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 develop into some of the most visited box parts on the earth. It offers an awesome chance for analyzing a variety of historic 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 realm boasts huge outcrops and a few of the main popular sections via turbidites, large-scale smooth sediment deformation beneficial properties and sediments that demonstrate a reaction to tectonic and sea-level controls.

This box consultant presents the 1st synthesis of the important localities during this zone of Western eire, and provides an simply obtainable instruction manual that would advisor the reader to, and inside of, quite a lot 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 consultant summarizes fresh and new paintings within the zone via a number authors and descriptions problems with present debate in regards to the Shannon Basin and its palaeoenvironmental interpretation. the sector consultant will locate large use in instructing and learn through educational researchers, expert and beginner geologists, in addition to by means of 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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Reproduced with permission from the Geological Society of London. 3C). The cleavage is locally a penetrative fabric in mudrocks, particularly in fold hinges in the southern part of the basin. The pressure solution cleavage is partly a temperature‐controlled fabric that is typical of rocks that have been moderately hot at temperatures < 350 to 400° C, at which temperatures crystal plastic processes start to dominate (Rutter, 1976, 1978). Such fabrics can develop in areas of relatively low strain, such as County Clare, if palaeotemperatures were sufficiently high.

Pertinent areas for debate include: 1 What was the nature of the northern County Clare sections? In particular, are the Namurian strata in this region deeper or shallower water than the equivalent strata exposed around the Shannon Estuary? The interpretation of the Clare Shale in northern County Clare is especially contentious. In the WiBe model, the black shales are deep water, low energy deposits accu­ mulated in a distal basinal setting, whilst the other models suggest high energy, winnowed accumulation on a basin margin.

However, the lack of granites near the suture zone makes isotopic methods less applicable. 2A). 3. , 1992).  30° N. This is taken to represent the northward subduction of the Leinster Terrane beneath the Longford‐Down and the zone coincides geographically with the Shannon Estuary. This interpretation is supported by evidence from xenoliths in lamprophyre dykes in the Longford‐Down which have been used to suggest under‐thrusting by Leinster type crust (Anderson & Oliver, 1996). Xenoliths from Lower Carboniferous volcanic pipes that occur above the Iapetus Suture Zone have also been compared to Avalonian basement (Van den Berg, 2005).

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