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Zoisite-amphibolite with corundum from Tanganyika

Published online by Cambridge University Press:  14 March 2018

P. M. Game
P. M. Game*
Affiliation:
Department of Mineralogy, British Museum (Natural History)
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Extract

The most striking rock now described occurs in the Northern Province of Tanganyika Territory, just west of the Great North road, and south of the track from Longido to Engare Naibor. A small group of specimens was collected by Mr. A. G. Clough of Industrial Minerals Ltd., and presented to the British Musemn (Natural History) in 1952 (B.M. 1952,133). The outcrops occur in the highly metamorphosed Basement Complex which forms small hills (The Matabatu Mountains) descending, at their margin, by step-faulting to a peneplaned surface cut out of much younger, unconformable volcanics; the faulting in the marginal area of the basement rocks forms the eastern side of the Rift Valley. The basement rock adjacent to the zoisite-amphibolite is usually anamphibolite with conspicuous large, brown-red garnets. The occurrence of this garnet-amphibolite is usually an indication of the proximity of the zoisite-amphibolite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 226 , September 1954 , pp. 458 - 466
Copyright
Copyright © 1954, The Mineralogical Society

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References

page 459 note 1 A.N. Winchell, Elements of optical mineralogy, 4th edit., 1951. pt. II, fig. 324, p. 433. [M.A. 11-463.]

page 460 note 1 Tertsch, H., Zur Hochtemperaturoptik basischer Plagioklase. Tschermaks Min. Petr. Mitt., 1942. vol. 54, pp. 193-217Google Scholar. [M.A. 9-270.]

page 460 note 2 Reynolds, D.L.,The difference in optics between volcanic and plutonic plagioclases … Geol. Mag., 1952. vol. 89, pp. 233-250.Google Scholar [M.A. 12-137.]

page 461 note 1 Calculated from the determined value of the sp. gr. together with the unit-ceff dimensions a16-30, b 5.60, c 10.21 Å. (Waldbaucr, L. and McCann, D.C., Amer. Min. 1935, vol. 20, p. 107.)Google Scholar [M.A. 6-179.]

page 461 note 2 Termier, p., Bull. Soc. Franç. Min. 1898, vol. 21, pp. 148-170Google Scholar.