Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil

Detalhes bibliográficos
Autor(a) principal: CID, J. Plá
Data de Publicação: 2006
Outros Autores: RIOS, D.C., CONCEIÇÃO, H.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/6360
Resumo: RESTRITO
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spelling CID, J. PláRIOS, D.C.CONCEIÇÃO, H.CID, J. PláRIOS, D.C.CONCEIÇÃO, H.2012-07-06T14:18:17Z2012-07-06T14:18:17Z20060895-9811http://www.repositorio.ufba.br/ri/handle/ri/6360v.22, n.1-2RESTRITOMica-amphibole-lamprophyres, identified as vogesites, are associated with the Paleoproterozoic Morro do Afonso syenite intrusion in northeastern Brazil. The lamprophyres occur mainly as dykes that crosscut the syenitic rocks and occasionally as enclaves. Lamprophyric rocks are formed by the early magmatic paragenesis amphibole-clinopyroxene-apatite-phlogopite-ilmenite; feldspars are found in the groundmass. Near liquidus amphibole is edenite, close to the boundary with pargasite, which is enriched in alkalis relative to the other amphiboles (Mg-hornblende and actinolite). Clinopyroxene is diopside, and inclusions of phlogopite are analyzed in both clinopyroxene and amphibole phenocrysts. The chemical evolution of the mafic minerals is consistent with increasing oxygen fugacity during late magmatic stages. Whole-rock geochemical data suggest a metaluminous, ultrapotassic parental liquid, with silica saturation close to the limit of undersaturation. Trace element concentrations, such as enrichment in large ion lithophile and strong depletion of some high field-strength elements, indicate a mantle source that was partially modified by a subduction event. In this metasomatic mantle, it is important to emphasize the strong enrichment of light rare-earth elements, which is higher than those typically associated with basaltic rocks from active continental margins, and corresponding concentrations similar to those determined in lamproitic rocks. Major element modeling shows that fractional crystallization and magma flow segregation are the main petrogenetic processes involved in the magmatic evolution of lamprophyre magma, and it is possible to generate syenite magma by these mechanisms.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2012-07-06T14:18:17Z No. of bitstreams: 1 AA.pdf: 1219709 bytes, checksum: df2f59b470db4c62472f08d4456db884 (MD5)Made available in DSpace on 2012-07-06T14:18:17Z (GMT). No. of bitstreams: 1 AA.pdf: 1219709 bytes, checksum: df2f59b470db4c62472f08d4456db884 (MD5) Previous issue date: 2006SalvadorJournal of South American Earth Scienceshttp://dx.doi.org/10.1016/j.jsames.2006.08.002reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAMica-amphibole-lamprophyresVogesitesMineralogyUltrapotassic rocksPetrologyBrazilPetrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern BrazilJournal of South American Earth Sciencesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleenginfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/6360/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52ORIGINALAA.pdfAA.pdfapplication/pdf1219709https://repositorio.ufba.br/bitstream/ri/6360/1/AA.pdfdf2f59b470db4c62472f08d4456db884MD51TEXTAA.pdf.txtAA.pdf.txtExtracted texttext/plain82685https://repositorio.ufba.br/bitstream/ri/6360/3/AA.pdf.txtcf7f80a139d712dfba97c252bab645ceMD53ri/63602022-07-05 14:03:28.594oai:repositorio.ufba.br:ri/6360VGVybW8gZGUgTGljZW7vv71hLCBu77+9byBleGNsdXNpdm8sIHBhcmEgbyBkZXDvv71zaXRvIG5vIHJlcG9zaXTvv71yaW8gSW5zdGl0dWNpb25hbCBkYSBVRkJBCgogICAgUGVsbyBwcm9jZXNzbyBkZSBzdWJtaXNz77+9byBkZSBkb2N1bWVudG9zLCBvIGF1dG9yIG91IHNldQpyZXByZXNlbnRhbnRlIGxlZ2FsLCBhbyBhY2VpdGFyIGVzc2UgdGVybW8gZGUgbGljZW7vv71hLCBjb25jZWRlIGFvClJlcG9zaXTvv71yaW8gSW5zdGl0dWNpb25hbCBkYSBVbml2ZXJzaWRhZGUgRmVkZXJhbCBkYSBCYWhpYSBvIGRpcmVpdG8KZGUgbWFudGVyIHVtYSBj77+9cGlhIGVtIHNldSByZXBvc2l077+9cmlvIGNvbSBhIGZpbmFsaWRhZGUsIHByaW1laXJhLCAKZGUgcHJlc2VydmHvv73vv71vLiBFc3NlcyB0ZXJtb3MsIG7vv71vIGV4Y2x1c2l2b3MsIG1hbnTvv