A Field Guide to the Carboniferous Sediments of the Shannon by James L. Best, Paul B. Wignall

By James L. Best, Paul B. Wignall

The Carboniferous Shannon Basin of Western eire has turn into the most visited box parts on the planet. It presents an incredible chance for studying a variety of old sedimentary environments, together with carbonate shelf, reefs and dust mounds, black shales and phosphates, and a spectrum of deep sea, shallow marine, fluvio-deltaic and alluvial siliciclastic sediments. the world boasts large outcrops and a few of the main well known sections via turbidites, large-scale tender sediment deformation positive aspects and sediments that demonstrate a reaction to tectonic and sea-level controls.

This box consultant presents the 1st synthesis of the central localities during this region of Western eire, and provides an simply obtainable instruction manual that may advisor the reader to, and inside of, quite a lot of sedimentary facies, permitting an knowing of the evolving nature of the fill of this Carboniferous basin and the context of its sedimentary and tectonic evolution. The advisor summarizes fresh and new paintings within the region by way of quite a number authors and descriptions problems with present debate in regards to the Shannon Basin and its palaeoenvironmental interpretation. the sphere advisor will locate broad use in educating and learn by way of educational researchers, expert and beginner geologists, in addition to through utilized geologists, geophysicists and reservoir engineers who use those outcrops as analogues for subsurface reservoirs in lots of parts of the world.

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Extra info for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland

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However, the sudden but short‐lived accelerated pulse of subsidence in the late Tournaisian and the development of volcanoes on the eastern margin of the Shannon Basin are both features atypical of extensional basins. Volcanism produced by extension and decompression 38 Chapter 3 melting should see eruptions occurring in the centre of a basin. Instead, these observations better fit a transtensional origin for the Shannon Basin (Haszeldine, 1984; Strogen, 1988; Warr, 2012). , 2011). In this scenario, the South Munster Basin to the south of the Shannon Estuary became an under‐ filled foreland basin in the Dinantian, whilst the Shannon Basin was the product of block faulting in the fore‐bulge region (Higgs, 2004).

Combination of faunal data with structural data suggests that in eastern Ireland the Tinure Fault represents the surface trace of the Iapetus Suture 18 Chapter 2 Zone (Chew & Stillman, 2009; Vaughan & Johnston, 1992), although these data do not define its position at depth. Using similar faunal and structural data, the Iapetus Suture Zone can be projected westwards but the greater degree of Upper Palaeozoic cover makes this projection less well‐­ constrained. However, most workers draw the surface trace of the Iapetus Suture through the Shannon Estuary (Fig.

The numerical ages were based on correlation of the goniatite biostratigraphy with the radiometric time scale of Menning et al. (2000). 5%, as this included more strongly‐deformed areas further south, but it is less than the 15% estimated by Le Gall (1991) for the Shannon Basin. 8% was due to thrusts. A general lateral change from kink geometries in the south to concentric geometries in the north was interpreted as due largely to lithological control. Cleavage is present throughout much of the Shannon Trough, although it is only weakly developed or even absent on the undeformed ‘flats’ of the County Clare Mouth of the Shannon Kerry Head Dingle Bay Killarney-Mallow 8 km N Bantry Bay South Coast S Sea level –8 km Upper Carboniferous marine siliciclastics Lower Carboniferous limestones and siliciclastics Middle to Upper Devonian Old Red Sandstone Fig.

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