Pub Date : 2023-07-27DOI: 10.2138/am-2023-NMN10885
A. Celestian
Abstract This issue of New Mineral Names provides a summary of the newly described minerals donowensite, mikehowardite, bortolanite, fluorsigaiite, alumolukrahnite, ferro-ferri-katophorite, tomsquarryite, and argentotetrahedrite-(Zn).
{"title":"New Mineral Names","authors":"A. Celestian","doi":"10.2138/am-2023-NMN10885","DOIUrl":"https://doi.org/10.2138/am-2023-NMN10885","url":null,"abstract":"Abstract This issue of New Mineral Names provides a summary of the newly described minerals donowensite, mikehowardite, bortolanite, fluorsigaiite, alumolukrahnite, ferro-ferri-katophorite, tomsquarryite, and argentotetrahedrite-(Zn).","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"108 1","pages":"1571 - 1572"},"PeriodicalIF":3.1,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48291465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Le Zhang, L. Hong, Shengping Qian, Pengli He, Miaohong He, Ya-Nan Yang, Jin-Tuan Wang, Yanqiang Zhang, Zhong‐Yuan Ren
Abstract Olivine compositions are widely used to constrain magmatic thermodynamic conditions such as magmatic temperature, oxygen fugacity, and H2O content. However, elemental diffusion may change the initial compositions and lead to large uncertainty on the estimation of these thermodynamic conditions. In this study, we conducted LA-ICP-MS elemental mapping and EPMA analysis of olivine phenocrysts and olivine-hosted spinel from the Jiagedaqi (JGD) alkaline basalts in northeast China to evaluate the influence of elemental difusion on olivine-composition-based geothermometry, oxybarometry, and hygrometry. The JGD olivines show normal Fo [Mg/(Mg + Fe) × 100 in moles] zoning, with cores having Fo of 77–87 and rims having Fo of 67–73. The constant P contents from core to rim indicate that these compositional zonings were caused mainly by difusion. Because Al is a slow-diffusing element and its content is relatively constant from core to rim, the temperature calculated by the Al-in-olivine thermometer is not influenced by elemental difusion and preserves the JGD olivine crystallization temperature up to 1150 °C. The temperatures calculated using the Sc/Y-in-olivine thermometer, the oxygen fugacity calculated using the olivine–spinel oxybarometer, and the H2O content calculated on the basis of Ca partitioning between olivine and melt are strongly influenced by the diffusion of Fo, Sc/Y, and Ca. However, the compositional plateaus in olivine cores, which were not influenced by elemental diffusion, preserve the magmatic temperature (1150 °C), oxygen fugacity (QFM+1.4), and H2O content (4 wt%) that applied during the formation of the JGD olivines. Together, these findings suggest that the mantle source of the JGD basalts was metasomatized by fluids released from the subducted slab. This study highlights that elemental difusion in olivine phenocrysts can strongly afect the application of olivine-composition-based geothermometers, oxybarometers, and hygrometers. However, primitive olivine cores that have not been influenced by difusion preserve the initial magmatic thermodynamic conditions.
