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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Article
Current basin models for the Western Irish Namurian Basin (WINB) envisage an elongate trough along the line of the present-day Shannon Estuary that was infilled with clastic sediments derived from a hinterland that lay to the W or NW. This paper argues for an alternative basin configuration with source areas to the SW supplying sediment to a basin where deepest water conditions were in northern County Clare. Rapid subsidence along the present-day Shannon Estuary ponded sediment in this area throughout the early Namurian and, only with the rapid increase of sedimentation rates within the mid-Namurian (Kinderscoutian Stage), were substantial amounts of sediment able to prograde to the NE of the basin. This alternative model better explains the overwhelming predominance of NE-directed palaeocurrents in the Namurian infill, but requires fundamental revisions to most aspects of current depositional models.\ud \ud \ud Deep-water black shales (Clare Shale Formation) initially accumulated throughout the region and were progressively downlapped by an unconfined turbidite system (Ross Formation) prograding to the NE. This in turn was succeeded by an unstable, siltstone-dominated slope system (Gull Island Formation) characterized by large-scale soft-sediment deformation, which also prograded to the NE. In the northern-most basin outcrops, in northern County Clare, this early phase of basin infill was developed as a condensed succession of radiolarian-rich black shales, minor turbiditic sandstones and undisturbed siltstones. The new basin model envisages the northern exposures of County Clare to be a distal, basin floor succession whereas the traditional model considers it a relatively shallow, winnowed, basin margin succession. Later stages of basin infill consist of a series of deltaic cycles that culminate in major, erosive-based sandstone bodies (e.g. Tullig Sandstone) interpreted either as axial, deltaic feeder channels or incised valley fills genetically unrelated to the underlying deltaic facies. Within the context of the new basin model the former alternative is most likely and estimated channel depths within the Tullig Sandstone indicate that the basal erosive surface could have been generated by intrinsic fluvial scour without recourse to base-level fall. The northerly flowing Tullig channels pass down-dip into isolated channel sandbodies interbedded with wave-dominated strata that suggest the deltas of the WINB were considerably more wave-influenced than hitherto proposed. The retreat of the Tullig delta during sea-level rise saw the rapid southerly retrogradation of parasequences, as may be expected if the basin margin lay to the SW of the present-day outcrops.\ud
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    • BENNETT, S.J. & BEST, J.L. (1996) Mean ¯ow and turbulence structure over ®xed ripples and the ripple-dune transition. In: Coherent Flow Structures in Open Channels (Ed. by P.J. Ashworth, S.J. Bennett, J.L. Best & S.J. Mclelland), pp. 281±304. Wiley and Sons, Chichester.
    • BEST, J.L. & ASHWORTH, P.J. (1997) Scour in large braided rivers and the recognition of sequence stratigraphic boundaries. Nature, 387, 275±277.
    • BRAITHWAITE, K. (1993) The stratigraphy of a section spanning the mid-Carboniferous at Inishcorker, County Clare, Ireland. Ann. Soc. Geol. Belg., 116, 209±221.
    • BRAITHWAITE, K. (1995) Stratigraphy of the mid±Carboniferous boundary. Unpubl. PhD Thesis, University of Leeds, Leeds, UK.
    • CALDER, J.H. (1998) The Carboniferous evolution of Nova Scotia. In: Lyell: the Past Is the Key to the Present (Ed. by D.J. Blundell & A.C. Scott), Spec. Publ. Geol. Soc. Lond., 143, 261±302.
    • CHAPIN, M., DAVIES, P., GIBSON, J.L. & PETTINGILL, H.S. (1994) Reservoir architecture of turbidite sheet sandstones in laterally extensive outcrops, Ross Formation, western Ireland. In: Submarine Fans and Turbidite Systems, pp. 53±68. GCSSEPM Foundation 15th Ann. Res. Conference.
    • COLLINSON, J.D., MARTINSEN, O., BAKKEN, B. & KLOSTER, A. (1991) Early ®ll of the Western Irish Namurian Basin: a complex relationship between turbidites and deltas. Basin Res., 3, 223±242.
    • CROKER, P.F. (1995) The Clare Basin: a geological and geophysical outline. In: The Petroleum Geology of Ireland's Offshore Basins (Ed. by P.F. Croker, & P.M. Shannon), Spec. Publ. Geol. Soc. Lond., 93, 327±339.
