Pub Date : 2023-10-01DOI: 10.7185/geochemlet.2318cor
J.M. Domingos, E. Runge, C. Dreher, T.-H. Chiu, J. Shuster, S. Fischer, A. Kappler, J.-P. Duda, J. Xu, M. Mansor
{"title":"Corrigendum to “Inferred pyrite growth via the particle attachment pathway in the presence of trace metals” by Domingos et al., 2023","authors":"J.M. Domingos, E. Runge, C. Dreher, T.-H. Chiu, J. Shuster, S. Fischer, A. Kappler, J.-P. Duda, J. Xu, M. Mansor","doi":"10.7185/geochemlet.2318cor","DOIUrl":"https://doi.org/10.7185/geochemlet.2318cor","url":null,"abstract":"","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135811091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A.R. Brown, Y. Roebbert, A. Sato, M. Hada, M. Abe, S. Weyer, R. Bernier-Latmani
{"title":"Contribution of the nuclear field shift to kinetic uranium isotope fractionation","authors":"A.R. Brown, Y. Roebbert, A. Sato, M. Hada, M. Abe, S. Weyer, R. Bernier-Latmani","doi":"10.7185/geochemlet.2333","DOIUrl":"https://doi.org/10.7185/geochemlet.2333","url":null,"abstract":"","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135607201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C.L. Kirkland, T.E. Johnson, J. Gillespie, L. Martin
Analytical methods SIMS U–Pb Sample AC13 was collected by Stephen Moorbath from the University of Oxford in July 1995, from 500 metres NNW of the Acasta camp. Zircon crystals from sample AC13 were analysed for U–Th–Pb isotopes using the SHRIMP II ion probe at Curtin University following standard operating procedures (Wingate and Kirkland, 2014). The zircon surface was sputtered with a primary, mass-filtered (O2) − beam with ~ 2 nA current, focused to a ~ 15 μm spot. The mass resolution, M/ΔM, was better than 5000. Twenty-two analyses of the 91500 zircon reference material (Wiedenbeck et al., 1995) were obtained during the session, all of which indicate an external spot-to-spot (reproducibility) uncertainty of 1.33% (1σ) and a U/Pb calibration uncertainty of 0.45% (1σ). These calibration uncertainties are included in the calculated uncertainties on U/Pb* ratios and dates listed in Table S1. The OG1 zircon reference material was analysed as an unknown and yielded a weighted mean Pb/Pb age of 3458 ± 7 Ma (MSWD = 0.51, n = 5), within accepted values (Stern et al., 2009). No fractionation correction on Pb/Pb was deemed necessary. Common-Pb corrections were applied to all analyses using contemporaneous common Pb determined according to the model of Stacey and Kramers (1975) based on Pb counts. The Excel-based program Squid 2 (Ludwig, 2001) was used for data processing and data were plotted using Isoplot (Ludwig, 2003).
