Citas bibligráficas
Contreras, M., (2014). Definición del contexto estratigráfico, magmático y estructural del Yacimiento Pampa de Pongo para construir el modelo geológico y tectónico Bella Unión - Caravelí - Arequipa [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/1159
Contreras, M., Definición del contexto estratigráfico, magmático y estructural del Yacimiento Pampa de Pongo para construir el modelo geológico y tectónico Bella Unión - Caravelí - Arequipa [Tesis]. : Universidad Nacional de Ingeniería; 2014. http://hdl.handle.net/20.500.14076/1159
@misc{renati/255358,
title = "Definición del contexto estratigráfico, magmático y estructural del Yacimiento Pampa de Pongo para construir el modelo geológico y tectónico Bella Unión - Caravelí - Arequipa",
author = "Contreras Fajardo, Marco Antonio",
publisher = "Universidad Nacional de Ingeniería",
year = "2014"
}
The Pampa de Pongo deposit is one of the largest deposits of iron in the world, with over 3GT @ 40% Fe and Cu values. Because of the importance of this deposit, the detailed geological studies are necessary to proper understanding and identification of new exploration targets. Therefore the aim of this thesis is to define the stratigraphic, magmatic and structural setting of the Pampa de Pongo deposit to build a model of geological and tectonic evolution. Based on the geological map of the study area, and data from 247 diamond drilling drilled in the project, have been done more than 12 stratigraphic columns, have been collected fossil samples, and samples were taken for petrographic and geochemical studies. The structural analysis was performed using the method of sections 15 cross sections for this ore body and the composed longitudinal section, projecting 97 drilling in the sections. The stratigraphic studies and subvolcanic and plutonic rocks emplacement have defined 13 lithological units: the Mesoproterozoic Basal Complex Coast, the Neoproterozoic Chiquerío Formation, the Marcona Formation of possible Lower Paleozoic age(?), the Middle Jurassic Río Grande Formation, the Upper Jurassic Jahuay Formation, the Lower Cretaceous Yauca Formation, the Miocene Pisco Formation and quaternary deposits. The subvolcanic intrusives are shaped by the Tunga andesites and the Lower Cretaceous microdioritic sills that intrude the pre- Cenozoic units. The plutonic intrusives are part of the Coastal Batholith of Lower to upper Cretaceous, are composed of diorite, quartz diorite and tonalite-granodiorite. Five predominantly extensional tectonic events have been identified. Initial events generated three fault systems, which modeled the initial structural configuration of the study area, subsequent events have reactivated fault systems, generating the current structural configuration. The first system is composed by siniestral transcurrent faults with normal component, these has been formed in early Middle Jurassic, some pre Jurassic faults were reactivated during this period. Later in the Middle Miocene were reactivated. The second system is composed by normal faults which origin is linked to the first fault system. The third system is composed by dextral transcurrent faults with normal component which have been generated in the late Lower Cretaceous, before mineralization at Pampa de Pongo; subsequently they were reactivated in the Eocene. The Marcona Formation is the main metallotect in Pampa de Pongo. In the mineralized zone dolomias are partially replaced by magnetite, serpentine, dolomite and iron sulphides, mainly. These are after the third fault system (before they reactivated), the emplacement of the subvolcanic intrusives and the three types of Coastal Batholith plutonic rocks. The mineralization was possibly originated from an unidentified posterior magmatic pulse, which could be a monzonite(?).
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