El origen del intrusivo Potrerillos (Macará, Ecuador)

Christian Wladimir Romero Cóndor; Marilyn Del Cisne Castillo Jara; Leyla Lisbeth  Oñate Acurio; Fausto Rodolfo  Carranco Andino; Tito Salvador Vélez Suquilanda; Juan Gonzalo Torres Cartuche; Dayana Mishell Gómez Estevez; Hector Georgy Freire Cabrera; Vanessa Leonor Escobar Duche; Ana Belén  Gramal Aguiar; Darwin Patricio Condoy Guairacocha; Anibal Roberto Pulupa Vela; Diego Barona Diaz

doi:10.30550/j.agl/2023.34.1/2023-02-24

Authors

Christian Wladimir Romero Cóndor Intituto de Investigación Geológica y Energetica del Ecuador (IIGE)
Marilyn Del Cisne Castillo Jara Facultad de Geología, Minas, Petróleos y Ambiental, Universidad Central de Ecuador https://orcid.org/0000-0001-9406-2824
Leyla Lisbeth Oñate Acurio Departamento de Geología, Facultad de Geología y Petróleos, Escuela Politécnica Nacional
Fausto Rodolfo Carranco Andino Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecuatoriano, Instituto de Investigación Geológico y Energético – IIGE
Tito Salvador Vélez Suquilanda Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecua- toriano, Instituto de Investigación Geológico y Energético – IIGE
Juan Gonzalo Torres Cartuche Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecua- toriano, Instituto de Investigación Geológico y Energético – IIGE
Dayana Mishell Gómez Estevez Facultad de Geología, Minas, Petróleos y Ambiental, Universidad Central de Ecuador
Hector Georgy Freire Cabrera Departamento de Geología, Facultad de Geología y Petróleos, Escuela Politécnica Nacional
Vanessa Leonor Escobar Duche Facultad de Ciencias, Universidad de Salamanca
Ana Belén Gramal Aguiar Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecuatoriano, Instituto de Investigación Geológico y Energético – IIGE
Darwin Patricio Condoy Guairacocha Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecuatoriano, Instituto de Investigación Geológico y Energético – IIGE
Anibal Roberto Pulupa Vela Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecuatoriano, Instituto de Investigación Geológico y Energético – IIGE
Diego Barona Diaz Proyecto de Investigación Geológica y Disponibilidad de Recursos Minerales en el Territorio Ecua- toriano, Instituto de Investigación Geológico y Energético – IIGE

DOI:

https://doi.org/10.30550/j.agl/2023.34.1/2023-02-24

Keywords:

Petrography, Geochemistry, Alamor Lancones Basin, Ecuador

Abstract

New geological mapping campaigns in the Alamor-Lancones basin reported the Potrerillos intrusive east of Macará. This intrusive intrudes volcanoclastic rocks of the Ciano Formation. However, the intrusive's petrography, geochemistry, and age are unknown. This paper discusses the tectonic setting of the Potrerillos intrusive based on new lithostratigraphic, petrographic, and geochemical data collected in the Bocana La Laja to Vicin section. The quartz monzonites Potrerillos consist of a dome-like body, trending NE and 1.53 km long. Its mineralogy includes albite, oligoclase, microcline, quartz, hornblende, augite, and biotite, with a phaneritic, holocrystalline, and unequigranular texture. Major oxide concentrations indicate calc-alkaline potassium affinity, magnesium series, perluminic to metalluminic, saturated in silica. Low concentrations of Ta, P, Yb, Nb, Ti, Ni, Cr, and ratios Th/Yb, Ta/Yb, Th/Ta, Th/Hf, Ta/Hf, and relative enrichment in LREE and slight negative anomalies of Eu indicate that the the Potrerillos intrusive is linked to a volcanic arc on an active continental margin.

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