    • DAVIES, S.J. & ELLIOTT, T. (1996) Spectral gamma ray characterisation of high resolution sequence stratigraphy: examples from Upper Carboniferous ¯uvio-deltaic systems, County Clare, Ireland. In: High Resolution Sequence Stratigraphy: Innovations and Applications (Ed. by J.A. Howell & J.F. Aitken), Spec. Publ. Geol. Soc. Lond., 104, 25±35.
    • ELLIOTT, T. (2000) Mega¯ute erosion surfaces and the initiation of turbidite channels. Geology, 28, 119±122.
    • FRASER, A.J. & GAWTHORPE, R.L. (1990) Tectono-stratigraphic development and hydrocarbon habitat of the Carboniferous of northern England. In: Tectonic Events Responsible for Britain's Oil and Gas Reserves (Ed. by R. F. P. Hardman & J. Brooks), Spec. Publ. Geol. Soc. Lond., 55, 49±86.
    • GALLAGHER, S.J. (1996). The stratigraphy and cyclicity of the late Dinantian platform carbonates in parts of southern and western Ireland. In: Recent Advances in Lower Carboniferous Geology (Ed. by P. Strogen, I. D. Somerville & G. Ll. Jones), Spec. Publ. Geol. Soc. Lond., 107, 239±251.
    • GAWTHORPE, R.L. (1987) Tectono-sedimentary evolution of the Bowland Basin, N. England, during the Dinantian. J. Geol. Soc. Lond., 144, 59±71.
    • GAWTHORPE, R.L., GUTTERIDGE, P. & LEEDER, M.R. (1989) Devonian and Dinantian basin evolution in northern England and North Wales. In: The Role of Tectonics in Devonian and Carboniferous Sedimentation in the British Isles (Ed. by R. S. Arthurton & S. C. Nolan), Yorkshire Geol. Soc. Occ. Publ., 6, 1±23.
    • GILL, W.D. (1979) Syndepositional sliding and slumping in the West Clare Namurian Basin, Ireland. Spec. Pap. Geol. Surv. Ireland, 4.
    • GLOVER, B.W., LENG, M.J. & CHISHOLM, J.I. (1996) A second major ¯uvial sourceland for the Silesian Pennine Basin of northern England. J. Geol. Soc. Lond., 153, 901±906.
    • GOODHUE, R. & CLAYTON, G. (1999) Organic maturation levels, thermal history and hydrocarbon source rock potential of the Namurian rocks of the Clare Basin, Ireland. Mar. Petrol. Geol., 16, 667±675.
    • HAMPSON, G.J., ELLIOTT, T. & DAVIES, S.J. (1997) The application of sequence stratigraphy to Upper Carboniferous ¯uvio-deltaic strata of the onshore UK and Ireland: implications for the southern North Sea. J. Geol. Soc. Lond., 154, 719±733.
    • HASZELDINE, R.S. (1988) Crustal lineaments in the British Isles: their relationship to Carboniferous Basins. In: Sedimentation in a Synorogenic Basin Complex. The Upper Carboniferous of Northwest Europe (Ed. by B.M. BESLY & G. KELLING), 53±68. Blackie, Glasgow.
    • HODSON, F. (1954a) The beds above the Carboniferous Limestone in northwest County Clare, Eire. Q. J. Geol. Soc. Lond., 109, 259±283.
    • HODSON, F. (1954b) The Carboniferous rocks of Foynes Island, County Limerick. Geol. Mag., 91, 153±160.
    • HODSON, F. (1978) Namurian of Ireland. In: A Correlation of Silesian Rocks in the British Isles (Ed. by W. H. C. Ramsbottom, et al.), Spec. Report Geol. Soc. Lond., 10, 35±43.
    • HODSON, F. & LEWARNE, G.C. (1961) A mid-Carboniferous (Namurian) basin in parts of the counties of Limerick and Clare, Ireland. Q. J. Geol. Soc. Lond., 117, 307±333.
    • HOLDSWORTH, B.K. (1966) A preliminary study of the palaeontology and palaeoenvironment of some Namurian Limestone `bullions'. Mercian Geologist, 1, 315±337.
    • JACKSON, R.G. (1976) Sedimentological and ¯uid-dynamic implications of the turbulence bursting phenomenon in geophysical ¯ows. J. Fluid Mech., 77, 531±560.
    • LECLAIR, S.F., BRIDGE, J.S. & WANG, F. (1997) Preservation of cross-sets due to migration of subaqueous dunes over aggrading and non-aggrading beds; comparison of experimental data with theory. Geoscience Can., 24, 55±66.
