{"title":"石榴石-正辉石-橄榄石氧压计的误差","authors":"Chun-Ming Wu, Hui C.G. Zhang","doi":"10.1016/j.lithos.2025.108212","DOIUrl":null,"url":null,"abstract":"<div><div>The errors in rebuilding the experimental oxygen fugacity (expressed as its common logarithm, log<em>f</em>O<sub>2</sub>) of the Stagno et al. (2013, <em>Nature</em>, 493: 84–88) garnet-orthopyroxene-olivine oxybarometer are within ±1.2 log units and this oxybarometer is relatively the most precise one among the six different versions, although experimental data are not sufficient. If we adopt ferric iron contents of the related phases estimated by charge balance method, the computed log<em>f</em>O<sub>2</sub> values were erroneously increased to > + 0.5 log units for all the oxybarometers compared to those determined by direct experimental measuring methods of ferric iron contents. Input pressure-temperature (<em>P-T</em>) errors of +3 kbar/+70 °C or − 3 kbar/−70 °C may propagate to log<em>f</em>O<sub>2</sub> errors of +0.48 ∼ +1.60 log units or − 0.52 ∼ −1.31 log units, respectively, for the oxybarometers. Application of the garnet-orthopyroxene-olivine oxybarometers does need direct measurement of ferric contents of the phases, such as Mössbauer spectroscopy, synchrotron Fe-edge X-ray absorption near edge structure spectroscopy (XANES) or flank method.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"514 ","pages":"Article 108212"},"PeriodicalIF":2.5000,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Errors of the garnet-orthopyroxene-olivine oxybarometers\",\"authors\":\"Chun-Ming Wu, Hui C.G. Zhang\",\"doi\":\"10.1016/j.lithos.2025.108212\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The errors in rebuilding the experimental oxygen fugacity (expressed as its common logarithm, log<em>f</em>O<sub>2</sub>) of the Stagno et al. (2013, <em>Nature</em>, 493: 84–88) garnet-orthopyroxene-olivine oxybarometer are within ±1.2 log units and this oxybarometer is relatively the most precise one among the six different versions, although experimental data are not sufficient. If we adopt ferric iron contents of the related phases estimated by charge balance method, the computed log<em>f</em>O<sub>2</sub> values were erroneously increased to > + 0.5 log units for all the oxybarometers compared to those determined by direct experimental measuring methods of ferric iron contents. Input pressure-temperature (<em>P-T</em>) errors of +3 kbar/+70 °C or − 3 kbar/−70 °C may propagate to log<em>f</em>O<sub>2</sub> errors of +0.48 ∼ +1.60 log units or − 0.52 ∼ −1.31 log units, respectively, for the oxybarometers. Application of the garnet-orthopyroxene-olivine oxybarometers does need direct measurement of ferric contents of the phases, such as Mössbauer spectroscopy, synchrotron Fe-edge X-ray absorption near edge structure spectroscopy (XANES) or flank method.</div></div>\",\"PeriodicalId\":18070,\"journal\":{\"name\":\"Lithos\",\"volume\":\"514 \",\"pages\":\"Article 108212\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Lithos\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0024493725002713\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Lithos","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0024493725002713","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Errors of the garnet-orthopyroxene-olivine oxybarometers
The errors in rebuilding the experimental oxygen fugacity (expressed as its common logarithm, logfO2) of the Stagno et al. (2013, Nature, 493: 84–88) garnet-orthopyroxene-olivine oxybarometer are within ±1.2 log units and this oxybarometer is relatively the most precise one among the six different versions, although experimental data are not sufficient. If we adopt ferric iron contents of the related phases estimated by charge balance method, the computed logfO2 values were erroneously increased to > + 0.5 log units for all the oxybarometers compared to those determined by direct experimental measuring methods of ferric iron contents. Input pressure-temperature (P-T) errors of +3 kbar/+70 °C or − 3 kbar/−70 °C may propagate to logfO2 errors of +0.48 ∼ +1.60 log units or − 0.52 ∼ −1.31 log units, respectively, for the oxybarometers. Application of the garnet-orthopyroxene-olivine oxybarometers does need direct measurement of ferric contents of the phases, such as Mössbauer spectroscopy, synchrotron Fe-edge X-ray absorption near edge structure spectroscopy (XANES) or flank method.
期刊介绍:
Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.