Petrografía y geoquímica de las rocas ígneas intrusivas aflorantes al sur del municipio de Cáchira: aporte al conocimiento geológico del Batolito de Rionegro (magmatismo jurásico) en el macizo de Santander

Las rocas ígneas aflorantes al sur de Cáchira (Norte de Santander) cartografiadas como Batolito de Rionegro, pertenecen a un plutón Jurásico emplazado a un nivel transicional entre la mesozona y lígneas que corresponden a: monzogranitos pobres en biotita, monzogranitos-granodioritas ricas en biotita...

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Autores:
Hernandez Gelves, Sergio Andres
Tipo de recurso:
http://purl.org/coar/version/c_b1a7d7d4d402bcce
Fecha de publicación:
2016
Institución:
Universidad Industrial de Santander
Repositorio:
Repositorio UIS
Idioma:
spa
OAI Identifier:
oai:noesis.uis.edu.co:20.500.14071/35007
Acceso en línea:
https://noesis.uis.edu.co/handle/20.500.14071/35007
https://noesis.uis.edu.co
Palabra clave:
Batolito De Rionegro
Macizo De Santander
Cáchira
Petrografía
The igneous rocks outcropping in south of Cáchira (Norte de Santander) mapped as Rionegro Batholith
belongs to a Jurassic pluton emplaced on transitional level between mesozone and epizone; it corresponds to an "S-type" granitoid (with muscovite and garnet) and has three igneous facies corresponding to: monzogranite poor in biotite
monzogranite-granodiorite rich in biotite and pegmatites with microcline megacrystals. As major minerals appears quartz
plagioclase
alkali feldspar
biotite and muscovite. These rocks are acid
strongly peraluminous (A / CNK> 1.1)
high K calc-alkaline
associated with extensional environment related to mature arc in an active continental margin
probably back arc rifting or intra-continental rift
by partial melting of metasedimentary rocks being the Bucaramanga gneiss a possible protolith. This pluton intruded the Silgará Formation rocks
creating a thin metamorphic contact aureole that reaches albite-epidote Hornfels facies. In the geochemical study was analyzed rocks at the Rionegro batholith located in the Playón --Type" and "A-Type" granitoids are common in extensive environments
which suggests that the Batholith Rionegro is a nested pluton formed by the injection of different magmatic pulses with variable compositions. 1
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Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)