Meta-Ultramafic Rocks of the Maksyutov Complex, Southern Urals: High-Pressure Si-Al Metasomatism and Carbonatization at the Crust-Mantle Interface in the Subduction Zone

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Abstract

The eclogite-blueschists Maksyutov Complex is characterized by a complex fold-and-thrust structure that was developed during the Late Devonian collision between Baltica (East European Plate) and the Magnitogorsk Arc, that was formed during the Early Devonian intraoceanic subduction. Eclogites are the most studied rocks of the complex; their formation and exhumation are usually associated with the collisional stage of orogen development. At the same time, the origin of meta-ultramafic rocks, which together with eclogites form sheeted and lenses within metasedimentary rocks (shales and quartzites), still remains unknown. This paper presents the results of the first detailed petrological study of meta-ultramafic rocks, represented by antigorite-chlorite and magnesite-antigorite metaharzburgites, chlorite-antigorite metaorthopyroxenite. Mineral compositions and textural relationships between minerals in metaharzburgites indicate at least two stages of rock transformations. Minerals of the early mineral paragenesis (first stage) – olivine, accessory chromite and low-fluorine Ti-clinohumite – have a metamorphic genesis; ultrahigh-pressure (UHP) conditions of their formation are discussed. At the second stage, there was a partial replacement of olivine by orthopyroxene-bearing parageneses with Cr-Al antigorite and/or high-chromium chlorite. Based on the phase equilibria modeling using the Perple_X software package, it was found that the formation of antigorite-orthopyroxene paragenesis was associated with Si-Al metasomatism at: T ~ 630°С, P ~ 2 GPa, logaSiO₂ ~ –0.6, logaAl₂O₃ ~ – 2.5. It is important to note that the mineral paragenesis are highly sensitive to aSiO₂: a slight decrease in lgaSiO2 relative to the above value would lead to the growth of olivine with antigorite, and an increase would lead to the growth of orthopyroxene. The latter may explain the formation of meta-orthopyroxenites, which are widely distributed among the meta-ultramafic rocks of the Maksyutov Complex. Similar calculations performed for the range of XCO₂ = 0.01–0.05 in H₂O-CO₂ fluid showed replacing silicate minerals by magnesite under the established thermodynamic conditions. Carbonation and Si-Al metasomatism are specific features of high-pressure transformations of meta-ultramafic rocks, which have not been established in the associated eclogites, quartzites, and shales. Such selectivity of fluid influence on different rock types is interpreted as a result their different tectono-metamorphic evolution: meta-ultramafic rocks are fragments of the suprasubduction mantle, which were tectonically combined with the rocks of the subducting plate (eclogites and metasedimentary rocks).

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About the authors

A. L. Perchuk

Lomonosov Moscow State University, Department of Geology; Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: alp@geol.msu.ru

геологический факультет, кафедра петрологии и вулканологии

Russian Federation, Moscow; Chernogolovka, Moscow region

N. G. Zinovieva

Lomonosov Moscow State University, Department of Geology

Email: alp@geol.msu.ru

геологический факультет, кафедра петрологии и вулканологии

Russian Federation, Moscow

A. V. Sapegina

Lomonosov Moscow State University, Department of Geology; Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: alp@geol.msu.ru

геологический факультет, кафедра петрологии и вулканологии

Russian Federation, Moscow; Chernogolovka, Moscow region

P. M. Valizer

Institute of Geology and Geochemistry, Russian Academy of Sciences, Academician D.S. Zavaritsky Ural Branch of the Russian Academy of Sciences

Email: alp@geol.msu.ru
Russian Federation, Yekaterinburg

V. M. Kozlovsky

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: alp@geol.msu.ru
Russian Federation, Moscow

V. M. Grigorieva

Lomonosov Moscow State University, Department of Geology

Email: alp@geol.msu.ru

геологический факультет, кафедра петрологии и вулканологии

Russian Federation, Moscow

S. T. Podgornova

Lomonosov Moscow State University, Department of Geology

Email: alp@geol.msu.ru

геологический факультет, кафедра петрологии и вулканологии

Russian Federation, Moscow

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