{"title":"High resolution SIMS U-Th-Pb geochronology of small size (< 5 μm) monazite Constraints on the timing of Qiuling sediment-hosted gold deposit, South Qinling Orogen, central China","authors":"","doi":"10.2138/am-2023-9210","DOIUrl":"https://doi.org/10.2138/am-2023-9210","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140087400","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":"A modified genetic model for multiple pulsed mineralized processes at the giant Qulong porphyry Cu-Mo mineralization system","authors":"","doi":"10.2138/am-2023-9145","DOIUrl":"https://doi.org/10.2138/am-2023-9145","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140088737","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":"Compressibility, thermal expansion and Raman scattering of synthetic whitlockite Ca9Mg(PO3OH)(PO4)6 at high pressures and high temperatures","authors":"","doi":"10.2138/am-2023-9084","DOIUrl":"https://doi.org/10.2138/am-2023-9084","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140088740","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":"Lorenz number and transport properties of Fe: Implications to the thermal conductivity at Earth’s core-mantle boundary","authors":"","doi":"10.2138/am-2023-9246","DOIUrl":"https://doi.org/10.2138/am-2023-9246","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140088513","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}
Chunguang Wang, Yan Liang, Wenliang Xu, Chenguang Sun, Kei Shimizu
23 Amphibole and pyroxenes are the main reservoirs of rare earth elements (REEs) in 24 lithospheric mantle that has been affected by hydrous metasomatism. In this study, we 25 developed semi-empirical models for REE partitioning between orthopyroxene and 26 amphibole and between clinopyroxene and amphibole. These models were formulated on 27 the basis of parameterized lattice strain models of mineral–melt REE partitioning for 28 orthopyroxene, clinopyroxene, and amphibole, and they were calibrated using major 29 element and REE data of amphibole and pyroxenes in natural mantle samples from 30 intraplate setting. The mineral–melt REE partitioning models suggest that amphibole is 31 not in equilibrium with coexisting pyroxenes in the mantle samples, and that the 32 amphibole crystallized at a lower temperature than that of the pyroxenes. We estimated 33 the apparent amphibole crystallization temperature using major element compositions of 34 the amphibole and established temperature-and composition-dependent models that can 35 be used to predict apparent pyroxene–amphibole REE partition coefficients for 36 amphibole-bearing peridotite and pyroxenite from intraplate lithospheric mantle. 37 Apparent pyroxene–amphibole REE partition coefficients predicted by the models can be 38 used to infer REE contents of amphibole from REE contents of coexisting pyroxenes. 39 This is especially useful when the grain size of amphibole is too small for trace element 40 analysis. 41
{"title":"Distribution of REE between amphibole and pyroxenes in the lithospheric mantle: An assessment from the lattice strain model","authors":"Chunguang Wang, Yan Liang, Wenliang Xu, Chenguang Sun, Kei Shimizu","doi":"10.2138/am-2022-8831","DOIUrl":"https://doi.org/10.2138/am-2022-8831","url":null,"abstract":"23 Amphibole and pyroxenes are the main reservoirs of rare earth elements (REEs) in 24 lithospheric mantle that has been affected by hydrous metasomatism. In this study, we 25 developed semi-empirical models for REE partitioning between orthopyroxene and 26 amphibole and between clinopyroxene and amphibole. These models were formulated on 27 the basis of parameterized lattice strain models of mineral–melt REE partitioning for 28 orthopyroxene, clinopyroxene, and amphibole, and they were calibrated using major 29 element and REE data of amphibole and pyroxenes in natural mantle samples from 30 intraplate setting. The mineral–melt REE partitioning models suggest that amphibole is 31 not in equilibrium with coexisting pyroxenes in the mantle samples, and that the 32 amphibole crystallized at a lower temperature than that of the pyroxenes. We estimated 33 the apparent amphibole crystallization temperature using major element compositions of 34 the amphibole and established temperature-and composition-dependent models that can 35 be used to predict apparent pyroxene–amphibole REE partition coefficients for 36 amphibole-bearing peridotite and pyroxenite from intraplate lithospheric mantle. 37 Apparent pyroxene–amphibole REE partition coefficients predicted by the models can be 38 used to infer REE contents of amphibole from REE contents of coexisting pyroxenes. 39 This is especially useful when the grain size of amphibole is too small for trace element 40 analysis. 41","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140082722","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":"Polysomatic intergrowths between amphiboles and non-classical pyriboles in magnetite: smallest-scale features recording a protracted geological history","authors":"","doi":"10.2138/am-2023-9188","DOIUrl":"https://doi.org/10.2138/am-2023-9188","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140083089","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}