{"title":"The effect of elemental diffusion on the application of olivine-composition-based magmatic thermometry, oxybarometry, and hygrometry: A case study of olivine phenocrysts from the Jiagedaqi basalts, northeast China","authors":"Le Zhang, L. Hong, Shengping Qian, Pengli He, Miaohong He, Ya-Nan Yang, Jin-Tuan Wang, Yanqiang Zhang, Zhong‐Yuan Ren","doi":"10.2138/am-2022-8567","DOIUrl":"https://doi.org/10.2138/am-2022-8567","url":null,"abstract":"Abstract Olivine compositions are widely used to constrain magmatic thermodynamic conditions such as magmatic temperature, oxygen fugacity, and H2O content. However, elemental diffusion may change the initial compositions and lead to large uncertainty on the estimation of these thermodynamic conditions. In this study, we conducted LA-ICP-MS elemental mapping and EPMA analysis of olivine phenocrysts and olivine-hosted spinel from the Jiagedaqi (JGD) alkaline basalts in northeast China to evaluate the influence of elemental difusion on olivine-composition-based geothermometry, oxybarometry, and hygrometry. The JGD olivines show normal Fo [Mg/(Mg + Fe) × 100 in moles] zoning, with cores having Fo of 77–87 and rims having Fo of 67–73. The constant P contents from core to rim indicate that these compositional zonings were caused mainly by difusion. Because Al is a slow-diffusing element and its content is relatively constant from core to rim, the temperature calculated by the Al-in-olivine thermometer is not influenced by elemental difusion and preserves the JGD olivine crystallization temperature up to 1150 °C. The temperatures calculated using the Sc/Y-in-olivine thermometer, the oxygen fugacity calculated using the olivine–spinel oxybarometer, and the H2O content calculated on the basis of Ca partitioning between olivine and melt are strongly influenced by the diffusion of Fo, Sc/Y, and Ca. However, the compositional plateaus in olivine cores, which were not influenced by elemental diffusion, preserve the magmatic temperature (1150 °C), oxygen fugacity (QFM+1.4), and H2O content (4 wt%) that applied during the formation of the JGD olivines. Together, these findings suggest that the mantle source of the JGD basalts was metasomatized by fluids released from the subducted slab. This study highlights that elemental difusion in olivine phenocrysts can strongly afect the application of olivine-composition-based geothermometers, oxybarometers, and hygrometers. However, primitive olivine cores that have not been influenced by difusion preserve the initial magmatic thermodynamic conditions.","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"108 1","pages":"1449 - 1460"},"PeriodicalIF":3.1,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43151620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Equilibrium Sn isotope fractionation between aqueous Sn and Sn-bearing minerals: Constrained by first-principles calculations","authors":"","doi":"10.2138/am-2022-8804","DOIUrl":"https://doi.org/10.2138/am-2022-8804","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45837121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yunhao Ji, Guiqing Xie, R. Romer, Wei Li, Qiaoqiao Zhu, Bin Fu
{"title":"Scheelite composition fingerprints pulsed flow of magmatic fluid in the Fujiashan W skarn deposit, eastern China","authors":"Yunhao Ji, Guiqing Xie, R. Romer, Wei Li, Qiaoqiao Zhu, Bin Fu","doi":"10.2138/am-2022-8917","DOIUrl":"https://doi.org/10.2138/am-2022-8917","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41699099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thermal and combined high-temperature and high-pressure behavior of a natural intermediate scapolite","authors":"","doi":"10.2138/am-2023-8962","DOIUrl":"https://doi.org/10.2138/am-2023-8962","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135210126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Wua, David R. Cookec, Michael J. Bakerc, Lejun Zhangc, Pei Liangf, Paul Olind, L. Danyushevsky, Huayong Chena
{"title":"Using pyrite composition to track the multi-stage fluids superimposed on a porphyry Cu system","authors":"C. Wua, David R. Cookec, Michael J. Bakerc, Lejun Zhangc, Pei Liangf, Paul Olind, L. Danyushevsky, Huayong Chena","doi":"10.2138/am-2022-8727","DOIUrl":"https://doi.org/10.2138/am-2022-8727","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46068160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuan-Hui Xie, J. Schwartz, Xiao-Wei Li, Keda Cai, Bader Thomas, Huan, Li, Fang-Yue Wang, Xiao-bing Zhang, X. Mo, Guo-Chen Dong
{"title":"Revisiting the genesis of the adakite-like granitoids in collisional zones: water-fluxed melting of intermediate to felsic rocks with dilution by low Sr/Y phases","authors":"Yuan-Hui Xie, J. Schwartz, Xiao-Wei Li, Keda Cai, Bader Thomas, Huan, Li, Fang-Yue Wang, Xiao-bing Zhang, X. Mo, Guo-Chen Dong","doi":"10.2138/am-2022-8873","DOIUrl":"https://doi.org/10.2138/am-2022-8873","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42277493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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