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XIV.—The Kalsilite-bearing Lavas of Kabirenge and Lyakauli, South-West Uganda

Published online by Cambridge University Press:  06 July 2012

A. D. Combe  and
Arthur Holmes
A. D. Combe
Affiliation:
Geological Survey of Uganda.
Arthur Holmes
Affiliation:
University of Edinburgh
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Extract

The Western or Toro-Ankole volcanic province of Uganda consists of several areas of tuffs, explosion craters, and rare lava flows situated to the east and south-east of Ruwenzori (text-fig. 1). From north to south these volcanic fields are distinguished under the names (a) Rusekere; (b) Fort Portal; (c) Ndale, formerly known as the “Kyatwa area”; (d) Katwe-Kikorongo; (e) Bunyaruguru, formerly known as the “Kichwamba area”; and (f) Katunga. The Bunyaruguru field extends southwards from Lake George in and adjacent to the north-eastern portion of the Lake Edward section of the western rift. The Kabirenge and Lyakauli lavas (text-fig. 2) occur on the eastern edge of the rift depression immediately north-west of Nyondo crater (E. 30° 04′ 25″; S. 0° 14′ 30″). As a group, they constitute one of the four lava occurrences now known in Bunyaruguru, the other three being those of Chamengo, Mafuru, and Kazimiro (text-fig. 2). Otherwise, lava occurs only as fragments and lumps in the tuffs and as bombs and ejected blocks. The Kabirenge-Lyakauli lavas are also of special interest because, as described later by Professor Holmes, they consist of various members of the mafurite series, characterised by the presence of the recently discovered mineral kalsilite, a polymorph of KAlSiO4.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 61 , Issue 2 , 1947 , pp. 359 - 379
Copyright
Copyright © Royal Society of Edinburgh 1947

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References

References to Literature (Parts I and II)

Bannister, F. A., with chemical analyses by Hey, M. H., 1942. “Kalsilite, a polymorph of KAlSiO4, from Uganda,” Min. Mag., XXVI, 218–224.Google Scholar
Combe, A. D., 1930. “Recent volcanic area of Bunyaruguru,” Ann. Rept. Geol. Surv. Uganda for 1929, 16–18.Google Scholar
Combe, A. D., 1933. “Bunyaruguru volcanic area,” Ann. Rept. Geol. Surv. Uganda for 1932, 35–36.Google Scholar
Combe, A. D., 1934. “Some volcanoes in western Ankole,” Ann. Rept. Geol. Surv. Uganda for 1933, 63–69.Google Scholar
Combe, A. D., 1937. “The Katunga volcano, south-west Uganda,” Geol. Mag., LXXIV, 195–200.CrossRefGoogle Scholar
Combe, A. D., 1939. “The volcanic area of Bunyaruguru, north-western Ankole,” Ann. Rept. Geol. Sun. Uganda for 1938, 17.Google Scholar
Hallimond, A. F., 1926. “On the chemical classification of the mica group. II. The basic micas,” Min. Mag., XXI, 25–33.Google Scholar
Holmes, A., 1936. “Transfusion of quartz xenoliths in alkali basic and ultrabasic lavas, south-west Uganda,” Min. Mag., XXIV, 408–421.Google Scholar
Holmes, A., 1937. “The petrology of katungite,” Geol. Mag., LXXIV, 200–219.CrossRefGoogle Scholar
Holmes, A., 1942 a. “A suite of volcanic rocks from south-west Uganda containing kalsilite (a polymorph of KAlSiO4),” Min. Mag., XXVI, 197–217.Google Scholar
Holmes, A., 1942 b. “A heteromorph of venanzite containing kalsilite (KAlSiO4),” Geol. Mag., LXXIX, 225–232.CrossRefGoogle Scholar
Holmes, A., 1945. “Leucitized granite xenoliths from the potash-rich lavas of Bunyaruguru, south-west Uganda” (In the Press), Amer. Journ. Sci., CCXLIII, A.Google Scholar
Holmes, A., and Haewood, H. F., 1932. “Petrology of the volcanic fields east and south-east of Ruwenzori, Uganda,” Quart. Journ. Geol. Soc, LXXXVIII, 370–442.CrossRefGoogle Scholar
Holmes, A., and Haewood, H. F., 1937. “The volcanic area of Bufumbira. The petrology of the volcanic area of Bufumbira,” Geol. Surv. Uganda, Mem. III, Part II, 300.Google Scholar
King, B. C., 1939. “Appendix to petrology of some Uganda granites,” Geol. Surv. Uganda, Bull. III, 136–139.Google Scholar
Larsen, E. S., and Buie, B. F., 1938. “Potash analcime and pseudoleucite from the Highwood Mountains of Montana,” Amer. Min., XXIII, 837–849.Google Scholar
Larsen, E. S., and Gobanson, E. A., 1932. “The deuterio and later alterations of the uncompahgrite of Iron Hill, Colorado,” Amer. Min., XVII, 343–356.Google Scholar
Larsen, E. S., and Schallee, W. T., 1914. “Cebollite, a new mineral,” Journ. Wash. Acad. Sci., IV, 480–482.Google Scholar
Simmons, W. C., 1939. “Petrology of some Uganda granites,” Geol. Surv. Uganda, Bull. III, 114–135.Google Scholar
Washington, H. S., 1906. “The Roman comagmatic region,” Carnegie Inst. of Washington, Pubn. LVII, 139.Google Scholar