Guilherme Mallmann

Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina

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Hugh O’Neill

Monash University

Edinei Koester

Universidade Federal do Rio Grande do Sul

Farid Chemale

Universidade do Vale do Rio dos Sinos

Raúl O. C. Fonseca

Ruhr University Bochum

Koji Kawashita

Universidade de São Paulo

Rômmulo Vieira Conceição

Universidade Federal do Rio Grande do Sul

J Avila

Australian National University

Manuel E. Schilling

Austral University of Chile

Gustavo W. Bertotto

Universidad Nacional de La Pampa

I. H. Campbell

Australian National University

Cooperative Institutions

Universidade Federal do Rio Grande do Sul

Australian National University

Instituto de Geociencias

University of Bonn

Universidade de São Paulo

Environmental Earth Sciences

Centre National de la Recherche Scientifique

University of Queensland

University of Chile

University of Münster

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New constraints on the genesis and long-term stability of Os-rich alloys in the Earth’s mantle

Geochimica et Cosmochimica Acta (2012)

Raúl O. C. Fonseca Vera Laurenz Guilherme Mallmann Ambre Luguet Nadine Hoehne

10.1016/j.gca.2012.04.002

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Citations (106)

CARACTERIZAÇÃO LITOLÓGICA E EVOLUÇÃO METAMÓRFICA DA PORÇÃO LESTE DO COMPLEXO METAMÓRFICO BRUSQUE, SANTA CATARINA

Brazilian Journal of Geology (2004)

Ruy Paulo Philipp Guilherme Mallmann Maria de Fátima Bitencourt Eduardo Reckziegel de Souza Marcos M. A. de Souza

The eastern portion of the Brusque Metamorphic Complex comprises dominantly metassedimentary rocks, with subordinate metavolcanics. Sheets of peraluminous leucogranites are concordantly intrusive in this sequence, as well as larger granitic bodies, as the Compra Tudo, Valsungana and Serra dos Macacos granitoids. Regional deformation and orogenic metamorphism are here interpreted as polyphase events of Neoproterozoic age associated to continental collision. A younger metamorphic event is related to heat transfer from granitic magmas and to the development of ductile shear zones. Protoliths are dominantly marine sediments probably deposited in rift systems evolving towards continental margin enviroments. No evidence of ancient oceanic crust is found. Turbidites are characterized by systematically alternate pelites, feldspathic sandstones and quartz sanstones, with minor amounts of limestone and marble. Massive metavolcanic rocks of tholeiitic affinity are interpreted as former subaqueous basalt flows. Minor occurrences of chemical exhalative interflows are found as banded iron formations. Metamorphic evolution is complex and intimately related to deformation events. M 1 e M 2 metamorphic events are related to low-pressure, regional orogenic metamorphism synchronous to the development of foliations S 1 and S 2 . Both were formed during continental collision, which caused important tectonic interleaving of the volcano-sedimentary sequence. Temperature conditions range from those of the greenschist facies to lower amphibolite, marked by chlorite, biotite, garnet, andaluzite and cordierite zones. Metamorphic zoning pattern is complex, with repetition and incompatibility of zones due to tectonic interleaving. M 3 metamorphic event is related to the intrusion of syn-transcurrence (D 3 ), Neoproterozoic Valsungana and Serra dos Macacos granites, which develop contact metamorphic aureoles containing pelitic and calc-silicate rocks formed under albite-epidote hornfels to pyroxene hornfels facies conditions. Mylonitic rocks formed under greenshist facies conditions are found along the Major Gercino and Itajai- Perimbo shear zones.

Greenschist

continental collision

10.5327/rbg.v34i1.1088

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Citations (26)

Thermal evolution of inverted basins: Constraints from apatite fission track thermochronology in the Cuyo Basin, Argentine Precordillera

Radiation Measurements (2005)

J Avila Farid Chemale Guilherme Mallmann André Weissheimer de Borba F.F. Luft

Thermochronology

Fission track dating

Paleogene

Outcrop

10.1016/j.radmeas.2004.08.009

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Citations (8)

