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Contrasting clay mineral assemblages in British Lower Palaeozoic slate belts: the influence of geotectonic setting

Published online by Cambridge University Press:  09 July 2018

R. J . Merriman
R. J . Merriman*
Affiliation:
British Geological Survey, KeyworthNottingham NG12 5GG, UK
*
*E-mail: [email protected]
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Abstract

Regional differences in clay mineralogy are found in British Lower Palaeozoic slate belts formed during Caledonian terrane amalgamation. Extensional basins in Wales, the northern Lake District and the Isle of Man are characterized by a greater diversity of species in clay mineral assemblages. Slates that evolved in these basins contain both the K- and Na-rich products of the 2:1 dioctahedral reaction series. Pyrophyllite, rectorite and corrensite are sporadically distributed but kaolinite is rarely recorded even in lowest-grade mudstones. In contrast, clay assemblages that evolved in the convergent basins of the Scottish Southern Uplands and northern England generally contain fewer mineral species, and Na-micas and pyrophyllite are rare or absent. Na-bearing clays may have been generated from low-temperature mixing of hydrothermal fluids and seawater in the extensional basins. Such fluids appear to have been unavailable in the convergent basins through lack of volcanic activity in the early stages of basin development.

Keywords

clay mineral assemblagesreaction seriesslate beltsextensional and convergent basins
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 2 , June 2002 , pp. 207 - 219
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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References

Ahn, J.H. & Peacor, D.R. (1986) Transmission and analytical electron microscopy of the smectite-to-illite transition. Clays and Clay Minerals, 34, 165–179.Google Scholar
Alt, J.C. & Teagle, D.A.H. (1998) Probing the TAG hydrothermal mound and stockwork: oxygen-isotope profiles from deep ocean drilling. Pp. 285–295 in. Proceedings of the Ocean Drilling Program, Scient ific Results 158, (Herzig, P.M., Humphris, S.A., Miller, D.J. & Zierenberg, R.A., editors).Google Scholar
Árkai, P. (1991) Chlorite crystallinity: an empirical approach and correlation with illite crystallinity, coal rank and mineral facies as exemplified by Palaeozoic and Mesozoic rocks of northeast Hungary. Journal of Metamorphic Geology, 9, 723–734.CrossRefGoogle Scholar
Armstrong, H.A. & Owen, A.W. (2001) Terrane evolution of the paratectonic Caledonides of northern Britain. Journal of the Geological Society of London, 158, 475–486.Google Scholar
Barnes, R.P., Lintern, B.C. & Stone, P. (1989) Timing and regional implications of deformation in the Southern Uplands of Scotland. Journal of the Geological Society of London, 146, 905–908.Google Scholar
Bevins, R.E. & Merriman, R.J. (1988) Co-existing prehnite-actinolite and prehnite-pumpellyite facies assemblages in the Tal y Fan Metabasite Intrusion, North Wales: Implications for Caledonian metamorphism. Journal of Metamorphic Geology, 6, 17–39.CrossRefGoogle Scholar
Boles, J.R. & Franks, S.G. (1979) Clay diagenesis in Wilcox sandstones of southwest Texas: implications of smectite diagenesis on sandstone cementation. Journal of Sedimentary Petrology, 49, 55–70.Google Scholar
Bottrell, S.H., Greenwood, P.B., Yardley, B.W.D., Shepherd, T.J. & Spiro, B. (1990) Metamorphic and post-metamorphic fluid flow in the low-grade rocks of the Harlech Dome, north Wales. Journal of Metamorphic Geology, 8, 131–143.Google Scholar
Brearley, A.J. (1988) Chloritoid from low grade pelitic rocks in North Wales. Mineralogical Magazine, 52, 394–396.Google Scholar
Cocks, L.R.M., McKerrow, W.S. & Van Staal, C.R. (1997) The margins of Avalonia. Geological Magazine, 134, 627–636.Google Scholar
de Ligny, D. & Navrotsky, A. (1999) Energetics of kaolin polymorphs. American Mineralogist, 84, 506–516.Google Scholar
Dong, H., Hall, C.M., Halliday, A.N., Peacor, D.R., Merriman, R.J. & Roberts, B. (1997) 40Ar/39Ar dating of Late Caledonian (Acadian) metamorphism and cooling of K-bentonites and slates from the Welsh Basin, U.K. Earth and Planetary Science Letters, 150, 337–351.Google Scholar
Dong, H., Peacor, D.R., Merriman, R.J. & Kemp, S.J. (2002) Characterization and geological origin of the new mineral brinrobertsite, regularly interstratified R1 pyrophyllite/ smectite. Mineralogical Magazine (in press).Google Scholar
Drief, A. & Nieto, F. (2000) Chemical composition of smectites formed in clastic sediments: implications for the smecti te illite transfo rmation. Clay Minerals, 35, 665–678.Google Scholar
Essene, E.J. & Peacor, D.R. (1995) Clay mineral thermometry A critical perspective. Clays and Clay Minerals, 43, 540–553.CrossRefGoogle Scholar
Evans, J.A., Millar, I.L. & Noble, S.R. (1995) Hydration during uplift is recorded by reset Rb-Sr whole-rock ages. Journal of the Geological Society, London, 152, 209–212.Google Scholar
Fortey, N.J. (1989) Low grade metamorphism in the Lower Ordovician Skiddaw Group of the Lake District, England. Proceedings of the Yorkshire Geological Society, 47, 325–337.Google Scholar
Frey, M. (1987) The reaction-isograd kaolinite + quartz = pyrophyllite + H2O, Helvetic Alps, Switzerland. Schweizerische Mineralogische und Petrographische Mitteilungen, 67, 1–11.Google Scholar
Hirons, S.R & Roberts, B. (1999) Metamorphic survey of the 1:50,000 Kendal and Kirkby Lonsdale geological Sheets 39 and 49. British Geological Survey Technical Report WA/99/51. 30 pp., 2 figs.Google Scholar
Hirons, S.R., Roberts, B. & Merriman, R.J. (1997) Metamorphism of the Lower Palaeozoic rocks of the Carrick-Loch Doon region, southern Scotland. British Geological Survey Technical Report WG/97/25. 8 pp, 2 figs.Google Scholar
Ho, N.-C., Peacor, D.R. & van de Pluijm, B.A. (1999) Preferred orientation of phyllosilicates in Gulf Coast mudstones and relation to the smectite-to-illite transition. Clays and Clay Minerals, 47, 495–504.Google Scholar
Honnorez, J.J., Alt, J.C. & Humphris, S.E. (1998) Vivisection and autopsy of active and fossil hydrothermal alterations of basalt beneath and within the TAG hydrothermal mound. Pp. 231–254 in. Proceedings of the Ocean Drilling Program, Sci ent ific Resul ts 158 (Herzig, P.M., Humphris, S.A., Miller, D.J. & Zierenberg, R.A., editors).Google Scholar
Howells, M.F., Reedman, A.J. & Campbell, S.D.G. (1991) Ordovician (Caradoc) marginal basin volcanism in Snowdonia (north-west Wales). HMSO for the British Geological Survey. London.Google Scholar
Hower, J., Eslinger, E.V., Hower, M.E. & Perry, E.A. (1976) Mechanism of burial metamorphism of argillaceous sediments: Mineralogical and chemical evidence. Geological Society of America Bulletin, 87, 725–737.Google Scholar
Huang, W.-L., Longo, J.M. & Pevear, D.R. (1993) An experimentally derived model for smectite-to-illite conversion and its use as a geothermometer. Clays and Clay Minerals, 41, 162–177.CrossRefGoogle Scholar
James, R.H. & Palmer, M.R. (2000) Marine geochemical cycles of the alkali elements and boron: The role of sediments. Geochimica et Cosmochimica Acta, 64, 3111–3122.Google Scholar
Jiang, W.-T. & Peacor, D.R. (1993) Formation and modification of metastable intermediate sodium potassium mica, paragonite and muscovite in hydrothermally altered metabasites from northern Wales. American Mineralogist, 78, 782–793.Google Scholar
Jiang, W.-T., Peacor, D.R., Merriman, R.J. & Roberts, B. (1990) Transmission and analytical electron microscopic study of mixed-layer illite/smectite formed as an apparent replacement product of diagenetic illite. Clays and Clay Minerals, 38, 449–468.CrossRefGoogle Scholar
Johnson, E.W., Soper, N.J. & Burgess, I.C. (2002) Geology of the Country Around Ulverston. Memoir for 1:50,000 Geological Sheets 48 (England & Wales). The Stationery Office for the British Geological Survey. London (in press).Google Scholar
King, L.M. (1994) Subsidence analysis of Eastern Avalonian sequences: implications for Iapetus closure. Journal of the Geological Society, London, 151, 647–657.Google Scholar
Kneller, B.C. & Bell, A.M. (1993) An Acadian mountain front in the English Lake District: the Westmorland Monocline. Geological Magazine, 130, 203–213.Google Scholar
Kneller, B.C., King, L.M. & Bell, A.M. (1993) Foreland basin development and tectonics on the northwest margin of eastern Avalonia. Geological Magazine, 130, 691–697.CrossRefGoogle Scholar
Knipe, R.J. (1981) The interaction of deformation and metamorphism in slates. Tectonophysics, 78, 249–272.CrossRefGoogle Scholar
Leggett, J.K., McKerrow, W.S. & Eales, M.H. (1979) The Southern Uplands of Scotland: a Lower Palaeozoic accretionary prism. Journal of the Geological Society, London, 136, 755–770.Google Scholar
Li, G., Peacor, D.R., Merriman, R.J. & Roberts, B. (1994a) The diagenetic to low grade metamorphic evolution of matrix white micas in the system muscoviteparagonite in a mudrock from Central Wales, U.K. Clays and Clay Minerals, 42, 369–381.Google Scholar
Li, G., Peacor, D.R., Merriman, R.J., Roberts, B. & Van der Pluijm, B.A. (1994b) TEM and AEM constraints on the origin and significance of chlorite-mica stacks in slates: an example from Central Wales, U.K. Journal of Structural Geology, 16, 1139–1157.Google Scholar
McKerrow, W.S., Leggett, J.K. & Eales, M.H. (1977) Imbricate thrust model of the Southern Uplands of Scotland. Nature, 267, 237–239.Google Scholar
McKerrow, W.S., MacNiocaill, C. & Dewey, J.F. (2000) The Caledonian Orogeny redefined. Journal of the Geological Society, London, 157, 1149–1154.Google Scholar
Merriman, R.J. & Frey, M. (1999) Patterns of very lowgrade metamorphism in metapelitic rocks. Pp. 61–107 in: Low-Grade Metamorphism (Frey, M. & Robinson, D., editors). Blackwell Science, Oxford, UK.Google Scholar
Merriman, R.J. & Peacor, D.R. (1999) Very low-grade metapelites; mineralogy, microtextures and measuring reaction progress. Pp. 10–60 in: Low-Grade Metamorphism (Frey, M. & Robinson, D., editors). Blackwell Science, Oxford, UK.Google Scholar
Merriman, R.J. & Roberts, B. (1985) A survey of white mica crystallinity and polytypes in pelitic rocks of Snowdonia and Llyn, N. Wales. Mineralogical Magazine, 49, 305–319.Google Scholar
Merriman, R.J. & Roberts, B. (2001) Low-grade metamorphism in the Scottish Southern Uplands terrane: deciphering the patterns of accretionary burial, shearing and cryptic aureoles. Transactions of the Royal Society of Edinburgh: Earth Sciences, 91, 521–537.Google Scholar
Merriman, R.J., Roberts, B. & Peacor, D.R. (1990) A transmission electron microscope study of white mica crystallite size distribution in a mudstone to slate transitional sequence, North Wales, U.K. Contributions to Mineralogy and Petrology, 106, 27–40.Google Scholar
Merriman, R.J., Rex, D.C., Soper, N.J. & Peacor, D.R. (1995a) The age of Acadian cleavage in northern England, UK: K-Ar and TEM analysis of a Silurian metabentonite. Proceedi ngs of the Yorkshire Geological Society, 50, 255–265.Google Scholar
Merriman, R.J., Roberts, B., Peacor, D.R. & Hirons, S.R. (1995b) Strain-related differences in the crystal growth of white mica and chlorite: a TEM and XRD study of the development of metapelite microfabrics in the Southern Uplands thrust terrane, Scotland. Journal of Metamorphic Geology, 13, 559–576.Google Scholar
Milodowski, A.E. & Zalasiewicz, J.A. (1991) The origin, depositional and prograde evolution of chlorite-mica stacks in Llandovery sediments of the central Wales Basin. Geological Magazine, 128, 263–278.Google Scholar
Morse, J.S. & Casey, W.H. (1988) Ostwald processes and mineral paragenesis in sediments. American Journal of Science, 288, 537–560.Google Scholar
Neuhoff, P.S., Watt, W.S., Bird, D.K. & Pedersen, A.K. (1997) Timing and structural relations of regional zeolite zones in basalts of the East Greenland continental margin. Geology, 25, 803–806.Google Scholar
Ogawa, Y. (1998) Tectonostratigraphy of the Glen App area, Southern Uplands, Scotland: anatomy of an Ordovician accretionary complex. Journal of the Geological Society, London, 155, 651–662.Google Scholar
Peacor, D.R. (1992) Diagenesis and low-grade metamorphism of shales and slates Pp. 335–380 in. Minerals and Reactions at the Atomic Scale: Transmission Electron Microscopy (Buseck, P.R., editor). Reviews in Mineralogy, 27. Mineralogical Society of America, Washington, D.C.Google Scholar
Pharaoh, T.C. (1999) Palaeozoic terranes and their lithospheric boundaries with the Trans-European Suture Zone (TESZ): a review. Tectonophysics, 314, 17–41.Google Scholar
