Results 21 to 30 of about 438 (161)

Geoquímica de Gnaisses do arco magmático de Goiás na Região Sul do Estado de Goiás

Geologia USP. Série Científica, 2007
Gnaisses graníticos a trondhjemíticos da região de Pontalina, sul do estado de Goiás, mostram composição cálcica a cálcio-alcalina, metaluminosa a peraluminosa.
Guillermo Rafael Beltran Navarro, Antenor Zanardo   +1 more
doaj   +1 more source

Geologia e caracterização tecnológica do minério de manganês da mina Córrego do Cocho, Itapira (SP)

Geologia USP. Série Científica, 2011
Três jazimentos de manganês e uma mina geneticamente resultantes da lateritização de gonditos (espessartita quartzitos) foram pesquisados. Estas concentrações encontram-se hospedadas em metassedimentos do Grupo Itapira (Paleoproterozoico) e apresentam ...
Nelson Angeli, Henrique Khan, Gabriel Mineo Ito, Sebastião Gomes de Carvalho, Jairo Roberto Jimenez-Rueda, Ulisses Cyrino Penha   +5 more
doaj   +1 more source

Lithogeochemistry and geochronology of the subalkaline felsic plutonism that marks the end of the Paleoproterozoic orogeny in the Salvador-Esplanada belt, São Francisco craton (Salvador, state of Bahia, Brazil)

Brazilian Journal of Geology
Studies conducted over the last decade concerning the rocks that underlie the municipality of Salvador have shown a complex geological history with a great diversity of medium- to high-grade metamorphic lithotypes, deformed in several phases and ...
Jailma Santos de Souza-Oliveira, Jean-Jacques Peucat, Johildo Salomão Figueiredo Barbosa, Luiz César Correa-Gomes, Simone Cerqueira Pereira Cruz, Ângela Beatriz Menezes Leal, Jean-Louis Paquette   +6 more
doaj   +1 more source

Minettes do Stock Monzonítico Glória Norte: evidência de magmatismo ultrapotássico pós-orogênico, com assinatura de subducção, no Sistema Orogênico Sergipano

Geologia USP. Série Científica, 2018
Lamprófiros ocorrem como enclaves microgranulares no Stock Monzonítico Glória Norte (SGN) (588 ± 5 Ma), localizado na parte central do Domínio Macururé, do Sistema Orogênico Sergipano, no estado de Sergipe.
Milena Prado Fontes, Herbet Conceição, Maria de Lourdes da Silva Rosa, Vinicius Anselmo Carvalho Lisboa   +3 more
doaj   +1 more source

Isotopic fractionation associated to nitrate attenuation by ferrous iron containing minerals [PDF]

E3S Web of Conferences, 2019
Biotic and abiotic laboratory experiments of nitrate and nitrite reduction by Fe-containing minerals were performed and the isotopic fractionation of the different reactions was calculated in order to determine whether it is possible to distinguish ...
Margalef-Marti Rosanna, Carrey Raul, Soler Albert, Otero Neus   +3 more
doaj   +1 more source

Fingerprinting of ruby and sapphire gemstones through Fourier-transform infrared (FTIR) methodologies [PDF]

European Journal of Mineralogy
Gemstones have significant economic, cultural, and artistic value. Advances in the treatment and production of synthetic gemstones create the need for more precise identification methods to distinguish natural stones from their synthetic and treated ...
A. Soares de Sousa, E. M. C. Gomes, L. Bayés-García, A. Di Mariano, M. Garcia-Valles   +4 more
doaj   +1 more source

Development of CCMb: A Low‐Mg Calcite Reference Material for In Situ Measurement of δ18O, δ13C and Selected Trace Elements

Geostandards and Geoanalytical Research, EarlyView.
Key Points Low‐Mg calcite RM developed for in situ microanalysis applications in palaeoclimatology (δ18O, δ13C; Mg, Sr m/m). New data for calcite CRM IAEA‐603 (δ18O, δ13C by SIMS and GS‐IRMS; Mg m/m). No detectable IMF effect of Mg on SIMS δ18O determinations for mass fractions < 3650 μg g‐1.
Andreas T. Hertwig, Maciej G. Śliwiński, Irene Cantarero, Richard A. Stern, Carles Fàbrega, Jakub T. Śliwiński, Thomas Ludwig, František Majs, William Nachlas, John H. Fournelle, Xavier Llovet, Rachelle B. Turnier, David Parcerisa, Anna Travé   +13 more
wiley   +1 more source

Petrologia eta mineralogiaren erabilera zeramika arkeologikoen azterketan

EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria, 2003
Arazo arkeologikoei irtenbideren bat aurkitzeko erabiltzen diren teknika fisiko-kimikoen multzoari Arkeometria deritzo. Zeramika arkeologikoen ikerketetan, alde batetik, teknologiari buruzko informazioa lortzeko erabiltzen dira eta bestetik, zeramikak egiteko erabiltzen diren lehengaien jatorriari buruzko datuak ateratzeko.
Zuluaga Ibargallartu, María Cruz, Ortega Cuesta, Luis Ángel, Larrea Bilbao, Francisco José, Olaetxea Elosegi, Carlos   +3 more
openaire   +2 more sources

Provenance and Petrological Evolution of Sand Injection Complexes: Insights From Heavy Mineral Analysis in the Paleogene Forearc Succession of the San Joaquin Basin

Basin Research, Volume 38, Issue 3, May–June 2026.
The study of heavy mineral assemblages with statistical analysis resolves provenance signatures and quantifies syn‐emplacement modification of sand injection complexes. Results demonstrate transformative petrological processes, including density‐dependent hydraulic sorting and mechanical grain degradation.
Gustavo Zvirtes, Andrew Morton, Andrew Hurst, Ruy Paulo Philipp, Wiktor Luzinski, Giuseppe Palladino, Luciano Alessandretti   +6 more
wiley   +1 more source

Braincase anatomy and palaeoneurology of Venetoraptor gassenae, a lagerpetid pterosauromorph from the Late Triassic of southern Brazil

Palaeontology, Volume 69, Issue 2, 2026.
Abstract There is a growing consensus that pterosaurs and the flightless Lagerpetidae are closely related. This relationship is supported by apomorphies throughout the skeleton, including endocranial character states such as a well‐developed floccular fossa and a tall anterior semicircular canal. Our knowledge of lagerpetid anatomy has been improved by
Lísie V.S. Damke, Leonardo Kerber, Mario Bronzati, Maurício S. Garcia, Martín D. Ezcurra, Sterling J. Nesbitt, Rodrigo T. Müller   +6 more
wiley   +1 more source