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 some of the most visited box parts on this planet. It presents an awesome chance for interpreting quite a lot 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 gentle sediment deformation beneficial properties and sediments that reveal a reaction to tectonic and sea-level controls.

This box consultant presents the 1st synthesis of the central localities during this quarter of Western eire, and provides an simply obtainable guide that would advisor the reader to, and inside of, a variety of sedimentary facies, permitting an realizing of the evolving nature of the fill of this Carboniferous basin and the context of its sedimentary and tectonic evolution. The advisor summarizes contemporary and new paintings within the zone via various 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 instructing and study by means of educational researchers, specialist 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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Additional resources for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland

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2014). The region was probably emergent during some of this time, as evidenced by rare, reworked lime­ stone pebbles that occur in the Phosphate Bed; but the renewed onset of subsidence was not compensated by sediment infill until the onset of black shale accumulation. 5 mm kyr−1, water depths of ~ 200 m could have been achieved in northern County Clare prior to black shale deposition. Subsidence rates were undoubtedly higher in southern County Clare, but here subsidence was compensated for by the accumulation of hundreds of metres of black shales and turbidites.

However, Pulham’s own data clearly shows that nearly all the palaeocurrents in the Tullig Cyclothem record flow to the north‐east (Pulham, 1989, fig.  19). 1. Reconstruction of depositional conditions during Namurian infill of the Shannon Basin, based on the WiBe model (after Wignall & Best, 2000, 2002). Contours, labelled 1 to 3 from shallow to deep, show slope orientations, whilst the large grey arrows show dominant sediment dispersal directions. A) the Ross Sandstone Formation turbidite system; B) the Gull Island Formation slope system, with slumps and slides; C) the Tullig Cyclothem deltaic system.

It is difficult to account for the acquired burial temperatures by tectonic overburden and it thus seems probable that some form of advective heating was involved. Chapter 3 Basin Models PAUL B. 1 Introduction The outcrops of the Shannon region provide some of the best Carboniferous sections to be seen in north‐west Europe. They are also amongst the most debated. Basin style is an especially contentious issue and several conflicting, and to some extent irreconcilable, models have been proposed.

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