Pharaoh, T.C., Merriman, R.J., Webb, P.C. & Beckinsale, R.D. (1987) The concealed Caledonides of eastern England: preliminary results of a multidisciplinary study. Proceedings of the Yorkshire Geological Society, 46, 355–369.Google Scholar
Pharaoh, T.C., Merriman, R.J., Evans, J.A., Brewer, T.S., Webb, P.C. & Smith, N.J.P. (1991) Early Palaeozoic arc-related volcanism in the concealed Caledonides of southern Britain. Annales de la Sociétéde Belgique, 114, 63–91.Google Scholar
Power, G.M. & Barnes, R.P. (1999) Relationships between metamorphism and structure on the northern side edge of eastern Avalonia in the Manx Group, Isle of Man. Pp.289–305 in. In Sight of the Suture: the Palaeozoic Geology of the Isle of Man in its Iapetus Ocean Context (Woodcock, N.H., Quirk, D.G., Fitches, W.R. & Barnes, R.P., editors). Special Publication 160, Geological Society, London.Google Scholar
Roberts, B., Evans, J.A., Merriman, R.J. & Smith, M. (1989) Discussion on: Bevins, R.E. & Robinson, D. (1988) Low grade metamorphism of the Welsh Basin Lower Palaeozoic succession: an example of diastathe rmal metamorphi sm. Journa l of the Geological Society, London, 146, 885–890.Google Scholar
Roberts, B., Morrison, C. & Hirons, S. (1990) Low grade metamorphism of the Manx Group, Isle of Man: a comparative study of white mica ‘crystallinity’ techniques. Journal of the Geological Society, London, 147, 271–277.CrossRefGoogle Scholar
Roberts, B., Merriman, R.J. & Pratt, W. (1991) The relative influences of strain, lithology and stratigraphical depth on white mica (illite) crystallinity in mudrocks from the district centred on the Corris Slate Belt, Gwynedd-Powys. Geological Magazine, 128, 633–645.Google Scholar
Roberts, B., Merriman, R.J., Hirons, S.R., Fletcher, C.J.N. & Wilson, D. (1996) Synchronous very low grade metamorphism, contraction and inversion in the central part of the Welsh Lower Palaeozoic Basin. Journal of the Geological Society, London, 153, 277–286.Google Scholar
Robinson, D. & Bevins, R.E. (1986) Incipient metamorphism in the Lower Palaeozoic marginal basin of Wales. Journal of Metamorphic Geology, 4, 101–113.Google Scholar
Smellie, J.L., Roberts, B. & Hirons, S.R. (1996) Very lowand low-grade metamorphism in the Trinity Peninsula Group (Permo-Triassic) of northern Graham Land, Antarctic Peninsula. Geological Magazine, 133, 583–594.Google Scholar
Smith, N.J.P. & Rushton, A.W.A. (1993) Cambrian and Ordovician stratigraphy related to structure and seismic profiles in the western part of the English Midlands. Geological Magazine, 130, 665–671.Google Scholar
Soper, N.J., Webb, B.C. & Woodcock, N.J. (1987) Late Caledonian (Acadian) transpression in north West England: timings, geometry and geotectonic significance. Proceedings of the Yorkshire Geological Society, 46, 175–192.Google Scholar
Thomas, L.J. (1986) Low grade metamorphism of the Lake District, England. PhD thesis, Univ. of St. Andrews, UK.Google Scholar
Velde, B. & Vasseur, G. (1992) Estimation of the diagenetic smectite to illite transformation in timespace. American Mineralogist, 77, 967–976.Google Scholar
Wei, H., Roaldset, E. & Bjory, M. (1996) Parallel reaction kinetics of smectite to illite conversion. Clay Minerals, 31, 365–376.Google Scholar
West, G. (1999) The distribution of natural stones in western Europe. Geology Today, 15, 68–71.Google Scholar
Woodcock, N.H. & Pharaoh, T.C. (1993) Silurian facies beneath East Anglia. Geological Magazine, 130, 681–690.CrossRefGoogle Scholar
Woodcock, N.H. & Strachan, R.A. (2000) The Caledonian Orogeny: a multiple plate collision. Pp.187–296 in: Geological History of Britain and Ireland (Woodcock, N.H. & Strachan, R.A., editors). Blackwell Science, Oxford.Google Scholar
You, C.F., Chan, L.H., Spivack, A.J. & Gieskes, J.M. (1995) Lithium, boron, and their isotopes in sediments and pore waters of Ocean Drilling Program Site 808, Nankai Trough: Implication for fluid expulsion in accretionary prisms. Geology, 23, 37–40.Google Scholar
Zhang, H. & Banfield, J.F. (1999) New kinetic model for the nanocrystalline anatase-to-rutile transformation revealing rate dependence on number of particles. American Mineralogist, 84, 528–535.Google Scholar