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Fluids and ore forming processes in the continental crust (cont)

English title Fluids and ore forming processes in the continental crust (cont)
Applicant Fontboté Lluis
Number 125258
Funding scheme Project funding (Div. I-III)
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geochemistry
Start/End 01.04.2009 - 31.03.2011
Approved amount 469'841.00
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Keywords (6)

Andes; ore deposits; geochronology; hydrothermal fluids; Metallogeny; Geochemistry

Lay Summary (English)

Lead
Lay summary
The present proposal for a two years extension is the central project of the Geneva Ore Deposits Group.Sub-project A (a post-doctoral position and partial support of two Ph.D. theses) will focus on Cordilleran polymetallic mineralization as part of porphyry-related systems at Morococha, a classical and economically important district of the Miocene polymetallic belt in central Peru. This district was selected after the completion of two Ph.D. theses on the classical deposits of Colquijirca and Cerro de Pasco in the same belt, because at Morococha epithermal portions of the system crosscut porphyry deposits. Excellent outcrop conditions, well developed zoning, and presence of partly datable subsequent hydrothermal pulses allow tackling on the following three general objectives:Goal A1 Cordilleran base metal deposits in the evolution frame of a porphyry-related mineralization system. (Continuation of precedent project) Goal A2 Quantitative constrains, by a fission-track and (U-Th)/He study, of the thermal and exhumation histories of the magmato-hydrothermal systems between ~300-40°C (zircon and apatite), and hence the timing of superposition of the porphyry and epithermal mineralization events. (New goal, largely as complement of Goal A1).Goal A3 Fluid characterization of Cordilleran ore deposits and other mineralization styles in a porphyry-related system. (Continuation of precedent project).Sub-project B (continuation of a Ph.D) investigates several gold deposits within the Eastern Andean Cordillera in Peru. The aim is to test the "orogenic" identity of gold deposits in the Pataz-Marañón Valley gold belt, which also contain features that can be attributed to intrusion-related gold deposits. This project will be based on a multidisciplinary approach, but will mainly involve structural investigations, careful petrographic studies, fluid inclusion microthermometry, Raman spectroscopy, and radiometric dating, including 40Ar/39Ar and U-Pb. The study will be carried out at three different scales: (1) on local mining districts (Pataz, Parcoy and Huachón,
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
134872 Fluids and ore forming processes in the continental crust (cont) 01.04.2011 Project funding (Div. I-III)
116614 Fluids and Ore-forming processes in the continental Crust (cont) 01.04.2007 Project funding (Div. I-III)
116614 Fluids and Ore-forming processes in the continental Crust (cont) 01.04.2007 Project funding (Div. I-III)
134872 Fluids and ore forming processes in the continental crust (cont) 01.04.2011 Project funding (Div. I-III)
133781 Near-infrared equipment for high-precision microthermometry measurements using the infrared microscopy technique 01.12.2010 R'EQUIP
127123 Chemistry and P-T of fluids trapped in co-genetic opaque ore and transparent gangue minerals: What are the real ore-precipitating fluids? 01.01.2010 Project funding (Div. I-III)

Abstract

The present proposal for a two years extension is the central project of the Geneva Ore Deposits Group. It constitutes the continuation of the Swiss National Science Foundation project 200020-116614 “Fluids and ore-forming processes in the continental crust”, running until March 31st, 2009. During this period it is anticipated that the subproject A, dealing with the Cordilleran polymetallic mineralization as part of porphyry-related systems at Morococha will be finished, leaving place to a new research topic in a subsequent project.Sub-project A (a post-doctoral position and partial support of two Ph.D. theses, supervision Prof. L. Fontboté and Dr. K. Kouzmanov) will focus on Cordilleran polymetallic mineralization as part of porphyry-related systems at Morococha, a classical and economically important district of the Miocene polymetallic belt in central Peru. This district was selected after the completion of two Ph. D. theses on the classical deposits of Colquijirca and Cerro de Pasco in the same belt, because at Morococha epithermal portions of the system crosscut porphyry deposits. Excellent outcrop conditions, well developed zoning, and presence of partly datable subsequent hydrothermal pulses allow tackling on the following three general objectives: Goal A1 Cordilleran base metal deposits in the evolution frame of a porphyry-related mineralization system. (Continuation of precedent project)Goal A2 Quantitative constrains, by a fission-track and (U-Th)/He study, of the thermal and exhumation histories of the magmato-hydrothermal systems between ~300-40°C (zircon and apatite), and hence the timing of superposition of the porphyry and epithermal mineralization events. (New goal, largely as complement of Goal A1).Goal A3 Fluid characterization of Cordilleran ore deposits and other mineralization styles in a porphyry-related system. (Continuation of precedent project).Sub-project B (continuation of a Ph.D. thesis, supervision Dr. R. Moritz) investigates several gold deposits within the Eastern Andean Cordillera in Peru. The aim is to test the "orogenic" identity of gold deposits in the Pataz-Marañón Valley gold belt, which also contain features that can be attributed to intrusion-related gold deposits. This project will be based on a multidisciplinary approach, but will mainly involve structural investigations, careful petrographic studies, fluid inclusion microthermometry, Raman spectroscopy, and radiometric dating, including 40Ar/39Ar and U-Pb. The study will be carried out at three different scales: (1) on local mining districts (Pataz, Parcoy and Huachón, <10 km length), (2) adjoining mining districts within the same batholith (Pataz and Parcoy, about 60 km length), and (3) a single 500 km-long belt within the same host rock and structural setting (from Pataz to Huachón).
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