergrown with marine cements) was observed at Silvermines. Mineralised breccias (black matrix breccias), late-stage internal sediments, and dissolution zones within the carbonate cements all appear to be produced by hydrothermal karsting that occurred during the mineralisation process. Fluid inclusion homogenisation temperatures for ore-stage calcites (up to 300 °C) approach the peak temperature estimates derived from regional maturation parameters (270 to 310 °C from conodont alteration indices and vitrinite reflectance). This suggests that homogenisation temperatures represent maximum heating temperatures (probably during Variscan time) rather than mineralisation temperatures.

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References

  • Andrew CJ (1986) The tectono-stratigraphic controls to mineralization in the Silvermines area, County Tipperary, Ireland. In: Andrew CJ, Crowe RWA, Finlay S, Pennell WM, Pyne JF (eds) Geology and genesis of mineral deposits in Ireland. Irish Assoc Econ Geol, pp 377–417

  • Andrew CJ (1995) The Silvermines district, Co. Tipperary, Ireland. In: Anderson IK, Ashton J, Earls G, Hitzman M, Tear S (eds) Irish carbonate-hosted Zn-Pb deposits. Soc Econ Geol, pp 247–258

  • Archer JB, Sleeman, AG, Smith DC (1996) A geological description of Tipperary and adjoining parts of Laois, Kilkenny, Offaly, Clare and Limerick, to accompany the Bedrock Geology 1:100,000 Scale Map Series, Sheet 18, Tipperary, with contributions by K. Claringbold, G. Stanley (Mineral Resources) and G. Wright (Groundwater Resources). Geol Surv Ireland, pp 77

  • Banks DA, Boyce AJ, Samson IM (2002) Constraints on the origins of fluids forming Irish Zn-Pb-Ba deposits: evidence from the composition of fluid inclusions. Econ Geol 97:471–480

    CAS  Google Scholar 

  • Barnaby RJ, Rimstidt JD (1989) Redox conditions of calcite cementation interpreted from Mn and Fe contents of authigenic calcites. Geol Soc Am Bull 101:795–804

    CAS  Google Scholar 

  • Barnaby RJ, Read JF (1992) Dolomitization of a carbonate platform during late burial: Lower to Middle Cambrian Shady Dolomite, Virginia Appalachians. J Sediment Petrol 62 (6):1023–1043

    CAS  Google Scholar 

  • Boyce AJ, Coleman ML, Russell MJ (1983) Formation of fossil hydrothermal chimneys and mounds from Silvermines, Ireland. Nature 306:545–550

    CAS  Google Scholar 

  • Boyce AJ, Fallick AE, Little CTS, Wilkinson JJ Everett CE (1999) A hydrothermal vent tube worm in the Ballynoe baryte deposit, Silvermines, Ireland: implications for timing and ore genesis. In: Stanley CJ, Rankin AH, Bodnar RJ, Naden J, YardleyBWD, Criddle AJ, Hagni RD, Gize AP, Pasava J, Fleet AJ, Seltmann R, Halls C, Stemprok M, Williamson B, Herrington RJ, Hill RET, Prichard HM, Wall F, Williams CT, McDonald I, Wilkinson JJ, Cooke D, Cook NJ, Marshall BJ, Spry P, Zaw K, Meinert L, Sundblad K, Scott PW, Clark SHB, Valsami-Jones E, Beukes NJ, Stein HJ, Hannah HJ, Neubauer F, Blundell DJ, Alderton DHM, Smith MP, Mulshaw S and Ixer RA (eds) Mineral deposits: processes to processing. Balkema, Rotterdam, pp 825–827

  • Brück PM (1982) The regional lithostratigraphical setting of the Silvermines zinc-lead and the Ballynoe barite deposits, Co. Tipperary. In: (eds) Mineral exploration in Ireland—Progress and developments 1971–1981, Irish Assoc Econ Geol, pp 162–170

  • Brückschen P, Veizer J (1997) Oxygen and carbon isotopic composition of Dinantian brachiopods: paleoenvironmental implications for the Lower Carboniferous of western Europe. Palaeogeogr Palaeoclimatol Palaeoecol 132:243–264

    Article  Google Scholar 

  • Choquette PW, James NP (1987) Diangenesis #12. Diagenesis in Limestones - 3. The deep burial environment. Geosci Can 14:3–35

    Google Scholar 

  • Clayton G, Haughey N, Sevastopulo GD, Burnett R (1989) Thermal maturation levels in the Devonian and Carboniferous rocks of Ireland. Geol Surv Ireland, 36 pp

  • Coller DW (1984) Variscan structures in the Upper Palaeozoic rocks of west central Ireland. In: Hutton DHW, Sanderson DJ (eds) Variscan tectonics of the north Atlantic region. Geol Soc Lond Spec Publ 14, pp 185–194

  • Derry DR, Clark GR, Gillatt N (1965) The Northgate base-metal deposit at Tynagh, County Galway, Ireland: a preliminary geological study. Econ Geol 60:1218–1237

    CAS  Google Scholar 

  • Doyle E, Bowden AA, Jones GV, Staley GA (1992) The geology of the Galmoy zinc-lead deposits, Co. Kilkenny. In: Bowden AA, Earls G, O’Connor PG, Pyne JF (eds) The Irish minerals industry 1980–1990. Irish Assoc Econ Geol, pp 211–225

  • Everett CE, Wilkinson JJ, Rye DM (1999) Fracture-controlled fluid flow in the Lower Palaeozoic basement rocks of Ireland: implications for the genesis of Irish-type Zn-Pb deposits. In: McCaffrey KJW, Lonergan L, Wilkinson JJ (eds) Fractures, fluid flow and mineralisation. Geol Soc Lond Spec Publ 155, pp 247–276

  • Everett CE, Rye DM, Ellam RM (2003) Source or sink? An assessment of the role of the Old Red Sandstone in the genesis of the Irish Zn-Pb deposits. Econ Geol 98(1):31–50

    CAS  Google Scholar 

  • Fitzgerald E, Feely M, Johnston JD, Clayton G, Fitzgerald LJ, Sevastopulo GD (1994) The Variscan thermal history of west Clare, Ireland. Geol Mag 131(4):545–558

    Google Scholar 

  • Frank MH, Carpenter AB, Oglesby TW (1982) Cathodoluminescence and composition of calcite cement in Taum Sauk Limestone (Upper Cambrian), southeast Missouri. J Sediment Petrol 52:631–638

    CAS  Google Scholar 

  • Goldstein RH, Reynolds TJ (1994) Systematics of fluid inclusions in diagenetic minerals. SEPM Short Course 31, pp 199

  • Gregg JM, Shelton KL, Johnson AW, Somerville ID, Wright WR (2001) Dolomitisation of the Waulsortian Limestone (Lower Carboniferous) in the Irish Midlands. Sedimentology 48:745–766

    Article  CAS  Google Scholar 

  • Harland WB, Armstrong RL, Cox AV, Craig LE, Smith AG, Smith DG (1990) A geologic time scale, 1989. Cambridge University Press, New York, 263 pp

  • Hendry JP (1993) Calcite cementation during bacterial manganese, iron and sulphate reduction in Jurassic shallow marine carbonates. Sedimentology 40:87–106

    CAS  Google Scholar 

  • Hitzman MW, Large D (1986) A review and classification of the Irish carbonate-hosted base metal deposits. In: Andrew CJ, Crowe RWA, Finlay S, Pennell WM, Pyne JF (eds) Geology and genesis of mineral deposits in Ireland. Irish Assoc Econ Geol, pp 217–238

  • Hitzman MW, O’Connor P, Shearley E, Schaffalitzky C, Beaty DW, Allan JR, Thompson T (1992) Discovery and geology of the Lisheen Zn-Pb-Ag prospect, Rathdowney Trend, Ireland. In: Bowden AA, Earls G, O’Connor PG, Pyne JF (eds) The Irish minerals industry 1980–1990. Irish Assoc Econ Geol, pp 227–246

  • Hitzman MW, Beaty DW (1996) The Irish Zn-Pb-(Ba) orefield. In: Sangster DF (eds) Carbonate-hosted lead-zinc deposits. Soc Econ Geol, pp 112–143

  • Hitzman MW (1999) Extensional faults that localise Irish syndiagenetic Zn-Pb deposits and their reactivation during Variscan compression. In: McCaffrey KJW, Lonergan L, Wilkinson JJ (eds) Fractures, fluid flow and mineralisation. Geol Soc Lond Spec Publ 155, pp 233–245

  • Hitzman MW, Redmond PB, Beaty DW (2002) The carbonate-hosted Lisheen Zn-Pb-Ag deposit, County Tipperary, Ireland. Econ Geol 97:1627–1656

    CAS  Google Scholar 

  • James NP, Choquette PW (1984) Diagenesis 6. Limestones—the sea floor diagenetic environment. Geosci Can 10:162–179

    Google Scholar 

  • Johnston JD (1999) Regional fluid flow and the genesis of Irish Carboniferous base metal deposits. Miner Deposita 34:571–598

    CAS  Google Scholar 

  • Jones GL (1987) Irish carboniferus conodonts record maturation levels and the influence of tectonism, igneous activity and mineralization. Terra Nova 4:238–244

    Google Scholar 

  • Larter RCL, Boyce AJ, Russell MJ (1981) Hydrothermal pyrite chimneys from the Ballynoe Baryte deposit, Silvermines, County Tipperary, Ireland. Miner Deposita 16:309–318

    Google Scholar 

  • Lee MJ, Wilkinson JJ, Earls G (2001) Textural and cathodoluminescence evidence for the origin of black matrix breccias in the Irish Zn-Pb orefield. In: Piestrzynski AEA (ed) Mineral deposits at the beginning of the 21st century. Balkema, Rotterdam, pp 161–164

  • Lee MJ, Wilkinson JJ (2002) Cementation, hydrothermal alteration, and Zn-Pb mineralization of carbonate breccias in the Irish Midlands: textural evidence from the Cooleen Zone, near Silvermines, County Tipperary. Econ Geol 97:653–662

    CAS  Google Scholar 

  • Lees A, Miller J (1995) Waulsortian banks. In: Monty CLV, Bosence DWJ, Bridges PH, Pratt BR (eds) Carbonate mud-mounds—Their origin and evolution. Blackwell Science, Oxford, pp 191–273

  • Lind IL (1993) Stylolites in chalk from leg130, Ontong Java Plateau. Proceedings of the Ocean Drilling Program, Scientific Results 130:445–451

  • Machel HG (1985) Cathodoluminescence in calcite and dolomite and its chemical interpretation. Geosci Can 12(4):139–147

    Google Scholar 

  • Meyers WJ, Lohmann KC (1978) Microdolomite-rich syntaxial cements: proposed meteoric-marine mixing zone phreatic cements from Mississippian limestones, New Mexico. J Sediment Petrol 48:475–488

    CAS  Google Scholar 

  • Meyers WJ, Lohmann KC (1985) Isotope geochemistry of regionally extensive calcite cement zones and marine components in Mississipian Limestones, New Mexico. In: Schneidermann N, Harris PM (eds) Carbonate cements. Soc Econ Paleontol Mineral, pp 223–239

  • Miller J (1986) Facies relations and diagenesis in Waulsortian mudmounds from the Lower Carboniferous of Ireland and N. England. In: Schroeder JH, Purser BH (eds) Reef diagenesis. Springer, Berlin Heidelberg New York, pp 311–335

  • Moss S, Tucker ME (1995) Diagenesis of Barremian-Aptian carbonates (the Urgonian Limestone Formation of SE France): near-surface and shallow-burial diagenesis. Sedimentology 42:853–874

    CAS  Google Scholar 

  • Mullane MM, Kinnaird JA (1998) Synsedimentary mineralisation at Ballynoe barite deposit, near Silvermines, Co. Tipperary, Ireland. Trans Inst Min Metall (Sect B: Appl Earth Sci) 107:48–61

    Google Scholar 

  • Nicolaides S, Wallace MW (1997) Pressure-dissolution and cementation in an Oligo-Miocene non-tropical limestone (Clifton Formation), Otway Basin, Australia. In: James NP, Clarke JAD (eds) Cool-water carbonates. Soc Econ Paleontol Mineral, pp 249–261

  • Peace WM, Wallace MW (2000) Timing of mineralisation at the Navan Zn-Pb deposit: a post-Arundian age for Irish mineralisation. Geology 28(8):711–714

    CAS  Google Scholar 

  • Peace WM, Wallace MW, Holdstock MP, Ashton JH (2003) Ore textures within the U lens of the Navan Zn-Pb deposit, Ireland: Miner Deposita, DOI 10.1007/s00126-002-0340-1

