Download e-book for kindle: Annotated Bibliographies of Mineral Deposits in Africa, Asia by John Drew Ridge

By John Drew Ridge

ISBN-10: 0080204597

ISBN-13: 9780080204598

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Extra resources for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia

Sample text

Two much smaller dikes are located west and east of much (west) or some (east) of the Great Dyke itself. The westerly dike is known as the Umvimeela Dyke and the easterly one as the East Dyke. The Umvimeela outcrops for most of the length of the Great Dyke, and the large Faults that displace the Great Dyke also displace the Umvimeela, but the Umvimeela is not found in the area of the Musengezi complex. The East Dyke has three outcrop areas, with lengths of 40, 20, and 8 miles, respectively, and both dikes become increasingly far from the main one as they are followed south.

S. Africa Spec. Pub. no. 1: p. 391-424 James, D. , 1 9 5 7 , Geochemical prospecting studies in the Great Dyke chromite district. Southern Rhodesia: Imp. Coll. Sei. , London, Geochem. Prosp. Res. Centre, Tech. , no. 13, 44 p. Keep, F. , 1 9 3 0 , Origin of chromite deposits: p. ) Econ. , v. 25, 1 9 3 0 , The geology of the chromite and asbestos deposits of the Umvukwe Range, Lomagundi and Mazoe districts: S. Rhodesia Geol. Surv. Bull. no. 16, 105 p. 1 9 3 3 , Magmatic chromite deposits in southern Africa: V.

These two dikes probably were produced in the last phase of the igneous activity that produced the Great Dyke. They are filled with quartz gabbro that is essen­ tially the same as that of the quartz gabbro of the Great Dyke nor do they ex­ tend farther north or south than the extremities of the Great Dyke. Further, the feldspars are clouded in both types of quartz gabbro and the pyroxenes in both are amphibolitized. These dikes, of course, contain no chromite. In addition to these two dikes, four small satellitic masses are located south of the southern end of the Great Dyke; they contain essentially no chromite and are of no economic interest.

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Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia by John Drew Ridge

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