Boletín de Geología

Vol. 46 No. 1 (2024): Boletín de Geología
Artículos científicos

Model of the inner structure of Puracé volcano and Los Coconucos Volcanic Chain, based on gravimetric and magnetic data

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  • Patricia Ponce,
  • Adriana Ortega,
  • John Makario Londoño,
  • María Luisa Monsalve,
  • Carlos Ospina,
  • Beatriz Galvis,
  • Jorge Alpala,
  • Lourdes Narváez,
  • Rosa Alpala,
  • Darío Arcos
Patricia Ponce
Servicio Geológico Colombiano
Adriana Ortega
Servicio Geológico Colombiano
John Makario Londoño
Servicio Geológico Colombiano
María Luisa Monsalve
Servicio Geológico Colombiano
Carlos Ospina
Servicio Geológico Colombiano
Beatriz Galvis
Servicio Geológico Colombiano
Jorge Alpala
Servicio Geológico Colombiano
Lourdes Narváez
Servicio Geológico Colombiano
Rosa Alpala
Servicio Geológico Colombiano
Darío Arcos
Servicio Geológico Colombiano
DOI: https://doi.org/10.18273/revbol.v46n1-2024001

Published 2024-03-08

Keywords

  • Volcanic structure,
  • Gravity anomaly,
  • Magnetic anomaly,
  • 2D geophysical modeling

How to Cite

Ponce, P., Ortega, A., Londoño, J. M., Monsalve, M. L., Ospina, C., Galvis, B., Alpala, J., Narváez, L., Alpala, R., & Arcos, D. (2024). Model of the inner structure of Puracé volcano and Los Coconucos Volcanic Chain, based on gravimetric and magnetic data. Boletín De Geología, 46(1), 13–31. https://doi.org/10.18273/revbol.v46n1-2024001

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Abstract

A gravimetry and magnetometry study was performed in the Puracé volcano and Los Coconucos volcanic chain (Colombia) influence zone, in order to obtain two 2D geophysical models of the main geological structures beneath of the studied area. During 2017, 272 points were measured, with data of gravimetry, magnetometry and coordinates with the Global Navigation Satellite System (GNSS), the field work was conditioned by the mountainous topography, dense high Andean forest vegetation and difficult access roads. Founded on the gravity and magnetic anomalies and with the available geological information, two 2D models were formulated with two profiles, one parallel to Coconucos Lineament and the other perpendicular to the first, both passing through the active cone of the Puracé volcano. The interpretation of these models, together with the geology of the area, allowed the modeling of bodies that are proposed as the internal structures of the Chagartón caldera, the Pre-Puracé and Actual Puracé volcanoes, and part of the magmatic chambers of the other eruptive centers of the Los Coconucos volcanic chain. These volcanic structures are apparently separated by limits or zones of weakness that suggest faults in depth and where these magma bodies were emplaced. The internal configuration of the Puracé volcano and the nearby eruptive centers, proposed in this work, also provides important information for the interpretation of the evolution of the Los Coconucos Volcanic Chain.

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