ISOTOPIC COMPOSITION OF Lu, Hf AND Yb IN GJ-01, 91500 AND MUD TANK REFERENCE MATERIALS MEASURED BY LA-ICP-MS: APPLICATION OF THE Lu-Hf GEOCHRONOLOGY IN ZIRCON

• Main Authors: MÁRCIO INÁCIO ALVES, BRUNA SAAR DE ALMEIDA, LETÍCIA MUNIZ DA COSTA CARDOSO, ANDERSON COSTA DOS SANTOS, CIRO APPI, ANELISE LOSANGELA BERTOTTI, FARID CHEMALE, ARMANDO DIAS TAVARES JR, MARIA VIRGINIA ALVES MARTINS, MAURO CÉSAR GERALDES
• Format: Article
• Language: English
• Published: Universidade do Estado do Rio de Janeiro 2019-06-01
• Series: Journal of Sedimentary Environments
• Subjects: lu-hf isotope method; isobaric interference; high spatial resolution analysis; zircon; georeference materials calibration; analytical research
• Online Access: https://www.e-publicacoes.uerj.br/index.php/jse/article/view/43877

The Lu-Hf method has been used in the investigation of geological samples in order to understand processes and sources of magmatic rocks. This paper discusses the reference materials GJ-01, 91.500 and Mud Tank isotopic composition by LA-ICP-MS to investigate how suitable they are for the zircon analysis through this technique. The results show that the three zircons have homogeneous compositions for the proposed objectives. Considering that relatively high Yb contents produce isobaric interference, the results of this work have shown that the Mud Tank is the best reference material, since it has lower values of this element. Thus, the Mud Tank allows to obtain more reliable results due to lower correction requirements. In addition, it should be emphasized that the presented data corroborate the application of Hf isotopes for geological evolution and characterization of magmatic sources. The high abundances of Hf in the zircon grains allow to preserve the isotopic signatures of its crystallization from magmatic sources, allowing to characterize the isotopic signatures of the reservoir (s) that gave origin to that rocks, and in case studies of paleoclimate and paleoceanographic records and/or of sedimentary basins evolution, it allows to identify the origin of the sediments or temporal and spatial changes of the source of sedimentary particles.