A. I. Smul’skaya

The study of two varieties of pseudotachylytes (PST) in granitoids of the Riphean complex on the Barents Sea coast of the Kola Peninsula (Rybachii and Srednii peninsulas) and in metapsammite of the Paleoproterozoic complex in the Northern Ladoga region by a few independent analytical methods has made it possible to establish that they belong to different genetic forms, such as mechanically crushed rocks and melting products, respectively. As for the melting differences, we have given a detailed description of the mineral and material transformations of the original rock into the PST glass matrix and obtained evidence for the initial melting out of the micaceous eutectics with its subsequent shift to the granite type. The conclusion has been made on the most likely formation of molten PST due to frictional rock melting under rapid rise of its blocks from a depth of 12–15 km to the crustal surface (less than 3 km) along the faults of presumably seismogenic nature. It is suggested that crushing and frictional melting can be complementary, rather than mutually exclusive processes, and the formation of molten PST is commonly preceded by the mechanical rock crushing stage.

Kola peninsula

Matrix (chemical analysis)

Riphean

10.31857/s0869-56524845589-594

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Citations (1)

Features of Frictional Melting of Rocks and Melt Crystallization in a Seismic Process: Case Study of Pseudotachylites of the Ladoga Region

Izvestiya Physics of the Solid Earth (2022)

M. A. Matveev A. I. Smul’skaya Yu. A. Morozov

Solidus

10.1134/s106935132206009x

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Citations (3)

Effects of high pressure and temperature on the properties of nanocrystals in rocks: Evidences from Raman spectroscopy

Izvestiya Physics of the Solid Earth (2011)

G. A. Sobolev Yu. S. Genshaft S. M. Kireenkova Yu. A. Morozov A. I. Smul’skaya

10.1134/s1069351311050053

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Citations (6)

Main features of the structure and age of the crystalline basement of the Fore Range of the Northern Caucasus

Acta Geologica Sinica - English Edition (2019)

Vladimir Kamzolkin А. В. Латышев Y. Vidjapin S. D. Ivanov A. I. Smul’skaya

10.1111/1755-6724.14074

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Citations (0)

Nanostructures in the deep xenolite before and after straining

Izvestiya Physics of the Solid Earth (2009)

G. A. Sobolev S. M. Kireenkova Yu. A. Morozov A. I. Smul’skaya V. A. Tselmovich

Pyrope

Omphacite

10.1134/s1069351309090018

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Citations (5)

Geochemical Aspects of the Frictional Melting of Metapsammites during Seismic Slips (with Reference to Pseudotachylytes of the Ladoga Region)

Doklady Earth Sciences (2023)

Yu. A. Morozov M. A. Matveev С. Г. Скублов A. I. Smul’skaya E. N. Terekhov

Abstract Based on analytical data on the geochemistry of tectonic pseudotachylytes and their host rocks, the specific trends of redistribution of major, trace, and rare earth elements in the course of seismogenic frictional melting of the arkosic metaterrigenous rocks from three zones of regional metamorphism with different temperatures (greenschist, amphibolite, and granulite) in the Northern Ladoga region are discussed. Oppositely directed trends of changes in the contents of the oxides of major elements in the protolith–blastocataclasite–pseudotachylyte triad were revealed, and a unidirectional increase in the basicity of the frictional melt as compared with the protolith was established at the same time. Geochemical evidence for partial selective melting of the protoliths is discussed. The specific features of the fractionation of trace and rare-earth elements during the transition of the protolith into the melt, as well as during its subsequent partial recrystallization, are shown. The emergence of a peak of elevated europium contents relative to the protolith in the melt matrix of all three sampling points is noted. Based on changes in the concentrations of these elements in the zones of pseudotachylyte substrate generation and in the areas of its moving and injection, the estimates of their differential mobility during frictional melting in a dynamic slip zone are given.

Protolith

10.1134/s1028334x22601833

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Citations (0)

Late Vendian Complexes in the Structure of Metamorphic Basement of the Fore Range Zone, Greater Caucasus

Geotectonics (2018)

Vladimir Kamzolkin А. В. Латышев Yu. P. Vidyapin M. L. