NDLI: Caracterización petrográfica y geoquímica y condiciones de deformación del plutón San Cristóbal, Sierra de Velasco (La Rioja, Argentina)

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Caracterización petrográfica y geoquímica y condiciones de deformación del plutón San Cristóbal, Sierra de Velasco (La Rioja, Argentina)

Content Provider	Semantic Scholar
Author	Bellos, Laura Iudith Toselli, Alejandro J. Rossi, Juana N. Grosse, Pablo Díaz, Jesús Damián De La Rosa Dorado, Antonio Castro
Copyright Year	2010
Abstract	The San Cristobal pluton is a 35 km 2 granitic body that outcrops at the southestern tip of the Sierra de Velasco, located west of La Rioja city, Argentina. It is formed by monzogranites and syenogranites, together with scarce granodiorites, with medium to fine-grained, equigranular to slightly porphyritic textures. Their mineral assemblage consists of quartz + microcline + plagioclase + biotite ± muscovite + zircon + apatite + magnetite. The granite contains dioritic to tonalitic mafic enclaves. The central and eastern parts of the granite have been deformed by the NNW-SSE trending South Mylonitic shear zone formed by mylonitic rocks. The metamorphic host-rock is represented by scarce greenschist facies xenoliths and hornfels with the high T / P assemblage K-feldspar - cordierite - biotite ± sillimanite. The granites are calc-alkaline, weak- to moderately peraluminous, and formed as part of a continental magmatic arc developed along the active margin of western Gondwana during the Early Paleozoic. The depth of emplacement of the San Cristobal pluton is estimated at ~12 km.
Starting Page	157
Ending Page	169
Page Count	13
File Format	PDF HTM / HTML
DOI	10.3989/egeol.39981.076
Volume Number	66
Alternate Webpage(s)	http://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/download/789/817
Alternate Webpage(s)	http://rabida.uhu.es/dspace/bitstream/handle/10272/7644/Caracterizacion%20petrografica.pdf?sequence=2
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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