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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 9 (1974), S. 261-269 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Michiquillay is a mineralized intrusive quartz monzonite porphyry displaying typical porphyry copper alteration zones as found in metallized intrusives of that composition. From the interior outward these are the phyllic, argillic and propylitic zones. The potassic zone is not exposed at the surface. The intrusion and the center of mineralization coincide with the intersection of a major transverse fault and a cross fault. Mineralization appears dominantly to occur in fractures which may be related to each of these major structures, and is ascribed in origin to simultaneous movement on each fault during the period of hydrothermal activity. The stockwork developed at the fault intersection, and which is the locus of the ore body, fades as distance is gained away from its center. Coincidentally, intensity of mineralization also weakens.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 8 (1973), S. 321-331 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé L'activité ignée, la zonalité de l'altération hydrothermale et la minéralisation du type Porphyry Copper à Chaucha sont controllées d'une façon évidente par l'intersection de deux failles importantes: la «faille de Chaucha» et la «faille Cordillera». Le developpement des fractures et de la foliation dans les roches intrusives ainsi que dans les roches intrudées obéissent au même control tectonique. Le jeu des failles affecte la diorite et la granodiorite mais pas la minéralisation ni l'intrusion de monzonite quartzifère. La texture et la nature des roches aussi bien que l'environnement géologique suggérent une origine volcanique pour ce gisement. Se basant sur les relations tectoniques et d'autres arguments géologiques, l'origine du gisement (roches et minéralisation) est interpretée, d'une façon préliminaire, à la lumiere de la tectonique des plaques.
    Notes: Abstract The intrusives and associated volcanic activity, the hydrothermal alteration pattern, and mineralization of the Chaucha porphyry copper deposit appear to be strongly controlled by the intersection of two major structures: the Chaucha fault and the Cordillera fault. Stockwork development and dynamic foliation of the intrusives and surrounding rocks respond to the same control. The fault movements affect the diorite and granodiorite intrusions and largely predate the mineralization and the quartz monzonite intrusion. The lithologies and peculiar geological setting favor a volcanic origin of the Chaucha porphyry copper. Using structural relations and other geological criteria, the Chaucha porphyry copper is tentatively placed in the plate tectonic model.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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