    • LEEDER, M.R. & HARDMAN, M. (1990) Carboniferous geology of the Southern North Sea Basin and controls on hydrocarbon prospectivity. In: Tectonic Events Responsible for Britain's Oil and Gas Reserves (Ed. by R. F. P. Hardman & J. Brooks), Spec. Publ. Geol. Soc. Lond., 55, 87±105.
    • LEEDER, M.R. & MCMAHON, A.H. (1988) Upper Carboniferous (Silesian) basin subsidence in northern Britain. In: Sedimentation in a Synorogenic Basin Complex. The Upper Carboniferous of Northwest Europe (Ed. by B. M. BESLY & G. KELLING), 43±52. Blackie, Glasgow.
    • MARTINSEN, O.J. (1989) Styles of syndepositional deformation on a Namurian (Carboniferous) delta slope, Western Irish Namurian Basin, Ireland. In: Deltas ± Sites and Traps of Fossil Fuels (Ed. by M. H. Whateley & K. T. Pickering), Spec. Publ. Geol. Soc. Lond., 41, 167±177.
    • MARTINSEN, O.J. & BAKKEN, B. (1990) Extensional and compressional zones in slumps and slides ± examples from the Namurian of County Clare, Ireland. J. Geol. Soc. Lond., 147, 153±164.
    • MAYNARD, J.R., HOFMAN, W., DUNAY, R.E., BENTHAM, P.N., DEAN, K.P. & WATSON, I. (1997) The Carboniferous of western Europe: the development of a petroleum system. Petrol. Geosci., 3, 97±115.
    • MORRIS, P. & MAX, M.D. (1995) Magnetic crustal character in Central Ireland. Geol. J., 30, 49±67.
    • O'BRIEN, M.V. (1953) Phosphatic horizons in the Upper Carboniferous of Ireland. In: Compte Rendu 19th Int. Geol. Congr., pp. 135±143. Algeria.
    • PULHAM, A.J. (1989) Controls on internal structure and architecture of sandstone bodies within Upper Carboniferous ¯uvially-dominated deltas, County Clare, western Ireland. In: Deltas ± Sites and Traps of Fossil Fuels (Ed. by M. H. Whateley & K. T. Pickering), Spec. Publ. Geol. Soc. Lond., 41, 179±203.
    • RIDER, M.H. (1969) Sedimentological studies in the West Clare Namurian, Ireland and the Mississippi River delta. Unpubl. PhD Thesis, Imperial College, London.
    • RIDER, M.H. (1974) The Namurian of West County Clare. Proc. R. Irish Acad., 74B, 125±142.
    • RIDER, M.H. (1978) Growth faults in the Carboniferous of Western Ireland. Bull. Am. Ass. Petrol. Geol., 62, 2191±2213.
    • RIPPON, J.H. (1996) Sand body orientation, palaeoslope analysis and basin-®ll implications in the Westphalian A-C of Great Britain. J. Geol. Soc. Lond., 153, 881±900.
    • SEVASTOPULO, G.D. (1981a) Lower Carboniferous. In: A Geology of Ireland (Ed. by C.H. HOLLAND), pp. 147±172. Scottish Academic Press, Edinburgh.
    • SEVASTOPULO, G.D. (1981b) Upper Carboniferous. In: A Geology of Ireland (Ed. by C.H. HOLLAND), pp. 173±188. Scottish Academic Press, Edinburgh.
    • SIMS, A.P. (1989) Bed and sand-body architectures in the Pendle Formation of north-west England. Brit. Sed. Res. Group Field Guide, University of Leeds, pp. 9-1±9-26.
    • STROGEN, P. (1988) The Carboniferous lithostratigraphy of southeast County Limerick, Ireland, and the origin of the Shannon Trough. Geol. J., 23, 121±137.
    • STROGEN, P., SOMERVILLE, I.D., PICKARD, N.A.H., JONES, G.Ll. & FLEMING, M. (1996) Controls on ramp, platform and basinal sedimentation in the Dinantian of the Dublin Basin and Shannon Trough, Ireland. In: Recent Advances in Lower Carboniferous Geology (Ed. by P. Strogen, I. D. Somerville & G. Ll. Jones), Spec. Publ. Geol. Soc. Lond., 107, 263±279.
    • WILLIAMS, H. & SOEK, H.F. (1993) Predicting reservoir sandbody orientation from dipmeter data: the use of sedimentary dip pro®les from outcrop studies. In: The Geological Modelling of Hydrocarbon Reservoirs and Outcrop Analogues (Ed. by S. D. Flint & I. D. Bryant), Spec. Publ. Int. Ass. Sedimentol., 15, 143±156.
    • Received 20 August 1999; accepted 16 February 2000
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