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Geochemistry of Lago Grande di Monticchio, S. Italy

  • C. Robinson
  • G. B. Shimmield
  • K. M. Creer
Geochemistry
Part of the Lecture Notes in Earth Sciences book series (LNEARTH, volume 49)

Abstract

This account describes the results of bulk geochemical analysis on the uppermost 15m of a 51m profile obtained from Lago Grande di Monticchio. This section is thought to extend from historic times back into the late Pleistocene, hence including the glacial-Holocene transition.

One of the clearest changes seen occurs in the organic carbon content of the sediment, rising from modest values in lower parts of the core to values as high as 30wt% at around 8m depth. In this zone, thought to be correlated with the glacial-Holocene transition, other elements vary directly (Br) or inversely (Al, Y) with organic carbon concentration. Multivariate techniques such as principal components analysis have been used to help identify these elemental associations. Such groupings are suggested as reflecting different contributors to the sediments (eg. plant matter, clays, residual minerals). The stable isotopic composition of organic carbon displays something of a shift towards lighter values across the glacial-Holocene transition zone, but the profile as a whole is difficult to interpret without further information on the nature of the organic matter. Several elements (P, Mn, Mo) exhibit enrichments in discrete temporal zones and it is thought that these are indicative of diagenetic processes occuring in the sediment.

Keywords

Electron Spin Resonance Lake Sediment Organic Carbon Content Biogenic Silica Diagenetic Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bortels, H. (1930): Molybdan als katalysator bei der biologischen Stickstoffbindung. Arch. Mikrobiol, 1 p333.CrossRefGoogle Scholar
  2. Brown, H.A. (1991): A palaeomagnetic, geochronological and palaeoenvironmental investigation of late and post glacial maar lake sediments from NW-Europe. PhD thesis, University of Edinburgh.Google Scholar
  3. Cosgrove, M.A. (1970): Iodine in the bituminous Kimmeridge shales of the Dorset coast, England. Geochim. Cosmochim. Acta, 34, p830.CrossRefGoogle Scholar
  4. Eggimann, D.W. et al. (1980): Dissolution and analysis of amorphous silica in marine sediments. J. Sed. Pet., v.50 No. 1, p215.Google Scholar
  5. Håkansson, S. (1985): A review of various factors influencing the stable carbon isotope ratio of organic lake sediments by the change from glacial to post-glacial environmental conditions. Quat. Sci. Reviews, 4, p135.CrossRefGoogle Scholar
  6. Harkness, D.D. & Walker, M.J.C. (1991): The Devensian Lateglacial carbon isotope record from Llanilid, South Wales. Quaternary Proc. No. 1, p35.Google Scholar
  7. Horie, S. (1972–81): Palaeolimnology of Lake Biwa and the Japanese Pleistocene. Proc. Jpn. Acad.Google Scholar
  8. Mackereth, F.J.H. (1965): Chemical investigation of lake sediments and their interpretation. Proc. Royal Soc. London, 161B p295.CrossRefGoogle Scholar
  9. Mackereth, F.J.H. (1966): Some chemical observations on post-glacial lake sediments. Phil. Trans. Royal Soc. London, 250B, p165.CrossRefGoogle Scholar
  10. Muller, P.J. (1977): C/N ratio in Pacific deep-sea sediments: Effect of inorganic ammonium and organic nitrogen compounds sorbed by clays. Geochim. Cosmochim. Acta, 41, p765.CrossRefGoogle Scholar
  11. Nakai, N. (1972): Carbon isotopic variation and the palaeoclimate of sediments from Lake Biwa. Proc. Jpn. Acad., 48, p516.Google Scholar
  12. Nriagu, J.O. & Dell, C.I. (1974): Diagenetic formation of iron phosphates in recent lake sediments. Ame. Mineralogist, 59, 934.Google Scholar
  13. O'Donnell, D. (1987): Geochemical cycles of trace elements in coastal sediments. PhD thesis, University of Edinburgh.Google Scholar
  14. Rieley, G. et al. (1991): Sources of sedimentary lipids deduced from stable carbon-isotope analyses of individual compound. Nature, 352, p425.CrossRefGoogle Scholar
  15. Stevenson F.J. & Cheng, C.-N. (1972): Organic geochemistry of the Argentine Basin sediments: carbon-nitrogen relationships and Quaternary correlations. Geochim. Cosmochim. Acta, 36, p653.CrossRefGoogle Scholar
  16. Stuermer, D.H. et al. (1978): Source indicators of humic substances and proto-kerogen. Stable isotope ratios, elemental compositions and electron spin resonance spectra. Geochim. Cosmochim. Acta, 42, p989.CrossRefGoogle Scholar
  17. Stuiver, M. (1975): Climate versus changes in 13C content of the organic component of lake sediments during the late Quaternary. Quaternary Research, 5, p251.CrossRefGoogle Scholar
  18. Truze, E. (1990): Etude sedimentologique et geochemique des depots du maar du Bouchet (Massif Central, France). Evolution d'un systeme lacustre au cours du dernier cycle climatique (0–120 000 ans). These, Universite d'Aix Marseille II.Google Scholar
  19. Turekian, K.K. & Wedepohl, K.H. (1961): Distribution of the elements in some major units of the earth's crust. Bull. Geol. Soc. America, 72, p175.CrossRefGoogle Scholar
  20. Vinogradov, A.P. (1959): The geochemistry of rare and dispersed chemical elements in soils, 2nd ed. New York: Consultants Bureau.Google Scholar
  21. Watts, W.A. (1985): A long pollen record from Laghi di Monticchio, southern Italy: a preliminary account. J. Geol. Soc. London, 142, p491.Google Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • C. Robinson
    • 1
  • G. B. Shimmield
    • 1
  • K. M. Creer
    • 1
  1. 1.Dept. of Geology and GeophysicsEdinburgh UniversityEdinburgh

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