{"title":"Ion imaging of ancient zircon","authors":"C.L. Kirkland, T.E. Johnson, J. Gillespie, L. Martin","doi":"10.7185/geochemlet.2332","DOIUrl":"https://doi.org/10.7185/geochemlet.2332","url":null,"abstract":"Analytical methods SIMS U–Pb Sample AC13 was collected by Stephen Moorbath from the University of Oxford in July 1995, from 500 metres NNW of the Acasta camp. Zircon crystals from sample AC13 were analysed for U–Th–Pb isotopes using the SHRIMP II ion probe at Curtin University following standard operating procedures (Wingate and Kirkland, 2014). The zircon surface was sputtered with a primary, mass-filtered (O2) − beam with ~ 2 nA current, focused to a ~ 15 μm spot. The mass resolution, M/ΔM, was better than 5000. Twenty-two analyses of the 91500 zircon reference material (Wiedenbeck et al., 1995) were obtained during the session, all of which indicate an external spot-to-spot (reproducibility) uncertainty of 1.33% (1σ) and a U/Pb calibration uncertainty of 0.45% (1σ). These calibration uncertainties are included in the calculated uncertainties on U/Pb* ratios and dates listed in Table S1. The OG1 zircon reference material was analysed as an unknown and yielded a weighted mean Pb/Pb age of 3458 ± 7 Ma (MSWD = 0.51, n = 5), within accepted values (Stern et al., 2009). No fractionation correction on Pb/Pb was deemed necessary. Common-Pb corrections were applied to all analyses using contemporaneous common Pb determined according to the model of Stacey and Kramers (1975) based on Pb counts. The Excel-based program Squid 2 (Ludwig, 2001) was used for data processing and data were plotted using Isoplot (Ludwig, 2003).","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134978019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J Greer, B Zhang, D Isheim, D.N. Seidman, A. Bouvier, P.R. Heck
{"title":"4.46 Ga zircons anchor chronology of lunar magma ocean","authors":"J Greer, B Zhang, D Isheim, D.N. Seidman, A. Bouvier, P.R. Heck","doi":"10.7185/geochemlet.2334","DOIUrl":"https://doi.org/10.7185/geochemlet.2334","url":null,"abstract":"","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136054349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The direct observation and interpretation of gas hydrate decomposition with ocean depth","authors":"L. Ma, Z. Luan, Z. Du, X. Zhang, Y. Zhang","doi":"10.7185/geochemlet.2327","DOIUrl":"https://doi.org/10.7185/geochemlet.2327","url":null,"abstract":"Abstract","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45023083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sample Description Seven microinclusion-bearing fibrous diamonds from a single source in Canada were selected for the present study from a private collection of M. Schrauder (Vienna, Austria). The exact origin of these diamonds is unknown; however, based on the year of first mine production compared to when these diamonds were originally acquired (2009), potential mines are Diavik (with an emplacement age of 55‒56 Ma; Graham et al., 1999; Creaser et al., 2004), Ekati (45‒75 Ma; Lockhart et al., 2003; Creaser et al., 2004), Jericho (~172 Ma; Heaman et al., 2002), Victor (170‒180 Ma; Januszczak et al., 2013) or Snap Lake (523‒535 Ma; Agashev et al., 2001; Heaman et al., 2004). The diamonds are all 3 to 4 mm in diameter, vary in weight between 91 to 116 mg, have cubic morphology, and are white to dark grey in colour. Five of the diamonds are fully fibrous whereas two (515 and 516) have a fibrous coat overgrowth on a small microinclusion-free octahedral core (<800 μm across). Each diamond was laser-cut twice to create two parallel side sections and a central thin plate that was polished on both sides; all parts were then cleaned ultrasonically in a mixture of concentrated HF (29 N) and HNO3 (16 N) for >2 h and washed with ethanol and distilled water.
