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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 134872
Funding scheme Project funding
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geochemistry
Start/End 01.04.2011 - 31.03.2013
Approved amount 416'060.00
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Keywords (4)

Ore; deposits; geochemistry; metallogeny

Lay Summary (English)

Lead
Lay summary

Sub-project A will focus on the evolution of ore forming fluids of Cordilleran polymetallic mineralization which are part of porphyry-related systems. It is proposed to revisit the deposits of Colquijirca and Cerro de Pasco, where, in previous project periods, detailed descriptions had been produced. The aim is to characterize fluids from well selected fluid inclusion using a combination of analytical methods: microthermometry, LA-ICP-MS, O and H isotope determination, noble gas determination, Cl isotopes, Raman spectroscopy. The main goal is to better estimate the proportions of meteoric fluids that have been mixed to fluids of basically magmatic origin and so identify the composition of the original fluids that form the Cordilleran polymetallic deposits (single-phase fluids versus contracted vapor phases or versus diluted brines).

: last 5 months of a Ph.D. thesis on gold deposits within the Eastern Andean Cordillera in Peru.Sub-project B

. new Ph. D. Thesis on stratabound sandstone-hosted deposits in the Swedish Caledonides. The study will deal the spatial controls, age and origin of stratabound sandstone-hosted and vein Pb-Zn deposits in the Swedish Caledonides. Although considerable high-quality data have been acquired since the 1980s, they have not been exploited under a global perspective and inconsistencies persist between the different genetic models. The rationale behind this sub-project is to a large extent to scientifically exploit the wealth of new field and drilling data gathered in the last years during exploration and mining activities.  These data will mainly used to construct 3D representations of selected deposits to give insight into the paleo-hydrology during mineralization and so constrain the different models. The hypothesis that economic ore precipitated in places where reduced sulfur was trapped together with hydrocarbons will be examined together with the other proposed models. Sub-project C

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Copper-excess stannoidite and tennantite-tetrahedrite as proxies for hydrothermal fluid evolution in a zoned Cordilleran base metal district, Morococha, central Peru
Catchpole H. Kouzmanov K. Fontboté L. (2012), Copper-excess stannoidite and tennantite-tetrahedrite as proxies for hydrothermal fluid evolution in a zoned Cordilleran base metal district, Morococha, central Peru, in The Canadian Mineralogist, 50, 719--743.
Fluid evolution in zoned Cordilleran polymetallic veins — Insights from microthermometry and LA-ICP-MS of fluid inclusions
Catchpole Honza, Kouzmanov Kalin, Fontbote Lluis, Guillong Marcel, Heinrich Christoph A. (2012), Fluid evolution in zoned Cordilleran polymetallic veins — Insights from microthermometry and LA-ICP-MS of fluid inclusions, in Chemical Geology, 281(3-4), 293-304.
Porphyry-related polymetallic mineralisation in the Morococha district, central Peru: mineralisation styles, timing and fluid evolution
Catchpole Honza (2011), Porphyry-related polymetallic mineralisation in the Morococha district, central Peru: mineralisation styles, timing and fluid evolution, Section des Sciences de la Terre et de l'enviroonement, University of Geneva, Geneva.

Collaboration

Group / person Country
Types of collaboration
Dr. Michael Stephens/Geological Survey Sweden Sweden (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Urs Schaltegger, Dr. Massimo Chiaradia, Dr. Richard Spikings/UNIGE Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Torsten Venemann/UNIL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Ch. Heinrich/ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Associated projects

Number Title Start Funding scheme
138130 Episodic Mesozoic to Tertiary ore-forming events along the Lesser Caucasus and adjoining tectonic provinces 01.11.2011 Project funding
125258 Fluids and ore forming processes in the continental crust (cont) 01.04.2009 Project funding
144974 Acquisition of QEMSCAN Automated High-Resolution Mineral and Petrographic Analysis. 01.12.2012 R'EQUIP
125258 Fluids and ore forming processes in the continental crust (cont) 01.04.2009 Project funding
146353 Fluids and ore forming processes in the continental crust (cont) 01.04.2013 Project funding
147076 Chemistry and P-T of fluids trapped in co-genetic opaque ore and transparent gangue minerals: What are the real ore-precipitating fluids? 01.04.2013 Project funding

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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