Early Cretaceous felsic volcanism in SE Uruguay
Early Cretaceous (~129 Ma) silicic rocks crop out in SE Uruguay between the Laguna Merín and Santa Lucía basins in the Lascano, Sierra São Miguel, Salamanca and Minas areas. They are mostly rhyolites with minor quartz-trachytes and are nearly contemporaneous with the Paraná–Etendeka igneous province...
Main Authors: | , , , , , , , |
---|---|
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
-Nagoya : Geochemical Society of Japan, Department of Earth Sciences, Nagoya University. -Bunkyo-ku, Tokyo,Japan: Business Center for Academic Societies Japan
2010
|
Subjects: | |
Online Access: | http://hdl.handle.net/11573/39328 |
id |
ftunivromairis:oai:iris.uniroma1.it:11573/39328 |
---|---|
record_format |
openpolar |
spelling |
ftunivromairis:oai:iris.uniroma1.it:11573/39328 2024-02-04T10:04:32+01:00 Early Cretaceous felsic volcanism in SE Uruguay LUSTRINO, Michele M. Marrazzo L. Melluso C. G. C. Tassinari P. Brotzu C. B. Gomes L. Morbidelli E. Ruberti Lustrino, Michele M., Marrazzo L., Melluso C. G. C., Tassinari P., Brotzu C. B., Gome L., Morbidelli E., Ruberti 2010 http://hdl.handle.net/11573/39328 eng eng -Nagoya : Geochemical Society of Japan, Department of Earth Sciences, Nagoya University. -Bunkyo-ku, Tokyo,Japan: Business Center for Academic Societies Japan volume:44 firstpage:1 lastpage:22 numberofpages:22 journal:GEOCHEMICAL JOURNAL http://hdl.handle.net/11573/39328 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79957941158 rhyolite paraná–etendeka uruguay lower crust crustal contamination info:eu-repo/semantics/article 2010 ftunivromairis 2024-01-10T18:07:50Z Early Cretaceous (~129 Ma) silicic rocks crop out in SE Uruguay between the Laguna Merín and Santa Lucía basins in the Lascano, Sierra São Miguel, Salamanca and Minas areas. They are mostly rhyolites with minor quartz-trachytes and are nearly contemporaneous with the Paraná–Etendeka igneous province and with the first stages of South Atlantic Ocean opening. A strong geochemical variability (particularly evident from Rb/Nb, Nb/Y trace element ratios) and a wide range of Sr–Nd isotopic ratios (143Nd/144Nd(129) = 0.51178–0.51209; 87Sr/86Sr(129) = 0.70840–0.72417) characterize these rocks. Geochemistry allows to distinguish two compositional groups, corresponding to the north-eastern (Lascano and Sierra São Miguel, emplaced on the Neo-Proterozoic southern sector of the Dom Feliciano mobile belt) and south-eastern localities (Salamanca, Minas, emplaced on the much older (Archean) Nico Perez terrane or on the boundary between the Dom Feliciano and Nico Perez terranes). These compositional differences between the two groups are explained by variable mantle source and crust contributions. The origin of the silicic magmas is best explained by complex processes involving assimilation and fractional crystallization and mixing of a basaltic magma with upper crustal lithologies, for Lascano and Sierra São Miguel rhyolites. In the Salamanca and Minas rocks genesis, a stronger contribution from lower crust is indicated. Article in Journal/Newspaper South Atlantic Ocean Sapienza Università di Roma: CINECA IRIS Uruguay Perez ENVELOPE(-69.117,-69.117,-68.517,-68.517) Lucía ENVELOPE(-57.033,-57.033,-63.450,-63.450) |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
rhyolite paraná–etendeka uruguay lower crust crustal contamination |
spellingShingle |
rhyolite paraná–etendeka uruguay lower crust crustal contamination LUSTRINO, Michele M. Marrazzo L. Melluso C. G. C. Tassinari P. Brotzu C. B. Gomes L. Morbidelli E. Ruberti Early Cretaceous felsic volcanism in SE Uruguay |
topic_facet |
rhyolite paraná–etendeka uruguay lower crust crustal contamination |
description |
Early Cretaceous (~129 Ma) silicic rocks crop out in SE Uruguay between the Laguna Merín and Santa Lucía basins in the Lascano, Sierra São Miguel, Salamanca and Minas areas. They are mostly rhyolites with minor quartz-trachytes and are nearly contemporaneous with the Paraná–Etendeka igneous province and with the first stages of South Atlantic Ocean opening. A strong geochemical variability (particularly evident from Rb/Nb, Nb/Y trace element ratios) and a wide range of Sr–Nd isotopic ratios (143Nd/144Nd(129) = 0.51178–0.51209; 87Sr/86Sr(129) = 0.70840–0.72417) characterize these rocks. Geochemistry allows to distinguish two compositional groups, corresponding to the north-eastern (Lascano and Sierra São Miguel, emplaced on the Neo-Proterozoic southern sector of the Dom Feliciano mobile belt) and south-eastern localities (Salamanca, Minas, emplaced on the much older (Archean) Nico Perez terrane or on the boundary between the Dom Feliciano and Nico Perez terranes). These compositional differences between the two groups are explained by variable mantle source and crust contributions. The origin of the silicic magmas is best explained by complex processes involving assimilation and fractional crystallization and mixing of a basaltic magma with upper crustal lithologies, for Lascano and Sierra São Miguel rhyolites. In the Salamanca and Minas rocks genesis, a stronger contribution from lower crust is indicated. |
author2 |
Lustrino, Michele M., Marrazzo L., Melluso C. G. C., Tassinari P., Brotzu C. B., Gome L., Morbidelli E., Ruberti |
format |
Article in Journal/Newspaper |
author |
LUSTRINO, Michele M. Marrazzo L. Melluso C. G. C. Tassinari P. Brotzu C. B. Gomes L. Morbidelli E. Ruberti |
author_facet |
LUSTRINO, Michele M. Marrazzo L. Melluso C. G. C. Tassinari P. Brotzu C. B. Gomes L. Morbidelli E. Ruberti |
author_sort |
LUSTRINO, Michele |
title |
Early Cretaceous felsic volcanism in SE Uruguay |
title_short |
Early Cretaceous felsic volcanism in SE Uruguay |
title_full |
Early Cretaceous felsic volcanism in SE Uruguay |
title_fullStr |
Early Cretaceous felsic volcanism in SE Uruguay |
title_full_unstemmed |
Early Cretaceous felsic volcanism in SE Uruguay |
title_sort |
early cretaceous felsic volcanism in se uruguay |
publisher |
-Nagoya : Geochemical Society of Japan, Department of Earth Sciences, Nagoya University. -Bunkyo-ku, Tokyo,Japan: Business Center for Academic Societies Japan |
publishDate |
2010 |
url |
http://hdl.handle.net/11573/39328 |
long_lat |
ENVELOPE(-69.117,-69.117,-68.517,-68.517) ENVELOPE(-57.033,-57.033,-63.450,-63.450) |
geographic |
Uruguay Perez Lucía |
geographic_facet |
Uruguay Perez Lucía |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
volume:44 firstpage:1 lastpage:22 numberofpages:22 journal:GEOCHEMICAL JOURNAL http://hdl.handle.net/11573/39328 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79957941158 |
_version_ |
1789973070857895936 |