EVOLUÇÃO ESTRUTURAL DA PORÇÃO SUL DO TERRENO NICO PÉREZ, URUGUAI: REGISTRO DA CONVERGÊNCIA ENTRE AS PLACAS RIO DE LA PLATA E KALAHARI NO FINAL DO NEOPROTEROZÓICO

Revista Brasileira de Geociências (2004)

Guilherme Mallmann Farid Chemale Luiz F. G. Morales

Archean to Eo-Paleozoic lithotectonic units occur in the Nico Pérez Terrane (Uruguay), reworked Rio de la Plata Craton, in a complex structural framework. Based on structural analysis of the units from southern Nico Pérez Terrane we recognize two structural events (E 1 -E 2 ), with four deformational phases (D 1 -D 2 -D 3 -D 4 ). Both E 1 and E 2 events developed under a transpressive regime during the late Neoproterozoic as result of the oblique convergence between Rio de la Plata (west) and Kalahari (east) plates. The E 1 event (σ ∼ S60E-N60W) represents the progression of plate tectonic convergence, and was developed under ductile conditions. The early stages of this event (D 1 ) generated tight to isoclinal folds (D 1 ) that were transposed by top-to-NW thrust shear zones (D 2 ), responsible for the stacking of infracrustal and supracrustal rocks, which are represented by the Carapé Complex and the Lavalleja Metamorphic Complex, respectively. Lower greenschist lo lower amphibolite metamorphism was associated with this deformation, and temperatures increase from the NW to the SE. There was a temperature decreasing during the late stages of continental collision process, and development of dextral NNE-SSW trending transcurrent shear zones (D 3 ) under lower greenschist facies, due to lateral tectonic escape. The structures of D 3 , phase are included here as a minor component of the Sierra Ballena and Dorsal de Canguçu sinistral transcurrent system. The E 2 event (σ ∼ S75E-N75W), formed undcr ductile-brittle to brittle conditions, developed open folds, faults and conjugate fractures (D 4 ), reactivating some structures of the E 1 event.

Greenschist

Transpression

10.25249/0375-7536.2004342201212

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Citations (5)

Ba isotopic compositions in stardust SiC grains from the Murchison meteorite: Insights into the stellar origins of large SiC grains

Geochimica et Cosmochimica Acta (2013)

J Avila T. R. Ireland F. Gyngard E. Zinner Guilherme Mallmann

Murchison meteorite

Presolar grains

Carbonaceous chondrite

Allende meteorite

10.1016/j.gca.2013.03.039

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Citations (15)

Combined stratigraphic and isotopic studies of Triassic strata, Cuyo Basin, Argentine Precordillera

Geological Society of America Bulletin (2006)

J Avila Farid Chemale Guilherme Mallmann Koji Kawashita Richard A. Armstrong

Research Article| September 01, 2006 Combined stratigraphic and isotopic studies of Triassic strata, Cuyo Basin, Argentine Precordillera J. N. Ávila; J. N. Ávila 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil Search for other works by this author on: GSW Google Scholar F. Chemale, Jr.; F. Chemale, Jr. 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil Search for other works by this author on: GSW Google Scholar G. Mallmann; G. Mallmann 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil Search for other works by this author on: GSW Google Scholar K. Kawashita; K. Kawashita 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil Search for other works by this author on: GSW Google Scholar R. A. Armstrong R. A. Armstrong 2Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information J. N. Ávila 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil F. Chemale, Jr. 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil G. Mallmann 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil K. Kawashita 1Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501–970, Brazil R. A. Armstrong 2Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Publisher: Geological Society of America Received: 30 Aug 2005 Revision Received: 13 Feb 2006 Accepted: 03 Mar 2006 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2006) 118 (9-10): 1088–1098. https://doi.org/10.1130/B25893.1 Article history Received: 30 Aug 2005 Revision Received: 13 Feb 2006 Accepted: 03 Mar 2006 First Online: 08 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 J. N. Ávila, F. Chemale, G. Mallmann, K. Kawashita, R. A. Armstrong; Combined stratigraphic and isotopic studies of Triassic strata, Cuyo Basin, Argentine Precordillera. GSA Bulletin 2006;; 118 (9-10): 1088–1098. doi: https://doi.org/10.1130/B25893.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The evolution of the Triassic–Cretaceous Cuyo Basin, located in the Andean Precordillera (NW Argentina), was mainly controlled by extensional–transtensional tectonics along NW-trending structures inherited from Paleozoic sutures. Stratigraphic and isotopic studies are herein presented in order to constrain the sedimentary infilling and source areas, as well as the age of Triassic strata related to the active faulted margin of the Cacheuta sub-basin. The whole stratigraphic package of the Cuyo Basin is interpreted as a second-order depositional sequence, comprising lowstand (alluvial fan deposits), transgressive (fluvial-deltaic and lacustrine deposits), and high-stand (oxidized lacustrine and high-sinuosity fluvial deposits) systems tracts. This stacking pattern was mainly controlled by the interplay between sedimentary influx and accommodation space, with important volcaniclastic contribution, especially during the early stages of basin development. Sm-Nd depleted-mantle model ages (TDM) for both basement and volcano-sedimentary samples range from 867 to 1345 Ma. All samples have negative ϵNd (t) values (−0.33 to −5.02). Basal deposits present older TDM model ages compared to intermediate-positioned deposits, and upper deposits present a wider range of model ages. This time-integrated factor correlates with paleo-current data, which indicate changes in the source areas through time. The Nd isotopic signature also suggests that sources of sediments for the Cacheuta sub-basin during the Triassic were restricted to units of Mesoproterozoic (Grenvillian) age, probably related to the Cuyania terrane. The U-Pb sensitive high-resolution ion microprobe (SHRIMP) zircon age of 243 ± 5 Ma, obtained in juvenile magmatic zircons from a lithoclast-free ignimbrite interlayered within the basal alluvial fan facies of the Cacheuta sub-basin, places the lowstand deposits in the Olenekian and establishes a potential chronostratigraphic horizon for future correlations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Pica (typography)

10.1130/b25893.1

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Citations (51)

Calibration of an Empirical Thermometer and Oxybarometer based on the Partitioning of Sc, Y and V between Olivine and Silicate Melt

Journal of Petrology (2013)

Guilherme Mallmann Hugh O’Neill

The evolution of basaltic magmas depends on their redox state, hence oxygen fugacity, but there is increasing evidence that this intensive thermodynamic variable may be less well understood in basalts than commonly supposed. The redox state of terrestrial basalts has to a large extent been inferred from the Fe3+/Fe2+ ratios of their quenched glasses. However, this quantity appears to be significantly affected during late and post-eruptive processes in magmatic systems (e.g. by degassing, charge-transfer reactions of redox-variable species, and alteration), so that the degree to which the Fe3+/Fe2+ ratios preserved in basaltic glasses reflect the oxidation state of the magma at high temperature is unclear. Because olivine is the first silicate mineral to crystallize from primitive basaltic liquids on cooling following decompression, the equilibrium partitioning relations preserved in olivine phenocrysts in basalts are, in principle, less disturbed by these late and post-eruptive processes and, therefore, may better reflect the high-temperature (pre-eruptive) conditions of the magma. Here we calibrate an oxybarometer based on the strong sensitivity of the partitioning of vanadium between olivine and silicate melt to oxygen fugacity. Our empirical parameterization, calibrated over a range of redox conditions between four log10 units above and below the quartz–fayalite–magnetite (QFM) oxygen buffer, takes into account the effects of temperature, olivine composition (i.e. Mg/Fe ratios) and melt composition (namely the activities of CaO, SiO2, AlO1·5, NaO0·5 and KO0·5), and allows oxygen fugacity determinations to within ∼0·25 log10 units. We also explore the sensitivity of the exchange partitioning of Sc and Y between olivine and melt to temperature as a geothermometer. Our calibration indicates that this geothermometer allows temperature to be estimated to within 15°C, but precision is strongly dependent on the Sc and Y measurements in olivine and melt.

Mineral redox buffer

Fayalite

Fugacity

Phenocryst

Melt inclusions

10.1093/petrology/egt001

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Citations (127)

Mantle diversity beneath the Colombian Andes, Northern Volcanic Zone: Constraints from Sr and Nd isotopes

Lithos (2005)

Andrés Rodríguez-Vargas Edinei Koester Guilherme Mallmann Rômmulo Vieira Conceição Koji Kawashita

Xenolith