Autor(es): Batista, Maria Joao ; de Oliveira, Daniel Pipa Soares ; Salgueiro, Rute ; Inverno, Carlos
Data: 2024
Identificador Persistente: http://hdl.handle.net/10400.9/4279
Origem: Repositório do LNEG
Assunto(s): Lanthanum; Stream sediments; Geochemical mapping; Regression equation; Lantânio; Sedimentos de corrente; Cartografia geoquímica; Equação de regressão; Beira Baixa (Portugal)
ABSTRACT: The existence of a large number of chemical analyses resulting from decades of geochemical exploration campaigns, yields huge numbers of analytical results produced with different analytical methods, sampling protocols and sampling means. Therefore, it is necessary to level these analytical results to make them comparable and thus take advantage of the potential of geochemical information from contiguous areas. In this study, a levelling technique was used on geochemical datasets of tested bands between the 1:25 000 scale maps, 293/294 and 305/306 sheets, respectively, from the Beira Baixa region where stream sediments were sampled during a project for rare earth elements exploration. These samples were analysed for lanthanum by the same analytical methods and in the same laboratory, but in different periods and the border effects were observed. These levelling techniques must be adapted to the data to be compared and in the present case the disappearance of the border effect of the analytical results of 293/294 and 305/306 topographic sheets was observed.
