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            <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Regional stream sediment geochemical data compilation

November 2020

Release notes

The regional stream sediment geochemical data compilation comprises data for more than 30 000 samples across Yukon. This compilation updates the work of Héon (2003). This new compilation includes results from the reanalysis of more than 24 000 samples; inductively coupled plasma mass spectrometry (ICPMS) analysis provides upgraded detection limits and a broader range of elements relative to previous analytical data. In addition to analytical data, efforts have been made to improve sample location accuracy. The data in this release are organized by analytical method with the geodatabase having six feature classes:


1. RGS_SITE_WATER - site specific physiography and water quality data. These data are unchanged from the original releases.
 
2. RGS_HEON - the same data as released in Héon (2003) with minor updates to sample location.
 
3. RGS_AAS - all samples analyzed by atomic absorption spectrometry. Most of these data are superseded by INAA and ICPMS data.
 
4. RGS_INAA - all samples analyzed by instrumental neutron activation analysis (INAA) and fire assay-neutron activation (FA-NA) analysis.
 
5. RGS_ICPMS - all samples analyzed by inductively coupled plasma mass spectrometry (ICPMS).
 
6. RGS_All - includes all AAS, INAA and ICPMS data.
 

Collection of stream sediment samples in Yukon began in 1976 and ended in 2006. Three analytical methods have been used to analyze the minus 0.177 mm fraction (-80 mesh) of these samples: AAS, INNA (and FA-NA) and ICPMS. A simple description of each method is given below.

For atomic absorption spectrometry (AAS) a 1 g aliquot is 'partially digested' using Lefort aqua regia or concentrated hot nitric acid. The digestion product is analyzed using an atomic absorption spectrometer. Oxide and silicate minerals are partially digested while some sulphide minerals are erratically volatilized. This means that AAS cannot be used to obtain accurate REE, Ta, Nb, As, Sb, Sn, Hg, Cr, or Au determinations.

For instrumental neutron activation analysis ( INAA), aliquots of sieved sediment (the minus 0.177 mm fraction) or milled rock ranging from 5 to 40 g are encapsulated and irradiated in a nuclear reactor before counting the primary gamma radiation induced by the neutron irradiation with a high resolution germanium gamma ray detector. Fire assay-neutron activation (FA-NA) analysis is similar but includes a pre-concentration fire assay step prior to irradiation and analysis. Results for both INAA and FA-NA are similar to those for samples analyses by fusion or other total digestion techniques. Neutron activation detection limits are typically higher than those by acid digestion - ICPMS. Commodity and pathfinder elements such as Au, As, Sb and W have reasonable detection limits by INAA and the data generated are relatively precise.

For ICPMS analysis, aliquots of sieved sediment ( the minus 0.177 mm fraction) ranging from 0.5 to 1 g are prepared using a partial digestion technique, typically aqua regia, followed by analysis of dissolution product by ICPMS. Sulphide minerals are completely oxidized and dissolved whereas most oxide and silicate minerals are only partially digested. This means that results produced by partial digestion methods are acceptable for elements such as Ag, As, Mo, Ni, Pb, Sb, Tl, and Zn but values for elements such as Al, Ba, Cr, Fe, P, Sn, Ti, Y, and Zr are likely to not reflect the actual element concentration in a sample. The sample size used for routine RGS sample analysis is too small be representative of Au in the original sample and thus Au by aqua regia digestion - ICPMS has poor precision.

Further upgrades to this database are not anticipated. All samples that could be found in the GSC-Ottawa warehouse have been reanalyzed using ICPMS. Any errors or omissions in this database should be reported to the Yukon Geological Survey. Your feedback contributes to improving the accuracy of the geoscience databases for Yukon.

Contact: [YGSMinerals@yukon.ca](mailto:YGSMinerals@yukon.ca) ; [geology@yukon.ca](mailto:geology@yukon.ca)

Distributed from [GeoYukon](https://yukon.ca/geoyukon) by the [Government of Yukon](https://yukon.ca/maps) . Discover more digital map data and interactive maps from Yukon's digital map data collection.

