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The Ordovician Fore-Arc and Arc Complex

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A Field Guide to the Geology of Western Ireland

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Abstract

This chapter first examines the lithologies of the ophiolitic mélange of the Deer Park Complex and the sheared metasediments of the Clew Bay Complex which, together, are interpreted as a Cambrian to mid-Ordovician subduction accretion complex. Two traverses are then made through the Ordovician sediments of the South Mayo Trough, which lie to the south. These are folded into a major syncline, the Mweelrea-Partry Syncline. The first traverse is through the early to late Ordovician sediments of the north limb, which exceed 9 km in thickness. Turbidites at lower stratigraphic levels show derivation from continental and ophiolitic sources. At higher levels, fluviatile sediments contain silicic volcanics and both first cycle metamorphic and silicic igneous detritus. The second traverse is through the volcanic complexes and the overlying, more proximal, mid to upper Ordovician sediments of the south limb. The arc rocks show an evolution from intra-oceanic composition to one influenced by melting of continental material. The sediments record the unroofing of a middle crustal Barrovian metamorphic complex and a continental arc. The Ordovician of South Mayo is interpreted as originating in a fore-arc basin in an oceanic setting that remained below sea-level during the mid-Ordovician arc-continent collision that caused the Grampian Orogeny and consequently recorded the unroofing of this orogen and the subsequent subduction flip.

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References

  • Allen R, Carter A, Najman Y, Bandopadhyay PC, Chapman HJ, Bickle MJ, Garzanti E, Vezzoli G, Andò S, Foster GL, Gerring C (2008) New constraints on the sedimentation and uplift history of the Andaman-Nicobar accretionary prism, South Andaman Island. Spec Pap Geol Soc Am 436:223–256

    Google Scholar 

  • Archer J (1977) Llanvirn stratigraphy of the Galway-Mayo border area, western Ireland. Geol J 12:77–98

    Article  Google Scholar 

  • Archer JB (1984) Clastic intrusions in deep-sea fan deposits of the Rosroe Formation, Lower Ordovician, western Ireland. J Sediment Petrol 54:1197–1205

    Google Scholar 

  • Ballantyne CK, Stone JO, McCarroll D (2008) Dimensions and chronology of the last ice sheet in Western Ireland. Q Sci Rev 27:185–200

    Article  Google Scholar 

  • Batt GE, Brandon MT, Farley KA, Roden-Tice M (2001) Tectonic synthesis of the Olympic Mountains segment of the Cascadia wedge, using two-dimensional thermal and kinematic modeling of thermochronological ages. J Geophys Res-Sol Ea 106:26731–26746

    Article  Google Scholar 

  • Bergstroem SM, Chen X, Gutiérrez-Marco JC, Dronov A (2009) The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ13C chemostratigraphy. Lethaia 42:97–107

    Article  Google Scholar 

  • Bonatti E (1976) Serpentinite protrusions in the oceanic crust. Earth Planet Sc Lett 32:107–113

    Article  Google Scholar 

  • Breeding CM, Ague JJ (2002) Slab-derived fluids and quartz-vein formation in an accretionary prism, Otago Schist, New Zealand. Geology 30:499–502

    Article  Google Scholar 

  • Burrett C (1985) Problematic, phosphatic microspheres (mazuelloids) from the Ordovician of Tasmania, Australia. Alcheringa 9:158–158

    Article  Google Scholar 

  • Chew D (2003) Structural and stratigraphic relationships across the continuation of the Highland Boundary Fault in western Ireland. Geol Mag 140:73–85

    Article  Google Scholar 

  • Chew DM, Daly JS, Magna T, Page LM, Kirkland CL, Whitehouse MJ, Lam R (2010) Timing of ophiolite obduction in the Grampian orogen. Geol Soc Am Bull 122:1787–1799

    Article  Google Scholar 

  • Chew DM, Daly JS, Page L, Kennedy M (2003) Grampian orogenesis and the development of blueschist-facies metamorphism in western Ireland. J Geol Soc Lond 160:911–924

    Article  Google Scholar 

  • 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 Lond 164:747–750

    Article  Google Scholar 

  • Clift PD, Carter A, Draut AE, Van Long H, Chew DM, Schouten HA (2009) Detrital U-Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides. Tectonophysics 479:165–174

