Hostname: page-component-84b7d79bbc-l82ql Total loading time: 0 Render date: 2024-07-31T06:37:36.175Z Has data issue: false hasContentIssue false
  • English
  • Français

Rare Alkali Elements in Trilobites

Published online by Cambridge University Press:  01 May 2009

W. S. McKerrow ,
S. R. Taylor ,
Audrey L. Blackburn  and
L. H. Ahrens
W. S. McKerrow
Affiliation:
Department of Geology and Mineralogy, Oxford.
S. R. Taylor
Affiliation:
Department of Geology and Mineralogy, Oxford.
Audrey L. Blackburn
Affiliation:
Department of Geology and Mineralogy, Oxford.
L. H. Ahrens
Affiliation:
Department of Geology and Mineralogy, Oxford.
Get access Rights & Permissions [Opens in a new window]

Abstract

Li, Rb, and Cs were determined spectrographically in twenty-eight trilobites, two xiphosurida, four insects, four Crustacea, and six brachiopods. The sediments associated with fifteen trilobites were also analysed. Compared with igneous and sedimentary rocks, the trilobites were characteristically enriched in cesium relative to rubidium and potassium. Thus, the K\Rb ratios were normal, but the Rb\Cs ratios were anomalously low. The evidence is considered to favour the view that cesium has been preferentially concentrated by trilobites during growth. The matrices had Rb\Cs ratios similar to normal sedimentary rocks.

Type
Articles
Information
Geological Magazine , Volume 93 , Issue 6 , December 1956 , pp. 504 - 516
Copyright
Copyright © Cambridge University Press 1956

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Ahrens, L. H., 1950. Spectrochemical Analysis. Cambridge, Mass.Google Scholar
Ahrens, L. H., 1954. Quantitative spectrochemical analysis of silicates. London.Google Scholar
Ahrens, L. H., Pinson, W. H., and Kearns, M. M., 1952. Association of rubidium and potassium and their abundance in common igneous rocks and meteorites. Geochim. et Cosmochim. Acta, ii, 229–242.CrossRefGoogle Scholar
Butler, A. J., 1940. The stratigraphy of the Wenlock Limestone of Dudley. Quart. Journ. Geol. Soc., xcv, 37–74.Google Scholar
Canney, F. C., 1952. Some aspects of the geochemistry of potassium, rubidium, cesium, and thallium in sediments. Bull. Geol. Soc. Amer., lxiii, 1238.Google Scholar
Chave, K. E., 1954. Aspects of the biogeochemistry of magnesium. I Calcareous marine organisms. Journ. Geol., lxii, 266–283.CrossRefGoogle Scholar
Clarke, F. W., and Wheeler, W. C., 1922. The inorganic constituents of marine invertebrates. U.S. Geol. Surv. Prof. Paper 124.Google Scholar
Fearon, W. R., 1946. Introduction to biochemistry. London.Google Scholar
Heilbrunn, L. V., 1952. Outline of general physiology. Philadelphia.Google Scholar
Herzog, L. F., and Pinson, W. H., 1955. The Sr and Rb contents of the granite G-1 and the diabase W-1. Geochim. et Cosmochim. Acta, viii, 295–8.CrossRefGoogle Scholar
Kulp, J. L., Turekian, K., and Boyd, D. W., 1952. Strontium content of limestones and fossils. Bull. Geol. Soc. Amer., lxiii, 701–716.CrossRefGoogle Scholar
Lipson, J. I., 1956. K-A dating of sediments. Geochim. et Cosmochim. Acta, x, 149–151.CrossRefGoogle Scholar
Richards, A. G., 1951. The integument of arthropods. Minneapolis.Google Scholar
Smales, A. A., 1955. Some trace-element determinations in G-1 and W-1 by neutron activation. Geochim. et Cosmochim. Acta, viii, 300.CrossRefGoogle Scholar
Smales, A. A. and Salmon, L., 1955. Determination by radioactivation of small amounts of rubidium and cesium in sea water and related materials of geochemical interest. Analyst, 80, 37–50.CrossRefGoogle Scholar
Vinogradov, A. P., 1953. The elementary composition of marine organisms. Mem. 2, Sears Foundation for Marine Research, New Haven, Conn.Google Scholar
Webb, D. A., 1937. Studies of the ultimate composition of biological material. Sci. Proc. Roy. Dublin Soc., xxi, 487–539.Google Scholar