T269 The Geology of Colombia (Posters)

Wednesday, 7 November 2018
9:00 AM - 6:30 PM
Halls J-K

THE COLOMBIAN GEOCHRONOLOGICAL DATABASE (CGD)

Paper number: T269-2
Program: Technical Sessions
Time: 9:00 AM – 6:30 PM

Authors

Abstract

Geochronological databases are powerful tools for characterizing the age spectra of a region and allows comparison with other areas. The use of such large datasets is becoming increasingly available but only a few countries or research groups are so far engaged in the painstaking work of constructing international database systems. Following the work of Gómez et al. (2015), a group of students of the Department of Geoscience at Universidad de los Andes (Colombia) is undertaking the task of creating an up-to-date and comprehensive geochronological database of the country. This database will constantly be updated and is estimated to contain about 90 percent of all radiometric ages on dated rock samples published since the early 1960s.

The Colombian Geochronological Database (CGD) is a compilation of more than 40 000 published U/Pb, K/Ar, Ar/Ar, fission track (apatite and zircon), U-Th/He, Re/Os, Rb/Sr, and Sm/Nd ages. In addition, Hf-in-zircon model ages have been included for some intrusive igneous bodies and provide complementary information on the nature/origin of the magmas and their likely origin. Accompanying each age are geographic coordinates of the dated samples as well as information about lithological units and interpretative information extracted from the respective publications. The radiometric data are presented in StratDB/DataView (Eglington, 2004; 2009). The structure of the database provides a powerful interface for constructing queries and allow us to extract information on specific units, isotopic systems, age interpretations, provinces, terranes, references, etc. This information establishes a very good framework for regional geological interpretations with geochronological, stratigraphic, structural and paleogeographic implications. Histograms and maps are produced with this database to summarize the geological history of Colombia since Precambrian times. Ages are discussed for different time windows and focus on events relevant to the evolution of northern South America.

References

Eglington, B.M. 2004. Computers & Geosciences, v. 30, p. 847-858

Eglington et al., 2009. Spec. Publ. Geol. Soc. London, v. 323, p. 27-47.

Gómez et al., 2015. SGC, Publicaciones Geológicas Especiales 33, p. 9–33. Bogotá.

Geological Society of America Abstracts with Programs. Vol. 50, No. 6

doi: 10.1130/abs/2018AM-319817

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