Igneous Rocks from the Abercorn and Kasama Districts, Northern Rhodesia

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Abstract
This paper presents a brief outline of the geology of the area shown in the map, Text-fig. 1, and a petrographic account of a small collection (eighty specimens) of its igneous rocks. The area is centred about 60 miles south-south-east of the southern end of Lake Tanganyika, and midway between Abercorn and Kasama. It lies at the headwaters of the Chambesi River, the source, or one source, of the Congo, on the high plateau of Northern Rhodesia at an altitude of 4,000 to over 5,500 feet. There is as yet no literature dealing with the petrology of North-Eastern Rhodesia, and the Rhodesian Copper Belt is too far distant (over 300 miles) to allow of any useful comparisons at this stage. It is interesting, however, to compare the rocks of this area with those of the Lupa Goldfield (1) in Tanganyika Territory, some 120 miles to the north-north-east.

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