Lubbers, JordanLoewen, Matthew2025csvTechniques and MethodsTM 1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys20 phttps://doi.org/10.14509/31471Glass laser ablation-inductively coupled plasma-mass spectrometry analysis methods, precision, and accuracy data for tephra studies in Alaska, Techniques and Methods 1, reports the analytical conditions, standard reference material (SRM) results, and preferred post-processing methodologies for laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) measurements supporting tephra studies in Alaska between 2018 and 2024. We evaluate the long-term accuracy and precision of our methodologies by comparing our calculated SRM concentrations to the Geological and Environmental Reference Materials database (GeoReM) preferred concentration values for the following SRMs: BCR-2G, BHVO-2G, ATHO-G, NIST-612, GSD-1G, and GSE-1G. We show that our LA-ICP-MS methodologies produce accurate and consistent measurements across numerous analytical sessions, even when instrumentation changed. Overall, these results indicate that Alaska tephra matrix glass measurements, like SRM measurements, are accurate, precise, and comparable between analytical sessions. These data and report are available from the DGGS website: http://doi.org/10.14509/31471.This work allows us to better correlate tephra units from Alaska volcanoes throughout the Alaska-Aleutian arc, ultimately enhancing our understanding of spatiotemporal patterns of volcanism in the region. This enhanced understanding will aid in refining volcanic hazard classification and response strategies.>tm001_icp-ms: Individual secondary standard reference material (SRM) analyses, and summary statistics for SRMs measured during tephra matrix glass laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analytical sessions.20242025ground conditionCompleteNone planned-178.817961-104.06029171.27768443.359849ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAnalysesAnalyses and SamplingAnalytical Lab ResultsAnalytical ResultsDGGSHazardsLaser AblationMethodsReference InformationTephraVolcanicVolcanic ArcVolcanic AshVolcanic RocksVolcanoesVolcanologyAlaska Division of Geological & Geophysical SurveysAlaskaAleutian IslandsAleutian PeninsulaThis 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).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.Alaska Division of Geological & Geophysical SurveysGIS Managermailing and physical

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FairbanksAK99709-3707USA907-451-5020dggsgis@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysWe would like to acknowledge and express our gratitude to Adam Kent, Chris Russo, Andy Ungerer, and Chuck Lewis for their mentorship and numerous discussions about LA-ICP-MS methodologies over the years. This article has been peer-reviewed and approved for publication consistent with USGS Fundamental Science Practices (pubs.usgs.gov/circ/1367). We appreciate reviews provided by Chris Russo and Jay Thompson and metadata review by Simone Montayne. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Cameron, C.E.Crass, S.W.AVO Staff2022Digital Data SeriesDDS 20Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/30901Cameron, C.E.Mulliken, K.M.Crass, S.W.Schaefer, J.R.Wallace, K.L.2019Digital Data SeriesDDS 8 v. 2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys22 phttps://doi.org/10.14509/30058Cameron, C.E.Crass, S.W.AVO Staff2022Digital Data SeriesDDS 20Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/30901Cameron, C.E.Mulliken, K.M.Crass, S.W.Schaefer, J.R.Wallace, K.L.2019Digital Data SeriesDDS 8 v. 2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys22 phttps://doi.org/10.14509/30058Loewen, M.W.Wallace, K.L.Lubbers, JordanRuth, DawnIzbekov, P.E.Larsen, J.F.Graham, Nathan2023Miscellaneous PublicationMP 174Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys20 phttps://doi.org/10.14509/31045Nye, C.J.Beget, J.E.Layer, P.W.Mangan, M.T.McConnell, V.S.McGimsey, R.G.Miller, T.P.Moore, R.B.Stelling, P.L.2018Raw Data FileRDF 2018-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys29 phttps://doi.org/10.14509/29843Loewen, M.W.Wallace, K.L.Lubbers, JordanRuth, DawnIzbekov, P.E.Larsen, J.F.Graham, Nathan2023Miscellaneous PublicationMP 174Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys20 phttps://doi.org/10.14509/31045Nye, C.J.Beget, J.E.Layer, P.W.Mangan, M.T.McConnell, V.S.McGimsey, R.G.Miller, T.P.Moore, R.B.Stelling, P.L.2018Raw Data FileRDF 2018-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys29 phttps://doi.org/10.14509/29843The accompanying report and data tables provide a comprehensive discussion of processing methods. When applicable, errors are reported in the data tables. These data are being released in the DGGS Techniques and Methods series, which consists of content that describes approved techniques