Título:
Stratigraphy and tectonic setting of the Barriga Negra Formation in Uruguay: an update
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Autor:
Núñez Demarco, Pablo Andrés
Masquelín, Enrique
Peel Canabal, Elena
Sánchez Bettucci, Leda
Masquelín, Enrique
Peel Canabal, Elena
Sánchez Bettucci, Leda
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Tipo de documento:
Artículo
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Palabras clave:
Barriga Negra Formation
Paleoenvironment
Sedimentation-tectonics
Neoproterozoic
South America
Paleoenvironment
Sedimentation-tectonics
Neoproterozoic
South America
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Año de publicación:
2019
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Resumen:
The aim of this work is to propose a new stratigraphic scheme of the Barriga Negra Formation, in order to solve the controversies in one of the most discussed units of Uruguay. Here, we introduce a new map (unmodified since 1984) and amend the stratigraphic profile for the Barriga Negra Formation, establishing the correct sequence, order and thickness, dividing it in four members (Volcaniclastic, Arkosic Conglomerate, Calcareous Conglomerate and Petromictic Conglomerate Member). We describe by first time the presence of basal volcanic and volcanoclastic rocks that implies a tectonic active environment. Volcaniclastic rock dating yield an U-Pb concordia age of 633 ± 3.4 Ma. Moreover, we show that this unit has no stratigraphic continuity with other units that previously were used to constrain its stratigraphic position, age and paleoenvironment. We confirm unequivocally that the unit is as a continental conglomeratic sequence deposited in arid and active tectonic conditions, and not transitional passive margin deposits as some works claim. Finally, we revisit the metamorphism, deformation, stratigraphy, structural relationships of this unit and identify new basement units. As consequence of this new evidence, we reexamine its correlation with other regional units. This work is also a key to understand the chaotic stratigraphic proposals of Uruguay.
Descripción:
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Sociedade Brasileira de Geologia
EN:
Brazilian Journal of Geology, 2019, 48(1): e20180047
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Citación:
Núñez Demarco, P, Masquelín, E, Peel Canabal, E. y otro "Stratigraphy and tectonic setting of the Barriga Negra Formation in Uruguay: an update". Brazilian Journal of Geology. [en línea] 2019, 48(1): e20180047. 24 h. DOI: 10.1590/2317-4889201920180047
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2317-4692
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Licencia:
Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| 10.15902317-4889201920180047.pdf | — | 17.53 MB | Adobe PDF |