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metadata.dc.type: Artigo de Periódico
Issue Date: Sep-2018
metadata.dc.creator: MACAMBIRA, Moacir José Buenano
SOUSA, Maria Zélia Aguiar de
RUIZ, Amarildo Salina
BATATA, Maria Elisa Fróes
metadata.dc.description.affiliation: LIMA, G. A; MACAMBIRA, M. J. B. Universidade Federal do Pará
Title: Geology and petrology of the Salto do Céu Suite: tectonic and stratigraphic implications on the SW Amazonian Craton
metadata.dc.description.sponsorship: PETROBRAS
Citation: MACAMBIRA, Moacir José Buenano et al. Geology and petrology of the Salto do Céu Suite: tectonic and stratigraphic implications on the SW Amazonian Craton. Brazilian Journal of Geology, São Paulo, v. 48, n. 3, p. 603- 622, jul./set. 2018. DOI: Disponível em: Acesso em:.
Abstract: The basic rocks of the Salto do Céu Suite outcrop as sills and flows in the southwestern Amazon Craton, Rondonian-San Ignacio Province, with an age of about 1.44 Ga. Sills are 2 to 30 m thick being hosted by pelites of the Aguapei Group. The flows are up to 5 m thick and cover this unit. Typical textures of magma mingling are observed near the contact with granites of Rio Branco Suite. The Rio Branco Intrusive Suite is composed of basic and acid rocks, as well as hybrid rocks that indicate mixing processes between basic and acids magmas. U-Pb (TIMS zircon) results indicate ages around 1.4 Ga for both terms. The Salto do Céu Suite rocks have tholeiites affinity classified as subalkaline and iron-rich tholeiitic basalts, with mg# values between 0.30 and 0.51. They can be separated into two groups, based on La N ; one is richer in ETR with La N greater than 100, while the other one has La N less than 100. Rocks of the Salto do Céu Suite and Rio Branco Suite are interpreted as a bimodal suites showing magma mingling features such as those developed in continental intraplate settings, extensional regime associated to the Columbia/Nuna breakup.
Keywords: Mafic flows and sills
Extensional tectonics
Amazonian Craton
Series/Report no.: Brazilian Journal of Geology
ISSN: 2317-4692 Brasil
Publisher: Sociedade Brasileira de Geologia
metadata.dc.publisher.initials: SBG
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - IG

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