Herbet Conceição

Universidade Federal de Sergipe

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Maria de Lourdes da Silva Rosa

Universidade Federal de Sergipe

Débora Correia Rios

Universidade Federal da Bahia

Moacir José Buenano Macambira

Universidade Federal do Pará

Moacyr Moura Marinho

Universidade Federal da Bahia

Joane Almeida da Conceição

Universidade Federal do Oeste da Bahia

Jailson Júnior Alves Santos

Universidade Federal da Bahia

J. Plá Cid

Instituto de Geociencias

Vinícius Anselmo Carvalho Lisboa

Instituto Federal de Educação Ciência e Tecnologia da Paraíba

Fábio Santos Pereira

University of Minho

Carlos Santana Sousa

Universidade Federal de Sergipe

Cooperative Institutions

Instituto de Geociencias

Universidade Federal de Sergipe

Universidade Federal da Bahia

Universidade Federal do Pará

Hospital Ana Nery

National Council for Scientific and Technological Development

Universidade Federal do Rio Grande do Sul

Serviço Geológico do Brasil - CPRM

Universidade de São Paulo

Instituto de Geocronología y Geología Isotópica

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Age, composition, and source of the Macururé Mafic Suite, Southern Borborema Province, Brazil

Brazilian Journal of Geology (2020)

Fábio Santos Pereira Maria de Lourdes da Silva Rosa Herbet Conceição Anelise Losangela Bertotti

The Capela, Dores, Aquidabã, Camará, Campo Grande, and Pedra Branca stocks constitute the Macururé Mafic Suite of the Sergipano Orogenic System, Southern Borborema Province.These bodies have elongated and tabular forms, which are concordant with the metasedimentary host rocks foliation.Most primitive terms are hornblendites, gabbros, and diorites, with minor monzonites, granodiorites, and granites.U-Pb SHRIMP zircon ages for Capela (631 ± 3 Ma), Aquidabã (636 ± 4 Ma) and Campo Grande (629 ± 9 Ma) stocks indicate the coeval emplacement of the intrusions.Geochemical data show that these rocks are metaluminous to slightly peraluminous, magnesian and have high-K calc-alkaline to shoshonitic affinities.Rare earth elements (REE) patterns are fractionated and multielement diagrams display depletions at Nb, Ta, and Ti, indicating subduction-related magmatism.Trace elements data suggest that the gabbros and diorites were generated by partial melting of an enriched subcontinental lithospheric mantle in the spinel stability field, which has probably been metasomatized by the interaction with sediments during previous subduction events.Field and petrographic evidence, associated with geochemical and geochronological data support that the magmas of the Macururé Mafic Suite were emplaced in early-to syn-collisional stage during the build-up of a continental arc in the Sergipano Orogenic System, at ca. 630 Ma.

10.1590/2317-4889202020190105

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Citations (16)

Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil

Precambrian Research (2006)

Débora Correia Rios Herbet Conceição Donald W. Davis J. Plá Cid Maria de Lourdes da Silva Rosa

Felsic

Lile

10.1016/j.precamres.2006.11.015

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Citations (46)

Neoproterozoic anorogenic magmatism in the Southern Bahia Alkaline Province of NE Brazil: U–Pb and Pb–Pb ages of the blue sodalite syenites

Lithos (2006)

Maria de Lourdes da Silva Rosa Herbet Conceição Moacir José Buenano Macambira M. A. Galarza Mônica Prisgsheim da Cunha

Nepheline syenite

Sodalite

Carbonatite

Nepheline

Pegmatite

Supercontinent

Batholith

Geochronology

10.1016/j.lithos.2006.12.011

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Citations (68)

The Itiúba alkaline syenite massif, Bahia State (Brazil): mineralogical, geochemical and petrological constraints—relation to the genesis of rapakivi magmatism

Precambrian Research (1991)

Herbet Conceição Pierre Sabaté Bernard Bonin

Massif

Country rock

10.1016/0301-9268(91)90105-j

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Citations (14)

