The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork
The Early Cretaceous Barra do Itapirapuã carbonatite, in southern Brazil, belongs to the initial stages of the alkaline carbonatitic magmatism in the Ponta Grossa Arch Province, as related to the opening of the south Atlantic Ocean. The magmatic evolution of the complex comprises four phases of intr...
Published in: | Journal of South American Earth Sciences |
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Elsevier Science
2002
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Online Access: | http://hdl.handle.net/11573/254991 https://doi.org/10.1016/S0895-9811(02)00031-7 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000177045900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074388&partnerID=65&md5=af8152814e0175f9234cf071790f83cd |
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ftunivromairis:oai:iris.uniroma1.it:11573/254991 2024-02-04T10:04:32+01:00 The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork E. RUBERTI P. CENSI P. COMIN CHIARAMONTI C. B. GOMES P. ANTONINI F. D. R. ANDRADE CASTORINA, Francesca E., Ruberti Castorina, Francesca P., Censi P., COMIN CHIARAMONTI C. B., Gome P., Antonini F. D. R., Andrade 2002 STAMPA http://hdl.handle.net/11573/254991 https://doi.org/10.1016/S0895-9811(02)00031-7 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000177045900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074388&partnerID=65&md5=af8152814e0175f9234cf071790f83cd eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/wos/WOS:000177045900005 volume:15 issue:2 firstpage:215 lastpage:228 numberofpages:14 journal:JOURNAL OF SOUTH AMERICAN EARTH SCIENCES http://hdl.handle.net/11573/254991 doi:10.1016/S0895-9811(02)00031-7 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036074388 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000177045900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074388&partnerID=65&md5=af8152814e0175f9234cf071790f83cd Fenitization Carbonatite Syenite info:eu-repo/semantics/article 2002 ftunivromairis https://doi.org/10.1016/S0895-9811(02)00031-7 2024-01-10T18:21:17Z The Early Cretaceous Barra do Itapirapuã carbonatite, in southern Brazil, belongs to the initial stages of the alkaline carbonatitic magmatism in the Ponta Grossa Arch Province, as related to the opening of the south Atlantic Ocean. The magmatic evolution of the complex comprises four phases of intrusive carbonatite that are composed of medium- to coarse-grained Mg and Fe carbonatites with small volumes of late fine- to very fine-grained Mg carbonatites and show evidence of pervasive hydrothermal events. Drill core samples reveal the existence of silicate rocks of syenitic composition of two different origins. Among the silicate rocks, there are syenites of a likely magmatic origin, as well as fenites derived from the granitic protolith, which constitutes the wall rock of the complex. Fenitization around the Barra do Itapirapuã complex is mainly potassic, and fenites are Ca- and LOI-enriched in comparison with the magmatic syenites. Furthermore, the two types of silicate rocks differ in terms of REE and other trace elements. Associated syenites and carbonatites have similar Sr–Nd isotopic compositions, close to the Bulk Earth at 120Ma. Mixing curves indicate that the carbonatite–syenite association may be accounted for by assimilation of up to 20% crustal material, whereas the late carbonatite composition is consistent with less than 10% assimilation of crustal rocks. An origin by liquid immiscibility for the carbonatite–syenite association can be considered, followed by magmatic differentiation through fractional crystallization of calcite and dolomite in the carbonatite magma. C–O stable isotopic data indicate further reequilibration under hydrothermal conditions at temperatures between 375 and 80°C. Article in Journal/Newspaper South Atlantic Ocean Sapienza Università di Roma: CINECA IRIS Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Journal of South American Earth Sciences 15 2 215 228 |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
Fenitization Carbonatite Syenite |
spellingShingle |
Fenitization Carbonatite Syenite E. RUBERTI P. CENSI P. COMIN CHIARAMONTI C. B. GOMES P. ANTONINI F. D. R. ANDRADE CASTORINA, Francesca The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
topic_facet |
Fenitization Carbonatite Syenite |
description |
The Early Cretaceous Barra do Itapirapuã carbonatite, in southern Brazil, belongs to the initial stages of the alkaline carbonatitic magmatism in the Ponta Grossa Arch Province, as related to the opening of the south Atlantic Ocean. The magmatic evolution of the complex comprises four phases of intrusive carbonatite that are composed of medium- to coarse-grained Mg and Fe carbonatites with small volumes of late fine- to very fine-grained Mg carbonatites and show evidence of pervasive hydrothermal events. Drill core samples reveal the existence of silicate rocks of syenitic composition of two different origins. Among the silicate rocks, there are syenites of a likely magmatic origin, as well as fenites derived from the granitic protolith, which constitutes the wall rock of the complex. Fenitization around the Barra do Itapirapuã complex is mainly potassic, and fenites are Ca- and LOI-enriched in comparison with the magmatic syenites. Furthermore, the two types of silicate rocks differ in terms of REE and other trace elements. Associated syenites and carbonatites have similar Sr–Nd isotopic compositions, close to the Bulk Earth at 120Ma. Mixing curves indicate that the carbonatite–syenite association may be accounted for by assimilation of up to 20% crustal material, whereas the late carbonatite composition is consistent with less than 10% assimilation of crustal rocks. An origin by liquid immiscibility for the carbonatite–syenite association can be considered, followed by magmatic differentiation through fractional crystallization of calcite and dolomite in the carbonatite magma. C–O stable isotopic data indicate further reequilibration under hydrothermal conditions at temperatures between 375 and 80°C. |
author2 |
E., Ruberti Castorina, Francesca P., Censi P., COMIN CHIARAMONTI C. B., Gome P., Antonini F. D. R., Andrade |
format |
Article in Journal/Newspaper |
author |
E. RUBERTI P. CENSI P. COMIN CHIARAMONTI C. B. GOMES P. ANTONINI F. D. R. ANDRADE CASTORINA, Francesca |
author_facet |
E. RUBERTI P. CENSI P. COMIN CHIARAMONTI C. B. GOMES P. ANTONINI F. D. R. ANDRADE CASTORINA, Francesca |
author_sort |
E. RUBERTI |
title |
The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
title_short |
The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
title_full |
The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
title_fullStr |
The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
title_full_unstemmed |
The geochemistry of the Barra do Itapirapuã carbonatite (Ponta Grossa Arch, Brazil): a multiple stockwork |
title_sort |
geochemistry of the barra do itapirapuã carbonatite (ponta grossa arch, brazil): a multiple stockwork |
publisher |
Elsevier Science |
publishDate |
2002 |
url |
http://hdl.handle.net/11573/254991 https://doi.org/10.1016/S0895-9811(02)00031-7 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000177045900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074388&partnerID=65&md5=af8152814e0175f9234cf071790f83cd |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Barra |
geographic_facet |
Barra |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000177045900005 volume:15 issue:2 firstpage:215 lastpage:228 numberofpages:14 journal:JOURNAL OF SOUTH AMERICAN EARTH SCIENCES http://hdl.handle.net/11573/254991 doi:10.1016/S0895-9811(02)00031-7 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036074388 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000177045900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074388&partnerID=65&md5=af8152814e0175f9234cf071790f83cd |
op_doi |
https://doi.org/10.1016/S0895-9811(02)00031-7 |
container_title |
Journal of South American Earth Sciences |
container_volume |
15 |
container_issue |
2 |
container_start_page |
215 |
op_container_end_page |
228 |
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