Geology

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 probably the most visited box components on this planet. It offers a great chance for interpreting 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 world boasts large outcrops and a few of the main popular sections via turbidites, large-scale tender sediment deformation beneficial properties and sediments that exhibit a reaction to tectonic and sea-level controls.

This box advisor presents the 1st synthesis of the crucial localities during this sector of Western eire, and offers an simply available instruction manual that might advisor the reader to, and inside of, a variety of sedimentary facies, permitting an figuring out of the evolving nature of the fill of this Carboniferous basin and the context of its sedimentary and tectonic evolution. The consultant summarizes contemporary and new paintings within the sector through various authors and descriptions problems with present debate in regards to the Shannon Basin and its palaeoenvironmental interpretation. the sector advisor will locate wide use in educating and examine by means of educational researchers, specialist and novice geologists, in addition to by way of utilized geologists, geophysicists and reservoir engineers who use those outcrops as analogues for subsurface reservoirs in lots of components of the world.

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

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26 Chapter 2 (A) (B) Fig. 3. A) Typical open fold in Mississippian carbonates of the Burren, Mullaghmore (Photo taken from UTM 498989 m E 5872143 m N; Map 51, 131898 m E, 194683 m N). B) Anticline in Ross Sandstone Formation at Bridges of Ross (UTM 440853 m E 5827157 m N; Map 63, 073110 m E, 150486 m N). box folds. Cleavage also gradually decreases in intensity and occurrence northwards. 3F, G and H) that is generally at a high angle to bedding in the competent limestone and sandstone lithologies with marked fanning The Shannon Basin: Structural Setting and Evolution 27 (C) (D) Fig.

2011). 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.

4). Tanner et al. (2011) noted that the folds had statistically‐horizontal plunges and that the fold geometry was dependent on lithology. The thick sandstone beds of the Ross Sandstone Formation are characterised by box folds, whereas higher stratigraphic units are characterised by parallel folds, with the geometrical differences accommodated by the muddy Gull Island Formation. Tanner et al. 1) containing an algorithm that enabled de‐compaction of the section and substituted porosity data from comparative North Sea sediments, in an attempt to allow for over‐pressuring.

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