Abstract
The Slishwood Division of northwestern Ireland is located along the southwestern margin of the Laurentian palaeocontinent. As detailed elsewhere in this guide (e.g., Chapters “The Basement and Dalradian Rocks of the North Mayo Inlier” and “The Central Ox Mountains”), the metamorphism and deformation of this region is generally attributed to the collision of outboard magmatic arcs with the Laurentian continental margin during the c. 470 Ma Grampian Orogeny. The Slishwood Division exhibits several features that are unique within the Grampian orogen. In particular, the metamorphic history of these rocks—early eclogite-facies and later high-pressure-granulite-facies—is different from that in any other region of the Grampian belt in Ireland or Britain. The Slishwood Division is plausibly explained as an exotic terrane that experienced at least part of its tectonic history in an outboard position, originating as a microcontinent rifted from Laurentia that experienced deep tectonic burial and arc magmatism before colliding with the Laurentian margin during the Grampian Orogeny. This chapter provides a series of field locations from which the evidence supporting this model was obtained, including evidence for a tectonic suture, the North Ox Mountains Slide, along which a small remnant ophiolitic fragment may be examined.
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References
Alsop GI (1991) Gravitational collapse and extension along a mid-crustal detachment: the Lough Derg Slide, northwest Ireland. Geol Mag 128:345–354
Chew DM, Flowerdew MJ, Page LM, Crowley QG, Daly JS, Cooper M, Whitehouse MJ (2008) The tectonothermal evolution and provenance of the Tyrone Central Inlier, Ireland. Grampian imbrication of an outboard Laurentian microcontinent? J Geol Soc Lond 165:675–685
Chew DM, Daly JS, Magna T, Page LM, Kirkland CL, Whitehouse MJ, Lam R (2010) Timing of ophiolite obduction in the Grampian Orogen. GSA Bull 122:1787–1799
Cooper MR, Crowley QG, Hollis SP, Noble SR, Roberts S, Chew DM, Merriman RJ, Earls G, Herrington R (2011) Age constraints and geochemistry of the Ordovician Tyrone Igneous Complex, Northern Ireland: implications for the Grampian orogeny. J Geol Soc Lond 168:837–850
Daly JS (2009) Precambrian. In: Holland CH, Sanders IS (eds) The geology of Ireland, 2nd edition. Dunedin Academic Press, Edinburgh, pp 7–42
Daly JS, Flowerdew MJ, Whitehouse MJ (2012) Grampian high-pressure-granulite-facies metamorphism of the Slishwood Division, NW Ireland and its enigmatic eclogite-facies precursor. Geophys Res Abs, 14:13462, EGU General Assembly 2012
Dalziel IWD, Soper NJ (2001) Neoproterozoic extension on the Scottish Promontory of Laurentia: paleogeographic and tectonic implications. J Geol 109:299–317
Dewey JF, Mange MA (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: Mac Niocaill C, Ryan PD (eds) Continental tectonics. Geol Soc Lond Spec Pub, 164:55–107
Flowerdew MJ (1998/9) The Giant’s Rock Tonalite and basement-cover relationships in the Northeast Ox Mountains Inlier, northwestern Ireland. Irish J Earth Sci 17:71–82
Flowerdew MJ (2000) The thermal history of Proterozoic rocks in the Caledonides of NW Ireland and the response of mineral dating systems to deformation. Unpublished Ph.D. thesis, National University of Ireland, Dublin
Flowerdew MJ, Daly JS (2005) Sm-Nd mineral ages and PT constraints on the pre-Grampian high grade metamorphism of the Slishwood division, northwest Ireland. Irish J Earth Sci 23:107–123
Flowerdew MJ, Daly JS, Guise PG, Rex DC (2000) Isotopic dating of overthrusting, collapse and related granitoid intrusion in the Grampian orogenic belt, NW Ireland. Geol Mag 137:419–435
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 162:563–575
Flowerdew MJ, Chew DM, Daly JS, Millar IL (2009) Hidden Archaean and Palaeoproterozoic crust in NW Ireland: evidence from zircon Hf isotope data from granitoid intrusions. Geol Mag 146:903–906
Harney S, Long CB, MacDermot CV (1996) Geology of Sligo-Leitrim. Sheet 7. Bedrock Geology 1:100, 000 Map Series. Geological Survey of Ireland
Hollis SP, Roberts S, Cooper MR, Earls G, Herrington R, Condon DJ, Cooper MJ, Archibald SM, Piercey SJ (2012) Episodic arc-ophiolite emplacement and the growth of continental margins: late accretion in the Northern Irish sector of the Grampian-Taconic orogeny. GSA Bull 124:1702–1723
Lemon GG (1966) Serpentinites in the North-East Ox Mountains, Eire. Geol Mag 103:124–137
Lemon GG (1971) The Pre-Cambrian rocks of the N.E. Ox Mountains, Eire. Geol Mag 108:193–200
Max MD, Long CB (1985) Pre-Caledonian basement in Ireland and its cover relationships. Geol J 20:341–366
McAteer C, Parkes M (2004) The geological heritage of Sligo. An audit of county geological sites in Sligo. Geological Survey of Ireland. Unpublished Report
Molloy MA, Sanders IS (1983) The Northeast Ox Mountains Inlier. In: Archer JB, Ryan PD (eds) A Geological guide to the Caledonides of western Ireland. Geological Survey of Ireland Guide Series 4, 52–55
Phillips WEA, Taylor WEG, Sanders IS (1975) An analysis of the geological history of the Ox Mountains inlier. Sci Proc R Dubl Soc 5B:311–329
Sanders IS (1994) The northeast Ox Mountains Inlier, Ireland. In Gibbons W, Harris AL (eds) A revised correlation of Precambrian rocks in the British Isles. Geol Soc Lond Spec Rep 22:63–64
Sanders IS (2018) Introducing metamorphism. Dunedin Academic Press, Edinburgh and London, p 148
Sanders IS, Daly JS, Davies GR (1987) Late Proterozoic high-pressure granulite facies metamorphism in the NE Ox inlier, NW Ireland. J Met Geol 5:69–85
Soper NJ (1994) Neoproterozoic sedimentation on the northeast margin of Laurentia and the opening of Iapetus. Geol Mag 131:291–299
Soper NJ, England RW (1995) Vendian and Riphean rifting in NW Scotland. J Geol Soc Lond 152:11–14
Unitt RP (1997) The structural and metamorphic evolution of the Lough Derg Complex, Counties Donegal and Fermanagh. Unpublished Ph.D. thesis, National University of Ireland, Cork
van Breemen O, Halliday AN, Johnson MRW, Bowes DR (1978) Crustal additions in late Precambrian times. In Bowes DR, Leake BE (eds) Crustal evolution in northwestern Britain and adjacent regions. Geol J Special Issue 10:81–106
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-style segment of Iapetus. In Blundell DJ, Scott AC (eds) Lyell: the past is the key to the present. Geol Soc Lond Spec Pub 143:199–242
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Daly, J.S., Flowerdew, M.J., Chew, D.M., Sanders, I.S. (2022). The Slishwood Division and Its Relationship with the Dalradian Rocks of the Ox Mountains. 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_3
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