Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-30T17:33:43.807Z Has data issue: false hasContentIssue false
  • English
  • Français

Age Determination of Carboniferous Basic Rocks of Shropshire and Colonsay

Published online by Cambridge University Press:  01 May 2009

W. D. Urry  and
Arthur Holmes
W. D. Urry
Affiliation:
Geophysical Laboratory, Washington, D.C.
Arthur Holmes
Affiliation:
University of Durham
Get access Rights & Permissions [Opens in a new window]

Extract

The helium method of determining the ages of fine-grained basic igneous rocks has now been so far developed as to be applicable to various geological and petrological problems, particularly where geological periods are involved, as in the problem here discussed. For details of the history of this development up to the beginning of 1937 reference may be made to Holmes, 1931; Urry, 1933; Lane and Urry, 1935; Urry, 1936 (b); Holmes and Paneth, 1936; and Holmes, 1937. During 1937 it was found that many of the helium-ratios on which the ‘helium’ time-scale had been based were too high, because of a previously unsuspected error in radium determination due to reliance having being placed on a radium standard which was seriously at fault. To clear up this embarrassing situation an immediate effort was made by several investigators in collaboration, and the first fruits of their work have recently become available (Evans, Goodman, Keevil, Lane, and Urry, 1939).

Type
Articles
Information
Geological Magazine , Volume 78 , Issue 1 , February 1941 , pp. 45 - 61
Copyright
Copyright © Cambridge University Press 1941

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

Bailey, E. B., 1924. In Tertiary and Post-Tertiary Geology of Mull, Loch Aline, and Oban. Mem. Geol. Surv., Scotland, 378.Google Scholar
Bailey, E. B., 1925. In The Geology of Staffa, Iona, and Western Mull. Mem. Geol. Surv., Scotland, 81.Google Scholar
Bailey, E. B., Eyles, V. A., and Simpson, J. B., 1930. In The Geology of Ardnamurchan, North-West Mull and Coll. Mem. Geol. Surv., Scotland, 358.Google Scholar
Brögger, W. C., 1921. Das Fengebiet in Telemark, Norwegen. Videns. Skrift. I, Math.-nat. Kl., 1920, Oslo, 186.Google Scholar
Dixon, B. E., 1927. In Summ. Prog. Geol. Surv. Gt. Britain for 1926, 77Google Scholar
Dixon, B. E., 1927. also in Chemical Analyses of Igneous Rocks…, Mem. Geol. Surv. Gt. Britain, 1931, 71, No. 272.Google Scholar
Evans, R. D., Goodman, C., Keevil, N. B., Lane, A. C., and Urry, W. D., 1939. Intercalibration and Comparison in Two Laboratories of Measurements Incident to the Determination of the Geological Ages of Rocks.Physical Review, 55, 931–946.CrossRefGoogle Scholar
Flett, J. S. 1911. In The Geology of Colonsay and Oronsay…. Mem. Geol. Surv., Scotland, 41 and 44.Google Scholar
Flett, J. S., 1935. In The Geology of the Orkneys. Mem. Geol. Surv., Scotland, 182–6.Google Scholar
Guppy, E. M., 1931. Chemical Analyses of Igneous Rocks, Metamorphic Rocks, and Minerals. Mem. Geol. Surv. Gt. Britain, 92.Google Scholar
Harker, A., 1918. Some Aspects of Igneous Action in Britain. Quart. Journ. Geol. Soc., 73, lxxxvi–lxxxvii.Google Scholar
Holmes, A., 1931. The Accumulation of Helium in Minerals, Rocks and Meteorites. In The Age of the Earth. Nat. Res. Council Bull. 80, Washington, 393–426.Google Scholar
Holmes, A. 1937. The Age of the Earth. Nelson Classics, London, 93–137.Google Scholar
Holmes, A. and Harwood, H. F., 1937. The Petrology of the Volcanic Area of Bufumbira. Geol. Surv. Uganda, Mem. III, Part II, 85 and Analysis No. 44.Google Scholar
Holmes, A. and Paneth, F. A., 1936. Helium-ratios of Rocks and Minerals from the Diamond Pipes of South Africa. Proc. Roy. Soc., London, A, 154, 385–413Google Scholar
Lane, A. C., and Urry, W. D., 1935. Ages by the Helium Method: I. Kevveenawan. Bull. Geol. Soc. Amer., 46, 1101–1120.CrossRefGoogle Scholar
MacGregor, A. G., 1928. The Classification of Scottish Carboniferous Olivine-basalts and Mugearites. Trans. Geol. Soc. Glasgow, 18, 352.Google Scholar
Macgregor, M., and MacGregor, A. G., 1936. The Midland Valley of Scotland. Geol. Surv. Handbook of Regional Geology, 63, 68–9.Google Scholar
Player, J. H. In The Petrology of the Igneous Rocks, by Hatch and Wells, 1937, 211. The analysis can also be found in earlier editions.Google Scholar
Pocock, R. W., 1926. The Basalt of Little Wenlock (Shropshire). Summ. Prog. Geol. Surv. Gt. Britain for 1925, 140–156.Google Scholar
Pocock, R. W., 1931. The Age of the Midland Basalts. Quart. Journ. Geol. Soc., 87, 1–12.CrossRefGoogle Scholar
Reade, T. M., and Holland, P., 1907. Analyses of Ludlow Rocks. Proc. Liverpool Geol. Soc., 10, 208.Google Scholar
Richey, J. E., 1939. The Dykes of Scotland. Trans. Edin. Geol. Soc., 13, 393–435.CrossRefGoogle Scholar
Tomkeieff, S. I., 1937. Petrochemistry of the Scottish Carboniferous-Permian Igneous Rocks. Bull. Vole., Napoli, Ser. II, 1, 59–87.CrossRefGoogle Scholar
Tyrrell, G. W., 1912. The Late Palaeozoic Alkaline Igneous Rocks of the West ot Scotland. Geol. Mag., 78.Google Scholar
Tyrrell, G. W., 1918. The Igneous Geology of the Ayrshire Coast from Doonfoot to the Heads of Ayr. Trans. Geol. Soc. Glasgow, 16, 339–363.CrossRefGoogle Scholar
Urry, W. D., 1933. Helium and the Problem of Geological Time. Chem. Reviews, 13, 305–343.CrossRefGoogle Scholar
Urry, W. D., 1936 (a). Determination of the Thorium Content of Rocks; and Determination of the Radium Content of Rocks. Journ. Chem. Phys., 4. 34–48CrossRefGoogle Scholar
Urry, W. D., 1936 (b). Ages by the Helium Method: II. Post-Keweenawan. Bull. Geol. Soc. Amer., 47, 1217–1234.CrossRefGoogle Scholar
Walker, F., 1934. The Term “Crinanite”. Geol. Mag., 71, 126.CrossRefGoogle Scholar
Wright, W. B., and Bailey, E. B., 1911. In The Geology of Colonsay and Oronsay… Mem. Geol. Surv., Scotland, 8.Google Scholar