Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism
The early Cretaceous (~130 Ma) igneous complex of Valle Chico (SE Uruguay) is made up of felsic plutonic and subordinate volcanic rocks and dykes cropping out over an area of about 250 km2. This complex is strictly linked with the formation of the Parana ́–Etendeka Igneous Province and the first sta...
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-Amsterdam Netherlands: Elsevier BV -Oslo : Universitetsforlaget
2005
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Online Access: | http://hdl.handle.net/11573/37650 https://doi.org/10.1016/j.lithos.2004.07.004 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000229717600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-19044393445&partnerID=65&md5=1cb408adbfb57d1e1d5058ef7d39c4cf |
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ftunivromairis:oai:iris.uniroma1.it:11573/37650 2024-04-21T08:11:35+00:00 Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism LUSTRINO, Michele MELLUSO L. BROTZU P. GOMES G. B. MORBIDELLI L. MUZIO R. RUBERTI E. TASSINARI C. C. G. Lustrino, Michele Melluso, L. Brotzu, P. Gomes, G. B. Morbidelli, L. Muzio, R. Ruberti, E. Tassinari, C. C. G. 2005 STAMPA http://hdl.handle.net/11573/37650 https://doi.org/10.1016/j.lithos.2004.07.004 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000229717600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-19044393445&partnerID=65&md5=1cb408adbfb57d1e1d5058ef7d39c4cf unknown -Amsterdam Netherlands: Elsevier BV -Oslo : Universitetsforlaget info:eu-repo/semantics/altIdentifier/wos/WOS:000229717600008 volume:82 firstpage:407 lastpage:434 journal:LITHOS http://hdl.handle.net/11573/37650 doi:10.1016/j.lithos.2004.07.004 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-19044393445 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000229717600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-19044393445&partnerID=65&md5=1cb408adbfb57d1e1d5058ef7d39c4cf Uruguay Cretaceou CFB Paranà granitoid info:eu-repo/semantics/article 2005 ftunivromairis https://doi.org/10.1016/j.lithos.2004.07.004 2024-03-28T02:13:27Z The early Cretaceous (~130 Ma) igneous complex of Valle Chico (SE Uruguay) is made up of felsic plutonic and subordinate volcanic rocks and dykes cropping out over an area of about 250 km2. This complex is strictly linked with the formation of the Parana ́–Etendeka Igneous Province and the first stages of the South Atlantic Ocean rifting. The plutonic rocks range from quartz-monzonite to syenite, quartz-syenite and granite. The volcanic rocks and the dykes range from quartz-latite to trachyte and rhyolite; no substantial differences in term of chemical composition have been found between plutonic and volcanic rocks. Only a sample of basaltic composition (with tholeiitic affinity) has been sampled associated with the felsic rocks. The Agpaitic Index of the Valle Chico felsic rocks range from 0.72 to 1.34, with the peralkaline terms confined in the most evolved samples (SiO2N65 wt.%). Initial 87Sr/86Sr(130) of the felsic rocks range from 0.7046 to 0.7201, but the range of 87Sr/86Sr of low-Rb/Sr samples cluster at 0.7083; 143Nd/144Nd(130) ratios range from 0.5121 (syenite) to 0.5117 (granite). The tholeiitic basalt show more depleted isotopic compositions (87Sr/86Sr(130)=0.7061; 143Nd/144Nd(130)=0.5122), and plots in the field of other early Cretaceous low-Ti basaltic rocks of SE Uruguay. The radiogenic Sr and unradiogenic Nd of the Valle Chico felsic rocks require involvement of lower crustal material in their genesis either as melt contaminant or as protolith (crustal anatexis). In particular, most of the Valle Chico (VC) felsic rocks define a near-vertical array in Sr–Nd isotopic spaces, pointing toward classical EMI-type composition; this feature is considered to reflect a lower crust involvement as observed for other mafic and felsic rocks of the Parana ́–Etendeka Igneous Province. Decompression melting of the lower crust related to Gondwana continental rifting before the opening of the South Atlantic Ocean or the presence of thermal anomalies related to the Tristan plume may have induced the lower crust to ... Article in Journal/Newspaper South Atlantic Ocean Sapienza Università di Roma: CINECA IRIS Lithos 82 3-4 407 434 |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
unknown |
topic |
Uruguay Cretaceou CFB Paranà granitoid |
spellingShingle |
