Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/7413 |
Resumo: | The relationship between oxygen isotopic values and magnetic susceptibility composition on 11 Variscan Portuguese granites has been investigated. Whole-rock oxygen-isotope (18O ) values for Vieira do Minho (VM), Vila Pouca de Aguiar (VPA), Chaves, Castelo Branco (CB), Manteigas and Serra da Estrela (SE) granitoids, were compilated from bibliography [1,2,3,4], and 18O for Santa Eulalia Plutonic Complex (SEPC) were obtained by laser fluorination at the Stable Isotopic Laboratory of Salamanca. Magnetic susceptibility (Km) values were obtained with a Kappabridge equipment from Toulouse University and Geology Centre, Porto University [2,5,6,7,8]. In this study is shown that there is a significant inverse correlation between Km and 18O. Magnetite-type granites (Manteigas granodiorite and SEPC external facies) have Km>10-3 SI and low 18O values ranging from 8.9 to 10.3 0/00 instead those of ilmenite-type (all the other granites) have Km 10-4 SI and are 18O enriched (9.3 to 13.5 0/00). The I-type granites (VM, VPA, Chaves, Manteigas and SEPC external facies) show lower average 18O (10.2 0/00) and higher Km values (100x10-6 SI) than the S-type granites (SE and CB) with 18O = 12.6 0/00 and Km = 65x10-6 SI. Figure 1: Semi-log plot of Km (in Si units) versus 18O. This work has been financially supported by PTDC/CTEGIX/ 099447/2008 (FCT-Portugal, COMPETE/FEDER). [1] Martins et al. (in prep.) [2] Martins et al. (2009) Lithos 111, 142-155. [3] Antunes et al. (2008) Lithos 103, 445-465. [4] Neiva et al. (2009) Lithos 111, 186-202. [5] Sant’Ovaia et al. (2010) JSG 32, 1450-1465. [6] Sant’Ovaia et al. (2000) TRSE, ES 91, 123-127. [7] Sant’Ovaia et al. (2008) 33rd IGC CD. [8] Sant’Ovaia et al. (2011) Min. Mag. 75, 3, 1795. |
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Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massifgranitic rocksmagnetic susceptibilityoxygen isotopesiberian massifThe relationship between oxygen isotopic values and magnetic susceptibility composition on 11 Variscan Portuguese granites has been investigated. Whole-rock oxygen-isotope (18O ) values for Vieira do Minho (VM), Vila Pouca de Aguiar (VPA), Chaves, Castelo Branco (CB), Manteigas and Serra da Estrela (SE) granitoids, were compilated from bibliography [1,2,3,4], and 18O for Santa Eulalia Plutonic Complex (SEPC) were obtained by laser fluorination at the Stable Isotopic Laboratory of Salamanca. Magnetic susceptibility (Km) values were obtained with a Kappabridge equipment from Toulouse University and Geology Centre, Porto University [2,5,6,7,8]. In this study is shown that there is a significant inverse correlation between Km and 18O. Magnetite-type granites (Manteigas granodiorite and SEPC external facies) have Km>10-3 SI and low 18O values ranging from 8.9 to 10.3 0/00 instead those of ilmenite-type (all the other granites) have Km 10-4 SI and are 18O enriched (9.3 to 13.5 0/00). The I-type granites (VM, VPA, Chaves, Manteigas and SEPC external facies) show lower average 18O (10.2 0/00) and higher Km values (100x10-6 SI) than the S-type granites (SE and CB) with 18O = 12.6 0/00 and Km = 65x10-6 SI. Figure 1: Semi-log plot of Km (in Si units) versus 18O. This work has been financially supported by PTDC/CTEGIX/ 099447/2008 (FCT-Portugal, COMPETE/FEDER). [1] Martins et al. (in prep.) [2] Martins et al. (2009) Lithos 111, 142-155. [3] Antunes et al. (2008) Lithos 103, 445-465. [4] Neiva et al. (2009) Lithos 111, 186-202. [5] Sant’Ovaia et al. (2010) JSG 32, 1450-1465. [6] Sant’Ovaia et al. (2000) TRSE, ES 91, 123-127. [7] Sant’Ovaia et al. (2008) 33rd IGC CD. [8] Sant’Ovaia et al. (2011) Min. Mag. 75, 3, 1795.Mineralogical Society2013-01-17T17:21:29Z2013-01-172012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/7413http://hdl.handle.net/10174/7413engSant’Ovaia, H., Martins, H., Lopes, J.C., Machado, J., Noronha, F. (2012) Correlation of magnetic susceptibility with δ18O data in magnetite- and ilmenite-type granites from Iberian massif. Mineralogical Magazine, 76 (6), p. 2325naonaosimhsantov@fc.up.ptndcarrilho@uevora.ptndnd247Sant'Ovaia, HelenaMartins, HelenaLopes, José CarrilhoMachado, JoanaNoronha, Fernandoinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:47:06Zoai:dspace.uevora.pt:10174/7413Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:01:44.324476Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