For more information: [geomatics.help@yukon.ca](mailto:geomatics.help@yukon.ca)</gco:CharacterString>
            <gmd:PT_FreeText>
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                  <gmd:LocalisedCharacterString locale="#fra">Compilation de données géochimiques sur les sédiments fluviaux régionaux

novembre 2020

Notes de publication

La compilation de données géochimiques régionales sur les sédiments des cours d'eau comprend des données pour plus de 30 000 échantillons prélevés au Yukon. Cette compilation met à jour l'œuvre de Héon (2003). Cette nouvelle compilation inclut les résultats de la réanalyse de plus de 24 000 échantillons ; l'analyse par spectrométrie de masse à plasma à couplage inductif (ICPMS) fournit des limites de détection améliorées et une gamme plus large d'éléments par rapport aux données analytiques précédentes. Outre les données analytiques, des efforts ont été déployés pour améliorer la précision de la localisation des échantillons. Les données de cette version sont organisées par méthode analytique, la géodatabase comportant six classes d'entités :


1. RGS_SITE_WATER - données de physiographie et de qualité de l'eau spécifiques au site. Ces données sont inchangées par rapport aux versions originales.
 
2. RGS_HEON - les mêmes données que celles publiées dans Héon (2003) avec des mises à jour mineures concernant l'emplacement des échantillons.
 
3. RGS_AAS - tous les échantillons analysés par spectrométrie d'absorption atomique. La plupart de ces données sont remplacées par les données de l'INAA et de l'ICPMS.
 
4. RGS_INAA - tous les échantillons analysés par analyse d'activation neutronique instrumentale (INAA) et analyse par pyroanalyse par activation neutronique (FA-NA).
 
5. RGS_ICPMS : tous les échantillons analysés par spectrométrie de masse à plasma à couplage inductif (ICPMS).
 
6. RGS_all : inclut toutes les données AAS, INAA et ICPMS.
 

La collecte d'échantillons de sédiments fluviaux au Yukon a commencé en 1976 et s'est terminée en 2006. Trois méthodes analytiques ont été utilisées pour analyser la fraction de moins 0,177 mm (-80 mesh) de ces échantillons : AAS, INNA (et FA-NA) et ICPMS. Une description simple de chaque méthode est donnée ci-dessous.

Pour la spectrométrie d'absorption atomique (AAS), une aliquote de 1 g est « partiellement digérée » à l'aide d'eau régale de Lefort ou d'acide nitrique chaud concentré. Le produit de digestion est analysé à l'aide d'un spectromètre d'absorption atomique. Les oxydes et les silicates sont partiellement digérés, tandis que certains minéraux sulfurés sont volatilisés de façon irrégulière. Cela signifie que l'AAS ne peut pas être utilisé pour obtenir des déterminations précises de REE, Ta, Nb, As, Sb, Sn, Hg, Cr ou Au.

Pour l'analyse instrumentale par activation neutronique (INAA), des aliquotes de sédiments tamisés (fraction de moins 0,177 mm) ou de roche broyée allant de 5 à 40 g sont encapsulées et irradiées dans un réacteur nucléaire avant de compter le rayonnement gamma primaire induit par l'irradiation neutronique avec un détecteur de rayons gamma au germanium à haute résolution. L'analyse par pyroanalyse par activation neutronique (FA-NA) est similaire mais comprend une étape d'pyroanalyse préalable à la concentration avant l'irradiation et l'analyse. Les résultats pour l'INAA et le FA-NA sont similaires à ceux obtenus pour les analyses d'échantillons par fusion ou d'autres techniques de digestion totale. Les limites de détection par activation neutronique sont généralement plus élevées que celles obtenues par digestion acide (ICPMS). Les éléments de base et les éléments indicateurs tels que Au, As, Sb et W ont des limites de détection raisonnables par l'INAA et les données générées sont relativement précises.

