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Estimated Age and Metamorphic Parameters of High-Pressure Blastolites in the Gonzhinskii Block, Argun Superterrane, Eastern Part of the Central Asian Orogenic Belt

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Abstract—

Petrographic and thermobarometric data obtained on a blastolite lens hosted in sheared rocks of the Gonzhinskii block indicate that the lens contains four mineral assemblages: relict, main, an assemblage corresponding to biotitization, and that of retrograde alterations. The relict assemblage was likely eclogitic. The main mineral assemblage corresponds to zoisite amphibolite developing after eclogite. The P−T metamorphic parameters of this assemblage are P = 13.0−15.0 kbar and T = 580−670°C. However, if the calculations are done using the iron richest outer rim of amphibole 1, the P−T parameters are P = 13.0−17.0 kbar and T = 660−780°C. The mineral assemblage corresponding to the overprinted biotitization is clearly distinct texturally. The lines of the monomineral equilibria of the biotite assemblage plotted using various combinations of the composition of the garnet, biotite, and plagioclase well converge within a compact field of P = 12.5−13.2 kbar and T = 810−830°C. The latest assemblage of retrograde minerals includes low-Al amphibole 2. Our original Sm−Nd isotope date were used to calculate an isochron for a whole-rock sample, garnet, and two amphiboles. The isochron age of the rock is 171 ± 3 Ma and is interpreted as the age of the main mineral assemblage, i.e., its crystallization at the metamorphic peak.

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ACKNOWLEDGMENTS

The authors thank the scientific editor and reviewers for comments and recommendations that allowed us to improve the manuscript.

Funding

The petrologic and isotopic−geochemical studies were supported by ongoing institutional funding for Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, and the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKhI), Russian Academy of Sciences, 119991, Moscow, Russia

    M. M. Fugzan & T. I. Kirnozova

  2. Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, 109017, Moscow, Russia

    V. M. Kozlovskii

  3. Institute of Geology and Management of Natural Resources (IGIP), Far East Division, Russian Academy of Sciences, 675000, Blagoveshchensk, Russia

    R. O. Ovchinnikov

  4. Institute of Precambrian Geology and Geochronology (IGGD), Russian Academy of Sciences, 199034, St. Petersburg, Russia

    I. K. Kozakov

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  1. M. M. Fugzan
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  2. T. I. Kirnozova
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  3. V. M. Kozlovskii
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  4. R. O. Ovchinnikov
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  5. I. K. Kozakov
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Correspondence to M. M. Fugzan or I. K. Kozakov.

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Translated by E. Kurdyukov

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Fugzan, M.M., Kirnozova, T.I., Kozlovskii, V.M. et al. Estimated Age and Metamorphic Parameters of High-Pressure Blastolites in the Gonzhinskii Block, Argun Superterrane, Eastern Part of the Central Asian Orogenic Belt. Geochem. Int. 62, 234–244 (2024). https://doi.org/10.1134/S0016702924020058

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