    Article  Google Scholar 

  • Clift PD, Luther AL, Avery ME, O’Sullivan PB (2021) U–Pb detrital zircon constraints on active margin magmatism and sedimentation after the Grampian Orogeny in western Ireland. J Geol Soc Lond 178, jgs2020-093. https://doi.org/10.1144/jgs2020-093

  • Clift PD, Ryan PD (1994) Geochemical evolution of an Ordovician island arc, South Mayo, Ireland. J Geol Soc Lond 151:329–342

    Article  Google Scholar 

  • Cohen KM, Finney SC, Gibbard PL, Fan J-X (2013) The ICS international chronostratigraphic chart (2013: updated v2018/08). Episodes 36:199–204

    Article  Google Scholar 

  • Dalziel IW, Dewey JF (2018) The classic Wilson cycle revisited. Geol Soc Lond Spec Pub 470, SP470-1

    Google Scholar 

  • Dewey JF (1963) The stratigraphy of the Lower Palaeozoic rocks of central Murrisk, Co., Mayo, Eire, and the evolution of the South Mayo Trough. J Geol Soc Lond 119:313–344

    Article  Google Scholar 

  • Dewey JF (1967) The structural and metamorphic history of the Lower Palaeozoic rocks of central Murrisk, County Mayo, Eire. Q J Geol Soc Lond 123:125–155

    Article  Google Scholar 

  • Dewey JF (2000) Cenozoic tectonics of western Ireland. P Geologist Assoc 111:291–306. https://doi.org/10.1016/S0016-7878(00)80086-3

    Article  Google Scholar 

  • Dewey JF (2005) Orogeny can be very short. P Natl Acad Sci USA 102:15286–15293

    Article  Google Scholar 

  • Dewey JF, Casey J (2011) The origin of obducted large-slab ophiolite complexes. In: Arc-continent collision. Springer, pp 431–444

    Google Scholar 

  • Dewey JF, 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. Geol Soc Lond Spec Pub 164:55–107

    Article  Google Scholar 

  • Dewey JF, McKerrow W (1963) An outline of the geomorphology of Murrisk and north-west Galway. Geol Mag 100:260–275

    Article  Google Scholar 

  • Dewey JF, McKerrow W, Moorbath S (1970) The relationship between isotopic ages, uplift and sedimentation during Ordovician times in western Ireland. Scot J Geol 6:133–145

    Article  Google Scholar 

  • Dewey JF, McManus J (1964) Superposed folding in the Silurian rocks of Co., Mayo, Eire. Geol J 4:61–76

    Article  Google Scholar 

  • Dewey JF, Ryan PD (2016) Connemara: its position and role in the Grampian Orogeny. Can J Earth Sci 53:1246–1257

    Article  Google Scholar 

  • Dewey JF, Ryan PD (1990) The Ordovician evolution of the South Mayo Trough, western Ireland. Tectonics 9:887–901

    Article  Google Scholar 

  • Dewey JF, Shackleton RM (1984) A model for the evolution of the Grampian tract in the early Caledonides and Appalachians. Nature 312:115–121

    Article  Google Scholar 

  • Dewey JF, Strachan R (2003) Changing Silurian-Devonian relative plate motion in the Caledonides: sinistral transpression to sinistral transtension. J Geol Soc Lond 160:219–229

    Article  Google Scholar 

  • Doglioni C, Harabaglia P, Martinelli G, Mongelli F, Zito G (1996) A geodynamic model of the Southern Apennines accretionary prism. Terra Nova 8:540–547

    Article  Google Scholar 

  • Donovan S (1986) Pentameric pelmatozoan columns from the Arenig Tourmakeady Limestone, county Mayo. Irish J Earth Sci 7:93–97

    Google Scholar 

  • Draut AE, Clift PD (2001) Geochemical evolution of arc magmatism during arc-continent collision, South Mayo, Ireland. Geology 29:543–546

    Article  Google Scholar 

  • 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 141:195–207

    Article  Google Scholar 

  • Evans BW, Hattori K, Baronnet A (2013) Serpentinite: what, why, where? Elements 9:99–106

    Article  Google Scholar 

  • Fisher D, Byrne T (1987) Structural evolution of underthrusted sediments, Kodiak Islands, Alaska. Tectonics 6:775–793

    Article  Google Scholar 

  • Forster M, Lister G (2003) Cretaceous metamorphic core complexes in the Otago Schist, New Zealand. Aust J Earth Sci 50:181–198

    Article  Google Scholar 

  • Fujioka K et al (1989) Arc volcanism and rifting. Nature 342:18–20

    Article  Google Scholar 

  • Gibson P, Lyle P, George D (1996) Ground-based magnetic patterns across selected Irish rocks and structures. Irish J Earth Sci 15:129–143

    Google Scholar 

  • Graham JR (1987) The nature and field relations of the Ordovician Maumtrasna Formation, County Mayo, Ireland. Geol J 22:347–369

    Article  Google Scholar 

  • Graham JR (2001) The geology of Clare Island: perspective and problems. In: New survey of Clare Island, Vol 2: Geology, Royal Irish Academy, pp 1–17

    Google Scholar 

  • Graham JR (2009) Ordovician of the North. In: Holland C, Saunders A (eds) The geology of Ireland. Dunedin Academic Press Edinburgh, pp 43–67

    Google Scholar 

  • Graham JR (2019) The structure and stratigraphical relations of the Lough Nafooey Group, South Mayo. Irish J Earth Sci 37:1–18

    Article  Google Scholar 

  • Graham JR (2021) Geology of South Mayo: a field guide. Geological Survey Ireland, Dublin. 158pp

    Google Scholar 

  • Graham JR, Leake BE, Ryan PD (1989) The geology of South Mayo. Scottish Academic Press

    Google Scholar 

  • Harkin J, Williams D, Menuge J, Daly J (1996) Turbidites from the Clew Bay Complex, Ireland: provenance based on petrography, geochemistry and crustal residence values. Geol J 31:379–388

    Article  Google Scholar 

  • Harper D, Graham J, Owen A, Donovan S (1988) An Ordovician fauna from Lough Shee, Partry Mountains, Co., Mayo, Ireland. Geol J 23:293–310

    Article  Google Scholar 

  • Harper DA, Parkes MA, McConnell BJ (2010) Late Ordovician (Sandbian) brachiopods from the Mweelrea Formation, South Mayo, western Ireland: stratigraphic and tectonic implications. Geol J 45:445–450

    Google Scholar 

  • Harper DA, Williams D, Armstrong HA (1989) Stratigraphical correlations adjacent to the Highland Boundary Fault in the west of Ireland. J Geol Soc Lond 146:381–384

    Article  Google Scholar 

  • Hutton DH, Dewey JF (1986) Palaeozoic terrane accretion in the Western Irish Caledonides. Tectonics 5:1115–1124

    Article  Google Scholar 

  • Johnston JD, Phillips WE (1995) Terrane amalgamation in the Clew Bay region, west of Ireland. Geol Mag 132:485–501. https://doi.org/10.1017/S0016756800021154

    Article  Google Scholar 

  • Kennedy MJ (1980) Serpentinite-bearing melange in the Dalradian of County Mayo and its significance in the development of the Dalradian basin. J Earth Sci-Dublin 3:117–126

    Google Scholar 

  • Klemperer S, Ryan PD, Snyder DB (1991) A deep seismic reflection transect across the Irish Caledonides. J Geol Soc Lond 148:149–164

    Article  Google Scholar 

  • Lockwood J (1971) Sedimentary and gravity-slide emplacement of serpentinite. Geol Soc Am Bull 82:919–936

    Article  Google Scholar 

  • Maltman A, Labaume P, Housen BA (1997) Structural geology of the décollement at the toe of the Barbados accretionary prism. Proc ODP Sci Res 156:279–292

    Google Scholar 

  • Mange M, Idleman B, Yin Q-Z, Hidaka H, Dewey JF (2010) Detrital heavy minerals, white mica and zircon geochronology in the Ordovician South Mayo Trough, western Ireland: signatures of the Laurentian basement and the Grampian orogeny. J Geol Soc Lond 167:1147–1160

    Article  Google Scholar 

  • Max MD (1989) The Clew Bay Group: a displaced terrane of Highland Border Group rocks (Cambro-Ordovician) in Northwest Ireland. Geol J 24:1–17

    Article  Google Scholar 

  • Max MD, Riddihough RP (1975) The continuation of the Highland Boundary Fault in Ireland. Geology 3:206–210

