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The Age of Uraninite and Monazite from the Post-Delhi Pegmatites of Rajputana

Published online by Cambridge University Press:  01 May 2009

Arthur Holmes
Arthur Holmes
Affiliation:
(University of Edinburgh)
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Abstract

Uraninite and monazite collected by Dr. H. Crookshank from pegmatites occurring respectively at Bisundni and Soniana (Rajputana) have been analysed for U, Th, and Pb by Mr. A. A. Srnales, and the isotopic constitution of the lead separated from each mineral has been determined by Dr. W. T. Leland and Prof. A. O. Nier. The three ages calculated from the uraninite ratios AcD/RaG, RaG/U and AcD/U are 740, 733, and 733 m.y. The monazite is considerably altered but the corresponding ratios indicate that its age lies between 700 and 865 m.y., which is consistent with the more reliable estimate determined from the uraninite. It is shown from tectonic evidence that the Delhi erogenic belt is younger than the Satpura belt (previously dated at about 900 m.y.) and that both are younger than the Aravalli and Dharwar belts.

Type
Articles
Information
Geological Magazine , Volume 86 , Issue 5 , October 1949 , pp. 288 - 302
Copyright
Copyright © Cambridge University Press 1949

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References

REFERENCES

Ahrens, L. H., 1949. Measuring Geologic Time by the Strontium Method. Bull. Geol. Soc. Am., lx, 217–266.CrossRefGoogle Scholar
Coulson, A. L., 1933. The Geology of Sirohi State, Rajputana. Mem. Geol. Surv. India, lxiii (1), 1–166.Google Scholar
Crookshank, H., 1936. Geology of the Northern Slopes of the Satpuras between the Morand and the Sher Rivers. Mem. Geol. Surv. India, lvi (2), 173–381.Google Scholar
Crookshank, H., 1947. Presidential Address. Trans. Min. Geol. Met. Inst. India, xliii, 1–7.Google Scholar
Dunn, J. A., 1942. The Economic Geology and Mineral Resources of Bihar Province. Mem. Geol. Surv. India, lxxviii, 1–238.Google Scholar
Fermor, L. L., 1936. An Attempt at the Correlation of the Ancient Schistose Formations of Peninsular India. Mem. Geol. Soc. India, lxx (2), 53–217.Google Scholar
Gupta, B. C., 1934. The Geology of Central Mewar. Mem. Geol. Surv. India, lv (2), 107–169.Google Scholar
Heath, K. C. G., 1947. Suggestions for Mica Mining in Rajputana. Trans. Min. Geol. Met. Inst. India, xliii, 25–37.Google Scholar
Heron, A. M., 1935. Synopsis of the Pre-Vindhyan Geology of Rajputana. Trans. Nat. Inst. Sci. India, i (2), 17–33.Google Scholar
Holmes, A., 1918. The Pre-Cambrian and Associated Rocks of the District of Mozambique. Quart. Journ. Geol. Soc., lxxiv, 31–98.CrossRefGoogle Scholar
Holmes, A., 1948 a. The Oldest Known Minerals and Rocks. Trans. Edin. Geol. Soc., xiv, 176–194.CrossRefGoogle Scholar
Holmes, A., 1948 b. Monazite from Bodmin Moor, Cornwall: a Study in Geo-chronology. Part I—Monazite as a Geological Timekeeper. Proc. Roy. Soc. Edin., B, lxiii (II), 115–124.Google Scholar
Karunakaran, C., and Neelakantam, K., 1948. Samarskite from Nellore District. Part I—Uranium and Earth Acid Contents. Proc. Indian Acad. Sci., xxv, A, 1947, 404–7.Google Scholar
Karunakaran, C., and Neelakantam, K., 1948. Samarskite from Nellore District. Part II—Chemical Composition. Proc. Indian Acad. Sci., xxvii, 29–32.CrossRefGoogle Scholar
Keevil, N. B., 1939. The Calculation of Geological Age. Am. Journ. Sci., ccxxxviii, 195–214.CrossRefGoogle Scholar
Krishnan, M. S., 1935. The Dharwars of Chota Nagpur. XXII Indian Sci. Congress, Calcutta, Section of Geology, Presidential Address, vi, 1–29.Google Scholar
Krishnan, M. S., 1943 a. The Structure of India. Indian Geog. Journ., xviii, 137–155.Google Scholar
Krishnan, M. S., 1943 b. Geology of India and Burma. Madras, pp. 518.Google Scholar
Nier, A. O., 1938. The Isotopic Constitution of Calcium, Titanium, Sulphur, and Argon. Phys. Rev., liii, 282–6.CrossRefGoogle Scholar
Nier, A. O., 1939. The Isotopic Constitution of Radiogenic Leads and the Measurement of Geological Time. II. Phys. Rev., lv, 153–163.CrossRefGoogle Scholar
Nier, A. O., 1947. A Mass Spectrometer for Isotope and Gas Analyses. Rev. Sci. Inst., xviii, 398–411.CrossRefGoogle Scholar
Nier, A. O., Thompson, R. W., and Murphey, B. F., 1941. The Isotopic Constitution of Lead and the Measurement of Geological Time. III. Phys. Rev., lx, 112–16.CrossRefGoogle Scholar
Rama Rao, B., 1936. Recent Studies on the Archaean Complex of Mysore. XXIII Indian Sci. Congress, Indore, Section of Geol. and Geog., Presidential Address, iii, 1–30.Google Scholar
Sarkar, T. C., 1941. The Lead Ratio of a Crystal of Monazite from the Gaya District, Bihar. Proc. Indian Acad. Sci., xiii a, 245–8.CrossRefGoogle Scholar
Sarkar, P. B., and Sen Sarma, R. N. On some radioactive mineral of India and its geological age: Samarskite from Nellore. Science and Culture, 1946, xi, 569–570.Google Scholar
Schoeller, W. R., and Powell, A. R., 1940. Analysis of Minerals and Ores of Rarer Elements. London, 2nd edit., p. 85.Google Scholar
Schoep, A., 1927. Sur l'ianthinite, nouveau mineral uranifère. Ann. Soc. Geol. Belg., xlix (for 1926), B 188–B 192, and B 310–B 312.Google Scholar
Smales, A. A., 1948. Monazite from Bodmin Moor, Cornwall: a Study in Geochronology. Part II. Analysis of Bodmin Moor Monazite for Lead, Thorium, and Uranium. Proc. Roy. Soc. Edin., B, lxiii (II), 125–9.Google Scholar
West, W. D., 1934. Some Recent Advances in Indian Geology. Part I. The Archaean Rocks of Peninsular India. Current Science, iii, 137–144.Google Scholar
Wickman, F. E., 1939. Some Graphs on the Calculation of Geological Age. Sver. Geol. Undersök. Årsbok, xxxiii (1939), No. 7, 1–8.Google Scholar
Wickman, F. E., 1942. On the Emanating Power and the Measurement of Geological Time. Geol. Fören. Förh., Stockholm, lxiv, 465–476.CrossRefGoogle Scholar
Wickman, F. E., 1944. A Graph for the Calculation of the Age of Minerals according to the Lead Method. Sver. Geol. Undersök. Årsbok, xxxvii (1943), No. 7, 1–6.Google Scholar