Abstract
Layered limestones of the Sligo Syncline in NW Ireland indicate that the limestone-shale alternations are largely of diagenetic origin. The centre of limestone layers generally consists of largely pure calcium carbonate. This light-grey limestone is often enveloped by chert. The outer parts of the layers are composed of dark-grey limestone with an increasing dolomite content towards the margins.
Metastable components of modern lime muds are aragonite, biogenous silica, and Mg-calcite. In this order they are dissolved and precipitated in the pore space of the mud forming limestone layers with the internal structure described above.
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Walther, M. (1982). A Contribution to the Origin of Limestone-Shale Sequences. In: Einsele, G., Seilacher, A. (eds) Cyclic and Event Stratification. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75829-4_9
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DOI: https://doi.org/10.1007/978-3-642-75829-4_9
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