Epithermal fluids evolution related to an IOCG system in Cerro Colorado Chico

Authors

  • Orlando Bazan Santa Cruz Universidad Nacional Mayor de San Marcos, Facultad de Ingeniería Geológica, Minera, Metalúrgica y Geográfica, Unidad de Postgrado, Lima, Peru https://orcid.org/0000-0002-7764-9460
  • Jesús Alberto Torres Guerra Universidad Nacional Mayor de San Marcos, Facultad de Ingeniería Geológica, Minera, Metalúrgica y Geográfica, Unidad de Postgrado, Lima, Peru

DOI:

https://doi.org/10.15381/iigeo.v26i51.24710

Keywords:

Cerro Colorado Chico, epithermal fluids, fluid inclusions, microthermometry, quartz POD

Abstract

Cerro Colorado Chico located in Ancash region, northern coast of Peru. Brecciated siliceous bodies occur with restricted halos of advanced argillic alteration silica-pyrophyllite-alunite and extensive silica-sericite-pyrite alteration, breccias and hematite bodies, hematitized horizons into volcano-sedimentary rocks of the Casma Group. A microthermometry study of fluid inclusions has been carried out in 4 samples with a total of 55 primary and secondary fluid inclusions in quartz. Two stages are distinguished, the first at mesothermal temperatures between 605° and 560° C with salinities of 47.66% to 44.82% NaCl eq., and the second at epithermal temperatures between 329° and 138° C with salinities of 0.7%. to 9.73% NaCl eq., with complex fluids evolution processes as cooling, dilution, mixing and boiling. This study permit to explain the processes that take place in the epithermal environment of IOCG-type magmatic-hydrothermal systems from fluids derived of silica-rich silicate melts that partition from poorly differentiated magmas, when decompressed separate into a dense saline liquid phase and a low-density vapor phase that rises to the upper levels and is responsible for the formation of the brecciated siliceous bodies and the advanced argillic alteration.

Author Biography

  • Orlando Bazan Santa Cruz, Universidad Nacional Mayor de San Marcos, Facultad de Ingeniería Geológica, Minera, Metalúrgica y Geográfica, Unidad de Postgrado, Lima, Peru

    Ingeniero geólogo, maestrando en Geología con mención en Recursos Mineros en la Universidad Nacional Mayor de San Marcos. Ha participado en diversas campañas de exploración greenfield y brownfield en el centro y sur del Perú por depósitos polimetálicos tipo Skarn, IOCG, VMS, Pórfidos y Epitermales. Investiga temas relacionados a: geotectónica, metalogenia y geoquímica con énfasis en la exploración de recursos minerales metálicos.

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Published

2023-03-30

Issue

Vol. 26 No. 51 (2023)

Section

Artículos

License

Copyright (c) 2023 Orlando Bazan Santa Cruz, Jesús Alberto Torres Guerra

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

AUTHORS RETAIN THEIR RIGHTS:

a. Authors retain their trade mark rights and patent, and also on any process or procedure described in the article.

b. Authors retain their right to share, copy, distribute, perform and publicly communicate their article (eg, to place their article in an institutional repository or publish it in a book), with an acknowledgment of its initial publication in the Rev. Inst. investig. Fac. minas metal cienc. geogr.

c. Authors retain theirs right to make a subsequent publication of their work, to use the article or any part thereof (eg a compilation of his papers, lecture notes, thesis, or a book), always indicating the source of publication (the originator of the work, journal, volume, number and date).

How to Cite

Bazan Santa Cruz, O., & Torres Guerra, J. A. (2023). Epithermal fluids evolution related to an IOCG system in Cerro Colorado Chico. Revista Del Instituto De investigación De La Facultad De Minas, Metalurgia Y Ciencias geográficas, 26(51), e24710. https://doi.org/10.15381/iigeo.v26i51.24710