c28966cc-e4f8-49d7-9f39-16e2e7ef08b5_source eng; USA utf8 dataset Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact 2016-05-12 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Zircon U-Pb age data, Ray Mountains area, Bettles Quadrangle, Alaska 2016-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Tuzzolino, A.L. originator O'Sullivan, P.B. originator Freeman, L.K. originator Newberry, R.J. originator http://dx.doi.org/10.14509/29662 REPORT AND DIGITAL DATA Raw Data File RDF 2016-7 19 p. 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. 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. 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. completed Alaska Division of Geological & Geophysical Surveys GIS Manager 907-451-5020 3354 College Rd Fairbanks AK 99709-3707 USA dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact notPlanned Age Dates Analyses Analyses and Sampling Analytical Lab Results Analytical Results Bedrock Bedrock Geology Geochronology Geology Igneous Rocks Lab Methods Metals Mineral Assessment Mineral Deposit Mineral Resources Minerals Plutonic Polymetallic Rare Earth Elements Sample Location Strategic and Critical Minerals Assessment Project Tin U-Pb Zircon theme Alaska Division of Geological & Geophysical Surveys Bettles Quadrangle Ray Mountains place Alaska Division of Geological & Geophysical Surveys Hot Springs Pluton Kanuti Pluton No Name Creek Pluton Ray River Pluton stratum Alaska Division of Geological & Geophysical Surveys Cretaceous temporal 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 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. otherRestrictions 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. otherRestrictions 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). 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 2013-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher 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 originator http://dx.doi.org/10.14509/25386 Raw Data File RDF 2013-5 4 p crossReference 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 2014-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Tuzzolino, A.L. originator Freeman, L.K. originator Newberry, R.J. originator http://dx.doi.org/10.14509/27325 Raw Data File RDF 2014-17 3 p crossReference vector eng; USA geoscientificInformation -150.502600 -150.047000 66.054390 66.511910 2012-01-01 2016-01-01 >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. true ASCII tabular files unknown Alaska Division of Geological & Geophysical Surveys (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. distributor Contact DGGS for current pricing Free download http://dx.doi.org/10.14509/29662 ASCII tabular files CSDGM IMPORT ERROR: No digtinfo/formcont information dataset 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. This data release is complete. This data release is complete. not applicable This lineage was generated by the FGDC CSDGM to 19139 transformation 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. 2013-01-01T00:00:00 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. 2014-01-01T00:00:00 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. 2015-01-01T00:00:00 Source Contribution: fieldworkSource Type: paper Tin reconnaissance of the Kanuti and Hodzana Rivers uplands, central Alaska 1986-01-01 publication U.S. Bureau of Mines United States publisher Barker, J.C. originator Foley, J.Y. originator http://dggs.alaska.gov/pubs/id/21287 Information Circular IC 9104 27 p 1986-01-01 Source Contribution: fieldworkSource Type: paper Contrasting Plutonic Rock Suites of the Yukon-Koyukuk basin and the Ruby Geanticline, Alaska 1989-01-01 publication American Geophysical Union USA publisher Miller, T.P. originator null v. 94, no. B11 1989-01-01 otherRestrictions 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. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact