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 Volume 1 Chapter 2

Chapter 2


Contribution of New Airborne Geophysical Information to the Geological Knowledge of Eastern Colombia

Ismael Enrique MOYANO–NIETO, Renato CORDANI, Lorena Paola CARDENAS–ESPINOSA, Norma Marcela LARA–MARTÍNEZ, Oscar Eduardo ROJAS–SARMIENTO, Manuel Fernando PUENTES–TORRES, Diana Lorena OSPINA–MONTES, Andrés Felipe SALAMANCA–SAAVEDRA and Gloria PRIETO–RINCÓN

https://doi.org/10.32685/pub.esp.35.2019.02


Citation is suggested as: 

Moyano–Nieto, I.E., Cordani, R., Cardenas–Espinosa, L.P., Lara–Martínez, N.M., Rojas–Sarmiento, O.E., Puentes–Torres, M.F., Ospina–Montes, D.L., Salamanca–Saavedra, A.F. & Prieto–Rincón, G. 2019. Contribution of new airborne geophysical information to the geological knowledge of eastern Colombia. In: Gómez, J. & Mateus–Zabala, D. (editors), The Geology of Colombia, Volume 1 Proterozoic – Paleozoic. Servicio Geológico Colombiano, Publicaciones Geológicas Especiales 35, p. 35–44. Bogotá. https://doi.org/10.32685/pub.esp.35.2019.02


Abstract 


Airborne geophysics is an easy way to increase and complement the geological knowledge of large areas, especially very remote areas like the Colombian Amazonia. For this objective and to identify areas of interest for mineral resources, the Colombian government has made extensive efforts to fly the Andean and eastern parts of the country, collecting more than 400 000 linear km of magnetic and gamma spectrometric information over the Colombian Amazonia. This document focuses on describing the potential of these data to increase the geological knowledge of the Amazonian region. It presents a methodology for interpretation of geophysical data and its application over a specific area in the eastern Guainía Department, where the Paleoproterozoic to Mesoproterozoic igneous and metamorphic rocks of the Guiana Shield (Mitú Complex, Parguaza Granite) and several lineaments and structural trends that have not been previously reported were identified. These crystalline basement rocks are partially covered by Miocene sedimentary rocks, recent alluvial deposits and dense rainforest coverage, which make geological mapping very difficult. The results increase the relevance of this type of geophysical interpretation to the geoscientific knowledge about Colombia. This paper also highlights the training of Colombian geoscientists in modern geophysical interpretation techniques.


Keywords:   geophysical interpretation, magnetics, gamma spectrometry, Colombian Amazonia.