{"title":"Geostandards and Geoanalytical Research","authors":"","doi":"10.1111/ggr.70024","DOIUrl":"https://doi.org/10.1111/ggr.70024","url":null,"abstract":"","PeriodicalId":12631,"journal":{"name":"Geostandards and Geoanalytical Research","volume":"49 4","pages":"915-917"},"PeriodicalIF":3.4,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Philip J. Potts, Peter C. Webb, Charles J.B. Gowing, Michael Wiedenbeck, Olgeir Sigmarsson
{"title":"Certification of Iceland Tholeiitic Basalt IAG BNA-1 Using the GeoPT Proficiency Testing Certification Protocol","authors":"Philip J. Potts, Peter C. Webb, Charles J.B. Gowing, Michael Wiedenbeck, Olgeir Sigmarsson","doi":"10.1111/ggr.70015","DOIUrl":"https://doi.org/10.1111/ggr.70015","url":null,"abstract":"<p>The certification protocol developed for the Geo<i>PT</i> proficiency testing programme was applied to the certification of Iceland Tholeiitic Basalt IAG BNA-1. Certified values for eight major element oxides and twenty-nine trace elements were reported together with fourteen indicative values. Metrological traceability was demonstrated in part by the excellent agreement between Geo<i>PT</i> assigned values and certified values for the established certified reference material BRP-1 (Basalt Ribeirão Preto), which was distributed for co-analysis with BNA-1 in Round 54 of the Geo<i>PT</i> programme. A comparison shows clear similarities, but some differences when the composition of BNA-1 was compared with values for USGS BIR-1 (Reykjavik Iceland Basalt), which originated from the same quarry near Reykjavik in Iceland. An assessment of quality factors for IAG BNA-1 shows that BNA-1 certified values are fully compatible with usage involving the assessment of data submitted by laboratories that routinely analyse silicate rocks to the Geo<i>PT</i> ‘research laboratory’ standard of performance.</p>","PeriodicalId":12631,"journal":{"name":"Geostandards and Geoanalytical Research","volume":"49 4","pages":"771-779"},"PeriodicalIF":3.4,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Piero A.B. de Sampaio, Hugo K.H. Olierook, Denis Fougerouse, Bradley J. McDonald, Ninna K. Jensen, James N. Connelly, William D.A. Rickard, David W. Saxey, Noreen J. Evans, Martin Bizzarro, Nicholas J. Gardiner, Joshua M. Garber, Luc S. Doucet, Zheng-Xiang Li
{"title":"Grey Hill Zircon – A Natural High 176Yb/177Hf Zircon Reference Material for LA-MC-ICP-MS Hf Isotope Measurement","authors":"Piero A.B. de Sampaio, Hugo K.H. Olierook, Denis Fougerouse, Bradley J. McDonald, Ninna K. Jensen, James N. Connelly, William D.A. Rickard, David W. Saxey, Noreen J. Evans, Martin Bizzarro, Nicholas J. Gardiner, Joshua M. Garber, Luc S. Doucet, Zheng-Xiang Li","doi":"10.1111/ggr.70016","DOIUrl":"https://doi.org/10.1111/ggr.70016","url":null,"abstract":"<p>Accurate measurements of Hf isotope ratios in zircon rely on adequate correction for isobaric interferences, which increase in complexity as the ratio of heavy rare earth elements (HREE) to Hf increases. Currently, synthetic high-HREE zircons are commonly used to bracket the highest naturally occurring HREE/Hf zircon grains during laser ablation-based measurement but these are in limited supply. We present results for Grey Hill zircon, a new high <sup>176</sup>Yb/<sup>177</sup>Hf zircon with a weighted mean age of 482.97 ± 0.17 Ma (2s). We show that Hf is homogeneously distributed at the microscale in Grey Hill zircon, whereas Yb is heterogeneously distributed in oscillatory- and sector-zones following observed cathodoluminescence patterns. Atom probe tomography measurements show that Hf and Yb are homogeneously distributed at the nanoscale. Chemical abrasion solution multi-collector inductively coupled plasma-mass spectrometry (CA-S-MC-ICP-MS) yielded a mean <sup>176</sup>Hf/<sup>177</sup>Hf of 0.282854 ± 0.000023 (2<i>s</i>, <i>n</i> = 15), with a correlation to <sup>176</sup>Lu/<sup>177</sup>Hf that corresponds to radiogenic ingrowth since <i>ca</i>. 483 Ma. If analyses are back-calculated to the crystallisation age, the CA-S-MC-ICP-MS data yield a <sup>176</sup>Hf/<sup>177</sup>Hf<sub>(t)</sub> of 0.282805 ± 0.000010 (2<i>s</i>), which we recommend be used as the reference ratio for Grey Hill zircon. Non-abraded, <i>in situ</i> LA-MC-ICP-MS analyses yielded results consistent with the CA-S-MC-ICP-MS mean. Importantly, LA-MC-ICP-MS analyses do not show any correlation with HREE, and there is no apparent difference in measured <sup>176</sup>Hf/<sup>177</sup>Hf between pristine and altered domains. The grains have <sup>176</sup>Yb/<sup>177</sup>Hf (0.094–0.48) and <sup>176</sup>Lu/<sup>177</sup>Hf (0.0028–0.014) ratios that are much higher than all commonly used natural reference materials. Thus, Grey Hill zircon is a useful natural reference material for LA-MC-ICP-MS Hf isotope measurement to guarantee accurate isobaric interference correction across the full spectrum of naturally occurring zircon grains. Grey Hill zircon concentrates can be requested from the authors.</p>","PeriodicalId":12631,"journal":{"name":"Geostandards and Geoanalytical Research","volume":"49 4","pages":"799-819"},"PeriodicalIF":3.4,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ggr.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145480033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Michael W. Förster, Laura M. Otter, Jochen J. Brocks, Kushani Jayasoma, Deyanira Cisneros-Lazaro, Derek Nowak, Jarosław Stolarski, Brett Knowles
