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

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

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

Publicaciones similares