NDLI: Control estructural de la mineralización epitermal del distrito Manantial Espejo, Santa Cruz

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Control estructural de la mineralización epitermal del distrito Manantial Espejo, Santa Cruz

Content Provider	Semantic Scholar
Author	Echeveste, Horacio
Copyright Year	2010
Abstract	Structural control of the epithermal mineralization in the Manantial Espejo ore ditrict, Santa Cruz. The structural analysis of the Manantial Espejo Au-Ag district allows to identify the existence of at least two brittle extensional deformation systems that were active before 159 Ma (Callovian). Rhyolitic volcanism and epithermal activity in the region were associated with these systems. The oldest of them was due to a main σ1 NNO-SSE stress that produced two fracture systems: one at approximately 25° and the other at around 140°. These fractures hosted the rising rhyolitic magma, which generated dikes, and channeled of carbonate-rich waters associated with the presence of a hot spring type system, which formed calcite veins and travertine deposits on the surface. A second deformation system occurred after the former one and produced a simple shear system with a σ1 ~ N 35° W similar to a conjugate Riedel shear system. The shear system has extension fractures between 120° and 150° that originated normal faults with NNE an SSW slope. These faults, with combined normal and dextral movements, cut and displaced the structures from the previous period and produced dilatational jogs, echelon type joints, and sigmoidal veins that created most of the new circulation channels of the now silica-saturated hydrothermal fluids. The decompression and consequent release of the CO2 of the mineralizing solutions produced by the reactivation of the fractures did generate the typical crustiform-colloform banded structures of the principal veins of the district. This last deformation system remained active until, at least, the Late Oligocene.
Starting Page	325
Ending Page	334
Page Count	10
File Format	PDF HTM / HTML
Volume Number	66
Alternate Webpage(s)	http://www.scielo.org.ar/pdf/raga/v66n3/v66n3a04.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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