Discussion on the relationship between bitumens and mineralization in the South Pennine Orefield, central England

Article Abstract:

D.G. Quirk disagrees with the theory of G. Ewbanks, D.A.C. Manning and G.D. Abbott that the South Pennine Orefield was not created via gravity-induced, basin-wide fluid flow but through several episodes of dewatering caused by overpressured Lower Namurian mudstones. Quirk used potassium-argon dating to suggest that the orefield was formed in a span of approximately 0.7 million years at the end of the Carboniferous age and that the dewatering theory is invalid because at least 2000 km3 of orefluid passed through the Dinantian carbonates.

Usage, Causes of, Bituminous materials, Potassium-argon dating, Mineral lands

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Discussion on Caledonian plutonism and major lineaments in the SW Scottish highlands

Article Abstract:

The critics' model for the spatial distribution of Newer Granites in the Scottish Highlands does not fit the proposed model for the emplacement of the Ben Nevis Complex. The theory that the Rannoch Moor Lineament affected the siting of the complex, as evidenced by the north-south orientation of individual intrusive phases amounts to an oversimplification of a highly complex pluton.

Research, Highlands (Scotland), Intrusions (Geology)

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Discussion on Ordovician palaeogeography of Siberia and adjacent continents

Article Abstract:

The proposed 'alternative approach' to Ordovician geography can describe the geology of areas south of New England and of Western South America much better than the 'archetypal scenario.' Its explanations of key geological issues are based mainly on the role of 'Laurentia' in the Rodinian supercontinent and do not in any way contradict the premises of traditional models.

Models, Paleontology, Continental drift, Paleogeography, Laurasia (Geology), Laurasia, Ordovician period

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