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Extra info for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia
The deposition of the pyrite took place over a long period of time. Pyrite is found in all of the lodes and their associated wall rocks from the surface to the greatest depths reached in mining. The coarser the pyrite, the less likely gold is to be present. Arsenopyrite is present in the shales as larger crystals and in the lavas as fine aggregates; these fine aggregates usually are found in lava relicts in the quartz. Arsenopyrite also replaces granular pyrite; the arsenopyrite is thought by Collender to be pre-quartz in age.
Jg. 1971, Η. 8 , S. , V. 43, p. xxvii-xlviii Geol. Soc. S. Africa Macgregor, A. , 1 9 4 7 , An outline of the geological history of Southern Rhodesia: S. Rhodesia Geol. Surv. Bull. no. 3 8 , 73 p. Maufe, H. , and others, 1 9 1 9 , The geology of the Selukwe mineral belt: Rhodesia Geol. Surv. Bull. no. 3 , 96 p. S. McElhinny, M. W. and Gough, D. , 1 9 6 3 , The palaeomagnetism of the Great Dyke of Southern Rhodesia: Geophys. , London, v. 7 , no. 3 , p. 2 8 7 - 3 0 3 ZAIRE ΖΑΪΡΕΑΝ TIN BELT A / MANGULA^ J-SUMEB ¡ SOUTH-WEST J AFRICA \RHODESIA BOTSWANA ^-^ GREAT ^SELUKWE, J \ .
The overloading of the floor, during injection and crystallization caused a graben subsidence, and the originally horizontal layers sagged to give their present synclinal arrangement. The four places along the dike where gabbro is pre served are thought by Worst to correspond roughly with the position of the pos tulated feeders. When the emplacement of the complexes was completed, they probably extended over much wider areas than they now occupy, but much of the upper portion of each complex has been removed by erosion to reduce the width of the dike to only a small fraction of its original extent.