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Geochronology, geochemistry, and isotopic composition (Sr, Nd, Pb) of Tertiary porphyry systems in Ecuador

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Defense Thèse de doctorat : Univ. Genève, 2009 - Sc. 4166 - 2009/12/11
Collection Terre et Environnement; 87
Abstract This thesis presents geochronologic, geochemical, and isotopic data on Tertiary arc magmas associated with porphyry-related ore deposits in the northern Andes of Ecuador. In detail, ages on host and porphyry intrusion emplacement (U-Pb zircon) and hydrothermal alteration/mineralization (U-Pb titanite, Re-Os molybdenite) were obtained, combined with whole-rock geochemical analysis of least altered igneous rock samples. These data are discussed in a regional frame with respect to the geodynamic context. The following main conclusions apply: (1) porphyry-related ore deposits in Ecuador are mainly Miocene in age, and represent the northern extension of the Miocene metallogenic belt of northern-central Peru; (2) intrusions associated with mineralization are compositionally highly variable; a systematic association of mineralization with a specific trace element signature cannot be observed; (3) flat slab settings produce favorable exposure conditions for porphyry-related ore deposits; a systematic association of ore deposit formation and seamount chain (Carnegie Ridge) subduction is not observed.
Keywords EcuadorOre depositsTertiaryPorphyry systemsU-Pb geochronologyRe-Os geochronologyMagma compositionAdakiteGeodynamic evolution
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URN: urn:nbn:ch:unige-63675
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Thesis (7.1 MB) - public document Free access
Structures
Research groups Isotope Geochemistry, Geochronology and Thermochronology
Mineral Resources and Geofluids
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SCHUTTE, Philip. Geochronology, geochemistry, and isotopic composition (Sr, Nd, Pb) of Tertiary porphyry systems in Ecuador. Université de Genève. Thèse, 2009. https://archive-ouverte.unige.ch/unige:6367

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Deposited on : 2010-04-27

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