January 7, 2026 Dataset Open Access

Pospiech, Solveig; Middleton, Maarit

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        <foaf:name>Pospiech, Solveig</foaf:name>
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        <foaf:name>Middleton, Maarit</foaf:name>
        <foaf:givenName>Maarit</foaf:givenName>
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    <dct:title>Data publication: Elemental data from transpired fluid from Norway spruce needles of the Horizon 2020 project NEXT</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2026</dct:issued>
    <dcat:keyword>Norway spruce</dcat:keyword>
    <dcat:keyword>mineral exploration</dcat:keyword>
    <dcat:keyword>Finland</dcat:keyword>
    <dcat:keyword>transpired fluid</dcat:keyword>
    <dcat:keyword>Gold</dcat:keyword>
    <dcat:keyword>ore geology</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2026-01-07</dct:issued>
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    <dct:description>&lt;p&gt;&lt;strong&gt;1. Overview&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;This repository contains the **final, cleaned chemistry data** that were produced from the 2019 Raja field campaign of the Horizon 2020 Project NEXT.&lt;br&gt; The data combine:&lt;/p&gt; &lt;ul&gt; &lt;li&gt;Norway spruce needle transpired fluids concentrations for a set of selected elements.&lt;/li&gt; &lt;li&gt;Corresponding soil‑till depth, point location, lithology and basic tree information.&lt;/li&gt; &lt;li&gt;Element‑specific relative‑standard‑deviation (RSD) uncertainties that were calculated from laboratory‑derived uncertainty parameters.&lt;/li&gt; &lt;/ul&gt; &lt;p&gt;All files are provided in **CSV** format (UTF‑8, `,` separator) and/or the R programming language binary format RData.&lt;/p&gt; &lt;p&gt;&lt;br&gt; &lt;strong&gt;2. Column description&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;**Field Descriptions for Repository Metadata**&lt;/p&gt; &lt;p&gt;#### **Point Identification &amp;amp; Metadata**&lt;br&gt; 1. **PointID** &amp;ndash; Unique identifier for each sampling point in the dataset (e.g., `NEXT-2019-193`).&lt;br&gt; 2. **till_depth** &amp;ndash; Depth of the till layer (in meters) at the sampling location.&lt;br&gt; 3. **ID_num** &amp;ndash; Numeric identifier for the point (e.g., `193`).&lt;br&gt; 4. **grainsize_2mm_pct** &amp;ndash; Percentage of grain size &amp;gt;2mm in the soil sample (proxy for rock fragments or coarse material).&lt;br&gt; 5. **OM_thickness** &amp;ndash; Thickness of organic matter (cm) in the soil profile.&lt;br&gt; 6. **Soilwetness_by_photo** &amp;ndash; Soil wetness category inferred from field photos (e.g., `mesic` = moist, `sub-xeric` = moderately dry).&lt;br&gt; 7. **Soilwetness_cat** &amp;ndash; Numeric ranking of soil wetness (likely 1&amp;ndash;7, with `1` = driest, `7` = wettest).&lt;br&gt; 8. **notes_by_photos** &amp;ndash; Qualitative observations from site photos (e.g., &amp;quot;paludified areas nearby,&amp;quot; &amp;quot;boulders present&amp;quot;).&lt;/p&gt; &lt;p&gt;#### **Geophysical &amp;amp; Electrical Properties**&lt;br&gt; 9. **conductivity_ph-acid** &amp;ndash; Electrical conductivity (EC) measured after acidification (mS/m).&lt;br&gt; 10. **conductivity_ph-initial** &amp;ndash; Initial EC of the soil sample (mS/m).&lt;br&gt; 11. **conductivity_pit** &amp;ndash; EC measured in the field pit (mS/m).&lt;br&gt; 12. **conductivity** &amp;ndash; Conductivity averaged or processed for analysis (units vary).&lt;br&gt; 13. **dielectric permittivity_pit** &amp;ndash; Dielectric constant measured in the pit (proxy for soil moisture).&lt;br&gt; 14. **dielectric permittivity** &amp;ndash; Processed or averaged dielectric permittivity value.&lt;br&gt; 15. **pH_initial** &amp;ndash; Initial pH of the soil sample.&lt;br&gt; 16. **pH_with acid** &amp;ndash; pH after acidification (indicates buffer capacity).&lt;br&gt; 17. **pore water conductivity** &amp;ndash; EC of extracted pore water (mS/m).&lt;/p&gt; &lt;p&gt;#### **Geospatial &amp;amp; Environmental Context**&lt;br&gt; 18. **VTEM, TMI, APR** &amp;ndash; Geophysical survey metrics (VTEM = Vertical Electromagnetic, TMI = Total Magnetic Intensity, APR = Airborne Radiometrics).&lt;br&gt; 19. **Soilwetness** &amp;ndash; Categorical soil wetness classification (e.g., `mesic`, `sub-xeric`).