Record details

    Seismically active fracture zones and distribution of large accumulations of metal in the central part of Andean South America
Statement of responsibility
    Václav Hanuš, Jiří Vaněk, Aleš Špičák
    Hanuš, Václav
    Špičák, Aleš
    Vaněk, Jiří
Source title - serial
    Mineralium Deposita
    Vol. 35, no. 1
    p. 2-20
    11 obr., 2 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Mineralium Depos. (Berlin).
Subject group
    kontrola strukturní
    ložisko epitermální
    ložisko porfyrového typu
    provincie metalogenetická
    rudy Ag
    rudy Au
    rudy barevných kovů
    zlom aktivní
    zóna Benioffova
    zóna zlomová
Geographical name
Abstract (in english)
   The analysis of the geometry of distribution of earthquake foci in the central part of Andean South America between 18° and 34°S made the delineation of several seismically active fracture zones in the continental wedge overlying the subduction Nazca plate possible. Correlation of their position with the distribution of hypogene accumulations of metal revealed that the majority of large mineral deposits and mining districts are situated in the outcrops of these fracture zones. We present geometrical documentation (map of epicentres, vertical and longitudal cross sections) of the most important fracture zones and data on mineralogical composition, genetic type and available radiometric ages of mineral deposits. Sixteen mining districts in Chile, and 24 in Argentina, were attributed to the seismically active fracture zones.
   Major mining districts and individual large mineral deposits occur in six seismically active fractures zones roughly parallel to the axis of the Peru-Chile trench (Carachas-Portillo, Choquelimpie, Iquique, Domeyko, Río Blanco-Los Bayos and Farellones F.Z.), in six fracture zones roughly perpendicular to the trench (El Salvador, Maricunga, Jaroma, Ujina, Tumbaya and Incahuasi-León Muerto F.Z.) and in two fracture zones oriented at an angle of about 45° in relation to the direction of the presently active Andean subduction (Aconcagua and Sierra del Volcan F.Z.). The occurrences of large mineral deposits of different ages show that these fracture zones were also ative in the geological past and represent sites of permanent reopening of path allowing ore-bearing solutions and long-term accumulation of large amounts of metals to occur in relatively restricted domains of the Earth's crust.
   The mining districts with dated mineral deposits are arranged into four periods of hypogene mineralization: Upper Miocene-Pliocene, Upper Oligocene-Middle Miocene, Upper Eocene-Middle Oligocene, Lower Paleocene-Upper Eocene. These periods of metallogenic activity correlate well with four supposed Andean subduction
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    31. 8. 2007
Import date
    8. 8. 2012