E. S. Sorokina, E. V. Medvedeva, A. B. Nemov, M. A. Rassomakhin, L. N. Kogarko
{"title":"Differentiation Features of Alkaline Rocks in Ilmen Miaskite Massif: New Mineralogical and Geochemical Data","authors":"E. S. Sorokina, E. V. Medvedeva, A. B. Nemov, M. A. Rassomakhin, L. N. Kogarko","doi":"10.1134/S0016702924700782","DOIUrl":null,"url":null,"abstract":"<p>The Ilmen miaskite massif in the Southern Urals remains largely understudied from the mineralogical and geochemical standpoints, and theories of its formation are still debatable. The paper presents the first data on the mineral associations of the miaskite varieties and REE-rich minerals. Microchemical studies determined that the pyroxene–amphibole miaskites are the most promising rock variety for REE mineralization (REE content at ca. 1500 ppm). These rocks show clearly discernible positive Nb anomalies combined with a negative Pb anomaly. The temperatures of feldspar exsolution indicate their following formation sequence within the miaskite varieties (from higher temperature to lower temperature ones): pyroxene–amphibole miaskite → garnet–amphibole miaskite → amphibole miaskite → biotite miaskite</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"63 1","pages":"51 - 62"},"PeriodicalIF":0.7000,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geochemistry International","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S0016702924700782","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Differentiation Features of Alkaline Rocks in Ilmen Miaskite Massif: New Mineralogical and Geochemical Data
The Ilmen miaskite massif in the Southern Urals remains largely understudied from the mineralogical and geochemical standpoints, and theories of its formation are still debatable. The paper presents the first data on the mineral associations of the miaskite varieties and REE-rich minerals. Microchemical studies determined that the pyroxene–amphibole miaskites are the most promising rock variety for REE mineralization (REE content at ca. 1500 ppm). These rocks show clearly discernible positive Nb anomalies combined with a negative Pb anomaly. The temperatures of feldspar exsolution indicate their following formation sequence within the miaskite varieties (from higher temperature to lower temperature ones): pyroxene–amphibole miaskite → garnet–amphibole miaskite → amphibole miaskite → biotite miaskite
期刊介绍：
Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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