Baddeleyite (ZrO2) in Plume and Subduction Zones from AR to PZ Time on Fennoscandian (Baltic) Shield: New U-Pb (TIMS) and LA-ICP-MS Data

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Bayanova T., Aysal N., Drogobuzhskaya S., Sarıfakıoğlu E., Dokukina K., Goev A., ...Daha Fazla

Uluslar Arası katılımlı 10. Jeokimya Sempozyumu, Ankara, Türkiye, 17 - 20 Ekim 2024, cilt.1, ss.18, (Özet Bildiri)

  • Yayın Türü: Bildiri / Özet Bildiri
  • Cilt numarası: 1
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.18
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet

Özet

Baddeleyite (ZrO2) is one the most important datable mineral compared with zircon for sensitive U-Pb (TIMS) and LA-ICP-MS dating. From Archaean (AR) to Palaeozoic (PZ) time baddeleyite was separated from BIF, PGE and multimetal Co-Cu-Ni, Cr-Ti-Mg-V deposits et set from Fennoscandian Baltic shield. Baddeleyite may originate from plume and subduction related tectonic settings. In continental crust (AR and PR) time baddeleyite grains were founded inside in the zircon and in the other rock-forming minerals. In subduction zone, baddeleyite crystals - are mostly twinned and reflected presence of 231Pa as discordances in U-Pb concordia diagram due to exceeded 207Pb (Bayanova et al., 2022). The Kovdor Ti-Mg and baddeleyite ores is a most important PZ massif so it’s the second within the world deposit of baddeleyite after the Phalaborwa (S. Africa). With the new U-Pb (TIMS) with artificial 205Pb/235U spike and LA-ICP-MS measurements made in different laboratories (Russia-Turkey-Australia), an age of 380±0.5 Ma was obtained from the Kovdor baddeleyite, and this value proves that it can be used as a new international natural reference material for laboratories using TIMS and LA-ICP-MS instruments. The Paleozoic Kola LIP (large igneous provinces) includes more than 20 massifs, the largest of which are deposits of apatite-nepheline ores - Khibiny, Lovozero, Ti-Mgt and baddeleyite ores – Kovdor. The new U-Pb and LA-ICP-MS data for twinned baddeleyite crystals from Kovdor carbonatites reflect the intervals of LIP (Ernst, 2014) with trap formation (Korchak et al., 2011) from 340 - 380 Ma. In the summary it can be noted that for U-Pb and LA-ICP-MS dating on baddeleyite is a more reliable geochronometer than zircon and is found in rocks of plume and subduction genesis. All research is carried out within the framework of the programs by Scientific Research Contracts FMEZ-2024-0004 Keywords: Baddeleyite, Fennoscandian shield, U-Pb (TIMS), LA-ICP-MS, 231Pa.