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Arc–Continent Collision in the Ordovician of Western Ireland: Stratigraphic, Structural and Metamorphic Evolution

  • P. D. Ryan
  • J. F. Dewey
Chapter
Part of the Frontiers in Earth Sciences book series (FRONTIERS)

Abstract

The geology of western Ireland preserves a record of the collision of the Lough Nafooey arc with the Laurentian margin which caused the mid-Ordovician Grampian Orogeny. Remarkably, a basin, the South Mayo Trough, accumulated some 9 km of sedimentary and volcanic rocks before, during and after this event. Thrusting, believed to be during the post-Grampian change in subduction polarity, exhumed high to medium grade Barrovian metamorphic rocks of the footwall which lie to both the north (North Mayo) and south (Connemara) of this basin. This article reviews: the evidence for this being considered an arc–continent collision zone; the relative timing of events in the upper and lower plates; the structure of the crust within this zone; and the associated gold mineralisation. The stratigraphic and volcanic response of the system to the collision is then discussed in the light of a compilation of some 533 geochemical analyses. An attempt is made to assign absolute ages to the fossiliferous stratigraphic units within the South Mayo Trough using a recently published high-resolution Ordovician time scale. This analysis suggests that the initial “soft” collision took place over about 7 Myr, “hard” collision lasted for a further 6 myr, whilst polarity reversal may have taken <1 myr. Uplift and collapse of the orogen lasted over 9 myr. The possible causes of the suppression of topography which allowed the basin to remain below sea-level during this collision are primarily thought to be due to the nature of the Laurentian margin coupled with high sea levels and dense basin fill. The metamorphism of the footwall to high grade Barrovian assemblages is attributed to heating from an ophiolite-arc nappe.

Keywords

Detrital Zircon Accretionary Prism Active Continental Margin Late Ordovician Volcanic Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We would like to thank Maria A. Mange for help with drafting Fig. 13.6. and Amy E. Draut and Peter D. Clift for supplying original geochemical data files used in preparing Figs. 13.10 and 13.11.

References

  1. Alsop GI, Hutton DHW (1993) Caledonian extension in the north Irish Dalradian: implications for the timing and activation of gravity collapse. J Geol Soc 150(1):33–36CrossRefGoogle Scholar
  2. Archer JB (1977) Llanvirn stratigraphy of the Galway-Mayo border area, western Ireland. Geol J 12:77–98CrossRefGoogle Scholar
  3. Archer JB (1984) Clastic intrusions in deep-sea fan deposits of the Rosroe Formation, Lower Ordovician, western Ireland. J Sediment Petrol 54:1197–1205Google Scholar
  4. Brown D, Huang CY (2009) Arc-continent collision. Tectonophysics 479(1–2):1–3CrossRefGoogle Scholar
  5. Brown C, Whelan J (1995) Terrane boundaries in Ireland inferred from the Irish Magnetotelluric Profile and other geophysical data. J Geol Soc 152(3):523–534CrossRefGoogle Scholar
  6. Chew DM (2003) Structural and stratigraphic relationships across the continuation of the Highland Boundary Fault in western Ireland. Geol Mag 140(1):73–85CrossRefGoogle Scholar
  7. Chew DM, Daly JS, Page LM, Kennedy MJ (2003) Grampian orogenesis and the development of blueschist-facies metamorphism in western Ireland. J Geol Soc 160(6):911–924Google Scholar
  8. Chew DM, Graham JR, Whitehouse MJ (2007) U-Pb zircon geochronology of plagiogranites from the Lough Nafooey (= Midland Valley) arc in western Ireland: constraints on the onset of the Grampian orogeny. J Geol Soc 164(4):747–750CrossRefGoogle Scholar
  9. Clift PD, Ryan PD (1994) Geochemical evolution of an Ordovician island arc, South Mayo, Ireland. J Geol Soc 151(2):329–342CrossRefGoogle Scholar
