Publications des scientifiques de l'IRD

Sanchez C., Brichau Stéphanie, Riquelme R., Carretier Sébastien, Bissig T., Lopez C., Mpodozis C., Campos E., Regard V., Hérail Gérard, Marquardt C. (2018). Exhumation history and timing of supergene copper mineralisation in an arid climate : new thermochronological data from the Centinela District, Atacama, Chile. Terra Nova, 30 (1), p. 78-85. ISSN 0954-4879.

Titre du document
Exhumation history and timing of supergene copper mineralisation in an arid climate : new thermochronological data from the Centinela District, Atacama, Chile
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000423619700010
Auteurs
Sanchez C., Brichau Stéphanie, Riquelme R., Carretier Sébastien, Bissig T., Lopez C., Mpodozis C., Campos E., Regard V., Hérail Gérard, Marquardt C.
Source
Terra Nova, 2018, 30 (1), p. 78-85 ISSN 0954-4879
Supergene copper mineralisation (SCM) processes occur during the unroofing of porphyry copper deposits. However, the geomorphological stage during which the main mineralisation occurs is still under debate. Here, we present 24 new thermochronological data from Cenozoic intrusives and compare them with the evolution of supergene mineralisation from the Centinela Mining District in the Atacama Desert. Our results indicate a two-step cooling path: a rapid Late Eocene exhumation followed by a slow denudation. Previously published supergene mineralisation ages cluster after the main Upper Oligocene exhumation period. Ours is the first study that establishes the relationship between exhumation and supergene processes on the scale of a single mining district. It confirms that SCM took place during pediplanation, likely a required condition for efficient SCM under arid climatic conditions, in contrast to wet tropical environments where SCM occurs during rapid relief growth but has limited preservation potential.
Plan de classement
Hydrologie [062] ; Géologie et formations superficielles [064]
Description Géographique
CHILI ; ATACAMA DESERT
Localisation
Fonds IRD [F B010072048]
Identifiant IRD
fdi:010072048
Contact