Uruguay Cretaceou CFB Paranà granitoid LUSTRINO, Michele MELLUSO L. BROTZU P. GOMES G. B. MORBIDELLI L. MUZIO R. RUBERTI E. TASSINARI C. C. G. Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
topic_facet |
Uruguay Cretaceou CFB Paranà granitoid |
description |
The early Cretaceous (~130 Ma) igneous complex of Valle Chico (SE Uruguay) is made up of felsic plutonic and subordinate volcanic rocks and dykes cropping out over an area of about 250 km2. This complex is strictly linked with the formation of the Parana ́–Etendeka Igneous Province and the first stages of the South Atlantic Ocean rifting. The plutonic rocks range from quartz-monzonite to syenite, quartz-syenite and granite. The volcanic rocks and the dykes range from quartz-latite to trachyte and rhyolite; no substantial differences in term of chemical composition have been found between plutonic and volcanic rocks. Only a sample of basaltic composition (with tholeiitic affinity) has been sampled associated with the felsic rocks. The Agpaitic Index of the Valle Chico felsic rocks range from 0.72 to 1.34, with the peralkaline terms confined in the most evolved samples (SiO2N65 wt.%). Initial 87Sr/86Sr(130) of the felsic rocks range from 0.7046 to 0.7201, but the range of 87Sr/86Sr of low-Rb/Sr samples cluster at 0.7083; 143Nd/144Nd(130) ratios range from 0.5121 (syenite) to 0.5117 (granite). The tholeiitic basalt show more depleted isotopic compositions (87Sr/86Sr(130)=0.7061; 143Nd/144Nd(130)=0.5122), and plots in the field of other early Cretaceous low-Ti basaltic rocks of SE Uruguay. The radiogenic Sr and unradiogenic Nd of the Valle Chico felsic rocks require involvement of lower crustal material in their genesis either as melt contaminant or as protolith (crustal anatexis). In particular, most of the Valle Chico (VC) felsic rocks define a near-vertical array in Sr–Nd isotopic spaces, pointing toward classical EMI-type composition; this feature is considered to reflect a lower crust involvement as observed for other mafic and felsic rocks of the Parana ́–Etendeka Igneous Province. Decompression melting of the lower crust related to Gondwana continental rifting before the opening of the South Atlantic Ocean or the presence of thermal anomalies related to the Tristan plume may have induced the lower crust to ... |
author2 |
Lustrino, Michele Melluso, L. Brotzu, P. Gomes, G. B. Morbidelli, L. Muzio, R. Ruberti, E. Tassinari, C. C. G. |
format |
Article in Journal/Newspaper |
author |
LUSTRINO, Michele MELLUSO L. BROTZU P. GOMES G. B. MORBIDELLI L. MUZIO R. RUBERTI E. TASSINARI C. C. G. |
author_facet |
LUSTRINO, Michele MELLUSO L. BROTZU P. GOMES G. B. MORBIDELLI L. MUZIO R. RUBERTI E. TASSINARI C. C. G. |
author_sort |
LUSTRINO, Michele |
title |
Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
title_short |
Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
title_full |
Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
title_fullStr |
Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
title_full_unstemmed |
Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná-Etendeka magmatism |
title_sort |
petrogenesis of the early cretaceous valle chico igneous complex (se uruguay): relationships with paraná-etendeka magmatism |
publisher |
-Amsterdam Netherlands: Elsevier BV -Oslo : Universitetsforlaget |
publishDate |
2005 |
url |
http://hdl.handle.net/11573/37650 https://doi.org/10.1016/j.lithos.2004.07.004 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000229717600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-19044393445&partnerID=65&md5=1cb408adbfb57d1e1d5058ef7d39c4cf |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000229717600008 volume:82 firstpage:407 lastpage:434 journal:LITHOS http://hdl.handle.net/11573/37650 doi:10.1016/j.lithos.2004.07.004 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-19044393445 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000229717600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-19044393445&partnerID=65&md5=1cb408adbfb57d1e1d5058ef7d39c4cf |
op_doi |
https://doi.org/10.1016/j.lithos.2004.07.004 |
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Lithos |
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82 |
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3-4 |
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407 |
op_container_end_page |
434 |
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1796953570607628288 |