Alcídes N. Sial

Universidade Federal de Pernambuco

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Valderez P. Ferreira

Universidade Federal de Pernambuco

140

Claudio Gaucher

Universidad de la República

Márcio Martins Pimentel

Universidade de Brasília

Natan Silva Pereira

Universidade do Estado da Bahia

Luiz Drude de Lacerda

Universidade Federal de Juiz de Fora

Robert Frei

University of Copenhagen

Anil Maheshwari

Shriram Institute for Industrial Research

Alejandro J. Toselli

National University of Tucumán

Cláudio Riccomini

Universidade de São Paulo

Manoj K. Pandit

University of Rajasthan

Cooperative Institutions

Instituto de Geociencias

107

Universidade Federal de Pernambuco

Universidade de São Paulo

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional de La Plata

Universidade Federal de Minas Gerais

Universidade de Brasília

National Council for Scientific and Technological Development

Centro Científico Tecnológico - Tucumán

Universidade Federal do Pará

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Ancient Coastlines in the Continental Shelf of the State of Ceará, Northeast Brazil: Evidence from Sediment Chemistry and Stable Isotopes

International Geology Review (2008)

Wanessa Sousa Marques Alcídes N. Sial Eldemar de Albuquerque Menor Valderez P. Ferreira George Satander Sá Freire

Continental shelf sediments from the state of Ceará, northeastern Brazil, have been studied to investigate meteoric diagenesis of marine sediments of previously defined ancient coastal lines. Major elements for 131 samples of carbonate sediments and C and O isotopes for 51 carapace samples of benthonic foraminifers of the Amphistegina radiata and Peneroplis planatus species were analyzed. Geochemical signatures of δ13C, δ18O, SiO2 (stoichiometrically calculated as quartz %), Sr and Mn, and XRD document the impact of meteoric diagenesis on relict sediments from current depths of 25-30 m, 45 m, and 80 m. Morphologies of the marine shelf at these depths, interpreted from previous bathymetric profiles, correspond to holocenic marine terraces. Despite a recent sedimentary cover, it was possible to confirm that these terraces possess relict detrital, biogenic, and continental material, that resulted from erosional reworking of ancient coastlines during the Flandrian transgression.

Continental Margin

δ18O

10.2747/0020-6814.50.12.1141

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Citations (3)

Petrography and stable isotope geochemistry of the cretaceous El Abra Limestones (Actopan), Mexico: Implication on diagenesis

Journal of the Geological Society of India (2011)

John S. Armstrong‐Altrin Jayagopal Madhavaraju Alcídes N. Sial Juan José Kasper‐Zubillaga R. Nagarajan

Isotope Geochemistry

10.1007/s12594-011-0042-3

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Citations (53)

EPIDOTE-BEARING CALC-ALKALIC GRANITOIDS IN NORTHEAST BRAZIL

Revista Brasileira de Geociências (1990)

Alcídes N. Sial

grande número de granitóides cálcio-alcalinos com epidoto são encontrados no Domínio Estrutural Central (DEC) -que compreende três segmentos: Seridó, Cachoeirinha-Salgueiro e Riacho do Pontal -e em algumas outras localidades no Nordeste do

10.25249/0375-7536.199088100

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Citations (18)

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Geophysical monograph (2018)

Alcídes N. Sial Claudio Gaucher Muthuvairavasamy Ramkumar Valderez P. Ferreira

and major geologic events of, 92f Marinoan cap carbonate in southern cap carbonate, 98-102, 98f, 100f cap dolostone, 99-101, 100f cap limestone cementstone, 101-2 Marinoan glacial deposits, 93-94, 95f, 96f paleobiology of, 102-4, 103f, 105f paleogeographic map for, 74f representative fossils of, 103f simplified stratigraphic section of glacial deposits with, 96f Ammonoids, 166 Angara Craton, 74f Anomaly, 29 Anticosti Island, 147f Apennines, 186f Araras Group acritarch specimens in, 104 carbon isotope chemostratigraphy for, 105f insertion of post-Marinoan carbonates of, 106f lithostratigraphy of, 105f microbial laminites in, 103 Aravalli-Bundelkhand Craton, 54-55, 54f, 59-60 Archean-Proterozoic boundary banded iron formation in, 35 BIF with, 42f chromium isotopes in, 39-40, 39f global change from, 35 Great Oxidation Event with, 9, 35-43, 36f, 38f, 39f, 41f, 42f molybdenum isotopes in, 40-41, 41f placement of, 42-43, 42f present atmospheric level exceeded by, 35, 37, 40-43 sulfur isotopes in, 36-38, 38f Arequipa Massif, 74f Argana Basin, 186f Argillaceous red, nodular, bioturbated wackestone, 166, 167f, 171f Aspidella, 131f Astartekløft, 192 Asteroid impact event, 224-25 Atar Group carbon isotope chemostratigraphy of, 80f paleogeographic map for, 74f Atmospheric oxygenation Archean-Proterozoic boundary with, 35-43, 42f geochemical proxies for, 41-42, 42f geological evidence of, 36f Australia, 56 carbon isotope data for carbonate sequences of, 58f chronostratigraphic framework of, 51f plot of ε Hf(t) versus age of concordant detrital zircons, 64f stratigraphic sections for, 58f Avalon Assemblage, 127 Avalonia, 74f sampling strategies with ,[193][194][195][196][197][198][199][200] 199f Chemozone, 29 Chhattisgarh basin, geological map showing, 54f 10.

10.1002/9781119382508.index

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Chemostratigraphy of the Cerro Victoria Formation (Lower Cambrian, Uruguay): Evidence for progressive climate stabilization across the Precambrian–Cambrian boundary

Chemical Geology (2007)

Claudio Gaucher Alcídes N. Sial Valderez P. Ferreira Márcio Martins Pimentel Leticia Chiglino

Chemostratigraphy

Laurentia

Stromatolite

Diamictite

10.1016/j.chemgeo.2006.06.014

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Citations (42)

Nd-Sr isotopic composition of microgranular enclaves of the Brejinho Batholith, Alto Pajeú Terrane, Borborema Province, NE Brazil

Helton Heleri Falcão Torres Alcídes N. Sial Edilton José dos Santos M. A. Silva Filho

Batholith

Source

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Tracing a Neoproterozoic subduction to collision magmatism in the eastern Pernambuco–Alagoas domain, northeastern Brazil

Journal of South American Earth Sciences (2023)

Valderez P. Ferreira Thyego R. Silva M.M.C. de Lima Alcídes N. Sial Adejardo Francisco da Silva Filho

Lithophile

Batholith

10.1016/j.jsames.2023.104457

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Citations (4)

Close spatial relationship between plutons and shear zones

Geology (2004)

Roberto F. Weinberg Alcídes N. Sial Gorki Mariano

Research Article| May 01, 2004 Close spatial relationship between plutons and shear zones R.F. Weinberg; R.F. Weinberg 1School of Geosciences, Monash University, Clayton, Victoria 3800, Australia Search for other works by this author on: GSW Google Scholar A.N. Sial; A.N. Sial 2Department of Geology, Federal University of Pernambuco, Recife, PE 50670-000, Brazil Search for other works by this author on: GSW Google Scholar G. Mariano G. Mariano 2Department of Geology, Federal University of Pernambuco, Recife, PE 50670-000, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information R.F. Weinberg 1School of Geosciences, Monash University, Clayton, Victoria 3800, Australia A.N. Sial 2Department of Geology, Federal University of Pernambuco, Recife, PE 50670-000, Brazil G. Mariano 2Department of Geology, Federal University of Pernambuco, Recife, PE 50670-000, Brazil Publisher: Geological Society of America Received: 23 Oct 2003 Revision Received: 12 Jan 2004 Accepted: 14 Jan 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (5): 377–380. https://doi.org/10.1130/G20290.1 Article history Received: 23 Oct 2003 Revision Received: 12 Jan 2004 Accepted: 14 Jan 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R.F. Weinberg, A.N. Sial, G. Mariano; Close spatial relationship between plutons and shear zones. Geology 2004;; 32 (5): 377–380. doi: https://doi.org/10.1130/G20290.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract This paper explores the relationship between granitic plutons and transcurrent shear zones using examples from the Borborema province, northeastern Brazil. Syntectonic plutons of this province generally have en cornue shapes and were emplaced preferentially within or at the margins of wide, regional-scale transcurrent shear zones, particularly where shear zones intersect major lithological boundaries. It is argued that the plutons' shapes and their closeness to shear zones are indicative of a causal relationship between granite plutons and shear zones. With the support of numerical models, it is further argued that pluton emplacement in transcurrent terranes is controlled by low-mean-pressure magma traps at the shoulders of shear zones, resulting from strain incompatibility caused by regional variations in rheological properties. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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10.1130/g20290.1

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Citations (135)

Crystallization conditions of two adjacent epidote + diopside-bearing granitic stocks, northeastern Brazil

Anais da Academia Brasileira de Ciências (2021)

Renan Siqueira Alcídes N. Sial Valderez P. Ferreira

The Tamboril and Olho d'Água granitic stocks are part of the abundant calc-alkalic magmatic epidote-bearing granitic rocks in the Cachoeirinha-Salgueiro Terrane (CST) in the Transversal Zone Domain, northeastern Brazil. The equigranular Olho d'Água stock is composed of medium-grained clinopyroxene-amphibole-biotite tonalite; the porphyritic Tamboril stock is medium- to coarse-grained amphibole biotite ± clinopyroxene granodiorite. Abundances of clinopyroxene and epidote vary inversely in both stocks. Amphibole-rich clots are regarded as fragments from the source region captured by granodioritic/tonalitic magma during its ascent. Epidote composition in the Olho d'Água stock (Ps18-26) and in Tamboril stock (Ps17-20) is consistent with crystallization under oxygen fugacity between QFM and HM buffers. In the Olho d'Água stock, calculated values of pressure range from 5.1 to 6.6 kbar and in the Tamboril stock from 6.2 to 7.0 kbar. Solidification temperatures estimated from plagioclase-hornblende pairs in the Olho D´Água stock range from 637 to 679 °C and for Tamboril from 587 to 641 °C. Zr-saturation temperature estimates are 788 to 819 °C (Olho d'Água) and 807 to 829 °C (Tamboril). Altogether our data suggest that the studied stocks crystallized from two distinct magmatic pulses formed from fractional melting of a single amphibolitic source. These two magma pulses underwent subsequent crystallization, in a convective magmatic chamber, at rather high pressure.

Amphibole

Hornblende

Fractional crystallization (geology)

Porphyritic

Batholith

10.1590/0001-3765202120210535

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Citations (1)

Mercury anomaly, Deccan volcanism and the end-Cretaceous Mass Extinction: REPLY

Geology (2016)

Eric Font Thierry Adatte Gerta Keller Alexandra Abrajevitch Alcídes N. Sial

Deccan Traps

Mercury

10.1130/g37717y.1

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Citations (4)