    Article  Google Scholar 

  • Max MD, Ryan PD, Inamdar D (1983) A magnetic deep structural geology interpretation of Ireland. Tectonics 2:431–451

    Article  Google Scholar 

  • McCaffrey K (1997) Controls on reactivation of a major fault zone: the Fair Head–Clew Bay line in Ireland. J Geol Soc Lond 154:129–133

    Article  Google Scholar 

  • McConnell B, Riggs N, Crowley QG (2009) Detrital zircon provenance and Ordovician terrane amalgamation, western Ireland. J Geol Soc Lond 166:473–484

    Article  Google Scholar 

  • McManus J (1972) The stratigraphy and structure of the Lower Palaeozoic rocks of eastern Murrisk, Co. Mayo. P Roy Irish Acad B 72:307–333

    Google Scholar 

  • Mohr P, Mussett AE, Kennan PS (1984) The Droimchogaidh Sill, Connacht, Ireland. Geol J 19:1–21

    Article  Google Scholar 

  • Mortimer N (2000) Metamorphic discontinuities in orogenic belts: example of the garnet–biotite–albite zone in the Otago Schist, New Zealand. Int J Earth Sci 89:295–306

    Article  Google Scholar 

  • O’Sullivan GJ, Chew DM (2020) The clastic record of a Wilson Cycle: evidence from detrital apatite petrochronology of the Grampian-Taconic fore-arc. Earth Planet Sc Lett 552:116588. https://doi.org/10.1016/j.epsl.2020.116588

    Article  Google Scholar 

  • Pearce JA, Reagan MK (2019) Identification, classification, and interpretation of boninites from Anthropocene to Eoarchean using Si-Mg-Ti systematics. Geosphere 15:1008–1037

    Article  Google Scholar 

  • Phillips WE (1973) The pre-Silurian rocks of Clare Island, Co., Mayo, Ireland, and the age of metamorphism of the Dalradian in Ireland. J Geol Soc Lond 129:585–606

    Article  Google Scholar 

  • Pudsey CJ (1984) Ordovician stratigraphy and sedimentology of the South Mayo inlier. Irish J Earth Sci 6:15–45

    Google Scholar 

  • Rubinstein CV, Vajda V (2019) Baltica cradle of early land plants? Oldest record of trilete spores and diverse cryptospore assemblages; evidence from Ordovician successions of Sweden. Geol Foren Stock for 14:181–190

    Google Scholar 

  • Rushton AW, Phillips WE (1973) A Protospongia from the Dalradian of Clare Island, Co Mayo, Ireland. Palaeontology 16:231–237

    Google Scholar 

  • Ryan PD (2008) Preservation of forearc basins during island arc-continent collision: some insights from the Ordovician of western Ireland. Spec Pap Geol Soc Am 436:1–9

    Google Scholar 

  • Ryan PD, Dewey JF (1991) A geological and tectonic cross-section of the Caledonides of western Ireland. J Geol Soc Lond 148:173–180

    Article  Google Scholar 

  • Ryan PD, Dewey JF (2011) Arc–continent collision in the Ordovician of western Ireland: stratigraphic, structural and metamorphic evolution. In: Arc-continent collision. Springer, pp 373–401

    Google Scholar 

  • Ryan PD, Floyd PA, Archer JB (1980) The stratigraphy and petrochemistry of the Lough Nafooey Group (Tremadocian), western Ireland. Q J Geol Soc Lond 137:443–458

    Article  Google Scholar 

  • Ryan PD, Sawal VK, Rolands AS (1983) Ophiolitic melange separates ortho-and para-tectonic Caledonides in western Ireland. Nature 301:50–52

    Article  Google Scholar 

  • Ryan PD, Soper NJ, Snyder DB, England RW, Hutton DH (1995) The Antrim-Galway Line; a resolution of the Highland Border Fault enigma of the Caledonides of Britain and Ireland. Geol Mag, Mag 132:171–184

    Article  Google Scholar 

  • Skevington D (1971) Palaeontological evidence bearing on the age of Dalradian deformation and metamorphism in Ireland and Scotland. Scot J Geol 7:285–288

    Article  Google Scholar 

  • Skevington D, Archer JB (1971) A review of the Ordovician graptolite faunas of the west of Ireland. Irish Nat J 17:70–78

    Google Scholar 

  • Stanton WI (1960) The lower Palaeozoic rocks of south-west Murrisk, Ireland. Q J Geol Soc Lond 116:269–290

