Columnar-jointed bentonite below a Doleritic Sill, Tideswell Dale, Derbyshire, UK: formation during prograde contact metamorphism

Columnar-jointed tuffs (bentonites) are located below the Lower Carboniferous Tideswell Dale Sill, Derbyshire, in an abandoned quarry. There are three zones of prismatic joints, columnar joints (∼60 cm thick and mean column width of 4.1 cm) and massive, conchoidally fractured rock sequentially from...

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Veröffentlicht in:	Geological magazine 2020-07, Vol.157 (7), p.1181-1198
Hauptverfasser:	Mullineux, S, Sparks, RSJ, Murphy, MD, MacNiocaill, C, Barfod, D, Njorka, J, Schumacher, JC
Format:	Artikel
Sprache:	eng
Schlagworte:	absolute age Anatase Apatite Ar/Ar Bentonite Carboniferous chemical composition clastic rocks Clay Clay minerals columnar joints contact metamorphism dates Derbyshire England diabase Dimensions electron microscopy data electron probe data England Europe Ferric oxide fractures Geology Great Britain Haematite heating Hematite High level radioactive wastes high-level waste igneous and metamorphic rocks igneous rocks Illite Illites intrusions Joints (timber) Laboratories Lower Carboniferous Mesozoic Metamorphism Metamorphism (geology) mineral composition Minerals Montmorillonite Montmorillonites Original Article Oxidation Palaeomagnetism Paleomagnetism Paleozoic Petrology plutonic rocks prograde metamorphism protoliths pyroclastics Quarries radioactive waste Radioactive waste disposal Radioactive wastes Rocks sedimentary rocks SEM data sills Smectites spectra Tideswell Dale Triassic tuff United Kingdom Volcanic activity Volcanic ash volcanic rocks Volcanism waste disposal Western Europe X-ray diffraction data X-ray fluorescence spectra
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