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

By James L. Best, Paul B. Wignall

The Carboniferous Shannon Basin of Western eire has develop into the most visited box components on this planet. It presents an amazing chance for reading quite a lot of historical 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 wide outcrops and a few of the main popular sections via turbidites, large-scale delicate sediment deformation gains and sediments that show a reaction to tectonic and sea-level controls.

This box consultant offers the 1st synthesis of the imperative localities during this sector of Western eire, and provides an simply available instruction manual that might consultant the reader to, and inside of, a variety 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 consultant summarizes fresh and new paintings within the quarter by means of more than a few authors and descriptions problems with present debate about the Shannon Basin and its palaeoenvironmental interpretation. the sector consultant will locate huge use in educating and examine through educational researchers, specialist and novice geologists, in addition to via 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 resources for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland

Sample text

Distribution of vitrinite reflectance (Rm) in the Doonbeg No. 1 Well (after Clayton & Baily, 1999). Thus, the rocks of the Shannon Trough indicate relatively low levels of tectonic deformation but higher than expected burial temperatures, and there is some evidence that the peak temperatures preceded fold development. The overall stress regime was one of dextral transpression. 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.

Basin style is an especially contentious issue and several conflicting, and to some extent irreconcilable, models have been proposed. Each model differs in the implications it has for deposi­ tional conditions, the orientation of depositional systems and sediment provenance. All of these debates can be pondered when examining the outcrops detailed in this field guide, which provides a chance to see some of the key evidence and, we hope, allow the visitor to come to their own conclusions based on what they have seen.

5. , 1989). The Shannon Basin: Structural Setting and Evolution 33 shows high maturation values that appear to be independent of stratigraphic position and they also show little correlation to the amount of strain. , 1994). 5% and conodonts from limestone concretions have conodont alteration indices (CAI) of 5. These data suggest peak burial temperatures of 340 to 370° C. Such temperatures would be consistent with the development of the pressure solution cleavage. Clayton & Baily (1999) examined oriented coal blocks from the limbs of folds at Croan Rocks and Killard.

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