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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 116614
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 01.04.2007 - 31.03.2009
Approved amount 410'404.00
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All Disciplines (2)

Discipline
Geochemistry
Other disciplines of Earth Sciences

Keywords (5)

ore deposits; metallogeny; geochemistry; geochronology; regional geology Andes

Lay Summary (English)

Lead
Lay summary
The project is structured in the following two parts:

Sub-project A focuses on epithermal Cordilleran polymetallic mineralization taking the example of the Morococha District and other deposits of the Miocene polymetallic belt, central Peru. Main objective is to situate epithermal Cordilleran deposits in the frame of the evolution of porphyry-related mineralization systems. In this frame, it appears that the following different mineralization types are not simultaneous but represent subsequent stages which may be separated by up to several hundreds of thousands of years: i) early barren quartz alunite ledges ("barren lithocap"), ii) porphyry-copper related potassic alteration with A and B veins and/or skarn, iii) "D" veins and disseminated high-sulfidation precious metals epithermal, iv) Cordilleran vein and replacement base metal deposits. Extensive pyrite-(pyrrothite)-quartz mineralization constitutes a first stage of numerous Cordilleran deposits and may be coetaneous to the "D" veins. The project also examines the working hypothesis that epithermal Cordilleran base metal deposits are formed essentially by diluted magmatic brines.

Sub-project B tests the "orogenic" identity of a belt of gold deposits between Pataz and in the Eastern Andean Cordillera in Peru, belt which also contains features that can be attributed to intrusion-related gold deposits. The project mainly involves structural investigations, petrographic studies, fluid inclusion microthermometry, Raman spectroscopy, and radiometric dating, including 40Ar/39Ar and U-Pb.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
125258 Fluids and ore forming processes in the continental crust (cont) 01.04.2009 Project funding
108026 Fluids and Ore-forming processes in the continental Crust 01.04.2005 Project funding
125258 Fluids and ore forming processes in the continental crust (cont) 01.04.2009 Project funding
133781 Near-infrared equipment for high-precision microthermometry measurements using the infrared microscopy technique 01.12.2010 R'EQUIP

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