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Science advances, an increased interest by consumers in the origin of the products they are buying, as well as the multifunctionality of research groups have increased the recent number of publications focusing on the use of strontium isotope ratios (87Sr/86Sr) as a geographic tracer of agri-food products.
Determining the geographical origin of win...
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... 1995 Brazil became a member of the International Organization of Vine and Wine (OIV, Organizzazione Internazionale della Vigna e del Vino) and in 2002 the first Brazilian geographical indication (GI) recognized in the country was the Vale dos Vinhedos region that included also the first designation of origin (DO). Currently, there are seven Brazilian regions that received the GI brand in the country (Figure 4.1 ...
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... Paraná-Etendeka is a Large Igneous Province ( Coffin and Eldholm, 1992;Bryan and Ernst, 2008;Self et. al, 2008) covering 1,500,000 km 2 , consisting of voluminous volcanic successions, 90% of which over the central-eastern sector of the South America continent (southern Brazil, eastern Paraguay, northwestern Uruguay, and northern Argentina; Figure 4.3), the remaining being found in Namibia, Africa (Cordani and Vandoros, 1967;Peate, 1997). ...
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... results of 87 Sr/ 86 Sr analyses for soil (labile fraction), microvinification and leaf samples from Brazil are reported in Table 4.2. The results revealed marked differences between the various types of samples (Figure 4.4). ...
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... soils of the Larentis and Don Laurindo vineyards have a brown color, small and medium subangular blocks, sandy-clayey structure, slightly hard, firm, plastic, and sticky. A comparison between the values of 87 Sr/ 86 Sr of the rocks from the three vineyards in relation to the obtained results is shown in Figure 4.5. The isotopic composition of these rocks shows a wide variation between 0.71373 and 0.72643 (Caxias do sul sub-group; Garland et al., 1995) and 0.70780 to 0.71226 (Gramado sub-group; Marques et al., 2006) with a large overlap, showing that the technique is effective for the Sr isotope characterization in vineyards from the Vale dos Vinhedos. ...
Citations
Strontium isotopes (87Sr/86Sr) are useful to trace processes in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to determine 87Sr/86Sr ratios on archived fluvial sediment samples from the low-density National Geochemical Survey of Australia. The present study targeted the northern parts of Western Australia, the Northern Territory, and Queensland, north of 21.5∘ S. The samples were taken mostly from a depth of ∼60–80 cm in floodplain deposits at or near the outlet of large catchments (drainage basins). A coarse (<2 mm) grain-size fraction was air-dried, sieved, milled, and digested (hydrofluoric acid + nitric acid followed by aqua regia) to release total Sr. The Sr was then separated by chromatography, and the 87Sr/86Sr ratio was determined by multicollector inductively coupled plasma mass spectrometry. The results demonstrate a wide range of Sr isotopic values (0.7048 to 1.0330) over the survey area, reflecting a large diversity of source rock lithologies, geological processes, and bedrock ages. The spatial distribution of 87Sr/86Sr shows coherent (multi-point anomalies and smooth gradients), large-scale (>100 km) patterns that appear to be broadly consistent with surface geology, regolith/soil type, and/or nearby outcropping bedrock. For instance, the extensive black clay soils of the Barkly Tableland define a >500 km long northwest–southeast-trending unradiogenic anomaly (87Sr/86Sr <0.7182). Where sedimentary carbonate or mafic/ultramafic igneous rocks dominate, low to moderate 87Sr/86Sr values are generally recorded (medians of 0.7387 and 0.7422, respectively). Conversely, In proximity to the outcropping Proterozoic metamorphic basement of the Tennant, McArthur, Murphy, and Mount Isa geological regions, radiogenic 87Sr/86Sr values (>0.7655) are observed. A potential correlation between mineralization and elevated 87Sr/86Sr values in these regions needs to be investigated in greater detail. Our results to date indicate that incorporating soil/regolith Sr isotopes in regional, exploratory geoscience investigations can help identify basement rock types under (shallow) cover, constrain surface processes (e.g. weathering and dispersion), and, potentially, recognize components of mineral systems. Furthermore, the resulting Sr isoscape and future models derived therefrom can also be utilized in forensic, archaeological, palaeontological, and ecological studies that aim to investigate, for example, past and modern animal (including humans) dietary habits and migrations. The new spatial Sr isotope dataset for the northern Australia region is publicly available (de Caritat et al., 2022a; https://doi.org/10.26186/147473).
