Geology, geochronology and geochemistry of the El Alacrán Deposit, San Matías District, Cordoba-Colombia
department or school: Science, Faculty of
department or school: Earth, Ocean and Atmospheric Sciences, Department of
data provider: DSpace
degree campus: UBCV
creator: Manco, Julián David
issued: 2020-05-12T17:59:04Z
issued: 2020
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The El Alacrán Deposit is located in the San Matías District (SMD) in the Northern Western Cordillera of Colombia and is associated with a Late Cretaceous pre-accretional island arc environment of the Calima Terrane. The El Alacrán Deposit comprises a replacement style of mineralization that trends northerly for about 1 km and has a vertical extent of >200 m. Ore is primarily hosted within a calcareous volcanoclastic sequence (Unit 2), which was intruded by a series of andesitic sills and tonalites (e.g. the El Alacrán Oeste Tonalite). The El Alacrán Deposit contains total resources of 82.15 Mt of 0.73-0.49% CuEq which represents ~ 87% of the total mineral resources of the SMD (94.9 Mt@ 0.71% Eq. Cu, Cordoba Minerals Corp., 2019b). The genesis and evolution of the El Alacrán Deposit had not been properly established, thus making it challenging to explore for similar deposits in the SMD. This thesis presents the results of petrographic, geochronologic (U-Pb, Ar-Ar, Re-Os), and isotopic (Pb, S) characterization of the El Alacrán Deposit ores and related representative units and prospects of the SMD. The hydrothermal alteration assemblages of the El Alacrán Deposit are zoned from early high-temperature calc-silicate alteration to a subsequent calc-potassic, sericitic, and carbonate base metal (CBM) alteration. The mineral paragenesis indicates at least three different gold precipitation events: 1) associated with pyrite – mushketovite in the calc-silicate alteration; 2) precipitation of Au electrum with chalcopyrite, traces of the pyrrhotite and molybdenite in the calc-potassic and sericitic alteration; and 3) as visible grains in the carbonate base metal-related alteration. The mineral paragenesis, Ar-Ar dates, Pb and S isotopic composition (δ34S ~ 11‰) from the El Alacrán Deposit can be explained by two different magmatic fluids with a marked interaction with seawater. The magmatic fluids might have been sourced from the El Alacrán Oeste Tonalite and a concealed intr…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/74407
note: GEOLOGY, GEOCHRONOLOGY AND GEOCHEMISTRY OF THE EL ALACRÁN DEPOSIT, SAN MATÍAS DISTRICT, CORDOBA-COLOMBIA by Julián David Manco B.Sc., Universidad Nacional de Colombia-Medellín, 2010 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Geological Sciences) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) April 2020 © Julián David Manco, 2020 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis/dissertation entitled: GEOLOGY, GEOCHRONOLOGY AND GEOCHEMISTRY OF THE EL ALACRÁN DEPOSIT, SAN MATÍAS DISTRICT, CORDOBA-COLOMBIA submitted by Julian David Manco in partial fulfillment of the requirements for the degree of Master of Science in Geological Sciences Examining Committee: Dr. Craig Hart Supervisor. Mineral Desposit Research Unit (MDRU) Director; EOAS department professor, UBC. Dr. Hildebrando Leal Mejía Co-supervisor, Mineral Desposit Research Unit (MDRU) research associate. Dr. Greg Dipple Supervisory Committee Member, Bradshaw Research Initiative for Minerals and Mining (BRIMM) Director; EOAS department professor, UBC. Dr. Lori Kennedy Additional Examiner, EOAS Department professor. Additional Supervisory Committee Members: Supervisory Committee Member Supervisory Committee Member iii Abstract The El Alacrán Deposit is located in the San Matías District (SMD) in the Northern Western Cordillera of Colombia and is associated with a Late Cretaceous pre-accretional island arc environment of the Calima Terrane. The El Alacrán Deposit comprises a replacement style of mineralization that trends northerly for about 1 km and has a vertical extent of >200 m. Ore is primarily hosted within a calcareous volcanoclastic sequence (Unit 2), which was intruded by a series of andesitic sills and tonalites (e.g. the El Alacrán Oeste Tonalite). The El Alacrán Deposit contains total resources of 82…
has type: Thesis/Dissertation
date issued: 2020-11
is shown at: 10.14288/1.0390466
language: eng
degree discipline: Geological Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/74407