The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay
The southeastern border of the Laguna Merín Basin (Rocha Department, East Uruguay) consists of Mesozoic volcanic deposits of the Puerto Gómez and Arequita formations, overlain by a sedimentary cover of Cenozoic and recent deposits. Wellpreserved lava flow and pyroclastic deposits have been identifi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Asociación Argentina de Sedimentología
2021-03-01
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| Series: | Latin American Journal of Sedimentology and Basin Analysis |
| Online Access: | https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/102 |
| _version_ | 1797386585212190720 |
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| author | Rossana Muzio Sauer Ethel Morales Gerardo Veroslavsky Bruno Conti |
| author_facet | Rossana Muzio Sauer Ethel Morales Gerardo Veroslavsky Bruno Conti |
| author_sort | Rossana Muzio Sauer |
| collection | DOAJ |
| description |
The southeastern border of the Laguna Merín Basin (Rocha Department, East
Uruguay) consists of Mesozoic volcanic deposits of the Puerto Gómez and Arequita
formations, overlain by a sedimentary cover of Cenozoic and recent deposits. Wellpreserved
lava flow and pyroclastic deposits have been identified in the Arequita Formation
after detailed mapping (1.50.000) in Sierra de los Ajos region. The present study focuses
on the petrographic characterization of this felsic volcanism, with special emphasis on
the pyroclastic units. Differences in the structural and petrographic distribution of these
volcanic units are related to the N20ºE trending India Muerta Lineament. East of this
lineament, SiO2-rich rhyolites and pyroclastic deposits (ignimbrites) are present whereas
to the west, the volcanic rocks are mainly represented by basic to felsic lavas. Based
on petrographic features and regional distribution, explosive mechanisms have been
assigned to some of the volcanic units, interpreted as pyroclastic flow and pyroclastic
surge deposits.
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| first_indexed | 2024-03-08T22:11:32Z |
| format | Article |
| id | doaj.art-9da8cc6043404340b09b9e72094a7d28 |
| institution | Directory Open Access Journal |
| issn | 1669-7316 1851-4979 |
| language | English |
| last_indexed | 2024-03-08T22:11:32Z |
| publishDate | 2021-03-01 |
| publisher | Asociación Argentina de Sedimentología |
| record_format | Article |
| series | Latin American Journal of Sedimentology and Basin Analysis |
| spelling | doaj.art-9da8cc6043404340b09b9e72094a7d282023-12-19T06:18:12ZengAsociación Argentina de SedimentologíaLatin American Journal of Sedimentology and Basin Analysis1669-73161851-49792021-03-01161The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east UruguayRossana Muzio SauerEthel MoralesGerardo VeroslavskyBruno Conti The southeastern border of the Laguna Merín Basin (Rocha Department, East Uruguay) consists of Mesozoic volcanic deposits of the Puerto Gómez and Arequita formations, overlain by a sedimentary cover of Cenozoic and recent deposits. Wellpreserved lava flow and pyroclastic deposits have been identified in the Arequita Formation after detailed mapping (1.50.000) in Sierra de los Ajos region. The present study focuses on the petrographic characterization of this felsic volcanism, with special emphasis on the pyroclastic units. Differences in the structural and petrographic distribution of these volcanic units are related to the N20ºE trending India Muerta Lineament. East of this lineament, SiO2-rich rhyolites and pyroclastic deposits (ignimbrites) are present whereas to the west, the volcanic rocks are mainly represented by basic to felsic lavas. Based on petrographic features and regional distribution, explosive mechanisms have been assigned to some of the volcanic units, interpreted as pyroclastic flow and pyroclastic surge deposits. https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/102 |
| spellingShingle | Rossana Muzio Sauer Ethel Morales Gerardo Veroslavsky Bruno Conti The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay Latin American Journal of Sedimentology and Basin Analysis |
| title | The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay |
| title_full | The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay |
| title_fullStr | The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay |
| title_full_unstemmed | The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay |
| title_short | The Arequita Formation (Lower Cretaceous): Petrographic features of the volcanic facies In the Laguna Merín Basin, east Uruguay |
| title_sort | arequita formation lower cretaceous petrographic features of the volcanic facies in the laguna merin basin east uruguay |
| url | https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/102 |
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