Published

2023-11-10

Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling

Estructura crustal y tectónica del norte de Mozambique inferida por modelado de gravedad en 2D

DOI:

https://doi.org/10.15446/esrj.v27n3.101149

Keywords:

Geoid anomaly, Thermal analysis, crustal and lithospheric structure, gravity modeling (en)
Anomalía geoide, Análisis térmico, estructura crustal y litosférica, modelado de gravedad (es)

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Authors

  • Onofre Das Flores Lúrio University
  • Alanna C. Dutra FEDERAL UNIVERSITY OF BAHIA
  • Mário Lucas Lúrio University
  • Isac Abdulgani Lúrio University
  • Caisse Amisse Rovuma University

The northern region of Mozambique has a complex geological history, with an evolution that spans from the Precambrian Era to the Phanerozoic Era. In this work, we have integrated gravity and geothermal data to delineate the geotectonic evolution of the region, by estimating the thickness of the crust and the lithosphere through which was essential to generate a representative crustal model. It was necessary to complement the knowledge of structural geometry and tectonic evolution of the region. The data used in this study are the Bouguer and geoid anomalies, topography data, and radiogenic heat. These data were pre-processed, topography and geoid anomaly data were filtered by low-pass filter in the frequency and harmonic domains to remove undesirable effects associated with the sources. The data were used to estimate the thickness of the crust and lithosphere, as well as to determine the mean density distribution within the mantle. This was achieved by using a one-dimensional approach, considering the principle of local isostatic compensation, associated with equations governing the distribution of temperature in the crust. The Bouguer anomaly was used to generate a representative crustal 2D model of this region. The results showed that the crust is thinner in Nampula and Cabo Delgado provinces, with thickness ranging from 27 to 31 km, whereas in Niassa varies between 33 and 39 km.  The analysis of lithospheric thickness indicates that the provinces of Nampula and Cabo Delgado present a thinning of the lithosphere, with values ranging from 150 to 165 km. Rather than Niassa province which exhibits a thicker lithosphere, ranging from 165 to 195 km. The obtained results underwent a comparative analysis with prior investigations, unveiling a noteworthy concurrence among these findings.

La región norte de Mozambique tiene una historia geológica compleja, con una evolución que se extiende desde la Era Precámbrica hasta la Era Fanerozoica. En este trabajo hemos integrado datos de gravedad y geotermia para delinear la evolución geotectónica de la región, estimando el grosor de la corteza y la litosfera a través de la cual era esencial generar un modelo crustal representativo. Era necesario complementar el conocimiento de la geometría estructural y la evolución tectónica de la región. Los datos utilizados en este estudio son las anomalías de Bouguer y geoides, datos topográficos y calor radiogénico. Estos datos fueron pre-procesados, los datos de topografía y anomalía geoide fueron filtrados por filtro de paso bajo en la frecuencia y los dominios armónicos para eliminar efectos indeseables asociados con las fuentes. Los datos se utilizaron para estimar el espesor de la corteza y la litosfera, así como para determinar la distribución de densidad media dentro del manto. Esto se logró utilizando un enfoque unidimensional, considerando el principio de compensación isostática local, asociado con ecuaciones que rigen la distribución de la temperatura en la corteza. La anomalía de Bouguer se utilizó para generar un modelo 2D crustal representativo de esta región. Los resultados mostraron que la corteza es más delgada en las provincias de Nampula y Cabo Delgado, con un espesor que oscila entre 27 y 31 km, Considerando que en Niassa varía entre 33 y 39 km.  El análisis del espesor litosférico indica que las provincias de Nampula y Cabo Delgado presentan un adelgazamiento de la litosfera, con valores que van desde 150 a 165 km. En lugar de la provincia de Niassa, que exhibe una litosfera más gruesa, que van desde 165 a 195 km. Los resultados obtenidos se sometieron a un análisis comparativo con investigaciones anteriores, revelando una notable concurrencia entre estos hallazgos.

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How to Cite

APA

Das Flores, O., Dutra, A. C., Lucas, M., Abdulgani, I. and Amisse, C. (2023). Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling. Earth Sciences Research Journal, 27(3), 227–237. https://doi.org/10.15446/esrj.v27n3.101149

ACM

[1]
Das Flores, O., Dutra, A.C., Lucas, M., Abdulgani, I. and Amisse, C. 2023. Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling. Earth Sciences Research Journal. 27, 3 (Nov. 2023), 227–237. DOI:https://doi.org/10.15446/esrj.v27n3.101149.

ACS

(1)
Das Flores, O.; Dutra, A. C.; Lucas, M.; Abdulgani, I.; Amisse, C. Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling. Earth sci. res. j. 2023, 27, 227-237.

ABNT

DAS FLORES, O.; DUTRA, A. C.; LUCAS, M.; ABDULGANI, I.; AMISSE, C. Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling. Earth Sciences Research Journal, [S. l.], v. 27, n. 3, p. 227–237, 2023. DOI: 10.15446/esrj.v27n3.101149. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/101149. Acesso em: 9 aug. 2024.

Chicago

Das Flores, Onofre, Alanna C. Dutra, Mário Lucas, Isac Abdulgani, and Caisse Amisse. 2023. “Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling”. Earth Sciences Research Journal 27 (3):227-37. https://doi.org/10.15446/esrj.v27n3.101149.

Harvard

Das Flores, O., Dutra, A. C., Lucas, M., Abdulgani, I. and Amisse, C. (2023) “Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling”, Earth Sciences Research Journal, 27(3), pp. 227–237. doi: 10.15446/esrj.v27n3.101149.

IEEE

[1]
O. Das Flores, A. C. Dutra, M. Lucas, I. Abdulgani, and C. Amisse, “Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling”, Earth sci. res. j., vol. 27, no. 3, pp. 227–237, Nov. 2023.

MLA

Das Flores, O., A. C. Dutra, M. Lucas, I. Abdulgani, and C. Amisse. “Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling”. Earth Sciences Research Journal, vol. 27, no. 3, Nov. 2023, pp. 227-3, doi:10.15446/esrj.v27n3.101149.

Turabian

Das Flores, Onofre, Alanna C. Dutra, Mário Lucas, Isac Abdulgani, and Caisse Amisse. “Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling”. Earth Sciences Research Journal 27, no. 3 (November 10, 2023): 227–237. Accessed August 9, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/101149.

Vancouver

1.
Das Flores O, Dutra AC, Lucas M, Abdulgani I, Amisse C. Crustal and tectonic structure of Northern Mozambique inferred by 2D gravity modeling. Earth sci. res. j. [Internet]. 2023 Nov. 10 [cited 2024 Aug. 9];27(3):227-3. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/101149

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