The Santanápolis Syenite: Genesis and Evolution of Paleoproterozoic Shoshonitic Syenites in Northeastern Brazil

International Geology Review (2000)

Rômmulo Vieira Conceição Lauro Valentim Stoll Nardi Herbet Conceição

The Paleoproterozoic terrane of the state of Bahia, Brazil, is characterized by an important mag-matic event that resulted in the generation of large and numerous syenite complexes; the terrane constitutes one of the largest syenite provinces in the world. It includes the Itiuba (1,800km2), Santanápolis (180 km2), São Felix (32 km2), and Anuri (70 km2) complexes. These syenitic bodies of shoshonitic affiliation are silica saturated, metaluminous, and exhibit: (1) moderate to high K2O/Na2O ratios, (2) relatively high MgO contents (up to 3.0%); (3) high incompatible-element contents, particularly LILE and LREE; (4) high HREE/LREE fractionations; and (5) small Eu negative anomalies. Among these syenites, Santanápolis exhibits the greatest lithological diversity, with a porphyritic and a heterogranular facies, and diverse lithotypes that vary from leucosyenites to melanocratic syenites of cumulate origin, as well as enclaves and dikes. It intruded syntectonically at 2.1 Ga and shows magmatic flow structures and subsolidus recrystallization of quartz and alkali feldspars. The mineralogical assemblage is perthitic feldspar, diopside, hornblende, phlogopite-biotite, apatite, zircon, titanite, calcite, and monazite. Differentiation of the Santanópolis Syenite was controlled by flow segregation processes in an intermediate trachytic magma, with fractionation of early crystallized diopside, apatite, and plagioclase. The parental intermediate shoshonitic magma was extracted directly from an enriched, subduction-modified mantle characterized by anomalous concentrations of LREE and LILE elements, and isotopic parameters similar to the EMI-type.

Lile

Porphyritic

Trachyte

10.1080/00206810009465119

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Citations (13)

Idade (Pb-Pb) e aspectos petrográficos e litogeoquímicos do Complexo Alcalino Floresta Azul, Sul do Estado da Bahia

Brazilian Journal of Geology (2003)

Maria de Lourdes da Silva Rosa Herbet Conceição Moacir José Buenano Macambira Moacyr Moura Marinho Leila Soares Marques

Pb-Pb AGE AND PETROGRAPHIC AND LITHOGEOCHEMICAL ASPECTS OF THE FLORESTA AZUL ALKALINE COMPLEX, SOUTHERN STATE BAHIA The Floresta Azul Alkaline Complex (CAFA), is represented by a NE-SW elongated igneous body, with an exposed area of 200 km 2 , located in the central-northern region of the Southern Bahia State Alkaline Province. Two types of magmatic intrusion were recognized: (i) at the eastern part of complex, occur granitic rocks, presenting many dior itic inclusions, and (ii) the syenitic rocks are located in the western region. Pb-Pb ages obtained in single zircon crystals from g ranite (696 ± 11 Ma); diorite (688 ± 2 Ma) and syenite (688 ± 10 Ma) indicate that CAFA rocks were emplaced synchronously during a Neoproterozoic event. The main mafic mineral of the CAFA is biotite, whereas sodic amphibole and aegirine are sporadically foun d in the granitic and syenitic lithotypes. The textural features of these rocks, typified by the angular distribution of well-for med feldspar crystals, reflect the lack of significant deformation after crystallization. All the lithologic types from the complex have alk aline signature, characterized by the high contents of Nb (86-243 ppm), Y (22-43ppm), F (760-2600) and Cl (220-10.000). The distribut ion patterns of minor and trace elements suggest that the different rocks from CAFA are cogenetic.