  • Playford PE, Wallace MW (2001) Exhalative mineralization in Devonian Reef Complexes of the Canning Basin, Western Australia. Econ Geol 96:1595–1610

    CAS  Google Scholar 

  • Prezbindowski DR (1985) Burial cementation—is it important? A case study, Stuart City Trend, South Central Texas. In: Schneidermann N, Harris PM (eds) Carbonate cements. Soc Econ Paleontol Mineral, pp 241–264

  • Reed CP, Wallace MW (2001) Diagenetic evidence for an epigenetic origin of the Courtbrown Zn-Pb deposit, Ireland. Miner Deposita 36(5):428–441

    CAS  Google Scholar 

  • Reed CP, Wallace MW (2003) Cementation, hydrothermal alteration, and Zn-Pb mineralization of carbonate breccias in the Irish Midlands: textural evidence from the Cooleen Zone, near Silvermines, County Tipperary: a discussion. Econ Geol 98(1):191–198

    CAS  Google Scholar 

  • Rhoden HN (1958) Structure and economic mineralization of the Silvermines District, Co. Tipperary, Ireland. Trans Inst Min Metall (Sect B: Appl Earth Sci) 92:67–71

    Google Scholar 

  • Rhoden HN (1960) Mineralogy of the Silvermines district, Co. Tipperary, Eire. Mineral Mag 32:128–139

    Google Scholar 

  • Samson IJ, Russell MJ (1987) Genesis of the Silvermines zinc-lead-barite deposit, Ireland: fluid inclusion and stable isotope evidence. Econ Geol 82:371–394

    CAS  Google Scholar 

  • Scholle PA, Halley RB (1985) Burial diagenesis: out of sight, out of mind! In: Schneidermann N, Harris PM (eds) Carbonate cements. SEPM Spec Publ No 36, pp 309–334

  • Schultz RW (1966) The Northgate base-metal deposit at Tynagh, County Galway, Ireland: discussion. Econ Geol 61:1443–1449

    CAS  Google Scholar 

  • Sevastopulo GD, Wyse Jackson PN (2001) Carboniferous (Dinantian). In: Holland CH (ed) The geology of Ireland. Dunedin Academic Press, Edinburgh, pp 241–288

  • Shearley E, Redmond P, King M, Goodman R (1996) Geological controls on mineralisation and dolomitisation of the Lisheen Zn-Pb-Ag deposit, Co. Tipperary, Ireland. In: Strogen P, Somerville ID, Jones GL (eds) Recent advances in Lower Carboniferous geology. Geol Soc Lond Spec Publ 107, pp 23–33

  • Taylor S, Andrew CJ (1978) Silvermines orebodies, County Tipperary, Ireland. Trans Inst Min Mineral (Sect B: Applied Earth Sci) 87:111–124

    Google Scholar 

  • Taylor S (1984) Structural and paleotopographic controls of lead-zinc mineralization in the Silvermines orebodies, Republic of Ireland. Econ Geol 79:529–548

    CAS  Google Scholar 

  • Tobin KJ, Walker KR, Goldberg SG (1997) Burial diagenesis of middle Ordovician carbonate buildups (Alabama, USA): documentation of the dominance of shallow burial conditions. Sediment Geol 114:223–236

    Article  CAS  Google Scholar 

  • Tobin RC, Claxton BL (2000) Multidisciplinary thermal maturity studies using vitrinite reflectance and fluid inclusion microthermometry: a new calibration of old techniques. AAPG Bull 84 (10):1647–1665

    Google Scholar 

  • Tucker ME (1991) Sedimentary petrology: an introduction to the origin of sedimentary rocks. Blackwell Scientific, London, 260 pp

    Google Scholar 

  • Wallace MW, Kerans C, Playford PE, McManus A (1991) Burial diagenesis in the Upper Devonian reef complexes of the Geikie Gorge Region, Canning Basin, Western Australia. Am Assoc Pet Geol Bull 75(6):1018–1038

    CAS  Google Scholar 

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Correspondence to Christopher P. Reed.

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Reed, C.P., Wallace, M.W. Zn-Pb mineralisation in the Silvermines district, Ireland: a product of burial diagenesis. Miner Deposita 39, 87–102 (2004). https://doi.org/10.1007/s00126-003-0384-x

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