Identification_Information: Citation: Citation_Information: Originator: Tuzzolino, A.L. Originator: O'Sullivan, P.B. Originator: Freeman, L.K. Originator: Newberry, R.J. Publication_Date: 2016 Title: Zircon U-Pb age data, Ray Mountains area, Bettles Quadrangle, Alaska Geospatial_Data_Presentation_Form: report and digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-7 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 19 p. Online_Linkage: http://dx.doi.org/10.14509/29662 Description: Abstract: U-Pb analyses were performed on igneous rocks from the Ray Mountains area of west-central Alaska. These new age analyses will allow us to better evaluate the geochronology of the granitic rocks that are the apparent source of the alluvial REE and tin resources. The plutonic samples have ages ranging from 98.0 +/- 0.9 Ma to 111.6 +/- 1.0 Ma. The sample location coordinates and analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. Purpose: DGGS conducted a multi-year project, from 2012 through 2013, to study the geology and economic potential of rare-earth elements (REE) and other metals in the Ray Mountains in the Beaver, Bettles, Livengood, and Tanana quadrangles. To better understand the granitic rocks that are associated with REE and tin-polymetallic occurrences in the area, four samples were collected for U-Pb geochronologic analyses. These new age analyses will allow us to better evaluate the geochronology of the granitic rocks that are the apparent source of the alluvial REE and tin resources. Supplemental_Information: >border: Outline of the study area. >geochron-data: geochronology lab files and applicable documentation. >geochron-summary: Identification numbers, coordinates, sample descriptions, and summary ages of each sample. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2012 Ending_Date: 2016 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -150.502600 East_Bounding_Coordinate: -150.047000 North_Bounding_Coordinate: 66.511910 South_Bounding_Coordinate: 66.054390 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Age Dates Theme_Keyword: Analyses Theme_Keyword: Analyses and Sampling Theme_Keyword: Analytical Lab Results Theme_Keyword: Analytical Results Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Geochronology Theme_Keyword: Geology Theme_Keyword: Igneous Rocks Theme_Keyword: Lab Methods Theme_Keyword: Metals Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Plutonic Theme_Keyword: Polymetallic Theme_Keyword: Rare Earth Elements Theme_Keyword: Sample Location Theme_Keyword: Strategic and Critical Minerals Assessment Project Theme_Keyword: Tin Theme_Keyword: U-Pb Theme_Keyword: Zircon Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Bettles Quadrangle Place_Keyword: Ray Mountains Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Hot Springs Pluton Stratum_Keyword: Kanuti Pluton Stratum_Keyword: No Name Creek Pluton Stratum_Keyword: Ray River Pluton Temporal: Temporal_Keyword_Thesaurus: Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Temporal_Keyword: Cretaceous Access_Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: GIS Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Rd City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Contact_Electronic_Mail_Address: dggsgis@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: This project was funded by the Alaska State Legislature through the Strategic and Critical Minerals Assessment project, a constituent of the Alaska Airborne Geophysical/Geological Mineral Inventory program. Samples in this report were collected by Rainer Newberry, Amy Tuzzolino, and Colby Wright of the University of Alaska Fairbanks. Margaret Donelick (A2Z) provided technical assistance with sample preparation; Paul O'Sullivan and Ray Donelick (A2Z), as well as Rainer Newberry and Alicja Wypych (DGGS), provided assistance with LA-ICP-MS data interpretation. Cross_Reference: Citation_Information: Originator: Bachmann, E.N. Originator: Blessington, M.J. Originator: Freeman, L.K. Originator: Newberry, R.J. Originator: Tuzzolino, A.L. Originator: Wright, T.C. Originator: Wylie, William Publication_Date: 2013 Title: Geochemical major-oxide, minor-oxide, trace-element, and rare-earth-element data from rocks and stream sediments collected in 2012 in the Ray Mountains area, Beaver, Bettles, Livengood, and Tanana quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2013-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://dx.doi.org/10.14509/25386 Cross_Reference: Citation_Information: Originator: Tuzzolino, A.L. Originator: Freeman, L.K. Originator: Newberry, R.J. Publication_Date: 2014 Title: Geochemical major-oxide, minor-oxide, trace-element, and rare-earth-element data from rock samples collected in 2013 in the Ray Mountains area, Bettles A-1 and A-6 quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2014-17 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://dx.doi.org/10.14509/27325 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This data is being released in the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been