Pour l'analyse par ICPMS, des aliquotes de sédiments tamisés (fraction de moins 0,177 mm) allant de 0,5 à 1 g sont préparées en utilisant une technique de digestion partielle, généralement à l'eau régale, suivie d'une analyse du produit de dissolution par ICPMS. Les minéraux sulfurés sont complètement oxydés et dissous alors que la plupart des minéraux oxydés et silicatés ne sont que partiellement digérés. Cela signifie que les résultats produits par les méthodes de digestion partielle sont acceptables pour des éléments tels que Ag, As, Mo, Ni, Pb, Sb, Tl et Zn, mais que les valeurs pour des éléments tels que Al, Ba, Cr, Fe, P, Sn, Ti, Y et Zr sont susceptibles de ne pas refléter la concentration réelle des éléments dans un échantillon. La taille de l'échantillon utilisée pour l'analyse de routine des échantillons RGS est trop petite pour être représentative de l'Au dans l'échantillon d'origine et donc de l'Au par digestion à l'eau régale - l'ICPMS a une faible précision.

Aucune autre mise à niveau de cette base de données n'est prévue. Tous les échantillons qui ont pu être trouvés dans l'entrepôt du GSC-Ottawa ont été réanalysés à l'aide de l'ICPMS. Toute erreur ou omission dans cette base de données doit être signalée à la Commission géologique du Yukon. Vos commentaires contribuent à améliorer la précision des bases de données géoscientifiques du Yukon.

Contact : [YGSMinerals@yukon.ca] (mailto : YGSMinerals@yukon.ca) ; [geology@yukon.ca] (mailto : geology@yukon.ca)

Distribué depuis [GeoYukon] (https://yukon.ca/geoyukon) par le [gouvernement du Yukon] (https://yukon.ca/maps). Découvrez d'autres données cartographiques numériques et des cartes interactives issues de la collection de données cartographiques numériques du Yukon.

Pour plus d'informations : [geomatics.help@yukon.ca] (mailto : geomatics.help@yukon.ca)</gmd:LocalisedCharacterString>
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                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">ESRI REST: Map Service</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">ArcGIS Online layers</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Couches ArcGIS Online</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Web Service;ESRI REST;eng</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Service Web;ESRI REST;eng</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine xmlns:xlink="http://www.w3.org/1999/xlink" xlink:role="urn:xml:lang:fra-CAN">
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://mapservices.gov.yk.ca/arcgis/rest/services/GeoYukon/GY_Geological/MapServer/38</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">ESRI REST: Map Service</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">ArcGIS Online layers</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Couches ArcGIS Online</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Web Service;ESRI REST;eng</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Service Web;ESRI REST;eng</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine xmlns:xlink="http://www.w3.org/1999/xlink" xlink:role="">
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://map-data.service.yukon.ca/GeoYukon/Geological/Regional_Geochemical_Surveys_RGS_INAA_250k/</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">HTTPS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Shape files</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Fichiers Shape</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Dataset;HTML;eng</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Données;HTML;eng</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine xmlns:xlink="http://www.w3.org/1999/xlink" xlink:role="">
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://yukon.maps.arcgis.com/sharing/rest/content/items/19c74766f7644b67b2c0394376fd04b7/info/metadata/metadata.xml?format=default&amp;output=html</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">HTTPS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">XML metadata</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Métadonnées XML</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Dataset;HTML;eng</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Données;HTML;eng</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine xmlns:xlink="http://www.w3.org/1999/xlink" xlink:role="">
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://open.yukon.ca/data/ac415f65-662b-41f1-876c-1ef49327fa1a</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">HTTPS</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Original metadata (https://open.yukon.ca)</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Métadonnées originales (https://open.yukon.ca)</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="gmd:PT_FreeText_PropertyType">
                        <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">Dataset;HTML;eng</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#fra">Données;HTML;eng</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
  </gmd:distributionInfo>
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