Published

2021-07-19

Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)

Rasgos petrológicos de los diques de lamprófidos mesoproterozoicos de Montevideo (terreno Piedra Alta, sur de Uruguay)

DOI:

https://doi.org/10.15446/esrj.v25n2.89652

Keywords:

lamprophyres, petrology, geochronology, Uruguay (en)
lamprófidos, petrología, geocronología, Uruguay (es)

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Mafic dykes of lamprophyric affinity cropping out along the coastal area of Montevideo city are described. These dykes trend N75º-85º and crosscut 2.1 Ga Paleoproterozoic metamorphic units of the Rio de la Plata craton. They show mainly porphyritic textures with phlogopite and clinopyroxene macrocrysts in a groundmass composed of carbonates, phlogopite, augite, and feldspathoids. Ocellar structures filled by leucite, carbonates and fibrous alkaline amphibole are present. The mineralogical assembly allows their classification as lamprophyres (minettes), but according to their chemical nature, they can be classified as alkaline lamprophyres. A crystallization age of 1.42 Ga, by Ar-Ar method (on biotite/phlogopite) was obtained.

El presente trabajo describe a los diques máficos de afinidad lamprofídica presentes en la costa de la ciudad de Montevideo.  Estos diques presentan tendencias estructurales N75º-85º y recortan a unidades metamórficas Paleoproterozoicas de 2.1 Ga del cratón del Rio de la Plata. Presentan texturas principalmente porfiríticas con macrocristales de flogopita y clinopiroxeno en una matriz compuesta por carbonatos, flogopita, augita y feldespatoides. Se observa, además, la presencia de estructuras ocelares rellenas por leucita, carbonatos y anfíbol fibroso alcalino. La asamblea mineral presente en estos diques permite clasificarlos como lamprófidos (minettes), pero de acuerdo a su naturaleza química, pueden ser clasificados como lamprófidos alcalinos. Fue obtenida una edad de cristalización, por método Ar-Ar (en biotita/flogopita) de 1.42 Ga.

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How to Cite

APA

Muzio, R., Martino, N. and Peel, E. (2021). Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay). Earth Sciences Research Journal, 25(2), 157–168. https://doi.org/10.15446/esrj.v25n2.89652

ACM

[1]
Muzio, R., Martino, N. and Peel, E. 2021. Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay). Earth Sciences Research Journal. 25, 2 (Jul. 2021), 157–168. DOI:https://doi.org/10.15446/esrj.v25n2.89652.

ACS

(1)
Muzio, R.; Martino, N.; Peel, E. Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay). Earth sci. res. j. 2021, 25, 157-168.

ABNT

MUZIO, R.; MARTINO, N.; PEEL, E. Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay). Earth Sciences Research Journal, [S. l.], v. 25, n. 2, p. 157–168, 2021. DOI: 10.15446/esrj.v25n2.89652. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/89652. Acesso em: 18 apr. 2024.

Chicago

Muzio, Rossana, Natalia Martino, and Elena Peel. 2021. “Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)”. Earth Sciences Research Journal 25 (2):157-68. https://doi.org/10.15446/esrj.v25n2.89652.

Harvard

Muzio, R., Martino, N. and Peel, E. (2021) “Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)”, Earth Sciences Research Journal, 25(2), pp. 157–168. doi: 10.15446/esrj.v25n2.89652.

IEEE

[1]
R. Muzio, N. Martino, and E. Peel, “Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)”, Earth sci. res. j., vol. 25, no. 2, pp. 157–168, Jul. 2021.

MLA

Muzio, R., N. Martino, and E. Peel. “Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)”. Earth Sciences Research Journal, vol. 25, no. 2, July 2021, pp. 157-68, doi:10.15446/esrj.v25n2.89652.

Turabian

Muzio, Rossana, Natalia Martino, and Elena Peel. “Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)”. Earth Sciences Research Journal 25, no. 2 (July 19, 2021): 157–168. Accessed April 18, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/89652.

Vancouver

1.
Muzio R, Martino N, Peel E. Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay). Earth sci. res. j. [Internet]. 2021 Jul. 19 [cited 2024 Apr. 18];25(2):157-68. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/89652

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CrossRef citations2

1. Elena Peel, Rossana Muzio, Santiago Fort, Lucía Olivera. (2024). Precambrian basement rocks of the southernmost tip of the Paraná basin (Northern Uruguay): Petrologic assessment from deep borehole data. Precambrian Research, 404, p.107323. https://doi.org/10.1016/j.precamres.2024.107323.

2. Leda Sánchez Bettucci, Hugo Bonjour, Judith Loureiro Olivet, Elena Peel, Miguel Angelo Stipp Basei, Damián Dell′Acqua, Fernando Preciozzi. (2023). Geology and geochronology of Cerros San Juan formation (department of Colonia, Uruguay), Río de la Plata Craton. Journal of South American Earth Sciences, 130, p.104549. https://doi.org/10.1016/j.jsames.2023.104549.

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