{"title":"Quality Control Measures for Enhancing Confidence in Nanoscale IR Spectroscopy","authors":"Michael W. Förster, Laura M. Otter, Jochen J. Brocks, Kushani Jayasoma, Deyanira Cisneros-Lazaro, Derek Nowak, Jarosław Stolarski, Brett Knowles","doi":"10.1111/ggr.70014","DOIUrl":"https://doi.org/10.1111/ggr.70014","url":null,"abstract":"<p>Photo-induced Force Microscopy (PiFM) is a nanoanalytical, surface-sensitive new-frontier technique that provides in situ infrared spectroscopy at a spatial resolution of ~ 5 nm<sup>2</sup>, which is approximately one billion times higher than traditional FTIR. These advantages led to significant discoveries in Earth and environmental sciences, as well as related disciplines. However, the high resolution and surface sensitivity of PiFM makes it highly susceptible to surface contamination. Factors such as sample preparation, handling and storage can introduce particulate and/or molecular layer contaminants, which may interfere with data analysis and lead to misinterpretation of results. In this study, we systematically investigated common laboratory materials, including gloves, mounting materials, polishing agents and storage solutions as potential sources of particulate and molecular contaminants and compiled a library of reference spectra available to all users of nano-scale molecular analyses. Further, we determined the contaminant signatures of human skin and gloves on AFM substrates and provided recommendations for sample preparation, handling and storage as well as strategies for contamination mitigation to ensure better-informed analysis of structurally and compositionally complex geological materials. We identified molecular and particulate contaminants through their specific IR absorption bands, and provide recommendations to selectively avoid or remove them, thereby improving the reliability of nanoscale molecular analyses by PiFM, ultimately increasing confidence in new discoveries.</p>","PeriodicalId":12631,"journal":{"name":"Geostandards and Geoanalytical Research","volume":"49 4","pages":"685-703"},"PeriodicalIF":3.4,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ggr.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145480032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paolo Di Giuseppe, Simone Vezzoni, Stefano Iannini Lelarge, Andrea Rielli, Samuele Agostini, Andrea Dini
{"title":"Iron Isotope Ratios of IAEA B5 Basalt and Whole-Rock Reference Materials (JB-2, BHVO-2, AGV-1, BE-N and RGM-1) Determined by Multi-Collector Inductively Coupled Plasma-Mass Spectrometry","authors":"Paolo Di Giuseppe, Simone Vezzoni, Stefano Iannini Lelarge, Andrea Rielli, Samuele Agostini, Andrea Dini","doi":"10.1111/ggr.70017","DOIUrl":"https://doi.org/10.1111/ggr.70017","url":null,"abstract":"<p>Iron isotopes are increasingly applied in Earth science fields, including cosmochemistry, geochemistry and environmental sciences. Refining non-traditional stable isotope systematics requires well-characterised isotopic reference materials to ensure accuracy and precision. Consequently, the direct comparison of data obtained from different laboratories is a key prerequisite for establishing reliable isotopic systematics. Here, we describe a new Fe isotope measurement method using multi-collector-ICP-MS. The Fe isotope ratios of widely used geological reference materials (JB-2, BHVO-2, BE-N, AGV-1 and RGM-1) were measured and new Fe isotope values for IAEA-B5 (basalt from Mount Etna, Italy) are recommended. Anion exchange chromatography was used to separate Fe from the rest of the matrix. Mass bias was corrected using a standard-sample-standard bracketing method combined with Ni-doping. Iron isotope ratios of JB-2, BHVO-2, BE-N, AGV-1 and RGM-1 show strong agreement with published values and fall within reported analytical uncertainties. Based on these results, we validate and propose δ<sup>56</sup>Fe = 0.103 ± 0.064 (2<i>s</i>) and δ<sup>57</sup>Fe = 0.141 ± 0.068 (2<i>s</i>) as recommended values for IAEA-B5. We further advocate the IAEA-B5 as a robust and complementary reference material for analytical validation and quality control in Fe isotope studies, providing both a supplement to and an alternative for established iron isotope reference materials.</p>","PeriodicalId":12631,"journal":{"name":"Geostandards and Geoanalytical Research","volume":"49 4","pages":"901-914"},"PeriodicalIF":3.4,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ggr.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145480030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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