Results 1 to 10 of about 1,365 (198)

Algorithms and software for U‐Pb geochronology by LA‐ICPMS [PDF]

Geochemistry, Geophysics, Geosystems, 2016
AbstractThe past 15 years have produced numerous innovations in geochronology, including experimental methods, instrumentation, and software that are revolutionizing the acquisition and application of geochronological data. For example, exciting advances are being driven by Laser‐Ablation ICP Mass Spectrometry (LA‐ICPMS), which allows for rapid ...
Noah M. McLean, James F. Bowring, George Gehrels   +2 more
openaire   +2 more sources

Minimizing the effects of Pb loss in detrital and igneous U–Pb zircon geochronology by CA-LA-ICP-MS [PDF]

Geochronology
Detrital zircon geochronology by laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) is a widely used tool for determining maximum depositional ages and sediment provenance, as well as reconstructing sediment routing pathways ...
E. E. Donaghy, M. P. Eddy, F. Moreno, M. Ibañez-Mejia   +3 more
doaj   +1 more source

New zircon U-Pb dating and review of geological and geochronological data with implications for lithostratigraphy and crustal evolution of North Borborema Province, northeastern Brazil

Journal of the Geological Survey of Brazil, 2022
The northern portion of the Borborema Province, located north of the Patos Shear Zone (northeast of Brazil) is formed by litho-stratigraphic units dating from the Archean to the Neoproterozoic, with complex evolution resulting from several orogenic and ...
Tercyo Pinéo, Felipe Grandjean da Costa, Camila Franco Basto, Joseneusa Brilhante Rodrigues, Vladimir Cruz de Medeiros, Edney Smith de Moraes Palheta, Bruno de Oliveira Calado, Rogério Cavalcante, Raissa Beloti de Mesquita, Frank Gurgel Santos, Débora Melo Ferrer de Morais, Jocilene dos Santos Santana   +11 more
doaj   +1 more source

New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes [PDF]

Royal Society Open Science, 2014
Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the western border of Venezuela, where strata of the La Quinta Formation have
Max C. Langer, Ascanio D. Rincón, Jahandar Ramezani, Andrés Solórzano, Oliver W. M. Rauhut   +4 more
doaj   +1 more source

Detrital zircon provenance and paleogeography implications for Furnas Formation in the northwest of Paraná Basin [PDF]

Geologia USP. Série Científica, 2015
In the northwest of the Paraná Basin, between the states of Mato Grosso and Goiás, there are exposures of the Furnas Formation, where the Transbrasiliano Lineament is also recognized.
Thais Borba Santos, Fernando Mancini, Leonardo Fadel Cury, Francisco José Fonseca Ferreira   +3 more
doaj   +1 more source

SHRIMP Zircon U-Pb Dating of Mid-Pleistocene Dacite and Discussion of Relative Problems

Yankuang ceshi, 2015
K-Ar and U series disequilibria methods have been applied to geochronology research of young volcanic rocks in Tengchong, China. Previous K-Ar dating methods yielded ages of 0.013 to 17.84 Ma and isochron ages of 0.13 to 2.9 Ma in this area. The U series
LI Lin-lin, WANG Shu-bing, SHI Yu-ruo
doaj   +1 more source

Rutile Ages and Thermometry Along a Grenville Anorthosite Pathway

Geochemistry, Geophysics, Geosystems, 2023
The Grenville Orogen, in North America, contains a belt of Proterozoic anorthosite massifs with an episodic emplacement history. These distinctive magmas reflect extensive fractional crystallization of plagioclase from a mafic magma and contain layers ...
Janne Liebmann, Milo Barham, Christopher L. Kirkland   +2 more
doaj   +1 more source

Petrography, geochemistry and zircon U-Pb geochronology of the Siderian-Rhyacian granitoids of NW Bacajá Domain, Amazonian Craton

Journal of the Geological Survey of Brazil, 2022
Archean and Paleoproterozoic granitoids with different geochemical affinities are widely distributed in the basement of high-grade metamorphic rocks of the Bacajá Domain, which consists of Rhyacian granite-greenstone terrain with Archean-Siderian ...
Cleberson Vieira da Silva, Wagner Silva Amaral, Felipe Holanda dos Santos   +2 more
doaj   +1 more source

Petrographic, chemical and geochronological characteristics of the Onzaga Metarhyolite and its correlation with Ordovician magmatic events in the northern Andes, Colombia

Boletín Geológico, 2022
The macroscopic, microscopic, and chemical characteristics as well as crystallization age of the Onzaga Metarhyolite unit are described. The spatiotemporal relationships among the magmatic events that occurred during the Ordovician in the Santander, La ...
Gabriel Rodríguez García
doaj   +1 more source

A calcite reference material for LA‐ICP‐MS U‐Pb geochronology [PDF]

Geochemistry, Geophysics, Geosystems, 2017
AbstractU‐Pb dating of calcite is an emerging but rapidly growing field of application in geochronology with great potential to inform problems in landscape, basin, and mountain belt evolution, through age determination of diagenetic cements, vein mineralization, and geological formations difficult to date otherwise.
Nick M. W. Roberts, E. Troy Rasbury, Randall R. Parrish, Christopher J. Smith, Matthew S. A. Horstwood, Daniel J. Condon   +5 more
openaire   +3 more sources