reviewed for technical content or for conformity to the editorial standards of DGGS. Questions regarding the accuracy of information in the the A2Z data files can be best answered by the originating lab. Logical_Consistency_Report: not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Locations were recorded using handheld, WAAS-enabled GPS devices. WAAS-enabled GPS devices have a reported error of about 1 m (NSTB/WAAS T&E Team, 2006). Depending on degradation of the WAAS and GPS signals, the horizontal position error of sample locations in this report is in the range of 1-10 m. The originating coordinate system for samples collected in 2012 (2012CW033A, 2012RN364A and 2012RN418A) was NAD27, UTM zone 5. Sample 2013AT135A was collected using WGS1984 Web Mercator Auxiliary Sphere coordinate system as specified by the settings of the collectors used. To provide a consistent coordinate system for all samples, all location coordinates of the samples collected in 2012 were transformed to WGS1984 Web Mercator Auxiliary Sphere using NAD_1927_To_NAD_1983_Alaska+WGS_1984_(ITRF00)_To_NAD_1983 transformation. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Barker, J.C. Originator: Foley, J.Y. Publication_Date: 1986 Title: Tin reconnaissance of the Kanuti and Hodzana Rivers uplands, central Alaska Series_Information: Series_Name: Information Circular Issue_Identification: IC 9104 Publication_Information: Publication_Place: United States Publisher: U.S. Bureau of Mines Other_Citation_Details: 27 p Online_Linkage: http://dggs.alaska.gov/pubs/id/21287 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1986 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Barker, J.C. and Foley, J.Y., 1986 Source_Contribution: fieldwork Source_Information: Source_Citation: Citation_Information: Originator: Miller, T.P. Publication_Date: 1989 Title: Contrasting Plutonic Rock Suites of the Yukon-Koyukuk basin and the Ruby Geanticline, Alaska Series_Information: Series_Name: null Issue_Identification: v. 94, no. B11 Publication_Information: Publication_Place: USA Publisher: American Geophysical Union Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1989 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Miller, T.P., 1989 Source_Contribution: fieldwork Process_Step: Process_Description: Fieldwork - DGGS field geologists collected rock samples from the surface or within 0.5 m of the surface. Care was taken to collect fresh, unweathered rock samples representative of igneous rock types in the map area. Locations were recorded using handheld, WAAS-enabled GPS devices. WAAS-enabled GPS devices have a reported error of about 1 m. Depending on degradation of the WAAS and GPS signals, the horizontal position error of sample locations in this report is in the range of 1-10 m. The originating coordinate system for samples collected in 2012 (2012CW033A, 2012RN364A and 2012RN418A) was NAD27, UTM zone 5. Sample 2013AT135A was collected using WGS1984 Web Mercator Auxiliary Sphere coordinate system as specified by the settings of the collectors used. To provide a consistent coordinate system for all samples, all location coordinates of the samples collected in 2012 were transformed to WGS1984 Web Mercator Auxiliary Sphere using NAD_1927_To_NAD_1983_Alaska+WGS_1984_(ITRF00)_To_NAD_1983 transformation. Source_Used_Citation_Abbreviation: Barker, J.C. and Foley, J.Y., 1986 Source_Used_Citation_Abbreviation: Miller, T.P., 1989 Process_Date: 2013 Process_Step: Process_Description: Analytical methods - DGGS submitted selected rock samples to A2Z in 2014. Paul O'Sullivan directed the processing and analyses of the samples in the A2Z laboratory in Viola, Idaho, where laser-ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses were performed on an Agilent 7700x quadrapole mass spectrometer attached to a Resonetics RESOlution M50 Excimer laser. Process_Date: 2014 Process_Step: Process_Description: U-pb data analysis - The raw data received from A2Z were reviewed and processed at DGGS. First, the failed and peak-background-corrected (pbc) analyses were excluded from the age calculations. These initial criteria are noted in the accompanying data tables for individual samples. Next, the analyses for each sample were plotted on concordia plots using Isoplot v. 3.7. In two cases, samples 2013AT135A and 2012RN418A, the datasets yielded poorly defined chords, with mid-Cretaceous lower intercepts and early Paleozoic to late Proterozoic upper intercepts. The data quality are not sufficient to use the ages so defined, but they do indicate a small amount of contamination from older, inherited zircon. To further reduce the data, the relative 206Pb/238U age error was calculated using the 206Pb/238U age and the quoted error (2sigma). All analyses with greater than 10 percent relative error were excluded. The excluded data consistently included those samples with anomalously old ages. Histograms of 206Pb/238U ages were constructed to identify age populations well outside of the means. For sample 2012RN418A, a