Thilo Bissbort, Kai-Uwe Hess, Martin Wilding, J. Schawe, B. Purgstaller, Katja E. Goetschl, Sebastian Sturm, Knut Müller-Caspary, Elena V. Sturm, Wolfgang Schmahl, E. Griesshaber, D. Weidendorfer, Martin Dietzel, Donald Bruce Dingwell
25 Amorphous calcium carbonate (ACC) is the least stable polymorph of calcium 26 carbonates. It has been identified to play an important role in nature (e.g., 27 biomineralization and speleothem formation), where it acts as a precursor for the 28 transformation to more stable polymorphs such as calcite. Further, the use of ACC in 29 technical applications requires a robust understanding of the material's properties. We 30 present the first study that reveals the existence of a glass transition for synthetic and 31 anhydrous ACC. The glass transition occurs at 339 °C. Such measurements are 32 impossible with conventional differential scanning calorimetry (DSC) due to the high 33 tendency of ACC to crystallize. Fast scanning DSC with heating rates of 500 °C/s and 34 higher, however, can be used to separate the endothermic glass transition signature from 35 the exothermic crystallization event since crystallization is shifted to higher temperatures. 36 This allows the detection and quantification of the glass transition for ACC. These 37 observations indicate that ACC is a structural glass and is especially significant because 38 the synthesis of ACC, precipitation from a solution followed by lyophilization, contrasts 39 with the more conventional and well-known route of glass formation the rapid cooling of 40 a melt. Moreover, we prove that a structural glass can be produced from a simple single-41 component carbonate system. 42
{"title":"The glass transition temperature of anhydrous amorphous calcium carbonate","authors":"Thilo Bissbort, Kai-Uwe Hess, Martin Wilding, J. Schawe, B. Purgstaller, Katja E. Goetschl, Sebastian Sturm, Knut Müller-Caspary, Elena V. Sturm, Wolfgang Schmahl, E. Griesshaber, D. Weidendorfer, Martin Dietzel, Donald Bruce Dingwell","doi":"10.2138/am-2023-9191","DOIUrl":"https://doi.org/10.2138/am-2023-9191","url":null,"abstract":"25 Amorphous calcium carbonate (ACC) is the least stable polymorph of calcium 26 carbonates. It has been identified to play an important role in nature (e.g., 27 biomineralization and speleothem formation), where it acts as a precursor for the 28 transformation to more stable polymorphs such as calcite. Further, the use of ACC in 29 technical applications requires a robust understanding of the material's properties. We 30 present the first study that reveals the existence of a glass transition for synthetic and 31 anhydrous ACC. The glass transition occurs at 339 °C. Such measurements are 32 impossible with conventional differential scanning calorimetry (DSC) due to the high 33 tendency of ACC to crystallize. Fast scanning DSC with heating rates of 500 °C/s and 34 higher, however, can be used to separate the endothermic glass transition signature from 35 the exothermic crystallization event since crystallization is shifted to higher temperatures. 36 This allows the detection and quantification of the glass transition for ACC. These 37 observations indicate that ACC is a structural glass and is especially significant because 38 the synthesis of ACC, precipitation from a solution followed by lyophilization, contrasts 39 with the more conventional and well-known route of glass formation the rapid cooling of 40 a melt. Moreover, we prove that a structural glass can be produced from a simple single-41 component carbonate system. 42","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140083543","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":"Tetrahedral aluminum in tourmaline from a spinel-pargasite-metamorphosed mafic ultramafic rock","authors":"","doi":"10.2138/am-2023-9170","DOIUrl":"https://doi.org/10.2138/am-2023-9170","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140086102","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":"Hyper-enrichment of heavy rare earth element in highly evolved granites through multiple hydrothermal mobilization","authors":"","doi":"10.2138/am-2023-9117","DOIUrl":"https://doi.org/10.2138/am-2023-9117","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140087822","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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