TY - JOUR AU - Araújo, Daniel Ferreira AU - Boaventura, Geraldo Resende AU - Mulholland, Daniel Santos AU - Garnier, Jeremie AU - Machado, Wilson AU - Babinski, Marly AU - Dantas, Elton Luiz PY - 2020/12/21 Y2 - 2024/03/29 TI - DETERMINING SEDIMENTARY MATERIAL SOURCES IN A BRAZILIAN URBAN LAKE USING Zn STABLE ISOTOPE COMPOSITIONS OF BOTTOM SEDIMENTS: A PRELIMINARY STUDY JF - Geochimica Brasiliensis JA - Geochim. Bras. VL - 34 IS - 2 SE - Articles DO - 10.21715/GB2358-2812.2020342130 UR - https://geobrasiliensis.org.br/geobrasiliensis/article/view/659 SP - 130-137 AB - <p>Zinc isotopes ratios provide qualitative and quantitative information about contributions from different Zn sources in the environment. Here we present the results of a preliminary study to identify the main sources controlling Zn isotope signatures of sediments from Lake Paranoá (Brazil), an urban water reservoir. The Zn isotope ratios were measured by MC-ICP-MS and expressed as δ<sup>66/64</sup>Zn notation relative to the JMC 3-0749-L solution. The studied sediments showed a narrow isotopic range (+0.00 to +0.13 ‰; <em>n</em> = 10) similar to that reported for intensely weathered soils worldwide (from -0.4 to +0.2‰). The geoaccumulation index (I<sub>geo</sub>) also suggests low or negligible influence of Zn anthropogenic source. This research provides a baseline assessment of the Zn isotopes signatures in lake sedimentary environments under the influence of these weathered soils.</p> ER -