Discrimination of the metasedimentary rocks sequence of the Oyacachi River, in San Marcos, Ecuador.

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Published: 2022-10-22
Keywords:
Napo Fm, Ammonites, Geochemistry

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Christian Wladimir Romero
Instituto de Investigación Geológico y Energético
Fausto Carranco
Instituto de Investigación Geológico y Energético
Ana Gramal
Instituto de Investigación Geológico y Energético
Roberto Pulupa
Instituto de Investigación Geológico y Energético
Tito Velez
Instituto de Investigación Geológico y Energético
Natalie Cerny
Charles University
Milada Dvorák
Charles University
Jenny Granja
Escuela Politécnica de Chimborazo
Paola Pazmiño
Escuela Politécnica Nacional
Israel Carranco
Escuela Politécnica Nacional

Abstract

To the north of the Napo Uplift, in the Oyacachi river, at the San Marcos, indiscriminate sequences of phyllites, metamorphosed mudstones, and deformed limestones were grouped in the Upano Unit by previous research. This research displays the litho-stratigraphic analysis, fossil record, and geochemistry detail. This sequence included black calcareous phyllites and slate (FPC), metamorphosed black mudstone (LNC), fine calcareous sandstones (AFC), massive limestones (Cs), wackstone-limestones (CWs), mudstone-limestones (CMs). The record fossil included ammonites Lyelliceras sp., Mantelliceras sp, Dipoloceras sp y Oxytopidoceras sp. High proportions of the Al2O3, Fe2O3 y MgO regarding SiO2 and Th, Rb, Sr y Ba ratios suggest that this sequence was deposited in the shallow marine environment in a passive marge. Lithostratigraphic data, the fossil record, and geochemistry detail link this meta-sedimentary sequence with Napo Formation of the Oriente Basin.

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Issue

Vol. 5 No. 2 (2022): Revista Científica GeoLatitud

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Artículos

This work is licensed under CC BY 4.0

Author Biographies

Christian Wladimir Romero, Instituto de Investigación Geológico y Energético

Christian Romero, was born in Quito, Ecuador in 1992. He received his degree in Geology Engineering from the Escuela Politécnica Nacional; he has participated as a speaker at the VII Jornadas de Ciencias de la Tierra, EPN in 2017; as a speaker at the American Association of Petroleum Geologists, AAPG in 2018 and 2019; at the 8th-ISAG in 2019, at the Geological Society of America, GSA in 2020. He has two diplomas: Quaternary Geology; Stratigraphy and Sedimentology Since 2019 he is a fellow of the International Atomic Energy Agency. His research field is related to Sedimentology and Stratigraphy applied to regional geology and paleoenvironmental reconstructions. He is currently working on the Geological Research Project and Availability of Mineral Occurrences in the Ecuadorian Territory developed by the Institute of Geological and Energy Research.

Fausto Carranco, Instituto de Investigación Geológico y Energético

Fausto Carranco was born in Quito, Ecuador in 1983. He received his Engineering degree in Geology from the University of Ecuador in 2008. He received his Master's degree in Geological Processes and Resources from the Complutense University of Madrid in 2017. He has worked as a regional geologist in several public and private companies with 15 years of experience. He served as a lecturer at the Faculty of Geology, Mines, Petroleum and Environmental of the Central University of Ecuador. He has publications in national and foreign indexed journals. He has published three binational geological maps Ecuador - Peru, scale 1:100,000; in conjunction with INGEMMET. Currently he is the leader of the Regional Geology group at the Institute of Geological and Energy Research (IIGE).

Ana Gramal, Instituto de Investigación Geológico y Energético

Ana Belén Gramal Aguilar, was born in Quito, Ecuador in 1990. She received her degree in Geology Engineering from the Central University of Ecuador in 2017. She has participated in the elaboration of the project "Redefinition and Characterization of the Ibarra hydrogeological unit and the Machala hydrogeological unit" at the National Institute of Hydrology and Meteorology (INAMHI) in 2016. Additionally, she participated in the survey of geochemical prospecting information (fluvial sediments) in the Alamor topographic sheet scale 1: 50 000, developed by the National Research Institute, Geological, Mining, Metallurgical current (IIGE). She is currently working as a Geologist at the Instituto de Investigación Geológico y Energético (IIGE).