title |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
spellingShingle |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif Sant'Ovaia, Helena granitic rocks magnetic susceptibility oxygen isotopes iberian massif |
title_short |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
title_full |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
title_fullStr |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
title_full_unstemmed |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
title_sort |
Correlation of magnetic susceptibility with 18O data in magnetite- and ilmenite-type granites from Iberian massif |
author |
Sant'Ovaia, Helena |
author_facet |
Sant'Ovaia, Helena Martins, Helena Lopes, José Carrilho Machado, Joana Noronha, Fernando |
author_role |
author |
author2 |
Martins, Helena Lopes, José Carrilho Machado, Joana Noronha, Fernando |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Sant'Ovaia, Helena Martins, Helena Lopes, José Carrilho Machado, Joana Noronha, Fernando |
dc.subject.por.fl_str_mv |
granitic rocks magnetic susceptibility oxygen isotopes iberian massif |
topic |
granitic rocks magnetic susceptibility oxygen isotopes iberian massif |
description |
The relationship between oxygen isotopic values and magnetic susceptibility composition on 11 Variscan Portuguese granites has been investigated. Whole-rock oxygen-isotope (18O ) values for Vieira do Minho (VM), Vila Pouca de Aguiar (VPA), Chaves, Castelo Branco (CB), Manteigas and Serra da Estrela (SE) granitoids, were compilated from bibliography [1,2,3,4], and 18O for Santa Eulalia Plutonic Complex (SEPC) were obtained by laser fluorination at the Stable Isotopic Laboratory of Salamanca. Magnetic susceptibility (Km) values were obtained with a Kappabridge equipment from Toulouse University and Geology Centre, Porto University [2,5,6,7,8]. In this study is shown that there is a significant inverse correlation between Km and 18O. Magnetite-type granites (Manteigas granodiorite and SEPC external facies) have Km>10-3 SI and low 18O values ranging from 8.9 to 10.3 0/00 instead those of ilmenite-type (all the other granites) have Km 10-4 SI and are 18O enriched (9.3 to 13.5 0/00). The I-type granites (VM, VPA, Chaves, Manteigas and SEPC external facies) show lower average 18O (10.2 0/00) and higher Km values (100x10-6 SI) than the S-type granites (SE and CB) with 18O = 12.6 0/00 and Km = 65x10-6 SI. Figure 1: Semi-log plot of Km (in Si units) versus 18O. This work has been financially supported by PTDC/CTEGIX/ 099447/2008 (FCT-Portugal, COMPETE/FEDER). [1] Martins et al. (in prep.) [2] Martins et al. (2009) Lithos 111, 142-155. [3] Antunes et al. (2008) Lithos 103, 445-465. [4] Neiva et al. (2009) Lithos 111, 186-202. [5] Sant’Ovaia et al. (2010) JSG 32, 1450-1465. [6] Sant’Ovaia et al. (2000) TRSE, ES 91, 123-127. [7] Sant’Ovaia et al. (2008) 33rd IGC CD. [8] Sant’Ovaia et al. (2011) Min. Mag. 75, 3, 1795. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-01-01T00:00:00Z 2013-01-17T17:21:29Z 2013-01-17 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/7413 http://hdl.handle.net/10174/7413 |
url |
http://hdl.handle.net/10174/7413 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Sant’Ovaia, H., Martins, H., Lopes, J.C., Machado, J., Noronha, F. (2012) Correlation of magnetic susceptibility with δ18O data in magnetite- and ilmenite-type granites from Iberian massif. Mineralogical Magazine, 76 (6), p. 2325 nao nao sim hsantov@fc.up.pt nd carrilho@uevora.pt nd nd 247 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Mineralogical Society |
publisher.none.fl_str_mv |
Mineralogical Society |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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