&lt;br&gt; 20. **Soiltype** &amp;ndash; Predominant soil type (e.g., `mineral soil`, `peat`).&lt;br&gt; 21. **Naturetype** &amp;ndash; Ecological classification (e.g., `Boreaaliset luonnonmets&amp;auml;t` = &amp;quot;Boreal natural forests&amp;quot;).&lt;br&gt; 22. **TMI_class** &amp;ndash; Categorization of Total Magnetic Intensity (e.g., `low`, `middle`, `high`).&lt;br&gt; 23. **Lithology** &amp;ndash; Original rock type classification (e.g., `Calcsilicate rocks`, `Mafic rocks`).&lt;br&gt; 24. **Lithology_updated** &amp;ndash; Updated lithological classification (refining earlier interpretations).&lt;br&gt; 25. **Lithology_updated_Sol** &amp;ndash; Lithology-specific to soil horizons (e.g., `Mafic rocks + quartzite`).&lt;br&gt; 26. **Mineralization** &amp;ndash; Qualitative assessment of mineralized zones (e.g., `barren`, `potential`, `min`).&lt;br&gt; 27. **Deposit** &amp;ndash; Type of geological deposit (e.g., `Till`, `hardpan layer`).&lt;br&gt; 28. **TMI_cat, VTEM_cat, APPRES_cat** &amp;ndash; Categorized geophysical survey results (e.g., `high` intensity).&lt;br&gt; 29. **vegetation_class_EFTAS** &amp;ndash; Vegetation classification (e.g., `mesic heath forest`).&lt;br&gt; 30. **i.ID_num** &amp;ndash; Redundant numeric ID (same as `ID_num`).&lt;br&gt; 31. **x, y** &amp;ndash; Cartesian coordinates for the sampling point.&lt;br&gt; 32. **Fotos** &amp;ndash; Reference to associated field photos (e.g., `104-0905`).&lt;/p&gt; &lt;p&gt;#### **Site &amp;amp; Sampling Details**&lt;br&gt; 33. **GeneralSiteDescription** &amp;ndash; Textual description of terrain (e.g., &amp;quot;flat, paludified area starts 1m below&amp;quot;).&lt;br&gt; 34. **ForestType** &amp;ndash; Dominant forest type (e.g., `VMT` = &amp;quot;V&amp;auml;limets&amp;auml;&amp;quot; [forest type code]).&lt;br&gt; 35. **Soil_paludification** &amp;ndash; Degree of peatland/wetland influence on soil (e.g., `not paludified`).&lt;br&gt; 36. **Soil_nutrient_status** &amp;ndash; Nutrient availability assessment (e.g., `normal`).&lt;br&gt; 37. **Observations2019** &amp;ndash; Anomalies or notes from 2019 fieldwork (e.g., &amp;quot;eggs of gnomes in upper podsol layer&amp;quot;).&lt;br&gt; 38. **SedimentType** &amp;ndash; Type of sediment observed (e.g., `Till`, `Sand`).&lt;br&gt; 39. **SedimentGenesis** &amp;ndash; Origin of sediment (e.g., `glacial`, `alluvial`).&lt;br&gt; 40. **Pointtype** &amp;ndash; Classification of sampling point (e.g., `replicate`).&lt;br&gt; 41. **TMI_intensity, VTEM_intensity, APPRES_intensity** &amp;ndash; Quantitative geophysical survey intensities.&lt;br&gt; 42. **GPS-Easting, GPS-Northing** &amp;ndash; Precise GPS coordinates for the point.&lt;br&gt; 43. **SampleID** &amp;ndash; Unique identifier for lab samples (e.g., `TF-NEXT-2019-193-NrS-tf-0A`).&lt;br&gt; 44. **Date_full** &amp;ndash; Timestamp of sample collection/analysis.&lt;/p&gt; &lt;p&gt;#### **Geochemical Data**&lt;br&gt; 45. **Al, B, Ba, Bi, ... Zn** &amp;ndash; Concentrations of elements (likely in **ppm/mg/g**) measured via lab analysis (e.g., ICP-MS).&lt;br&gt; &amp;nbsp; &amp;nbsp;*Note: These columns represent a full suite of geochemical elements (e.g., Aluminum, Barium, Lead, Zinc) critical for mineral exploration, environmental studies, or soil health assessments.*&lt;/p&gt; &lt;p&gt;---&lt;br&gt; ### **Key Notes for Repository Users**&lt;br&gt; - **Units**: Conductivity (mS/m), pH (unitless), dielectric permittivity (dimensionless), GPS coordinates (meters, local system).&lt;br&gt; - **Categorical Fields**: Wetness, lithology, and mineralization use standardized codes (e.g., `mesic` vs. `xeric`).&lt;br&gt; - **Geophysical Data**: VTEM/TMI/APR are airborne survey metrics linked to subsurface mineralization.&lt;br&gt; - **Geochemical Data**: Elemental concentrations are essential for understanding soil fertility, contamination, or ore potential.&lt;/p&gt; &lt;p&gt;---&lt;br&gt; ### **Suggested Use Cases**&lt;br&gt; - **Mineral Exploration**: Cross-reference `Mineralization` + `TMI_cat` with elemental data (e.g., high `Fe`, `Cr` for mafic rocks).&lt;br&gt; - **Soil Science**: Analyze `Soilwetness` vs. `dielectric permittivity` to model moisture regimes.&lt;br&gt; - **Ecological Studies**: Correlate `vegetation_class_EFTAS` with `Soil_nutrient_status`.&lt;/p&gt;</dct:description>
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