Roberto Pulupa, Instituto de Investigación Geológico y Energético

Roberto Pulupa, was born in Quito, Ecuador (1983). Engineer in Geology from the Central University of Ecuador (FIGEMPA, 2011). Master in Risk Prevention and Management (IAEN, 2021), his academic and work training has focused on the study of Mass Movements. He has participated in the elaboration of Zoning of Susceptibility for Mass Movements, both in the Sierra and Coastal Regions. In the Geological Research and Availability of Mineral Resources in the Ecuadorian Territory project, he has participated as leader in the updating of the geological sheets scale 1:100,000. He is currently working as a Specialist in Regional, Applied and Economic Geology at the Innovation Department of the Institute of Geological and Energy Research (IIGE).

Tito Velez, Instituto de Investigación Geológico y Energético

Tito Velez was born in Loja, Ecuador in 1984. He received his degree in Environmental Geology and Land Management Engineering from the National University of Loja in 2009. He has participated in the "2D Coastal Seismic Exploration" project for Petroproducción, a subsidiary of Petroecuador, in 2010. Project "Pilot Model for the Determination of the Geological-Mineralogical Potential of the Zaruma and Cariamanga Zones at a Scale of 1:100,000" at the Instituto de Investigación Geológico Minero Metalurgico actual (IIGE) in 2012. Additionally, he has participated in the project of Geological Research and Availability of Mineral Resources in the Ecuadorian Territory, updating the geological sheets scale 1:100,000. Currently, he works as a geologist with 8 years of experience at the Instituto de Investigacion Geologico y Energético (IIGE)

Natalie Cerny, Charles University

Natálie Černý, was born in Plzeň, Czech Republic, in 1993. In 2015 she obtained her degree in Earth Sciences at the "Institute of Hydrogeology, Engineering Geology and Applied Geophysics" of the Faculty of Science at Charles University, Prague, Czech Republic. In 2018 he obtained a Master's degree in Biology with a major in Paleontology and Fossil Record at East Tennessee State University, USA. In 2018 he participated in the EU-funded Horizon Europe program studying the evolution of the Carbon Footprint in Europe.

Milada Dvorák, Charles University

Milada Dvořák, born in Linz, Austria, in 1995 obtained her degree in Earth Sciences at the Faculty of Earth Sciences, Geography and Astronomy of the University of Wien. In 2019 he obtained a master's degree in Inorganic Geochemistry with mention in Mineral Resources Exploration at Institute of Hydrogeology, Engineering Geology and Applied Geophysics" of the Faculty of Science at Charles University, Prague, Czech Republic.

Jenny Granja, Escuela Politécnica de Chimborazo

Jenny Granja, born in Sucumbíos - Ecuador in 1988, obtained a degree in Geology Engineering at the Central University of Ecuador, worked in several private companies in the oil industry, and environment. In 2016 she received a Master's degree in Geology Applied to Energy and Mineral Resources at the University of Granada, Spain. In 2017 he starts as a teacher and in 2018 he enters the Escuela Superior Politécnica de Chimborazo (ESPOCH) in the career of Mines, he has published five scientific articles. In 2020 he worked on several important geotechnical projects for the country and in November of the same year he returned to teaching at ESPOCH until today.

Paola Pazmiño, Escuela Politécnica Nacional

Paola Pazmiño, was born in Quito, Ecuador in 1998. She participated in Expominas 2021 as an exhibitor for SEG-EPN. She participated as a liaison assistant for the GEOLAB Project. Participated in virtual internships at the French Government's Research Institute for Development (IRD) in 2021. He is currently a ninth semester student of Geological Engineering at the National Polytechnic School and is participating as an intern at the Institute of Geological and Energy Research (IIGE).


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How to Cite

Discrimination of the metasedimentary rocks sequence of the Oyacachi River, in San Marcos, Ecuador. (C. W. Romero, F. Carranco, A. Gramal, R. Pulupa, T. Velez, N. Cerny, M. Dvorák, J. Granja, P. Pazmiño, & I. Carranco, Trans.). (2022). Revista Científica GeoLatitud, 5(2), 1-13. https://geolatitud.geoenergia.gob.ec/index.php/GeoLatitud/article/view/128

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