Abstract
The Map of Geophysical Anomalies of Colombia for mineral resources, MAGC 2020 version compiles the geophysical information acquired, processed and interpreted by the Servicio Geológico Colombiano (SGC) since 2013. This information was collected via airborne platforms (aircrafts) using magnetometry and gamma spectrometry. This version covers approximately 547 960 km2 of the national territory in the Andean (North and Central), Eastern (Eastern Plains and Amazon) and Caribbean zones (Perijá mountain range). This information consists of 17 blocks of geoscientific interest, covered by flight lines separated by 500 and 1000m, for a total of more than 907 566 linear km of airborne information, acquired at a nominal altitude of 100 m above the ground, with a sampling resolution that was not previously available at this scale and coverage. This document presents the methodology for compiling, processing and representing the thematic coverage included in MAGC 2020: Map of Total field magnetic anomaly (TFMA), Map of the analytic signal (AS) and radiometric ternary map of the distribution of the relative concentrations of uranium, thorium and potassium. Furthermore, the work identifies 1079 magnetometric anomalies of interest, which were subsequently analyzed and modeled in the Map of magnetic sources modeled from magnetization vector inversion, which contains a total of 1297 magnetic bodies interpreted from these anomalies. Integration of available geological and metallogenic information with each of these bodies allow the suggestion of possible geological sources and possible exploration targets. The objectives of this study were to generate and integrate geophysical information to identify new areas of interest with regards to potential mineral resources, and to generate new geoscientific knowledge about Colombia for land-use planning.
Highlights
Since 2012, the Servicio Geológico Colombiano (SGC) has been advancing the acquisition of geophysical information using magnetometry and gamma spectrometry, with a regional coverage and spatial resolution that were previously not available for Colombia (Moyano et al, 2016)
This document presents the methodology for compiling, processing and representing the thematic coverage included in MAGC 2020: Map of Total field magnetic anomaly (TFMA), Map of the analytic signal (AS) and radiometric ternary map of the distribution of the relative concentrations of uranium, thorium and potassium
The information acquired by the SGC and represented in the Map of Geophysical Anomalies of Colombia for mineral resources – MAGC 2020 (Moyano et al, 2020) reflects acquisition parameters at a much more detailed scale, allowing us to identify and characterize new deposits of minerals and to complement geological mapping
Summary
Since 2012, the Servicio Geológico Colombiano (SGC) has been advancing the acquisition of geophysical information using magnetometry and gamma spectrometry, with a regional coverage and spatial resolution that were previously not available for Colombia (Moyano et al, 2016). In some areas with special topographic or safety characteristics, the aircraft had to be flown at higher altitudes than the nominal flight value This higher altitude resulted in progressive deterioration and a loss of sensitivity of the gamma spectrometry equipment, which is reflected as noise in the generated data and can lead to erroneous interpretations. Data acquired at an unusual height above the nominal 100 meters showed discordant or even negative values of one or all the radioelements, and can be recognized as along-flight line strips of very high or low counts These noise measurements were represented independently on the ternary gamma spectrometry map, with a warning regarding the interpretation of these areas. The airborne magnetometry and gamma ray spectrometry information was compiled, integrated, and processed to generate thematic layers (images) with a spatial resolution of 125 m in the Caribbean and Andean zones and 250 m in the Eastern zone (Amazonas and Orinoquía)
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