Publication Date:
2018
Description:
〈span〉〈div〉Abstract〈/div〉The study presents data from a geochemical till survey conducted in the Oppdal/Berkåk area of Central Norway. Using a 1 × 2.5 km grid, 877 samples were taken to cover a 2000-km〈sup〉2〈/sup〉 survey area (one site per 2.2 km〈sup〉2〈/sup〉). The samples were air dried, sieved to 〈2 mm and analysed for 51 elements following an aqua regia extraction. A number of geochemical anomalies, related to lithology, a prominent fault zone, mineralization or environmental processes, are delineated for a large number of elements. Four main anomalies are outlined. A large, elongated (40 km long) multi-element anomaly is associated with normal faults and adjacent rhyolitic-andesitic rocks occurring in the area. Elements associated with gold (As, Sb) form an anomaly on the central high-altitude area just to the east of the fault related anomaly. Two further areas that display high concentrations for many elements are located around Orkelsjøen and Soknedal. Climatic/topographic conditions have a strong influence on the Hg and Se distribution. Several areas that display geochemical anomalies, where more detailed studies could be conducted were also identified.〈strong〉Supplementary material:〈/strong〉 Geochemical maps for all elements, boxplots showing till samples grouped in tectonic units, and boxplots showing till samples grouped by main lithologies are available at 〈a href="https://doi.org/10.6084/m9.figshare.c.4038950"〉https://doi.org/10.6084/m9.figshare.c.4038950〈/a〉〈/span〉
Print ISSN:
1467-7873
Electronic ISSN:
1467-7873
Topics:
Chemistry and Pharmacology
,
Geosciences
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