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Genesis and Structural Control of the Rinconada as an Orogenic Gold DepositNormal access

Authors: F.I. Mamani and J.M. Llerena
Event name: 1st Latin American Geosciences Student Conference (LAGSC)
Session: Latin American Geosciences Student Conference
Publication date: 08 April 2013
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 499.39Kb )
Price: € 20

Summary:
The Rinconada Orogenic Deposit is located in the occidental edge of the eastern cordillera in southern Perú, it shows a main mineralization of quartz, pyrite, arsenopyrite and gold, which has an average law of 11-100 g/T, placed in sedimentary rocks (Fm. Sandia y Fm.Ananea) that shown a methamorphism grade of Sub -Green Schist. The sedimentary sequence is affected by the early Hercinian tectonic that generated folding, refolding and alkaline and calc-alkaline sin-postectonic plutonism. This early Hercinian plutonism has relation with the first mineralization event that took place in weakness zones like the foliation planes, fractures, structure intersections, etc. leading to lenticular bodies, micro lenticular bodies, vein, stockwork and stylolites showing a style of fragile mineralization (Goldfarb et al., 2005). During the late Hercinic tectonic phase (Late Permian-Early Triassic) (Dalmayrac et al., 1988), occurred a temperature rise probably associated to Permian-Triassic intrusive bodies that lead to an increase in the gold concentration and removilization of the mineralizing solutions to most favorable zones, which is evidenced by a flux foliation and an increase of the gold laws in the hinge and valley parts of the folds. The hydrothermal alterations are not extensive and are dominated by an alkali metasomatism (Chlorite – sericite) and silicification.


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