Observations on mineralogical and ore-genetic problems at Mangula

Autor: W. B. G. Jacobsen
Rok vydání: 1964
Předmět:
Zdroj: Geologische Rundschau. 53:870-895
ISSN: 1437-3262
0016-7835
Popis: Following the author's previous paper on the broad outline of the Geology of the Mangula Copper Deposits (Jacobsen, in print), a few of the more complex problems of mineralisation are discussed. Introduction of iron, manifested by widespread, often structurally controlled martitisation, is shown to be likely. Origin of copper and iron bearing veins by lateral secretion is rejected. General silicification, potassium and boron metasomatism and intense chloritisation at Norah Mine in particular are interpreted as further proof of hydrothermal activity emanating from intruding granites. Close relationship of the mineralogical phenomena to those described recently byDarnley (1960) andVaes (1960) from Northern Rhodesia and Katanga leads to a discussion of genetic theories on the Northern Rhodesia copper deposits. Their classifications into one regional metallo-genetic epoch and province during the late algonkian Katanga-Lomagundi orogeny is proposed. Hydrothermal origin in the wake of syn-or postkinematic granite intrusions under hypothermal or even granitising conditions is accepted for all deposits within the Katanga-Lomagundi geosyncline.
Databáze: OpenAIRE
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