and methods related to the collection, storage, visualization, analysis, or interpretation of scientific data. May include items such as data standards, data collection guidelines, data creation guidelines, manuals, process documentation, analytical models, or software documentation. These reports may or may not have been reviewed for technical merit.Not applicableThis data release is complete.Not applicableAnalytical methods - Unknown tephra samples were mounted with epoxy in 25 mm-diameter rounds (hereafter called round mounts), progressively polished with diamond grit (to 1 um) with a finishing polish of either colloidal silica (to 0.05 µm) or alumina suspension (0.1 um). Carbon coats, added previously for EPMA analysis, were removed prior to analysis using an alumina suspension polish. All analyses were performed at the W.M. Keck Collaboratory for Plasma Spectrometry at Oregon State University in Corvallis, Oregon. During this comparison's timeframe, multiple laser ablation-quadrupole mass spectrometer combinations were used, ultimately leading to the analytical conditions outlined in table 1 of the accompanying report. Total ablation time for all measurements is approximately 20-30 seconds, excluding a 20-30 second delay prior to ablation that is used to establish mass spectrometer background counts and a 10-30 second washout period following ablation and prior to starting data collection on the next sample. Prior to most analyses (apart from those analyzed in May and October 2022), analyzed spots were cleaned using 2-4 pre-ablation cleaning pulses at a larger diameter spot size. Elemental concentrations for all measurements were calculated from raw signals using the equations outlined in Longerich and others (1996) implemented by the Python package lasertram (Lubbers, 2024). All analytes are collected using a 10 ms dwell time, and 29Si was used as the internal standard. SiO2 concentrations for all SRM measurements are the preferred GeoReM values (Jochum and others, 2007a, version 8). GSE-1G, a synthetic glass doped with ~100s ppm trace elements (Guillong and others, 2005), was used as the primary calibration standard for analyses between 2018 and 2022, and GSD-1G (similar to GSE-1G but doped with ~10s ppm trace elements) was used as the primary calibration standard from 2023 to 2024. See the accompanying report and data tables for additional details.2024point0.00000010.0000001decimal degreesNAD83GRS 806378137298.257222101tm001_icp-ms.csv, tm001_icp-ms_data_dictionary.csvIndividual secondary standard reference material (SRM) analyses, and summary statistics for SRMs measured during tephra matrix glass laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analytical sessions.DGGS, AVOtm001_icp-msATHO_G_accuracy_statsDetailed statistics (count, mean, standard deviation, min, quartiles, max, median, skew, kurtosis) for all ATHO-G accuracy values.this reporttm001_icp_ms_data_dictionaryBCR_2G_accuracy_statsDetailed statistics (count, mean, standard deviation, min, quartiles, max, median, skew, kurtosis) for all BCR-2G accuracy values.this reporttm001_icp_ms_data_dictionaryBHVO_2G_accuracy_statsDetailed statistics (count, mean, standard deviation, min, quartiles, max, median, skew, kurtosis) for all BHVO-2G accuracy values.this reporttm001_icp_ms_data_dictionaryConditionsAnalytical conditions for each unique session (i.e., week-long series of analyses). Uses MethodID column to link to SRM concentrations and SRM accuracies sheets.this reporttm001_icp_ms_data_dictionaryGEOREMTable of GeoReM preferred values for all SRMs analyzed in this report used to calculate concentrations.this reporttm001_icp_ms_data_dictionaryGSD_1G_accuracy_statsDetailed statistics (count, mean, standard deviation, min, quartiles, max, median, skew, kurtosis) for all GSD-1G accuracy values.this reporttm001_icp_ms_data_dictionaryNIST_612_accuracy_statsDetailed statistics (count, mean, standard deviation, min, quartiles, max, median, skew, kurtosis) for all National Institute of Standards and Technology (NIST)-612 accuracy values.this reporttm001_icp_ms_data_dictionarySRM_accuraciesCalculated accuracies (100 x measured/accepted values) for all concentrations.this reporttm001_icp_ms_data_dictionarySRM_accuracy_statsTable of mean accuracy and standard deviation values for each SRMthis reporttm001_icp_ms_data_dictionarySRM_concentrationsCalculated concentrations for all standard reference material (SRM) analyses used in this report.this reporttm001_icp_ms_data_dictionaryState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveysmailing and physical

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FairbanksAK99709-3707USA907-451-5020FGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, 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.http://www.dggs.alaska.gov/metadata/dggs.extdggs metadata extensions