Los granitos Río Rodeo y Quimivil: dos etapas del magmatismo paleozoico del norte de Sierras Pampeanas.
[EN] Three types of granitoids crop out in the north of Sierra de Zapata, south of Cordón de los Colorados and south-west of Sierra de Belén, Catamarca province, north-western Sierras Pampeanas. The Belén Granite is a Lower Palaeozoic coarse-grained biotitic granite with both deformed and undeformed...
| Authors: | , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 1999 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/216831 |
| Online Access: | http://hdl.handle.net/10261/216831 |
| Access Level: | Open access |
| Keyword: | granite magmatism fractional crystallisation Sn-W mineralization Pampean Ranges granito magmatismo Cristalización fraccionada mineralización de Sn-W Sierras Pampeanas |
| Summary: | [EN] Three types of granitoids crop out in the north of Sierra de Zapata, south of Cordón de los Colorados and south-west of Sierra de Belén, Catamarca province, north-western Sierras Pampeanas. The Belén Granite is a Lower Palaeozoic coarse-grained biotitic granite with both deformed and undeformed facies. The Río Rodeo Granite is a medium to coarse-grained peraluminous two-mica granite that had a possible anatectic origin by partial melting and fractional crystallization of the Belén Granite. The third pluton, the Quimivil Granite, has four major facies of mainly biotitic syeno- and monzogranites, of peraluminous geochemistry and with a peralkaline trend. A volatile phase played an important role in influencing and delaying the crystallisation of alkali-rich feldspars. There is Rb, U, Th, and REE enrichment, and the Quimivil Granite was responsible for Sn- and W-bearing mineralization. The Río Rodeo Granite has syn- to late-collision features and the Quimivil Granite has post-collision features; both emplaced under 3 kbar and 700 °C. Ordovician-Silurian and Carboniferous ages are inferred for the respective bodies. |
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