{"title":"Sr-Nd-Pb isotopes of fluids in diamond record two-stage modification of the continental lithosphere","authors":"Y Weiss, J.M. Koornneef, G.R. Davies","doi":"10.7185/geochemlet.2329","DOIUrl":"https://doi.org/10.7185/geochemlet.2329","url":null,"abstract":"Sample Description Seven microinclusion-bearing fibrous diamonds from a single source in Canada were selected for the present study from a private collection of M. Schrauder (Vienna, Austria). The exact origin of these diamonds is unknown; however, based on the year of first mine production compared to when these diamonds were originally acquired (2009), potential mines are Diavik (with an emplacement age of 55‒56 Ma; Graham et al., 1999; Creaser et al., 2004), Ekati (45‒75 Ma; Lockhart et al., 2003; Creaser et al., 2004), Jericho (~172 Ma; Heaman et al., 2002), Victor (170‒180 Ma; Januszczak et al., 2013) or Snap Lake (523‒535 Ma; Agashev et al., 2001; Heaman et al., 2004). The diamonds are all 3 to 4 mm in diameter, vary in weight between 91 to 116 mg, have cubic morphology, and are white to dark grey in colour. Five of the diamonds are fully fibrous whereas two (515 and 516) have a fibrous coat overgrowth on a small microinclusion-free octahedral core (<800 μm across). Each diamond was laser-cut twice to create two parallel side sections and a central thin plate that was polished on both sides; all parts were then cleaned ultrasonically in a mixture of concentrated HF (29 N) and HNO3 (16 N) for >2 h and washed with ethanol and distilled water.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135389325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I.V. Sanislav, R. Mathur, P. Rea, P.H.G.M. Dirks, B. Mahan, L. Godfrey, H. Degeling
Ninety chalcopyrite samples were collected from drill holes across well-known ore bodies and the low-grade envelope around the Mt Isa deposit. The textural position of chalcopyrite grains targeted for analysis were determined before the sulphides were analysed, and sulphides in similar textural positions were compared. Full log and assay data were available for all drill holes. The sampling strategy involved: to sample across the ore body from the core of the ore body to the most distal parts that contain chalcopyrite and to systematically collect samples in relationships with major structures, to sample within the same stratigraphic horizon, to sample across the entire deposit. Chalcopyrite grains were handpicked from each sample at the Juniata College, USA and sampled with a drill dremel tool. Between 10 to 50 mg of chalcopyrite was dissolved in 4 ml of ultrapure, heated, aqua regia overnight. Due to the fact copper is a dominant ion in the mineral, no column chemistry was conducted on the chalcopyrite samples as demonstrated in (Mathur et al., 2005; Zhu et al., 2000; Zhang et al., 2020). Isotope analyses were carried out on MCICP-MS instruments at various facilities (Penn State University, Washington State University and Rutgers University). Cu isotope values were corrected for mass bias using traditional standard–sample–standard bracketing with the NISTSRM976 standard reference material and data are presented in the traditional delta notation (in per mil) compared to this standard. The instruments were in wet-plasma mode and the solutions were measured at 200 ng/g. Samples and reference materials matched to within 30 % of the Cu signal. QA/QC for the results was monitored using an in-house USA coin (1838 USA CENT δCu = 0.01 ± 0.06 ‰ (n=39 combined from all three locations) and BVHO-2 with values overlapping those reported in the literature.
{"title":"A magmatic copper and fluid source for the sediment-hosted Mount Isa deposit","authors":"I.V. Sanislav, R. Mathur, P. Rea, P.H.G.M. Dirks, B. Mahan, L. Godfrey, H. Degeling","doi":"10.7185/geochemlet.2330","DOIUrl":"https://doi.org/10.7185/geochemlet.2330","url":null,"abstract":"Ninety chalcopyrite samples were collected from drill holes across well-known ore bodies and the low-grade envelope around the Mt Isa deposit. The textural position of chalcopyrite grains targeted for analysis were determined before the sulphides were analysed, and sulphides in similar textural positions were compared. Full log and assay data were available for all drill holes. The sampling strategy involved: to sample across the ore body from the core of the ore body to the most distal parts that contain chalcopyrite and to systematically collect samples in relationships with major structures, to sample within the same stratigraphic horizon, to sample across the entire deposit. Chalcopyrite grains were handpicked from each sample at the Juniata College, USA and sampled with a drill dremel tool. Between 10 to 50 mg of chalcopyrite was dissolved in 4 ml of ultrapure, heated, aqua regia overnight. Due to the fact copper is a dominant ion in the mineral, no column chemistry was conducted on the chalcopyrite samples as demonstrated in (Mathur et al., 2005; Zhu et al., 2000; Zhang et al., 