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Mostrando ítems 11-20 de 1810
Isotopic evidence on human bone for declining maize consumption during the little ice age in central western Argentina
(Elsevier, 2014-09)
This paper explores variation in maize consumption among human societies in arid environments of central-western Argentina over the last 2500 years. Increasingly positive human d13C signatures suggest a high intake of C4 ...
Stable isotopes, carbon-14 and hydrochemical composition from a basaltic aquifer in São Paulo State, Brazil
(2017-02-01)
The Cretaceous Serra Geral Aquifer (SGA) is contained within one of the largest continental flood basalts in the world, reaching a thickness up to 1700 m in the center of the Paraná Basin. The SGA is one of the most important ...
Groundwater flow and residence time in a karst aquifer using ion and isotope characterization
(Springer, 2016-11)
In order to identify the origin of the main processes that affect the composition of groundwater in a karstic aquifer, a hydrogeochemical and isotopic study was carried out of water from numerous observation wells located ...
The source of metals of the Schramm Gold Mine, Santa Catarina : evidence of lead isotope and rare earth elementsA Fonte dos Metais da Mina de Ouro do Schramm, Santa Catarina: Evidências de Dados de Isótopos de Pb e Elementos Terras Raras
(Instituto de Geociências /Universidade Federal do Rio Grande do Sul, 2005)
Stable isotopes on jumbo squid (Dosidicus gigas) beaks to esitmate its trophic positon: comparison between stomach contents and stable isotopes
(Journal of the Marine Biological Association of the United Kingdom, 2006)
Stomach contents and carbon (C) and nitrogen (N) stable isotope analysis were used to evaluate trophic relationships of jumbo squid, Dosidicus gigas. Buccal masses, beaks and stomach contents of large and medium maturing-sized ...
The application of U-isotopes to assess weathering in contrasted soil-water regime in Brazil
(2018-02-01)
This paper presents the use of U-series radionuclides 238U and 234U to evaluate the biogeochemical disequilibrium in soil cover under a contrasted soil-water regime. The approach was applied in three profiles located in ...
Isotopic characterization of the metabasites and amphibolites of the Acungui and Setuva Groups of the Ribeira Belt
(2002-12-01)
Pb, Rb, Sr, Sm and Nd isotope analyses were carried out on amphibolitic rocks from Campo Largo (PR), Rio Branco do Sul (PR) and Adrianópolis (PR) and for the metabasite from Adrianópolis and Apiai (SP), all belonging to ...
Sm-Nd system in total rock open versus closed isotopic composition in zones of high deformation
(2002-12-01)
High strain shear zones of Brasiliano age, developed in Paleoproterozoic basement gneiss of the Caicó region, Borborema Province, NE Brazil, were associated with medium- to low-grade metamorphism and deformational processes ...