Geology and Petrogenetic Model of Granitoids that Crop out in the Zone of Pico El Aguila – Pinango. Mérida State Mérida, Venezuela

Andreina D. Liborius P.

In the Central Venezuelan Andes, specifically in the northern region of the state of Mérida between Pico El Aguila-Piñango, there are many plutons that outcrop. Although there is previous work in the study area, none of them have produced geochemical and petrogenetic models. That is why this project is of great importance, since it encompasses a number of petrographic, geochemical, and absolute dating analyses, which has contributed to a precise petrogenetic model. A geologically integrated study consisted of field work combined with laboratory analyses that included igneous- metamorphic petrography and whole rock geochemical analyzes for igneous bodies. This allowed for establishing a relationship between the magmatic source, crystallization conditions, and other post-emplacement processes. After applying this methodology, it was concluded from the petrographic studies that the granitoids in Mifafí Valley are classified as monzogranite- syenogranite. The Eagle Peak Road granitoids called El atardecer I and II are classified as monzogranite-granodiorite. Cañada Cerrada granites are classified as syenogranite and the Piñango granite is a monzogranite. Using geochemical analyses, it was concluded that the samples are classified as S-type granitoids and plotted in the fields of non-orogenic granitoids, volcanic arc (for the studied Mifafí Valley granitoids) and collisional granitoids influence of volcanic arc (for granitoids belonging to Cañada Cerrada and Piñango) as peraluminous granitoids.

Keywords: Central Andean granitoids, petrography, geochemistry, petrogenesis, Mérida.

AAPG Search and Discovery Article #90182©2013 AAPG/SEG Student Expo, Houston, Texas, September 16-17, 2013