2020). Isotope analyses were carried out on MCICP-MS instruments at various facilities (Penn State University, Washington State University and Rutgers University). Cu isotope values were corrected for mass bias using traditional standard–sample–standard bracketing with the NISTSRM976 standard reference material and data are presented in the traditional delta notation (in per mil) compared to this standard. The instruments were in wet-plasma mode and the solutions were measured at 200 ng/g. Samples and reference materials matched to within 30 % of the Cu signal. QA/QC for the results was monitored using an in-house USA coin (1838 USA CENT δCu = 0.01 ± 0.06 ‰ (n=39 combined from all three locations) and BVHO-2 with values overlapping those reported in the literature.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135427674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Korolev, M. Kopylova, E. Dubinina, R. A. Stern, A. Methods
{"title":"Contrasting oxygen isotopes in garnet from diamondiferous and barren eclogitic parageneses","authors":"N. Korolev, M. Kopylova, E. Dubinina, R. A. Stern, A. Methods","doi":"10.7185/geochemlet.2328","DOIUrl":"https://doi.org/10.7185/geochemlet.2328","url":null,"abstract":"","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46558220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Methods Previous Crustal Growth Estimates Previous crustal growth estimates calculated by Dhuime et al., (2012; 2017) are here collectively referred to as D27 and these widely used crustal growth curves are based on a modification of the calculations of Belusova et al. (2010). In the calculation scheme used by D27, an age spectrum was obtained by compiling zircon Hfisotope depleted mantle model extraction ages. Each individual zircon U-Pb + Hf isotope data point was used to calculate a depleted mantle model extraction age, and these model ages were binned across geologic time. This age distribution was corrected for reworking using a modification of the methods employed by (Belousova et al., 2010). Instead of considering only zircon Hf isotope data, D27 used zircon O-isotope data to identify crustal reworking signals in the zircon record where zircon oxygen isotope values above the mantle range were considered to be evidence of a reworking signal. A curve proposed to be the crustal growth rate was calculated by determining the relationship between crustal reworking – identified using zircon Hf isotope model ages – and juvenile crustal growth – identified using O-isotope ratios. These calculations are replicated in Supplementary Table S-2. However, there is a flaw in the calculations employed in the D27 work (as pointed out by (Korenaga, 2018)).
{"title":"A whole-lithosphere view of continental growth","authors":"J. Reimink, J. Davies, Jeff Moyen, D. Pearson","doi":"10.7185/geochemlet.2324","DOIUrl":"https://doi.org/10.7185/geochemlet.2324","url":null,"abstract":"Methods Previous Crustal Growth Estimates Previous crustal growth estimates calculated by Dhuime et al., (2012; 2017) are here collectively referred to as D27 and these widely used crustal growth curves are based on a modification of the calculations of Belusova et al. (2010). In the calculation scheme used by D27, an age spectrum was obtained by compiling zircon Hfisotope depleted mantle model extraction ages. Each individual zircon U-Pb + Hf isotope data point was used to calculate a depleted mantle model extraction age, and these model ages were binned across geologic time. This age distribution was corrected for reworking using a modification of the methods employed by (Belousova et al., 2010). Instead of considering only zircon Hf isotope data, D27 used zircon O-isotope data to identify crustal reworking signals in the zircon record where zircon oxygen isotope values above the mantle range were considered to be evidence of a reworking signal. A curve proposed to be the crustal growth rate was calculated by determining the relationship between crustal reworking – identified using zircon Hf isotope model ages – and juvenile crustal growth – identified using O-isotope ratios. These calculations are replicated in Supplementary Table S-2. However, there is a flaw in the calculations employed in the D27 work (as pointed out by (Korenaga, 2018)).","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44306107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J.P.H. Perez, M. Okhrymenko, R. Blukis, V. Roddatis, S. Mayanna, J.F.W. Mosselmans, L.G. Benning
{"title":"Vivianite-parasymplesite solid solution: A sink for arsenic in ferruginous environments?","authors":"J.P.H. Perez, M. Okhrymenko, R. Blukis, V. Roddatis, S. Mayanna, J.F.W. Mosselmans, L.G. Benning","doi":"10.7185/geochemlet.2325","DOIUrl":"https://doi.org/10.7185/geochemlet.2325","url":null,"abstract":"","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136266526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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