Identification_Information: Citation: Citation_Information: Originator: K. Ford, Natural Resources Canada Publication_Date: Unknown Publication_Time: Unknown Title: TillGRS Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: data\radiometrics\shapefiles\TillGRS.shp Description: Abstract: Results of laboratory gamma ray spectrometry analysis for 722 till samples collected by Dr. L. Dredge (GSC) are provided in TillGRS.xls along with positional information as decimal degrees and as UTM coordinates (NAD 83). The sand fraction (0.063 - 2 mm) that was separated from the silt and clay fractions by dry sieving was used for the LGRS analysis. Sample weights ranged between 237g and 499g. In addition to the results of the LGRS analysis (K, eU and eTh), K by ICP-AES and U and Th by INAA analysis were also provided by Dr. L. Dredge and are included. A number of statistical calculations to describe the radioactive element signatures of these till samples are included. Following the text portion of this document histograms of the potassium, uranium and thorium concentrations and the eU/eTh, eU/K and eTh/K ratios in the greater than 0.063mm size fraction of the till samples as determined by LGRS analysis are provided. These are followed by histograms of the potassium concentrations in the less than 0.002mm size fraction as determined by ICP-AES analysis and uranium and thorium concentrations in the less than 0.063mm size fraction as determined by INAA analysis. Purpose: All rocks and soils are naturally radioactive due to variations in the amounts of the three most common, naturally occurring radioactive elements, potassium, uranium and thorium. With the use of very sensitive geophysical instruments small differences in the amounts of potassium, uranium and thorium can be accurately measured to provide a diagnostic fingerprint or signature of the different rocks and surficial deposits in an area. The mapping of these differences can help geologists determine where the various rock formations occur and may assist them to map sometimes cryptic compositional variations that may not be macroscopically evident and to better understand the kind of processes that led to their formation. Mapping the variations in radioactive elements can also help prospectors and exploration geologists to more effectively explore for certain types of mineral deposits. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -76.110983 East_Bounding_Coordinate: -69.838139 North_Bounding_Coordinate: 70.048743 South_Bounding_Coordinate: 67.909983 Keywords: Theme: Theme_Keyword: Radioactive Theme_Keyword: gamma ray spectrometry Place: Place_Keyword: Baffin Island Place_Keyword: Nunavut Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Ken Ford Contact_Organization: Natural Resources Canada Contact_Position: Exploration Gamma Ray Spectrometry Expert Contact_Address: Address_Type: mailing and physical address Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E8 Country: Canada Contact_Address: Address_Type: mailing and physical address Address: 601 Booth Street Contact_Voice_Telephone: 613-992-1235 Contact_Facsimile_Telephone: 613-996-3726 Contact_Electronic_Mail_Address: kford@nrcan.gc.ca Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 722 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert Conformal Conic Lambert_Conformal_Conic: Standard_Parallel: 63.116667 Standard_Parallel: 68.633333 Longitude_of_Central_Meridian: -70.500000 Latitude_of_Projection_Origin: 63.116667 False_Easting: 0.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000512 Ordinate_Resolution: 0.000512 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_GRS_1980 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: TillGRS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: AREA Attribute: Attribute_Label: PERIMETER Attribute: Attribute_Label: TILLGRS_ Attribute: Attribute_Label: TILLGRS_ID Attribute: Attribute_Label: SAMPLE Attribute: Attribute_Label: NTS Attribute: Attribute_Label: LONGITUDE Attribute: Attribute_Label: LATITUDE Attribute: Attribute_Label: ZONE Attribute: Attribute_Label: EASTING Attribute: Attribute_Label: NORTHING Attribute: Attribute_Label: K_PCT_LGRS Attribute: Attribute_Label: EU_PPM_LGR Attribute: Attribute_Label: ETH_PPM_LG Attribute: Attribute_Label: RUT_LGRS Attribute: Attribute_Label: RUK_LGRS Attribute: Attribute_Label: RTK_LGRS Attribute: Attribute_Label: K_PCT_ICP Attribute: Attribute_Label: TH_PPM_INA Attribute: Attribute_Label: U_PPM_INAA Attribute: Attribute_Label: RUT_INAA Attribute: Attribute_Label: POLYGONID Attribute: Attribute_Label: SCALE Attribute: Attribute_Label: ANGLE Distribution_Information: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.019 Metadata_Reference_Information: Metadata_Date: 20061101 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Natural Resources Canada Contact_Person: Mike Sigouin Contact_Address: Address_Type: mailing and physical address Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-943-0738 Contact_Facsimile_Telephone: 613-952-7038 Contact_Electronic_Mail_Address: msigouin@nrcan.gc.ca Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile