Size mattersUnderstanding why some Andean ore deposits are so huge

  1. R. Oyarzun 1
  2. J. Lillo 2
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Universidad Rey Juan Carlos
    info

    Universidad Rey Juan Carlos

    Madrid, España

    ROR https://ror.org/01v5cv687

Zeitschrift:
Geotemas (Madrid)

ISSN: 1576-5172

Datum der Publikation: 2012

Titel der Ausgabe: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Nummer: 13

Seiten: 1919-1921

Art: Artikel

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Andere Publikationen in: Geotemas (Madrid)

Zusammenfassung

Key to formation of an ore deposit is the volatile species that will leach and transport the metal(s). For porphyry copper deposits the volatile species is SO2 and for iron it is Cl. We here examine two metallogenic (Fe and Cu) provinces in the Chilean Andes, both containing huge and small deposits. We argue that if the volatile species are initially retained by the magma, for example during high rates of crustal stress, then the probability of formation of a large ore deposit is high. Thus, in the Cretaceous Iron Belt, a decisive factor for formation of large ore deposits was the development of transpressional conditions along the southern segment of the belt. For the Late Eocene-Early Oligocene Porphyry Copper Belt, the increase of stress (i.g large ore deposits formation) was related to shallow subduction.

Fuente de los datos: Dialnet