71tIG9zIGRpcmVpdG9zIGRlIAphdXRvci9jb3B5cmlnaHQsIG1hcyBlbnRlbmRlIG8gZG9jdW1lbnRvIGNvbW8gcGFydGUgZG8gYWNlcnZvIGludGVsZWN0dWFsIGRlc3NhIFVuaXZlcnNpZGFkZS4gCgogICAgUGFyYSBvcyBkb2N1bWVudG9zIHB1YmxpY2Fkb3MgY29tIHJlcGFzc2UgZGUgZGlyZWl0b3MgZGUgZGlzdHJpYnVp77+977+9bywgZXNzZSB0ZXJtbyBkZSBsaWNlbu+/vWEgZW50ZW5kZSBxdWU6IAoKICAgIE1hbnRlbmRvIG9zICBkaXJlaXRvcyBhdXRvcmFpcywgcmVwYXNzYWRvcyBhIHRlcmNlaXJvcywgZW0gY2FzbyAKZGUgcHVibGljYe+/ve+/vWVzLCBvIHJlcG9zaXTvv71yaW8gcG9kZSByZXN0cmluZ2lyIG8gYWNlc3NvIGFvIHRleHRvIAppbnRlZ3JhbCwgbWFzIGxpYmVyYSBhcyBpbmZvcm1h77+977+9ZXMgc29icmUgbyBkb2N1bWVudG8gKE1ldGFkYWRvcyBkZXNjcml0aXZvcykuCgogRGVzdGEgZm9ybWEsIGF0ZW5kZW5kbyBhb3MgYW5zZWlvcyBkZXNzYSB1bml2ZXJzaWRhZGUgCmVtIG1hbnRlciBzdWEgcHJvZHXvv73vv71vIGNpZW5077+9ZmljYSBjb20gYXMgcmVzdHJp77+977+9ZXMgaW1wb3N0YXMgcGVsb3MgCmVkaXRvcmVzIGRlIHBlcmnvv71kaWNvcy4gCgogICAgUGFyYSBhcyBwdWJsaWNh77+977+9ZXMgZW0gaW5pY2lhdGl2YXMgcXVlIHNlZ3VlbSBhIHBvbO+/vXRpY2EgZGUgCkFjZXNzbyBBYmVydG8sIG9zIGRlcO+/vXNpdG9zIGNvbXB1bHPvv71yaW9zIG5lc3NlIHJlcG9zaXTvv71yaW8gbWFudO+/vW0gCm9zIGRpcmVpdG9zIGF1dG9yYWlzLCBtYXMgbWFudO+/vW0gbyBhY2Vzc28gaXJyZXN0cml0byBhbyBtZXRhZGFkb3MgCmUgdGV4dG8gY29tcGxldG8uIEFzc2ltLCBhIGFjZWl0Ye+/ve+/vW8gZGVzc2UgdGVybW8gbu+/vW8gbmVjZXNzaXRhIGRlIApjb25zZW50aW1lbnRvIHBvciBwYXJ0ZSBkZSBhdXRvcmVzL2RldGVudG9yZXMgZG9zIGRpcmVpdG9zLCBwb3IgCmVzdGFyZW0gZW0gaW5pY2lhdGl2YXMgZGUgYWNlc3NvIGFiZXJ0by4KCiAgICBFbSBhbWJvcyBvIGNhc28sIGVzc2UgdGVybW8gZGUgbGljZW7vv71hLCBwb2RlIHNlciBhY2VpdG8gcGVsbyAKYXV0b3IsIGRldGVudG9yZXMgZGUgZGlyZWl0b3MgZS9vdSB0ZXJjZWlyb3MgYW1wYXJhZG9zIHBlbGEgCnVuaXZlcnNpZGFkZS4gRGV2aWRvIGFvcyBkaWZlcmVudGVzIHByb2Nlc3NvcyBwZWxvIHF1YWwgYSBzdWJtaXNz77+9byAKcG9kZSBvY29ycmVyLCBvIHJlcG9zaXTvv71yaW8gcGVybWl0ZSBhIGFjZWl0Ye+/ve+/vW8gZGEgbGljZW7vv71hIHBvciAKdGVyY2Vpcm9zLCBzb21lbnRlIG5vcyBjYXNvcyBkZSBkb2N1bWVudG9zIHByb2R1emlkb3MgcG9yIGludGVncmFudGVzIApkYSBVRkJBIGUgc3VibWV0aWRvcyBwb3IgcGVzc29hcyBhbXBhcmFkYXMgcG9yIGVzdGEgaW5zdGl0dWnvv73vv71vLgo=Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:28Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
dc.title.alternative.pt_BR.fl_str_mv Journal of South American Earth Sciences
title Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
spellingShingle Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
CID, J. Plá
Mica-amphibole-lamprophyres
Vogesites
Mineralogy
Ultrapotassic rocks
Petrology
Brazil
title_short Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
title_full Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
title_fullStr Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
title_full_unstemmed Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
title_sort Petrogenesis of mica-amphibole-bearing lamprophyres associated with the Paleoproterozoic Morro do Afonso syenite intrusion, eastern Brazil
author CID, J. Plá
author_facet CID, J. Plá
RIOS, D.C.
CONCEIÇÃO, H.
author_role author
author2 RIOS, D.C.
CONCEIÇÃO, H.
author2_role author
author
dc.contributor.author.fl_str_mv CID, J. Plá
RIOS, D.C.
CONCEIÇÃO, H.
CID, J. Plá
RIOS, D.C.
CONCEIÇÃO, H.
dc.subject.por.fl_str_mv Mica-amphibole-lamprophyres
Vogesites
Mineralogy
Ultrapotassic rocks
Petrology
Brazil
topic Mica-amphibole-lamprophyres
Vogesites
Mineralogy
Ultrapotassic rocks
Petrology
Brazil
description RESTRITO
publishDate 2006
dc.date.issued.fl_str_mv 2006
dc.date.accessioned.fl_str_mv 2012-07-06T14:18:17Z
dc.date.available.fl_str_mv 2012-07-06T14:18:17Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/6360
dc.identifier.issn.none.fl_str_mv 0895-9811
dc.identifier.number.pt_BR.fl_str_mv v.22, n.1-2
identifier_str_mv 0895-9811
v.22, n.1-2
url http://www.repositorio.ufba.br/ri/handle/ri/6360
dc.language.iso.fl_str_mv eng
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Journal of South American Earth Sciences
publisher.none.fl_str_mv Journal of South American Earth Sciences
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.jsames.2006.08.002
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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