  10. Clift PD, Dewey JF, Draut AE, Chew DM, Mange M, Ryan PD (2004) Rapid tectonic exhumation, detachment faulting and orogenic collapse in the Caledonides of western Ireland. Tectonophysics 384:91–113CrossRefGoogle Scholar
  11. Clift PD, Carter A, Draut AE, Long HV, Chew DM, Schouten HA (2009) Detrital U/Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides. In: Brown D, Huang CY (eds) Tectonophysics 479:165–174Google Scholar
  12. Condon DJ, Prave AR (2000) Two from Donegal: Neoproterozoic glacial episodes on the northeast margin of Laurentia. Geology 28(10):951–954CrossRefGoogle Scholar
  13. Cooper MJ, Crowley QG, Rushton AWA (2008) New age constraints for the Ordovician Tyrone Volcanic Group, Northern Ireland. J Geol Soc 165(1):333–339CrossRefGoogle Scholar
  14. Cox W (2005) Finding gold in Ireland: past, present and future. Extractive industry in Ireland, Newsletter 146:1–3Google Scholar
  15. Daly JS (1996) Pre-Caledonian history of the Annagh gneiss complex, north-western Ireland, and correlation with Laurentia-Baltica. Ir J Earth Sci 15:5–18Google Scholar
  16. Daly JS (2001) The Precambrian. In: Holland G (ed) The geology of Ireland, 2nd edn. Scottish Academic Press, Edinburgh, pp 7–44Google Scholar
  17. Daly JS, Flowerdew MJ (2005) Grampian and late Grenville events recorded by mineral geochronology near a basement-cover contact in north Mayo, Ireland. J Geol Soc 162(1):163–174CrossRefGoogle Scholar
  18. Dewey JF (1963) The lower Palaeozoic stratigraphy of central Murrisk, County Mayo, Ireland, and the evolution of the south Mayo Trough. Q J Geol Soc Lond 119:313–344CrossRefGoogle Scholar
  19. Dewey JF (2005) Orogeny can be very short. Proc Natl Acad Sci USA 102(43):15286–15293CrossRefGoogle Scholar
  20. Dewey J, Mange M (1999) Petrography of Ordovician and Silurian sediments in the western Irish Caledonides: tracers of a short-lived Ordovician continent-arc collision orogeny and the evolution of the Laurentian Appalachian-Caledonian margin. In: MacNiocaill C, Ryan PD (eds) Continental tectonics, vol 164. Geological Society London Special Publications, London, pp 55–107Google Scholar
  21. Dewey JF, Ryan PD (1990) The Ordovician evolution of the South Mayo Trough, western Ireland. Tectonics 9(4):887–901CrossRefGoogle Scholar
  22. Dewey JF, Shackleton RM (1984) A model for the evolution of the Grampian tract in the early Caledonides and Appalachians. Nature (Lond) 312:115–121CrossRefGoogle Scholar
  23. Dewey JF, McKerrow WS, Moorbath S (1970a) The relationship between isotopic ages, uplift and sedimentation during Ordovician times in western Ireland. Scot J Geol 6(2):133–145CrossRefGoogle Scholar
  24. Dewey JF, Rickards RB, Skevington D (1970b) New light on the age of Dalradian deformation and metamorphism in western Ireland. Norsk Geologisk Tidsskrift. Supplement 50(1):19–44Google Scholar
  25. Draut AE, Clift PD (2001) Geochemical evolution of arc magmatism during arc-continent collision, South Mayo, Ireland. Geology 29(6):543–546CrossRefGoogle Scholar
  26. Draut AE, Clift PD (2002) The origin and significance of the Delaney Dome Formation, Connemara, Ireland. J Geol Soc 159(1):95–103CrossRefGoogle Scholar
  27. Draut AE, Clift PD, Hannigan RE, Layne G, Shimizu N (2002) A model for continental crust genesis by arc accretion; rare earth element evidence from the Irish Caledonides. Earth Planet Sci Lett 203(3–4):861–877CrossRefGoogle Scholar
  28. Draut AE, Clift PD, Chew DM, Cooper MJ, Taylor RN, Hannigan RE (2004) Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland. Geol Mag 141(2):195–207CrossRefGoogle Scholar
  29. Draut AE, Clift PD, Amato JM, Blusztajn J, Schouten H (2009) Arc-continent collision and the formation of continental crust – a new geochemical and isotopic record from the Ordovician Tyrone Igneous Complex, Ireland. J Geol Soc Lond 166:485–500CrossRefGoogle Scholar
