EVALUATION OF THERMAL METAMORPHISM TEMPERATURE OF EQUILIBRATED ORDINARY CHONDRITES
https://doi.org/10.5800/GT-2022-13-2s-0618
Abstract
The article provides an evaluation of thermal metamorphism temperatures on chondrite parent bodies using an olivine-Сr spinel geothermometer. To calculate temperatures, the results of EPMA analysis of the major and trace elements in olivine and Cr spinel of Kargapole, Orlovka, Saratov, Elenovka, Buschhof, Bjurböle and Knyahinya meteorites are used. The obtained temperatures are consistent with the onion-shell model of the planetesimal structure, in which the most metamorphosed chondrites are closer to the heating source (Buschhof, L6-734 °C), meteorites of the 5th petrologic type (p.t.) occupied an intermediate position (Orlovka, H5 – 687 °С; Elenovka, L5 – 691 °С; Knyaginya, LL5 – 700 °C), and the chondrites of the 4th p.t. were closer to the surface (Kargapole, H4 – 691 °C; Saratov, L4 – 670 °С; Bjurböle, LL4 – 682 °C). The Kargapole and Saratov meteorites are characterized by evaluation of Mg and Fe equilibrium temperatures that disagree with the onion-shell model, which can be explained by the individual history of the meteorite (for example, impact metamorphism, slow and prolonged heating).
Keywords
Supporting agencies: The study was carried out as part of the research topic of IPGG RAS № FMUW-2022-0005. The work used the equipment of the Shared Research Facilities "AIRIZ" of IPGG RAS.
About the Authors
К. G. Sukhanova
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Russian Federation
Russian Federation
2 Makarova Emb, Saint Petersburg, 199034
A. B. Kuznetsov
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Russian Federation
Russian Federation
2 Makarova Emb, Saint Petersburg, 199034
S. G. Skublov
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences;
Saint Petersburg Mining University
Russian Federation
Russian Federation
2 Makarova Emb, Saint Petersburg, 199034;
2 21st Line, Saint Petersburg, 199106
O. L. Galankina
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Russian Federation
Russian Federation
2 Makarova Emb, Saint Petersburg, 199034
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Review
For citations:
Sukhanova К.G., Kuznetsov A.B., Skublov S.G., Galankina O.L. EVALUATION OF THERMAL METAMORPHISM TEMPERATURE OF EQUILIBRATED ORDINARY CHONDRITES. Geodynamics & Tectonophysics. 2022;13(2):0618. (In Russ.) https://doi.org/10.5800/GT-2022-13-2s-0618
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