Diorite

Actinolite

Amphibole

10.5327/rbg.v33i1.1014

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Citations (12)

GEOQUÍMICA E GEOCRONOLOGIA DE GRANITOS ANOROGÊNICOS TONIANOS (ca. 914–899 Ma) DA FAIXA ARAÇUAÍ NO SUL DO ESTADO DA BAHIA

Revista Geonomos (2012)

Rita da Cunha Leal Menezes Herbet Conceição Maria de Lourdes da Silva Rosa Moacir José Buenano Macambira Marco Antônio Galarza

Na região sul da Bahia, entre Itarantim e Potiraguá, identificou-se a ocorrência de cinco stocks elipsoidais de granito, alinhados na direção E-W, que são intrusivos no Complexo Itapetinga. Estes stocks são constituídos por biotita-hornblenda granito com termos sieníticos subordinados. Os granitos são metaluminosos a peraluminosos e têm atributos geoquímicos característicos de intrusões anorogênicas do tipo A1, tais como conteúdos de álcalis similares, altos valores de SiO2, Nb, Y, Ta, Th e Terras Raras Leves, baixos valores de CaO, Sr e Ba, e alta razão FeO*/MgO. Essas características são indicativas de magma riolítico com importante contribuição mantélica. Análises isotópicas Pb-Pb por evaporação de monocristais de zircão forneceram as idades de 914 ± 3 Ma (Bolívia), 911 ± 2 Ma (Irmão César), 907 ± 2 Ma (Jundiá), 905 ± 4 Ma (Monte Alto) e 899 ± 3 Ma (Serras) para os stocks estudados. Destaca-se que este magmatismo anorogênico do Toniano é cerca de 200 milhões de anos mais antigo do que a Província Alcalina do Sul do Estado da Bahia, originada no Criogeniano (730-690 Ma). Os dados aqui apresentados tornam ainda mais consistente o modelo de rifte, proposto na literatura, para explicar a presença deste tipo de magmatismo do Toniano, na extremidade nordeste da Faixa Araçuaí.Palavras-Chave: granito tipo A, Toniano, Faixa Araçuaí, Bahia ABSTRACT: GEOCHEMISTRY AND GEOCHRONOLOGY OF TONIAN (ca. 914-899 Ma) ANOROGENIC GRANITES OF THE ARAÇUAÍ BELT, SOUTHERN BAHIA STATE, BRAZIL. Five ellipsoidal granitic stocks form intrusions aligned in the E-W direction and hosted by the Itapetinga Complex in the Itarantim–Potiraguá region, southern Bahia State. These stocks mainly consist of biotite-hornblende granite and minor syenitic rocks. The granitic rocks are metaluminous to peraluminous and show geochemical attributes of A1 type granites, such as similar contents of alkaline elements, and high SiO2, Nb, Y, Ta, Th and Light Rare Earth Elements, as well as low CaO, Sr and Ba, and high FeO*/MgO ratios, that suggest rhyolitic magma with important mantle contribution. Single zircon Pb-Pb isotopic analysis yielded the ages of 914 ± 3 Ma (Bolívia), 911 ± 2 Ma (Irmão César), 907± 2 Ma (Jundiá), 905 ± 4 Ma (Monte Alto) and 899 ± 3 Ma (Serras) for the studied stocks. This magmatic episode is ca. 200 Ma older than the South Bahia Alkaline Province, formed in Cryogenian time (730-690 Ma). The presented data reinforce the rift model suggested in the literature to explain the Tonian A-type magmatism in the northeastern tip of the Araçuaí Belt.Keywords: A-type granite, Tonian, Araçuaí Belt, Bahia.

10.18285/geonomos.v20i1.21

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Citations (15)

Petrologia dos Stocks Santa Maria, Monte Pedral, Bom Jardim, Boa Esperança e Niterói, Suíte Intrusiva Serra do Catu, Estado de Sergipe, NE Brasil

Geologia USP Série Científica (2019)

Hiakan Santos Soares Carlos Santana Sousa Maria de Lourdes da Silva Rosa Herbet Conceição

Os Stocks Monte Pedral, Boa Esperança, Santa Maria, Niterói e Bom Jardim situam-se na parte Norte do Sistema Orogênico Sergipano. Esses cinco corpos são constituídos por: álcali-feldspato sienito e quartzo álcali-feldspato sienito (Monte Pedral); quartzo álcali-feldspato sienito e álcali-feldspato granito (Boa Esperança); granito (Santa Maria); monzogranito, quartzo monzonito e quartzo monzodiorito (Niterói); granito, quartzo monzonito, granodiorito, quartzo monzodiorito e diorito (Bom Jardim). Essas rochas são porfiríticas, com megacristais de feldspato alcalino rico em zoneamentos oscilatórios. A ocorrência de megacristais de feldspato alcalino com zoneamento composicional bem marcado e enclaves máficos é uma feição que distingue esse magmatismo daqueles de outras suítes intrusivas do Domínio Canindé. Os Stocks Monte Pedral e Boa Esperança correspondem a um magmatismo hipersolvus, enquanto os demais Stocks (Bom Jardim, Niterói e Santa Maria) representam magmatismo subsolvus. A idade U-PbShrimp de 611 ± 4 Ma obtida para o Stock Santa Maria permite correlacioná-lo ao plutonismo shoshonítico mais antigo no Sul da Província Borborema. A mica marrom nas rochas corresponde à biotita e flogopita e indica afinidade orogênica para este plutonismo. A Mg-hornblenda e a tschermakita são os anfibólios primários nestas rochas, os quais cristalizaram-se em condições oxidantes e em profundidades que variam de 12 (3 kbar) a 26 (7 kbar) km. Dados geoquímicos revelam que os magmas responsáveis por formarem os stocks estudados pertencem a suítes shoshoníticas e evoluem por cristalização fracionada, tendo contribuição de material mantélico, além de exibirem assinatura geoquímica (enriquecimento em Elementos Terras Raras Leves), em relação aos pesados, e anomalias negativas em Ta, Nb, P, Sr e Eu, características de magmas associados à subducção.

10.11606/issn.2316-9095.v19-156598

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Citations (6)

Amphibole crystallization conditions as record of interaction between ultrapotassic enclaves and monzonitic magmas in the Glória Norte Stock, South of Borborema Province

Brazilian Journal of Geology (2020)

Vinícius Anselmo Carvalho Lisboa Herbet Conceição Maria de Lourdes da Silva Rosa Gisele Tavares Marques Cláudio Nery Lamarão

The Glória Norte Stock (GNS) is made up of predominantly porphyritic biotite- amphibole-bearing quartz monzonite, enclosing a large number of microgranular mafic enclaves (MME). The GNS MME are fine-grained rocks with rounded and ellipsoid shapes that show sharp and gradational contacts with the host rocks, suggesting they coexisted with the host monzonite as magmas. The studied amphibole crystals of the two rock types are calcic and correspond to pargasite, edenite, and magnesium-hornblende. Their compositions are influenced by substitutions involving Al3+, Na+, Fe2+, Si4+ and Mg2+ ions, reflecting the decrease in temperature and the increase in oxygen fugacity. They present low Ti and Al contents, and varied Si content (6.2-7.7 apuf). The mg# values range from 0.48-0.84. Pressures for the crystallization of the MME amphiboles vary between 2.6 and 7.8 kbar and the temperatures of solidus and liquidus were estimated between 600-659 and 887-908ºC, respectively. The early MME amphibole crystals with lower Si and Mg content were formed under high pressure (7.8 kbar) and temperature (908 °C). The presence of amphiboles with 862ºC and 5 kbar in MME and GNS reflects that the interaction between these magmas occurred at 18 km of depth.

Amphibole

Quartz monzonite

Mineral redox buffer

Ilmenite

Fractional crystallization (geology)

10.1590/2317-4889202020190101

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Citations (5)

Amphibole Crystallization as a Tool for Monitoring Complex Mixing between Basaltic and Latitic Magmas: The Fazenda Lagoas Monzonitic Stock, Borborema Province, Brazil

Diego Melo Fernandes Hiakan Santos Soares Carlos Santana Sousa Asayuki Rodrigues Menezes Fábio Santos Pereira

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Amphibole

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Fractional crystallization (geology)

Stock (firearms)

10.2139/ssrn.4798578

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