    Article  Google Scholar 

  • Stern RJ, Reagan M, Ishizuka O, Ohara Y, Whattam S (2012) To understand subduction initiation, study forearc crust: to understand forearc crust, study ophiolites. Lithosphere 4:469–483

    Article  Google Scholar 

  • Stouge S, Harper DA, Sevastopulo GD, O’Mahony D, Murray J (2016) Lower and Middle Ordovician conodonts of Laurentian affinity from blocks of limestone in the Rosroe Formation, South Mayo Trough, western Ireland and their palaeogeographic implication. Geol J 51:584–599

    Article  Google Scholar 

  • Tanner P (2007) The role of the Highland Border ophiolite in the 470 Ma Grampian event, Scotland. Geol Mag 144:597–602

    Article  Google Scholar 

  • Taylor PD, Curry GB (1985) The earliest known fenestrate bryozoan, with a short review of Lower Ordovician Bryozoa. Palaeontology 28:147–158

    Google Scholar 

  • Topuz G, Çelık ÖF, Şengör AC, Altintaş İE, Zack T, Rolland Y, Barth M (2013) Jurassic ophiolite formation and emplacement as backstop to a subduction-accretion complex in northeast Turkey, the Refahıye ophiolite, and relation to the Balkan ophiolites. Am J Sci 313:1054–1087

    Article  Google Scholar 

  • Van Staal C, Dewey JF, Mac Niocaill C, McKerrow W (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. Geol Soc Lond Spec Pub 143:197–242

    Article  Google Scholar 

  • Williams A, Curry GB (1985) Lower Ordovician Brachiopoda from the Tourmakeady Limestone, Co., Mayo, Ireland. Bull Br Mus Nat His Geol 38:183–269

    Google Scholar 

  • Williams D (1984) The stratigraphy and sedimentology of the Ordovician Partry Group, southeastern Murrisk, Ireland. Geol J 19:173–186

    Article  Google Scholar 

  • Williams D, Harkin J, Armstrong H, Higgs K (1994) A late Caledonian melange in Ireland: implications for tectonic models. J Geol Soc Lond 151:307–314

    Article  Google Scholar 

  • Williams D, Harkin J, Rice A (1997) Umbers, ocean crust and the Irish Caledonides: terrane transpression and the morphology of the Laurentian margin. J Geol Soc Lond 154:829–838

    Article  Google Scholar 

  • Williams H, Stevens R (1974) The ancient continental margin of eastern North America. In: The geology of Continental Margins. Springer, pp 781–796

    Google Scholar 

  • Williams S, Harper D (1994) Late Tremadoc Graptolites from the Lough Nafooey Group, South Mayo, Western Ireland. Irish J Earth Sci 13:107–111

    Google Scholar 

  • Wrafter JP, Graham JR (1989) Ophiolitic detritus in the Ordovician sediments of South Mayo, Ireland. J Geol Soc Lond 146:213–215

    Article  Google Scholar 

  • Zhang X, Cawood PA, Huang C-Y, Wang Y, Yan Y, Santosh M, Chen W, Yu M (2016) From convergent plate margin to arc–continent collision: Formation of the Kenting Mélange, Southern Taiwan. Gondwana Res 38:171–182

    Article  Google Scholar 

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Authors and Affiliations

  1. School of Natural Sciences, Earth and Ocean Sciences, National University of Ireland Galway, Unversity Road, Galway, Ireland

    Paul D. Ryan

  2. John Dewey, University College, High Street, Oxford, OX1 4BH, UK

    John F. Dewey

  3. Department of Geology, John Graham, Trinity College Dublin, Museum Building, Dublin, Ireland

    John R. Graham

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  1. Paul D. Ryan
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  2. John F. Dewey
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  3. John R. Graham
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Correspondence to Paul D. Ryan .

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  1. School of Natural Sciences, Earth and Ocean Sciences, National University of Ireland, Galway, Ireland

    Paul D. Ryan

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Ryan, P.D., Dewey, J.F., Graham, J.R. (2022). The Ordovician Fore-Arc and Arc Complex. In: Ryan, P.D. (eds) A Field Guide to the Geology of Western Ireland. Springer Geology(). Springer, Cham. https://doi.org/10.1007/978-3-030-97479-4_6

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