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Mineralogy and geochemistry of Fe-Ti oxide ores from the Don Dieguito Massif-type anorthosite suite, Sierra Nevada de Santa Marta, Colombia

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doi: 10.18268/BSGM2020v72n3a200720
Authors:Betancur-Figueroa, Sebastián; Villanova-de-Benavent, Cristina; Proenza, Joaquín A.; Weber, Marion B.; Acevedo, Natalia; García-Casco, Antonio
Author Affiliations:Primary:
Universidad Nacional de Colombia, Departamento de Geociencias y Medio Ambiente, Medellin, Colombia
Pontifical Catholic University of Peru, Peru
Recursos del Caribe, United States
Universitat de Barcelona, Spain
Universidad de Granada, Spain
Volume Title:Mineral deposits of Latin America and the Caribbean
Volume Authors:Proenza, Joaquín Antonio, editor; Torró, Lisard; Nelson, Carl E.
Source:Mineral deposits of Latin America and the Caribbean, edited by Joaquín Antonio Proenza, Lisard Torró and Carl E. Nelson. Boletín de la Sociedad Geológica Mexicana, 72(3). Publisher: Sociedad Geológica Mexicana, Mexico, D.F., Mexico. ISSN: 0366-1784
Publication Date:2020
Note:In English with English and Spanish summaries. 60 refs.; illus., incl. geol. sketch maps, sects., 4 tables
Summary:Fe-Ti oxide ores are commonly associated with Proterozoic massif-type anorthosite bodies emplaced during the Grenville orogeny (∼1.2-1.0 Ga). Some of these anorthositic bodies occur in the northernmost part of the Santa Marta Massif, Colombia. They locally contain crosscutting Fe-Ti(-V) ore bodies between the El Hierro creek and the Don Dieguito river. We have distinguished two types of Fe-Ti(-V) ores: i) oxide-apatite norite (fine grained ilmenite and magnetite disseminated in an assemblage of apatite, amphibole, chlorite, rutile and sericitized plagioclase) and ii) banded nelsonite (coarser grained ilmenite, magnetite and apatite distributed in bands, with minor baddeleyite, srilankite and högbomite). Ilmenite in the two ore types display distinct hematite exsolution features: a) needle-like in the oxide-apatite norite ore; and b) two generations of exsolutions in the banded ore. Magnetite shows similar Ti and V contents in both ore types (0.4 wt % TiO2 and 0.5 wt % V2O3 on average in the oxide-apatite norite ore, 0.5 wt % TiO2 and 0.4 wt % V2O3 in the banded ore), whereas ilmenite has higher hematite, pyrophanite and geikielite components in the banded ore. The ores might have formed from the combination of fractional crystallization and magma mixing, with exsolution occurring probably at 575-600°C. This first detailed mineralogical and textural study of Fe-Ti(-V) oxide ores in anorthosite massifs from Colombia suggests that the Santa Marta Massif is an interesting target for future research.
Subjects:Anorthosite; Apatite; Banded structures; Cenozoic; Electron microscopy data; Electron probe data; Eocene; Exsolution; Fractional crystallization; Gabbros; Igneous rocks; Ilmenite; Iron ores; Iron oxides; Magmas; Magnetite; Metal ores; Metals; Mineralization; Mixing; Norite; Oxides; Paleogene; Phosphates; Plate tectonics; Plutonic rocks; Precambrian; Proterozoic; Rare earths; SEM data; Subduction; Tertiary; Titanium ores; Upper Precambrian; X-ray diffraction data; Colombia; Sierra Nevada de Santa Marta; South America; Buritaca Pluton; Don Dieguito Anorthosite; Don Dieguito Massif; El Hierro Creek; Los Mangos Granulite; Santa Marta Batholith
Coordinates:N071000 N073000 W0100000 W0112000
Record ID:897043-7
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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