Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Sensitive high-resolution ion microprobe"'
Autor:
Marcelo Lacerda Vasquez, Umberto Giuseppe Cordani, Kei Sato, Jaime dos Passos de Oliveira Barbosa, Maria Telma Lins Faraco, Victor Câmara Maurer
Publikováno v:
Brazilian Journal of Geology, Vol 49, Iss 3 (2019)
Abstract The Iriri-Xingu domain, located in the central part of the Amazonian craton, consists of extensive occurrences of Paleoproterozoic volcanic rocks and granites with published ages of ca. 1990 to 1840 Ma, which show a strong crustal contributi
Externí odkaz:
https://doaj.org/article/46e28c3ed9004d21b6d1c9ef2f4ba251
Autor:
Karine da Rosa Arena, Léo Afraneo Hartmann, Hans-Joachim Massonne, Cristiano Lana, Colombo Celso Gaeta Tassinari, Joachim Opitz, Kei Sato, Sérgio Benjamin Baggio, Viter Magalhães Pinto, Matheus Philipe Brückmann, Daniel Barbosa Knijnik
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The Parana volcanic province is a window into mantle and crustal processes in the Cretaceous. The variability and complexity of this province can be determined through the study of minerals. An integrated study of zircon from Parana lavas (one high-T
Autor:
Christopher L. Kirkland, Ruby C. Marsden, Noreen J. Evans, Matthew L. Daggitt, Ung San Ahn, Bjarne Friedrichs, Martin Danišík
Publikováno v:
Computers & Geosciences. 158:104947
U-Th disequilibrium dating of zircon is used to determine the crystallisation age of zircon crystals which formed ≲350 ka. In this work we present a new analytical and data reduction workflow for zircon U-Th disequilibrium analysis using a Sensitiv
Publikováno v:
Minerals, Vol 10, Iss 787, p 787 (2020)
Minerals
Volume 10
Issue 9
Minerals
Volume 10
Issue 9
SHRIMP (Sensitive high resolution ion microprobe) zircon U-Pb dating of the two main igneous rocks types in the Karkonosze Pluton, porphyritic and equigranular monzogranite, yield 206Pb/238U ages between 312.0 ±
2.9 and 306.9 ±
2.9 and 306.9 ±
Publikováno v:
Chemical Geology. 583:120461
Previous work on oxygen isotopic compositions of hematite samples by secondary ion mass spectrometry (SIMS) has yielded large oxygen isotopic variability (>3 ‰) within individual samples. Deconvolving instrumental effects from geological variation
Publikováno v:
Precambrian Research. 358:106112
The Hawkeye Granite Gneiss and Lyon Mountain Granite Gneiss are widespread Mesoproterozoic plutonic rocks that occur in the amphibolite- to granulite-facies Adirondack Highlands of northern New York, USA. The strongly deformed Hawkeye Granite Gneiss,
Publikováno v:
New Zealand Journal of Geology and Geophysics. 60:209-219
The Mount Somers Volcanic Group (MSVG) forms a large (c. 18,000 km2) calc-alkaline volcanic complex on New Zealand’s Eastern Province. U–Pb secondary ion mass spectrometry (SIMS) spot ages on zircon from the lower glassy ignimbrite in Rakaia Gorg
Autor:
Jorge A. Vazquez, David A. John, Christopher D. Henry, Joseph P. Colgan, Matthew A. Coble, Kathryn E. Watts
Publikováno v:
Chemical Geology. 439:139-151
Zircon geochronology is a critical tool for establishing geologic ages and time scales of processes in the Earth's crust. However, for zircons compromised by open system behavior, achieving robust dates can be difficult. Chemical abrasion (CA) is a r
Autor:
Jaime dos Passos de Oliveira Barbosa, Kei Sato, Umberto G. Cordani, Maria Telma Lins Faraco, Marcelo Lacerda Vasquez, Victor Câmara Maurer
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Brazilian Journal of Geology v.49 n.3 2019
Brazilian Journal of Geology
Sociedade Brasileira de Geologia (SBGEO)
instacron:SBGEO
Brazilian Journal of Geology, Volume: 49, Issue: 3, Article number: e20190067, Published: 21 OCT 2019
Brazilian Journal of Geology, Vol 49, Iss 3 (2019)
Universidade de São Paulo (USP)
instacron:USP
Brazilian Journal of Geology v.49 n.3 2019
Brazilian Journal of Geology
Sociedade Brasileira de Geologia (SBGEO)
instacron:SBGEO
Brazilian Journal of Geology, Volume: 49, Issue: 3, Article number: e20190067, Published: 21 OCT 2019
Brazilian Journal of Geology, Vol 49, Iss 3 (2019)
The Iriri-Xingu domain, located in the central part of the Amazonian craton, consists of extensive occurrences of Paleoproterozoic volcanic rocks and granites with published ages of ca. 1990 to 1840 Ma, which show a strong crustal contribution for th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e8f13ca272fa6ed3a5c40011085bf78