Massive sulfide deposits related to submarine volcanic activity / Luis Jaramillo.
By: Jaramillo, Luis [Autor]
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Item type | Current location | Collection | Call number | Copy number | Status | Date due | Barcode |
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SGC - Bucaramanga | Hemeroteca - Separatas | SBU-00067 (Browse shelf) | 2 | Available | 076029 | |
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SGC - Medellin | Informes técnicos | I-5176 (Browse shelf) | 1 | Available | 080908 |
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Geosynclinal igneous activity -- Geological environments of massive sulfides -- Wall rock alteration -- Regional metamorphism -- Genesis of the ore minerals -- Exploration guides -- Conclusions -- References.
Massive sulfide deposits are commonly related to volcanic rocks and associated sediments that accumulated in eugeosynclines. Ore bodies may occur in both, volcanic and sedimentary rocks but probably more than 80% of the massive sulfides in the world are genetically related to volcanic rocks of the basalt-andesite-rhyolite association.
By reason of their early appearance in geosynclinal belts volcanics and related sediments have been affected by regional metamorphism; this masks some of the associated massive sulfides.
Considerable evidence support their formation from submarine hydrothermal emanations. Marine environments seems to be very important in the concentration of the metals. In subaerial eruptions the ore fluids are dispersed or lost to the atmosphere whereas in subaqueous eruptions they mix with sea water and with increasing concentration the metals precipitate and accumulate in favourable sites.
Aparetly some deposits of manganese, chert, banded silica and iron formation that usually accompany massive sulfides, were produced by similiar processes. Most of the important deposits in the world show evidence of submarine environment. Such evidence is found in mining districts of Jafan, Cyprus, United States and Canada.
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