  30. England PC, Thompson AB (1984) Pressure-temperature-time paths of regional metamorphism, I. Heat transfer during the evolution of regions of thickened continental crust. J Petrol 25(4):894–928CrossRefGoogle Scholar
  31. Ffrench GD, Williams DM (1984) The sedimentology of the South Connemara Group, western Ireland; a possible Ordovician trench-fill sequence. Geol Mag 121(5):505–514CrossRefGoogle Scholar
  32. Flowerdew MJ, Daly JS, Whitehouse MJ (2005) 470 Ma granitoid magmatism associated with the Grampian Orogeny in the Slishwood Division, NW Ireland. J Geol Soc Lond 162:563–575CrossRefGoogle Scholar
  33. Flowerdew MJ, Chew DM, Daly JS, Millar IL (2009) Hidden Archaean and Palaeoproterozoic crust in NW Ireland? Evidence from zircon Hf isotopic data from granitoid intrusions. Geol Mag 146(6):903–916CrossRefGoogle Scholar
  34. Friedrich AM (1998) 40Ar/39Ar and U-Pb geochronological constraints on the thermal and tectonic evolution of the Connemara Caledonides, Doctoral Thesis. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyGoogle Scholar
  35. Friedrich AM, Bowring SA, Martin MW, Hodges KV (1999a) Short-lived continental magmatic arc at Connemara, western Irish Caledonides: implications for the age of the Grampian orogeny. Geology 27:27–30CrossRefGoogle Scholar
  36. Friedrich AM, Hodges KV, Bowring SA, Martin MW (1999b) Geochronological constraints on the magmatic, metamorphic and thermal evolution of the Connemara Caledonides, western Ireland. J Geol Soc 156(6):1217–1230CrossRefGoogle Scholar
  37. Gorton MP, Schandl ES (2000) From continents to island arcs: a geochemical index of tectonic setting for arc-related and within-plate felsic to intermediate volcanic rocks. Can Mineralog 38(5):1065–1073CrossRefGoogle Scholar
  38. Graham JR, Leake BE, Ryan PD (1989) The geology of South Mayo, western Ireland. Scottish Academic Press, EdinburghGoogle Scholar
  39. Graham JR, Wrafter JP, Daly JS, Menuge JF (1991) A local source for the Ordovician Derryveeny Formation, western Ireland; implications for the Connemara Dalradian. In: Morton AC, Todd SP, Haughton PDW (eds) vol 57. Geological Society Special Publications, pp 199–213Google Scholar
  40. Gray JR, Yardley B (1979) A Caledonian blueschist from the Irish Dalradian. Nature 278:736–737CrossRefGoogle Scholar
  41. Gromet LP, Dymek RF, Haskin LA, Korotev RL (1984) The “North American shale composite”; its compilation, major and trace element characteristics. Geochim Cosmochim Acta 48(12):2469–2482CrossRefGoogle Scholar
  42. Gwo W, Yu-Chia C (1994) Sedimentation rates on the continental slope off eastern Taiwan. Mar Geol 119(1–2):99–109CrossRefGoogle Scholar
  43. Haq B, Hardenbol J, Vail P (1987) “Chronology of fluctuating sea levels since the Triassic”. Science 235(4793):1156–1167CrossRefGoogle Scholar
  44. Harkin J, Williams DM, Menuge JF, Daly JS (1996) Turbidites from the Clew Bay Complex, Ireland; provenance based on petrography, geochemistry and crustal residence values. Geol J 31(4):379–388CrossRefGoogle Scholar
  45. Harper DAT, Parkes MA (2000) Terranes in the British and Irish Ordovician: a revised correlation of Ordovician Rocks in the British Isles. Geol Soc Lond Spec Rep 24:30–40Google Scholar
  46. Harper DAT, Parkes MA, McConnell BJ (2010) Late Ordovician (Sandbian) brachiopods from the Mweelrea Formation, South Mayo, western Ireland: stratigraphic and tectonic implication. Geol J 45(4):445–450Google Scholar
  47. Harris AL, Baldwin CT, Bradbury HJ, Johnson HD, Smith RA (1978) Ensialic basin sedimentation: the Dalradian Supergroup. In: Bowes DR, Leake BE (eds) Crustal evolution in northwest Britain and adjacent regions. Special Issue Geological Journal, 10:115–138Google Scholar
  48. Harris DHM (1995) Caledonian transpressional terrane accretion along the Laurentian margin in Co. Mayo, Ireland. J Geol Soc 152(5):797–806CrossRefGoogle Scholar
  49. Hastie AR, Kerr AC, Pearce JA, Mitchell SF (2007) Classification of altered volcanic island arc rocks using immobile trace elements: development of the Th Co discrimination diagram. J Petrol 48(12):2341CrossRefGoogle Scholar
  50. Huang C-Y, Chiu Y-L, Meixum Z (2005) Core description and a preliminarily sedimentology study of site 1202D, Leg 195, in the southern Okinawa Trough. Terr Atmos Oceanic Sci 16(1):19–44Google Scholar
  51. Huh C, Lin H, Lin S, Huang Y (2009) Modern accumulation rates and a budget of sediment off the Gaoping (Kaoping) River, SW Taiwan: a tidal and flood depositional environment around a submarine canyon. J Mar Syst 76(4):405–416CrossRefGoogle Scholar
  52. Hutton DHW (1987) Strike-slip terranes and a model for the evolution of the British and Irish Caledonides. Geol Mag 124(5):405–425CrossRefGoogle Scholar
  53. Idleman BD, Dewey JF, Mange MA, Anonymous (2004) Single-crystal 40 Ar/ 39 Ar geochronology of detrital muscovite from the south Mayo Trough, western Ireland. Abstr Programs – Geol Soc Am 36(5):504Google Scholar
  54. Kay SM, Godoy E, Kurtz A (2005) Episodic arc migration, crustal thickening, subduction erosion, and magmatism in the south-central Andes. Geol Soc Am Bull 117(1–2):67–88CrossRefGoogle Scholar
  55. Klemperer SL, Ryan PD, Snyder DB (1991) A deep seismic reflection transect across the Irish Caledonides. J Geol Soc 148(1):149–164CrossRefGoogle Scholar
  56. Leake BE (1986) The geology of SW Connemara, Ireland: a fold and thrust Dalradian and metagabbroic-gneiss complex. J Geol Soc 143(2):221–236CrossRefGoogle Scholar
  57. Leake BE (1989) The metagabbros, orthogneisses and paragneisses of the Connemara complex, western Ireland. J Geol Soc 146(4):575–596CrossRefGoogle Scholar
  58. Leake BE, Tanner PWG, Singh D, Halliday AN (1983) Major southward thrusting of the Dalradian rocks of Connemara, western Ireland. Nature (Lond) 305(5931):210–213CrossRefGoogle Scholar
  59. Lee T, You C, Liu T (1993) Model-dependent 10Be sedimentation rates for the Taiwan Strait and their tectonic significance. Geology 21(5):423–426CrossRefGoogle Scholar
  60. Liu Z, Shouting T, Colin C, Liu JT, Huang C, Selvaraj K, Chen CA, Yulong Z, Siringan FP, Boulay S, Zhong C (2008) Detrital fine-grained sediment contribution from Taiwan to the northern South China Sea and its relation to regional ocean circulation. Mar Geol 255(3–4):149–155CrossRefGoogle Scholar
  61. Lowe C, Jacob AWB (1989) A north-south seismic profile across the Caledonian suture zone in Ireland. Tectonophysics 168(4):297–318CrossRefGoogle Scholar
  62. Mac Niocaill C, Smethurst MA, Ryan PD (1998) Oroclinal bending in the Caledonides of western Ireland: a mid-Palaeozoic feature controlled by a pre-existing structural grain. In: Morris A, Anderson MW (eds) Tectonophysics 299(1–3): 31–47Google Scholar
  63. Max MD, Riddihough RP (1975) Continuation of the Highland Boundary fault in Ireland. Geology 3(4):206–210CrossRefGoogle Scholar
  64. Max MD, Ryan PD, Inamdar DD (1983) A magnetic deep structural geology interpretation of Ireland. Tectonics 2(5):431–451CrossRefGoogle Scholar
  65. McConnell B, Riggs N, Crowley QG (2009) Detrital zircon provenance and Ordovician terrane amalgamation, western Ireland. J Geol Soc 166(3):473–484CrossRefGoogle Scholar
  66. McDonough WF, Sun S-S (1995) The composition of the earth. Chem Geol 120:223–253CrossRefGoogle Scholar
  67. McManus J (1972) The stratigraphy and structure of the lower Palaeozoic rocks of eastern Murrisk, County Mayo. Proc R Ir Acad B 72:307–333Google Scholar
  68. Menuge JF, Williams DM, O’Connor PD (1995) Silurian turbidites used to reconstruct a volcanic terrain and its Mesoproterozoic basement in the Irish Caledonides. J Geol Soc 152(2):269–278CrossRefGoogle Scholar
  69. Mitchell A, McKerrow WS (1975) Analogous evolution of the Burma Orogen and the Scottish Caledonides. Geol Soc Am Bull 86(3):305–315CrossRefGoogle Scholar
  70. Mullen ED (1983) MnO/TiO2/P2O5: a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis. Earth Planet Sci Lett 62:53–62CrossRefGoogle Scholar
  71. Murphy FC, Anderson TB, Daly JS, Gallagher V, Graham JR, Harper DAT, Johnston JD, Kennan PS, Kennedy MJ, Long CB, Morris JH, O’Keeffe WG, Parkes M, Ryan PD, Sloan RJ (1991) An appraisal of Caledonian suspect terranes in Ireland. Ir J Earth Sci 11:11–41Google Scholar
  72. Parnell J, Earls G, Wilkinson JJ, Hutton DHW, Boyce AJ, Fallick AE, Ellam RM, Gleeson SA, Moles NR, Carey PF, Legg I, Carey PF (2000) Regional fluid flow and gold mineralization in the Dalradian of the Sperrin Mountains, northern Ireland. Econ Geol 95(7):1389–1416Google Scholar
  73. Paskevicius J (2007) Correlation of the Ordovician regional stages of the Baltic palaeobasin with new global stages. Geologija – Vilniaus Universitetas 57:30–36Google Scholar
  74. Pearce JA, Harris NBW, Tindle AG (1984) Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J Petrol 25(4):956–983CrossRefGoogle Scholar
  75. Power SE, Ryan PD, Feely M (2001) Fluid inclusion studies on the late structural history of the Connemara Dalradian, western Ireland. Abstr Programs Geol Soc Am 33(6):448Google Scholar
  76. Pudsey CJ (1984a) Ordovician stratigraphy and sedimentology of the South Mayo Inlier. J Earth Sci (Dublin) 6(1):15–45Google Scholar
  77. Pudsey CJ (1984b) Fluvial to marine transition in the Ordovician of Ireland; a humid-region fan-delta? Geol J 19(2):143–172CrossRefGoogle Scholar
  78. Rice AHN, Williams DM (2010) Caledonian strike-slip terrane accretion in W. Ireland: insights from very low-grade metamorphism (illite-chlorite crystallinity and b0 parameter). Geol Mag 147(2):281–298CrossRefGoogle Scholar
  79. Roser BP, Korsch RJ (1988) Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of major-element data. Chem Geol 67:119–139CrossRefGoogle Scholar
  80. Ross PS, Bedard JH (2009) Magmatic affinity of modern and ancient subalkaline volcanic rocks determined from trace-element discriminant diagrams. Can J Earth Sci 46:823–839CrossRefGoogle Scholar
  81. Ryan PD (2001) The role of deep basement during continent-continent collision; a review. In: Miller JA, Holdsworth RE, Buick IS, Hand M (eds) vol 184. Geological Society Special Publications, pp 39–55Google Scholar
  82. Ryan KM, Williams DM (2007) Testing the reliability of discrimination diagrams for determining the tectonic depositional environment of ancient sedimentary basins. Chem Geol 242(1–2):103–125CrossRefGoogle Scholar
  83. Ryan PD (2008) Preservation of fore-arc basins during island arc-continent collision; some insights from the Ordovician of western Ireland. In: Draut AE, Clift PD, Scholl DW (eds) vol 36. Geological Society of America Special Paper, pp 1–9Google Scholar
  84. Ryan PD, Archer JB (1978) The Lough Nafooey fault: a Taconic structure in western Ireland. Geol Surv Ireland Bull 2:255–264Google Scholar
  85. Ryan PD, Dewey JF (1991) A geological and tectonic cross-section of the Caledonides of western Ireland. J Geol Soc 148(1):173–180CrossRefGoogle Scholar
  86. Ryan PD, Dewey JF (2004) The South Connemara Group reinterpreted; a subduction-accretion complex in the Caledonides of Galway Bay, western Ireland. J Geodyn 37(3–5):513–529CrossRefGoogle Scholar
  87. Ryan PD, Floyd PA, Archer JB (1980) The stratigraphy and petrochemistry of the Lough Nafooey Group (Tremadocian), western Ireland. J Geol Soc 137(4):443–458CrossRefGoogle Scholar
  88. Ryan PD, Max MD, Kelly T (1983a) The petrochemistry of the basic volcanic rocks of the South Connemara Group (Ordovician), western Ireland. Geol Mag 120(2):141–152CrossRefGoogle Scholar
  89. Ryan PD, Sawal VK, Rowlands AS (1983b) Ophiolitic melange separates ortho- and para-tectonic Caledonides in western Ireland. Nature (Lond) 302(5903):50–52CrossRefGoogle Scholar
  90. Ryan PD, Stillman CJ, Allen M, Pow S (1995) Terrane geochemistry contrasts across the Iapetus Suture in Ireland. Geol Mag 132(5):581–597CrossRefGoogle Scholar
  91. Sadler PM, Cooper RA, Melchin M (2009) High-resolution, early Paleozoic (Ordovician-Silurian) time scales. Geol Soc Am Bull 121(5–6):887–906CrossRefGoogle Scholar
  92. Skevington D, Archer JB (1971) A review of the Ordovician graptolite faunas of the west of Ireland. Ir Nat J 17(3):70–78Google Scholar
  93. Soper NJ, Ryan PD, Dewey JF (1999) Age of the Grampian orogeny in Scotland and Ireland. J Geol Soc 156(6):1231–1236CrossRefGoogle Scholar
  94. Stanton WI (1960) The lower Palaeozoic rocks of south-west Murrisk, Ireland. Q J Geol Soc Lond 116:269–296CrossRefGoogle Scholar
  95. Strachan RA, Holdsworth RE (2000) Late Neoproterozoic (<750 Ma) to Early Ordovician passive margin sedimentation along the Laurentian margin of Iapetus. In: Woodcock NH, Strachan RA (eds) Geological history of Britain and Ireland. Blackwell, London, pp 73–87Google Scholar
  96. Thorpe RS (ed) (1982) Andesites; orogenic andesites and related rocks. Wiley, Chichester, UK, p 724Google Scholar
  97. van Staal CR, Dewey JF, Mac Niocaill C, McKerrow WS (1998) The Cambrian-Silurian tectonic evolution of the Northern Appalachians and British Caledonides; history of a complex, west and southwest Pacific-type segment of Iapetus. In: Blundell DJ, Scott AC (eds) vol 199. Geological Society Special Publications, pp 199–242Google Scholar
  98. Verma SP, Torres-Alvarado IS, Sotelo-Rodriguez ZT (2002) SINCLAS; standard igneous norm and volcanic rock classification system. Comput Geosci 28:711–715CrossRefGoogle Scholar
  99. Viete DR, Richards SW, Lister GS, Anonymous (2006) Time-scales and heat sources for Barrovian regional metamorphism. Geochim Cosmochim Acta 70(185): A672Google Scholar
  100. Waltham D, Hall R, Smyth HR, Ebinger CJ (2008) Basin formation by volcanic arc loading. In: Draut AE, Clift PD, Scholl DW (eds) vol 436. Geological Society of America Special Paper, pp 11–26Google Scholar
  101. Williams DM, Harper DAT (1991) End-Silurian modifications of Ordovician terranes in western Ireland. J Geol Soc 148(1):165–171CrossRefGoogle Scholar
  102. Williams SH, Harper D (1994) Late Tremadoc Graptolites from the Lough Nafooey Group, South Mayo, Western Ireland. Ir J Earth Sci 13:107–111Google Scholar
  103. Williams DM, O’Connor PJ, Menuge JF (1992) Silurian turbidite provenance and the closure of Iapetus. J Geol Soc 149(Part 3):349–357CrossRefGoogle Scholar
  104. Williams DM, Harkin J, Higgs AK (1996) Implications of new microfloral evidence from the Clew Bay Complex for Silurian relationships in the western Irish Caledonides. J Geol Soc 153(5):771–777CrossRefGoogle Scholar
  105. Wrafter JP, Graham JR (1989) Short Paper: Ophiolitic detritus in the Ordovician sediments of South Mayo, Ireland. J Geol Soc 146(2):213–215CrossRefGoogle Scholar
  106. Wyatt AR (1995) Late Ordovician extinctions and sea-level change. J Geol Soc 152(6):899–902CrossRefGoogle Scholar
  107. Yardley BWD (1976) Deformation and metamorphism of Dalradian rocks and the evolution of the Connemara Cordillera. J Geol Soc 132(5):521–542CrossRefGoogle Scholar
  108. Yardley BWD, Barber JP, Gray JR (1987) The metamorphism of the Dalradian rocks of western Ireland and its relation to tectonic setting. In: Oxburgh ER, Yardley BWD, England PC (eds) Philosophical Transactions of the Royal Society of London, Series A: Mathematical and Physical Sciences 321(1557): 243–270Google Scholar
  109. Yen JY, Lundberg N (2006) Sediment compositions in offshore southern Taiwan and their relations to the source rocks in modern arc-continent collision zone. Mar Geol 225(1–4):247–263CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Earth and Ocean SciencesNational University of Ireland GalwayGalwayIreland
  2. 2.Department of GeologyUC DavisDavisUSA

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