American Mineralogist最新文献

{"title":"Scandio-winchite, ideally □(NaCa)(Mg4Sc)(Si8O22)(OH)2, the first Sc-dominant amphibole supergroup mineral from Jordanów Śląski, Lower Silesia, southwestern Poland: description and crystal structure","authors":"","doi":"10.2138/am-2023-8974","DOIUrl":"https://doi.org/10.2138/am-2023-8974","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46920270","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":"Tourmaline Growth in the Border and Wall Zones of the Emmons Pegmatite (Maine, Usa): Evidence for Disequilibrium Crystallization and Boundary Layer Formation","authors":"","doi":"10.2138/am-2023-8991","DOIUrl":"https://doi.org/10.2138/am-2023-8991","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45653634","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":"Multi-scale and multi-modal imaging study of mantle xenoliths and petrological implications","authors":"M. Venier, L. Ziberna, G. Roncoroni, A. Demin","doi":"10.2138/am-2022-8866","DOIUrl":"https://doi.org/10.2138/am-2022-8866","url":null,"abstract":"22 The accurate textural characterization of mantle xenoliths is one of the fundamental steps to 23 understanding the main processes occurring in the upper mantle, such as sub-solidus 24 recrystallization, magmatic crystallization and metasomatism. Texture, composition, and 25 mineralogy reflect the temperature, pressure, stress conditions, melting and/or contamination events 26 undergone before and during the entrapment in the host magma. For these reasons, characterizing 27 the three-dimensional (3D) texture of silicate, oxide, sulfide and glass phases has great importance 28 in the study of mantle xenoliths. We performed a multi-scale and multi-modal 3D textural analysis 29 based on X-ray computed microtomography (μ-CT) data of three mantle xenoliths from different 30 geodynamic settings (i.e. mobile belt zone, pericraton, oceanic hotspot). The samples were selected 31 to represent different, variably complex, internal structures, composed of grains of different phases, 32 fractures, voids and fluid inclusions of different sizes. We used an approach structured in increasing 33 steps of spatial and contrast resolution, starting with in-house X-ray μ-CT imaging (working at 34 spatial resolution from 30 μm down to 6.25 μm) and moving to high-resolution synchrotron X-ray 35 μ-CT at the micron scale. 36 We performed a 3D characterization of mantle xenoliths comparing the results with the analysis of 37 conventional 2D images (thin sections) obtained by optical microscopy and simulating the random 38","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46041460","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":"Single-Crystal X-ray Diffraction on the Structure of (Al,Fe)-bearing Bridgmanite in the Lower Mantle","authors":"S. Fu, S. Chariton, Yanyao Zhang, T. Okuchi, V. Prakapenka, Jung‐Fu Lin","doi":"10.2138/am-2023-8969","DOIUrl":"https://doi.org/10.2138/am-2023-8969","url":null,"abstract":"12 Here we have performed single-crystal X-ray diffraction (SCXRD) experiments on two high-13 quality crystal platelets of (Al,Fe)-bearing bridgmanite 14 (Mg 0.88 Fe 3+0.065 Fe 2+0.035 Al 0.03 )(Al 0.11 Si 0.90 )O 3 (Fe10-Al14-Bgm) up to 64.6(6) GPa at room 15 temperature in a Boehler-Almax type diamond anvil cell. Refinements on the collected SCXRD 16 patterns reveal reliable structural information of single-crystal Fe10-Al14-Bgm, including unit-17 cell parameters, atomic coordinates, and anisotropic displacement parameters. Together with 18 Mössbauer and electron microprobe analyses, our best single-crystal refinement model indicates 19 that our sample contains ~6.5 mol% Fe 3+ , 3.5 mol% Fe 2+ , and 3 mol% Al 3+ in the large pseudo-20 dodecahedral site (A site), and ~11 mol% Al 3+ in the small octahedral site (B site). This may 21 indicate that Al 3+ in bridgmanite preferentially occupies the B site. Our results show","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44229033","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":"Geochemical discrimination of pyrite in diverse ore deposit types through statistical analysis and machine learning techniques","authors":"","doi":"10.2138/am-2023-8976","DOIUrl":"https://doi.org/10.2138/am-2023-8976","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44070598","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":"Memorial of Maryellen Cameron (1943−2022)","authors":"Kevin D. Crowle, W. Bagby, John M. Hughes","doi":"10.2138/am-2023-M1017","DOIUrl":"https://doi.org/10.2138/am-2023-M1017","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"108 1","pages":"1569 - 1570"},"PeriodicalIF":3.1,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41806010","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":"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}

{"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":"Interfacial Interactions Controlling Adsorption of Metal Cations onto Montmorillonites","authors":"","doi":"10.2138/am-2022-8834","DOIUrl":"https://doi.org/10.2138/am-2022-8834","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":"43371117","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}