By John Drew Ridge
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Additional info for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia
The bornite, from its close association with chalcocite, probably was deposited in the leptothermal range. The chalcopyrite, which is found in the outer portions of the ore body may, as a ubiquitous min eral, have been formed under leptothermal or mesothermal conditions and under a combination of both. On the other hand, the hydrothermal magnetite (and its alteration products) and the microcline indicate high intensity conditions. This situation would not be hard to resolve were it not for Jacobsen's belief that the magnetite and the metallic sulfides were formed at much the same time.
He adds, however, that he believes that these mag matic currents probably caused minor repetitions in the Great Dyke (and the Bushveld) but that, in the Great Dyke at least, the major layering probably was formed by recurring magmatic injection. Certainly the accepted explana tion for the Bushveld layering (and for that of other similar complexes) was that it was produced by differential magmatic currents, but Bichan believes that this requires that the currents change in velocity so frequently and so conveniently that the variations, particularly of MgO content to that of FeO, are better explained by a new influx of MgO-rich liquid.
2, p. 29-40 Macgregor, A. , 1 9 3 9 , The geology of the country around Gatooma and Battle fields: S. Rhodesia Geol. Surv. Bull. no. 17, 144 p. Wiles, J. , 1 9 5 7 , The geology of the eastern portion of the Hartley gold belt. 34 ANNOTATED BIBLIOGRAPHIES OF MINERAL DEPOSITS part I; Gold deposits and mines, part II: no. 44^ pt. ; pt. 2, 180 p. S. Rhodesia Geol. Surv. Bull, Willemse, J . , 1 9 3 5 , On the ore minerals of the Murchison Range, Cam and Motor mine (Gatooma) and the Globe and Phoenix mine (Que Que): Geol.
Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia by John Drew Ridge