Geochronology, Petrography, Geochemical Constraints, and Fluid Characterization of the Buriticá Gold Deposit, Antioquia Department, Colombia

• Author / Creator

  Lesage, Guillaume

• Buriticá is a low- to intermediate-sulfidation epithermal gold deposit located 75 km north of Medellín, in Colombia. It is hosted by the Buriticá andesite porphyry, a shallow intrusive rock dated at 7.41 ± 0.40 Ma (40Ar/39Ar on hornblende), which intrudes the Cretaceous Cañasgordas Group and Buriticá stock.
  Gold mineralization is associated with a proximal sericite-adularia and a distal epidote-rich propylitic alteration, and is hosted in two different sets of veins respectively striking and dipping around 072°/87°S and 105°/87°S. Hydrothermal sericite yields an age of 7.74 ± 0.08 Ma.
  Sulfur isotope and fluid inclusion data indicate that a hot and saline fluid (>300°C, average 5.5 wt.% NaCl equiv.) of magmatic origin mixed with a cooler and less saline meteoric fluid. Boiling conditions were observed in quartz crystals coeval with the timing of gold mineralization, therefore boiling is believed to be the main control on gold precipitation.

• Subjects / Keywords

  • Buriticá Gold Deposit

• Graduation date

  Fall 2011

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R35M0M

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.