Results 51 to 60 of about 253 (188)

U-Pb (Zircon) Ages of Metavolcanic Rocks From the Itaiacoca Group: Tectonic Implications [PDF]

Geologia USP. Série Científica, 2003
The main aim of this work is to present and discuss the U-Pb ages obtained for zircon grains from metavolcanic rocks of theItaiacoca Group. The Itaiacoca Group is a metavolcano-sedimentary sequence, which occurs as a narrow belt between theCunhaporanga ...
Oswaldo Siga Jr., Miguel Angelo Stipp Basei, Kei Sato, Hélcio José dos Prazeres Filho, Leonardo Fadel Cury, Werner Weber, Cláudia Regina Passarelli, Ossama Mohamed Harara, José Manoel dos Reis Neto   +8 more
doaj  

Rare metal granites in the structures of the Russian sector of Pacific ore belt

Записки Горного института, 2016
Data are presented on the geology of areas of rare metal granites proliferation in the Russian sector of the Pacific Ore Belt that make one take a fresh look at the East Asian granitoid area to update its metallogeny. History is reviewed of studying rare
V. I. Alekseev
doaj   +1 more source

Feldspar Albitization With Implications for Reservoir Quality Evolution of Eocene Turbidite Sandstones in Offshore Espírito Santo Basin, Eastern Brazil

Journal of Petroleum Geology, EarlyView.
ABSTRACT The diagenetic albitization of plagioclase and K‐feldspar grains is a transformative process that significantly alters sandstone's detrital composition and formation water chemistry, impacting reservoir quality. In this study, Eocene turbidite sandstones from the offshore Espírito Santo Basin, Brazil, were investigated to elucidate the role of
Eveline E. Zambonato, Luiz F. De Ros, Howri Mansurbeg   +2 more
wiley   +1 more source

Constraining the geotherm beneath the British Isles from Bayesian inversion of Curie depth: integrated modelling of magnetic, geothermal, and seismic data [PDF]

Solid Earth, 2019
Curie depth offers a valuable constraint on the thermal structure of the lithosphere, based on its interpretation as the depth to 580 ∘C, but current methods underestimate the range of uncertainty. We formulate the estimation of Curie depth within
B. Mather, J. Fullea
doaj   +1 more source

Rare Earth Element Potential in the Araí Rift Metavolcanic, Central Brazil: Gamma‐Ray Signatures, Mineralogy and Exploration Implications

Terra Nova, EarlyView.
ABSTRACT Although central Brazil hosts significant ion‐adsorption rare earth element (REE) deposits associated with A‐type granites, their coeval volcanic counterparts have been largely overlooked as exploration targets. This study demonstrates that acidic metavolcanic rocks of the Araí Group share strong radiometric, geochemical and mineralogical ...
Yuri Ribeiro, Nilson Francisquini Botelho, Valmir da Silva Souza, Diego Guilherme da Costa Gomes   +3 more
wiley   +1 more source

Top-down structures of mafic enclaves within the Valle Fértil magmatic complex (Early Ordovician, San Juan, Argentina)

Geologica Acta, 2009
Magmatic structures related to the mechanical interaction between mafic magmas and granitoids have been studied in the Valle Fértil calc-alkaline igneous complex, Argentina.
A. CASTRO, R.D. MARTINO, G. VUJOVICH, J.E. OTAMENDI, Eleonora PINOTTI, F. D'ERAMO, A. TIBALDI, A. VIÑAO   +7 more
doaj  

Characteristics and Geodynamic Evolution of Indosinian Granitoids in South China: A Case Study in the Guangdong Province

Geosciences
The Indosinian granitoids of Guangdong Province, South China, record a complex history of crust–mantle interactions during the Triassic assembly of the South China Block (SCB) and Indochina Block (ICB). Integrated zircon U–Pb geochronology, geochemistry,
Jianrong Wang, Zhipeng Xie, Chuandong Xue, Wenchang Li, Lei Dou, Wei Wang, Xingwang Song   +6 more
doaj   +1 more source

Geology, petrology and U-Pb geochronology of Serra da Rajada Granitic Pluton: implications about ediacaran magmatic evolution in NE portion of the Rio Piranhas-Seridó Domain (NE of Borborema Province)

Geologia USP. Série Científica, 2015
The Ediacaran plutonic activity, related to the Brasilian/Pan-African orogeny, is one of the most important geological features in the Borborema Province, formed by batholiths, stocks and dikes.
Alan Pereira da Costa, Marcos Antonio Leite do Nascimento, Antônio Carlos Galindo, Alexandre Ranier Dantas   +3 more
doaj   +1 more source

HYDRODYNAMICS AND HEAT AND MASS TRANSFER IN MUSHROOM-SHAPED HEADS OF THERMOCHEMICAL PLUMES

Геодинамика и тектонофизика, 2018
The model of a thermochemical mantle plume is described. The scheme of origination of the plume from the core-mantle boundary is presented. The basic ratios for determining the thermal power and the diameters of thermochemical plumes are given.
A. G. Kirdyashkin, A. A. Kirdyashkin
doaj   +1 more source

On the crystallization conditions of the Neoproterozoic, high-K calc-alkaline, Bragança Paulista-type magmatism, southern Brasília Orogen, SE Brazil

Brazilian Journal of Geology
: Syn-orogenic Neoproterozoic granitic magmatism (ca. 630-600 Ma) in southern Brasília Orogen includes large batholiths of compositionally expanded high-K calc-alkaline granites (lato sensu) and small occurrences constituted by anatetic leuco-granites ...
Andrés Fabián Salazar-Naranjo, Silvio Roberto Farias Vlach   +1 more
doaj   +1 more source