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dc.contributor.authorHartmann, L.
dc.contributor.authorSantos, J.
dc.contributor.authorLeite, J.
dc.contributor.authorPorcher, C.
dc.contributor.authorMcNaughton, Neal
dc.date.accessioned2017-01-30T12:13:35Z
dc.date.available2017-01-30T12:13:35Z
dc.date.created2010-04-25T20:02:39Z
dc.date.issued2003
dc.identifier.citationHartmann, Leo and Santos, Joao and Leite, Jayme and Porcher, Carla and McNaughton, Neal. 2003. Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizario ultramafic amphibolite, Encantadas Complex, southernmost Brazil. Anais da Academia Beasileira de Ciencias. 75 (3): pp. 393-403.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/19378
dc.description.abstract

The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizario ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex. Magmatic evidence of the magnesian basalt or pyroxenite protolith is only preserved in cores of zircon crystals, which are dated at 2257 ± 12 Ma. Amphibolite facies metamorphism M1 formed voluminous hornblende in the investigated rock possibly at 1989 ± 21 Ma. This ultramafic rock was re-metamorphosed at 702 ± 21 Ma during a greenschist facies event M2; the assemblage actinolite + oligoclase + microcline + epidote + titanite + monazite formed by alteration of hornblende. The metamorphic events are probably related to the Encantadas Orogeny (2257 ± 12 Ma) and Camboriu Orogeny (~ 1989 Ma) of the Trans-Amazonian Cycle, followed by an orogenic event (702 ± 21 Ma) of the Brasiliano Cycle. The intervening cratonic period (2000-700 Ma) corresponds to the existence of the Supercontinent Atlantica, known regionally as the Rio de la Plata Craton.

dc.publisherAcademia Brasileira de Ciencias
dc.subjectTrans-Amazonian Cycle
dc.subjectEncantadas Complex
dc.subjectultramafic amphibolite
dc.subjectzircon geochronology
dc.subject- metamorphism
dc.titleMetamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizario ultramafic amphibolite, Encantadas Complex, southernmost Brazil.
dc.typeJournal Article
dcterms.source.volume75
dcterms.source.startPage393
dcterms.source.endPage403
dcterms.source.issn0001-3765
dcterms.source.titleAnais da Academia Beasileira de Ciencias
curtin.note

The english title of this journal is Annals of the Brazilian Academy of Sciences

curtin.departmentJohn de Laeter Centre for Mass Spectrometry (COE)
curtin.accessStatusOpen access
curtin.facultyScience and Engineering


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