Regional Geochemical Surveys - RGS - Site Water - 250k

ISO-19139 Metadata

Metadata Information

Metadata language: eng
Metadata character set: utf8
Last update: 2020-12-07
Metadata maintenance:
Update frequency: notPlanned
Metadata contact:
Role: custodian
Organization's name: Yukon Geological Survey – Government of Yukon
Contact information:
Address:
e-mail address: ygstech@gov.yk.ca
Scope of the data described by the metadata: dataset
Scope name: dataset
Name of the metadata standard used: ISO 19139 Geographic Information - Metadata - Implementation Specification
Version of the metadata standard: 2007
Metadata identifier: 767C6B7A-18FA-4DDE-813D-E0CA3818786B

Data Identification Information

Resource citation:
Title: Regional Geochemical Surveys - RGS - Site Water - 250k
Date:
Reference date - creation: 2020-11-01
Date:
Reference date - publication: 2020-11-01
Presentation format: mapDigital
Themes or categories of the resource: geoscientificInformation
Descriptive keywords:
Keyword type not provided
Keywords: Downloadable Data
Keyword thesaurus:
Citation reference: 723f6998-058e-11dc-8314-0800200c9a66
Descriptive keywords:
Keyword type not provided
Keywords: RGS, Geochemistry, Stream Sediments, Regional Geochemical Survey, Yukon, GeoYukon
Abstract: Regional stream sediment geochemical data compilationNovember 2020Release notesThe 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:RGS_SITE_WATER – site specific physiography and water quality data. These data are unchanged from the original releases.RGS_HEON – the same data as released in Héon (2003) with minor updates to sample location.RGS_AAS – all samples analyzed by atomic absorption spectrometry. Most of these data are superseded by INAA and ICPMS data.RGS_INAA – all samples analyzed by instrumental neutron activation analysis (INAA) and fire assay-neutron activation (FA-NA) analysis.RGS_ICPMS – all samples analyzed by inductively coupled plasma mass spectrometry (ICPMS).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@gov.yk.ca; geology@gov.yk.caDistributed from GeoYukon by the Government of Yukon. Discover more digital map data and interactive maps from Yukon's digital map data collection.For more information: geomatics.help@gov.yk.ca
Purpose: This product contains stream sediment geochemical data from regional geochemical surveys (RGS) in Yukon.
Dataset language:eng
Dataset character set: utf8
Resource maintenance:
Update frequency: asNeeded
Resource constraints:
General constraints:
Limitations of use: Open Government Licence - Yukon (https://open.yukon.ca/data/open-government-licence-yukon)
Spatial representation type: vector
Processing environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595
Resource extent:
Geographic element:
Bounding rectangle:
Extent contains the resource: true
West longitude: -143.914751
East longitude: -123.244794
North latitude: 69.745025
South latitude: 59.753188
Resource extent:
Geographic element:
Bounding rectangle:
Extent contains the resource: true
West longitude: -143.914751
East longitude: -123.244794
North latitude: 69.745025
South latitude: 59.753188
Credits: Government of Yukon
Resource point of contact:
Role: pointOfContact
Organization's name: Yukon Geological Survey – Government of Yukon
Contact information:
Address:
e-mail address: ygstech@gov.yk.ca

Spatial Representation

Vector Data

Level of topology for this dataset: geometryOnly
Geometric objects:
Object type: point
Object count: 31380

Reference System Information

Reference system identifier:
Value: 3578
Code space: EPSG
Version: 6.13(9.3.0.0)

Data Quality

Scope of quality information:
Level of the data:dataset

Distribution Information

Distributor:
Distributor contact:
Role: distributor
Organization's name: Geomatics Yukon – Government of Yukon
Contact information:
Address:
e-mail address: geomatics.help@gov.yk.ca
Distribution format:
Format name: Feature Class
Format version:
Transfer options:
Online distribution information:
Online location: https://yukon.maps.arcgis.com/home/item.html?id=58921af571e94770afd6d13cfcba4f17
Transfer options:
Online distribution information:
Online location: https://map-data.service.yukon.ca/GeoYukon/Geological/Regional_Geochemical_Surveys_RGS_Site_Water_250k/