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