single, anomalously old age was excluded. The mean error-weighted ages for the remaining 206Pb/238U ages were calculated. Next, the percent deviation from the concordia was calculated. The equation that was used calculates the extent that the measured 207Pb/235U deviates from the concordia, assuming the measured 206Pb/238U ratio lies on the concordia. In several cases, data that plots increasingly farther from the concordia gives increasingly older ages, again indicating a physical mixing of Pb and U from early Paleozoic to late Proterozoic and from Cretaceous zircon. Following the elimination of data deviating more than 2-3 percent from the concordia, a mean concordia age was calculated using Isoplot software. In general, the mean 206Pb/238U age and the mean concordia age are indistinguishable, within error, with a smaller error for the concordia age. The authors prefer the resulting mean concordia age, as generally having smaller error and fewer inherited components. Process_Date: 2015 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: World Geodetic System of 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: border Entity_Type_Label: rdf2016-7-border.shp Entity_Type_Definition: Outline of the study area. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: geochron-data Entity_Type_Label: rdf2016-7-geochron-data Entity_Type_Definition: Geochronology lab files and applicable documentation. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: geochron-summary Entity_Type_Label: rdf2016-7-geochron-summary.csv Entity_Type_Definition: Identification numbers, coordinates, sample descriptions, and summary ages of each sample. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Attribute: Attribute_Label: SAMPLE Attribute_Definition: Label assigned in the field to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Generic example of a sample identifier: YYYYAAA9999X: YYYY= four digits of year, AAA=geologist's initials (one to three characters), 999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database. Attribute: Attribute_Label: LAB_SAMPLE_NUMBER Attribute_Definition: Label used by the lab to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Unrepresentable_Domain: The lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided to the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number. Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude, WGS84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 66.05439 Range_Domain_Maximum: 66.51191 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LONGITUDE Attribute_Definition: Longitude, WGS84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -150.5026 Range_Domain_Maximum: -150.047 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: MAP_UNIT Attribute_Definition: The type of rock that was dated. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: The rock we sampled were collected from: Kgr - Kanuti Pluton, Kgr - Hot Springs Pluton, Kgr - Ray River Pluton, and Kgr - No Name Creek Pluton units. Attribute: Attribute_Label: DESCRIPTION Attribute_Definition: Description of the sample Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: A brief sample and/or station description. Attribute: Attribute_Label: NUM_MEASUREMENTS_USED_WMEAN_AGE Attribute_Definition: Number of measurements used for calculating the weighted mean age. Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 46 Range_Domain_Maximum: 55 Attribute: Attribute_Label: NUM_MEASUREMENTS_USED_MEAN_CONCORDIA_AGE Attribute_Definition: Number of measurements used for calculating the mean concordia age. Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 17 Range_Domain_Maximum: 26 Attribute: Attribute_Label: TOTAL_MEASUREMENTS Attribute_Definition: Total number of measurements. Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 60 Range_Domain_Maximum: 60 Attribute: Attribute_Label: WMEAN_AGE_MA Attribute_Definition: Weighted mean age, in millions of years (Ma). Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 98.6 Range_Domain_Maximum: 111.7 Attribute_Units_of_Measure: Ma Attribute: Attribute_Label: 2_SD_WMEAN_AGE Attribute_Definition: 2-sigma standard deviation on the weighted mean age. Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 1.3 Attribute: Attribute_Label: MEAN_CONCORDIA_AGE_MA Attribute_Definition: Mean concordia age, in millions of years (Ma). Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 98 Range_Domain_Maximum: 111.6 Attribute_Units_of_Measure: Ma Attribute: Attribute_Label: 2_SD_MEAN_CONCORDIA_AGE Attribute_Definition: 2-sigma standard deviation on the mean concordia age. Attribute_Definition_Source: Apatite to Zircon, Inc. (A2Z) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.9 Range_Domain_Maximum: 1.3 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: RDF 2016-7 Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII tabular files Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/29662 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20160512 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions