Results 21 to 30 of about 511 (62)

Origin of Ultrapotassic, Ultracalcic, Ultrabasic SiO2‐Undersaturated Magmas: The Case Study of the Pleistocene Cupaello Kamafugite Monogenetic Volcano, Central Italy

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract The Pleistocene (∼0.6 Ma) Cupaello monogenetic volcano, cropping out in central Italy, belongs to the Intra Apennine Province (IAP). It is represented by a single lava flow with kamafugitic composition, associated with a volumetrically limited pyroclastic deposit and a phosphate‐rich layer close to the small vent.
Michele Lustrino, Lorenzo Pistocchi, Sara Ronca, Francesca Innocenzi, Samuele Agostini   +4 more
wiley   +1 more source

Análises prospectivas em mineralizações hospedadas em depósitos orogênico e do tipo óxido de ferro-cobre-ouro-(prata) no Greenstone Belt Faina, Brasil, utilizando dados multifonte [PDF]

, 2017
O Greenstone Belt Faina está localizado na porção sul do Bloco Arqueano de Goiás e vem sendo pesquisado desde o século XVIII por conta dos seus depósitos auríferos.
Araujo, Kawinã, Campos, Daniela Schievano de, Carvalho, Marcelo Juliano de, Rodrigues, Vinícius Gomes, Silva, Adalene Moreira, Toledo, Catarina Laboure Bemfica   +5 more
core   +1 more source

New U-Pb SHRIMP-II zircon intrusion ages of the Cana Brava and Barro Alto layered complexes, central Brazil: constraints on the genesis and evolution of the Tonian Goias Stratiform Complex [PDF]

, 2017
The Cana Brava, Niquelândia and Barro Alto complexes (Goiás, central Brazil) are three of the largest mafic-ultramafic layered complexes in the world and their origin has been a matter of debate for several decades.
CIPRIANI, Anna, Correia, Ciro T., GIOVANARDI, TOMMASO, Girardi, Vicente A. V., MAZZUCCHELLI, Maurizio, Sato, Kei, Tassinari, Colombo C. G.   +6 more
core   +1 more source

A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism [PDF]

, 2021
The Neoproterozoic Paraguay Belt in mid-eastern Mato Grosso, western Brazil, records the geological evolution of the margins of western Gondwana. The lack of absolute geochronology for the Paraguay Belt has hampered both regional and global stratigraphic
Figueiredo, Luan Nonato, Galvez, Matthieu Emmanuel, Leite, Jayme Alfredo Dexheimer, Manoel, Talitta Nunes, Selby, David   +4 more
core   +2 more sources

Isotopic constraints on contamination processes in the Tonian Goiás Stratiform Complex [PDF]

, 2018
The Tonian Goiás Stratiform Complex (TGSC, Goiás, central Brazil), is one of the largest mafic-ultramafic layered complexes in the world, emplaced during the geotectonic events that led to the Gondwana accretion.
Cipriani, Anna, Correia, Ciro T., Giovanardi, Tommaso, Girardi, Vicente A. V., Lugli, Federico, Mazzucchelli, Maurizio, Tassinari, Colombo C. G.   +6 more
core   +1 more source

Tectonic evolution of the Juvenile Tonian Serra da Prata magmatic arc in the Ribeira belt, SE Brazil: Implications for early west Gondwana amalgamation [PDF]

, 2017
The evolution of the Ribeira belt resulted from the progressive amalgamation of several terranes against the eastern margin of the São Francisco Craton between ca. 620 and 580 Ma. This work brings new field, U-Pb geochronology, geochemistry and isotopic (
Armstrong, Richard, Dantas, Elton, de Araujo Peixoto, Caroline, de Morisson Valeriano, Claudio, Heilbron, Monica, Ragatky, Diana, Simonetti, Antonio   +6 more
core   +1 more source

Neoproterozoic anatexis of 2.9 Ga old granitoids in the Goiás-Crixás archean block, Central Brazil: evidence from new SHRIMP U-Pb data and Sm-Nd isotopes [PDF]

, 2003
The first SHRIMP U-Pb ages for granitoid rocks from the southern part of the Goiás-Crixás Archean Block (Caiçara and Uvá complexes) are presented and discussed in combination with Sm-Nd isotopic data in order to elucidate the main aspects of the ...
Armstrong, Richard Austin, Dantas, Elton Luiz, Fuck, Reinhardt Adolfo, Jost, Hardy, Pimentel, Márcio Martins, Potrel, Alain   +5 more
core   +2 more sources

High spatial resolution analysis of Pb and U isotopes for geochronology by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) [PDF]

, 2009
A determinação de idades através do decaimento dos isótopos radioativos 235U e 238U para os isótopos radiogênicos 207Pb e 206Pb, respectivamente, utilizando o mineral zircão (ZrSiO4), é amplamente aplicada para decifrar processos geológicos.
Bühn, Bernhard, Dantas, Elton Luiz, Matteini, Mássimo, Pimentel, Márcio Martins   +3 more
core   +2 more sources

Petrografia e geoquímica de gnaisses da região de Indiara, porção central do arco magmático de Goiás [PDF]

, 2017
In the region of Indiara, Goiás, there is an extensive belt of gneisses related to the Goiás Magmatic Arc, near the contact with the supracrustal rocks of the Anicuns-Itaberaí Metavolcanosedimentary Sequence.
Conceição, Fabiano Tomazini da, Montibeller, Cibele Carolina, Navarro, Guillermo Rafael Beltran, Valeriano, Claudio de Morisson, Zanardo, Antenor   +4 more
core   +2 more sources

U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil [PDF]

, 2001
U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt.
ARMSTRONG, RICHARD, FISCHEL, DANIELLE P., FUCK, REINHARDT A., PIMENTEL, MÁRCIO M.   +3 more
core   +4 more sources