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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Shepherd, Adrian
Languages: English
Types: Unknown
The Lizard Complex consists of a poorly exposed assemblage of serpentinites, gabbros, amphibolites, basic dykes, metasediments and gneisses. As an alternative approach to conventional mapping of the inland area, the geochemistry of the residual soils of the area are used to identify the underlying lithologies. Using multi-element geochemical data obtained by X-ray fluorescence spectrometry, an identification scheme is established which allows the recognition of over a dozen mappable units with a high rate of success. This scheme evolved from a training set of samples collected during an orientation survey from areas of undisputed geology immediately adjacent to coastal exposure. At approximately 250 sites it has been possible to confirm the geological predictions directly against material obtained from the base of power auger holes. A non-hierarchical K-means clustering technique is developed and used to recluster data from over 800 samples into gabbroic and ultrabasic groups. The results of this classification produced more sensitive discriminatory parameters which in turn are used on 1500+ samples collected during the project. The soil identification procedure combines the use of a variety of numerical techniques and the algorithm designed to use them operates in a sequential manner. The most distinct units are identified at an early stage whilst those samples which are less distinct chemically take longer to isolate and as a final stage of treatment are separated using a modified K-means technique. This approach to mapping has allowed the recognition of units not found outcropping on coastal sections and for an improved geological map of the Lizard Complex to be drawn. In particular the Crousa gabbro is shown to be a smaller body than previously considered and to comprise several different bodies. As a result of this work the evolutionary history of the Complex is revised.
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    • K-means technique. This 1972. Geobotany and biogeochemistry in mineral exploration. Harper Row, New York.
    • Butler, J. R. 1953. The geochemistry and mineralogy of rock weathering (1). The Lizard area, Cornwall. Geochim. Cosmoch. Acta, 4: 157-178.
    • Cacoullos, T. and Styan, P. H. 1973. A bibliography of discriminant analysis. In: T. Cacoullos (Editor), Discriminant analysis and applications. Academic Press, New York.
    • Carr, P. T. 1960. The Treleague quartzite and its associations (Abstract). Proc. Conf. Geol. Geomorph. SW.England, R. Geol. Soc. Cornwall, 9-11.
    • Catt J. A. and Staines, S. J. 1982. Loess in Cornwall. Proc. Ussher. Soc., 5: 368-375.
    • Coleman, R. G. 1977. Ophiolites. Springer-Verlag, Berlin.
    • Coombe, D. E. and Frost, L. C. 1956. The nature and origin of the soils over the Cornish serpentine. J. Ecol., 44: 605-615.
    • Cormack, R. M. 1971. A review of classification. J. Roy. Stat. Soc., A134: 321-367.
    • Curry, D., Hamilton, D. and Smith, A. J. 1970. Geological and shallow subsurface geophysical investigations in the Western Approaches to the English Channel. Rep. No. 70/3, Inst. Geol. Sci., HMSO, London.
    • Davies, J. R. 1984. Isotopic evolution of the Lizard Complex. J. Geol. Soc. London, 141: 3-14.
    • Davis, J. G. 1973. Statistics and data analysis in geology. J. Wiley, New York.
    • Davison, E. H. 1925. Platinum in the Lizard District. Min. Mag., 33: 89-90.
    • Deer, W. A., Howie, R. A. and Zussman, J. 1966. An introduction to the rock forming minerals. Longman, London.
    • De la Beche, H. T. 1839. Report on the geology of Cornwall, Devon and W.Somerset. HMSO, London.
    • Dodson, M. H. 1961. Isotopic ages from the Lizard Peninsula, South Cornwall. Proc. Geol. Soc. London, 1591: 13-136.
    • Draper, N. R. and Smith, H. 1966. Applied regression analysis. John Wiley, New York.
    • Duncumb, P. and Jones, E. M. 1969. Tube Investments Company Report No. 260.
    • Dunstan, F. D. J., Nix, A. B. J. and Reynolds, J. F. 1979. Statistical tables. R. N. D. Publications, Cardiff.
    • Edwards, A. B. 1965. Textures of the are minerals and their significance. Australasian IMM.
    • Ermolenko, N. F. 1972. Trace elements and colloids in soils. Israel Program for Scientific Translation, Jerusalem.
    • Fieldes, M. and Swindale, L. D. 1954. Weathering of primary rock-forming minerals. New Zealand J. Sci. Tech., 368: 140-154.
    • Fitzpatrick, E. A. 1971. Pedology. A systematic approach to soil science. Oliver and Boyd, Edinburgh.
    • Flett, J. S. and Hill, J. B. 1912. Geology of the Lizard and Meneage (1-1- Ed). Mem.Geol. Surv. GB., HMSO, London.
    • Kirby, G. A. 1979. The Lizard Complex as an ophiolite. Nature, 262: 58-61.
    • Kirby, G. A. 1984. The petrology and geochemistry of the of the Lizard Ophiolite Complex, Cornwall. J. Geol. Soc. London, 141: 53-59.
    • Koch, G. S. and Link, R. F. 1971. Statistical analysis of geological data (Vol 2). John Wiley, New York.
    • Wilson, J. R., Coats, J. S., Aucott, J. W., Lunel, T. and Howarth, R. J. 1969. The chemical analysis of rock powders by automatic X-ray fluorescence. Chem.Geol., 5: 7-86.
    • Leake, B. E. 1978. Nomenclature of amphiboles. Mineral. Mag., 42: 533-563.
    • Leake, R. C. and Styles, M. T. 1984. Borehole sections through the Traboe hornblende schists, a cumulate complex overlying the Lizard peridotite. J. Geol. Soc. London, 141: 41-52.
    • Lebart, L., Morineau, A. and Warwick, K. M. 1984. Multivariate descriptive statistical analysis. J. Wiley, New York.
    • Le Maitre, R. W. 1973. Experiences with CLIAR: a computerised library of analysed igneous rocks. Chem.Geol., 12: 301-308.
    • Le Maitre, R. W. 1982. Numerical Petrology: Statistical interpretation of numerical data. Elsevier, Amsterdam.
    • Langley, J. W. 1967. An appraisal of least squares programs for the electronic computer from the point of view of the user. J. Amer. Stat. Soc., 62: 819-841.
    • MacQueen, J. B. 1967. Some methods for classification and analysis of multivariate observations. Proc. Symp. Math. Statist-and Probability, 5=1, Berkeley, 1: 281-297. Univ. of California Press, Berkeley.
    • Majendie, A. 1818. A sketch of the geology of the Lizard District. Trans. Roy. Geol. Soc. Corn., 1: 32-37.
    • Malloch, A. J. C. 1972. Salt spray deposition on the maritime cliffs of the Lizard peninsular. J. Ecol., 60: 103-112.
    • Marriott, F. H. C. 1974. The interpretation of multiple observations. Academic Press, London.
    • Mather, P. M. 1976. Computational methods of multivariate analysis in physical geography. John Wiley, London.
    • Mazzucchelli, R. H. and James, C. H. 1966. Arsenic as a guide to gold mineralization in laterite-covered areas of Western Australia. Trans. IMM (Sect. B, Appl. Earth Sci. ), 75: 286-294. Discussion; 76: 127-129.
    • Meisel, W.S. 1972. Computer-orientated approaches to pattern recognition. Academic Press, New York.
    • Miesch, A. T. 1967. Theory of errors in geochemical data. Prof. Pap. US. Geol. Surv., 574-A: 1-17.
    • Miller, J. A. and Green, D. H. 1961a. Preliminary age determinations in the Lizard area. Nature, 191: 159-160.
    • Miller, J. A. and Green, D. H. 1961b. Age determinations of rocks in the Lizard (Cornwall) area. Nature, 192: 1175-1176.
    • Millot, G. 1970. Geology of Clays. Springer-Verlag, Berlin.
    • Mitchell, G. F. 1960. The Pleistocene history of the Irish Sea. Advmt. Sci., 17: 313-325.
    • Mitchell, R. L. 1972. Trace affect their availability.
    • Nicolas, A. and Jackson, E. D. 1972. Repartion en deux provinces des peridotites des chaines alpines logeant la Mediterranee: Implications geotechnique. Schweiz Min. und. Pet. Mitt., 52: 479-495.
    • Pearce, J. A. and Cann, J. R. 1973. Tectonic volcanic rocks determined using trace element Earth Planet. Soc. Lett, 19: 290-300.
    • Pearce, T. H., Gorman B. E. and Birkett, T. C. 1975. The TiOa-K2O-P2Oe diagram; a method of discriminating between oceanic and non-oceanic basalts. Earth Planet. Lett., 24: 419-426.
    • Reid, C. 1890. The Pliocene deposits of Great Britain. Mem.Geol. Surv. UK.
    • Reid, C. and Scrivenor, J. B. 1906. Geology of the country near Newquay. Mem.geol. Surv. UK.
    • Rollin, K. E. and Tombs, J. M. C. 1978. Geophysical the Lizard 1977-78. Dept. of Industry, Mineral Programme S. W. England. Rept. No. 12.
    • Rollin, K. E. 1981. Geophysical surveys on the Lizard, 1978,1979. IGS Miner. Reconn. Programme.
    • Rothstein, A. T. V. 1971. A primary igneous Lizard peridotite, Cornwall. Geol. Mag.,
    • Rothstein, A. T. V. 1977. The distribution primary textures in the Lizard peridotite. 88: 93-105.
    • Rothstein, A. T. V. 1981. The primary crescumulates of the Lizard peridotite, Cornwall. Geol. Mag., 118: 491-500.
    • Sanders, L. D. 1955. Structural observations on the south-east Lizard. Geol. Mag., 92: 231-240.
    • Sanderson, D. J. and Dearman, W.R. 1973. Structural the Variscan fold belt in S. W.England, their location development. J. Geol. Soc. London, 129: 527-536.
    • Seager, A. F. 1970. Petrogenesis of hydrothermal minuralization in amphibolites and granulites around Porthkerris, the Lizard, Cornwall. Mineral. Mag., 42: 509-511.
    • Sedgwick, A. 1822. On the physical structure of the District. Trans. Comb. Phil. Soc., 1: 304.
    • Shervais, J. W. 1982. Ti-V plots and the petrogenesis of modern and ophiolitic lavas. Earth Planet. Sci. Lett., 59: 101-118.
    • Short, N. M. 1961. Geochemical variations in 4 residual J. Geol., 69: 534.
    • Simonson, R. W. 1978. A multiple process model of soil genesis. In: W.C. Mahaney (Editor). Quaternary soils. GeoAbstracts Ltd., Norwich. 1-26.
    • Simpson, G. G. 1961. Principles of animal taxonomy. University Press, New York.
    • Sinclair, A. J. 1976. Applications of probability mineral exploration. Sp. Vol. No4, Assoc. Explor. Rexdale, Ontario. E. J. W. 1977. Serpentine Can. Mineral., 15: 459-488.
    • Nature, 207: 343-538.
    • Wilson, J. T. 1965. continental drift.
    • Wintle, A. G. 1981. Nature, 289: 479-48iß.
    • Zeissink, H. E. 1969. laterite Mineral. (Editor). areas. 1977. and geochemistry of a (Greenvale, Queensland, 4: 132-152. The iron ore deposits of 1. Hannover. deposits related to the In: D. D. Klemm and H. J.
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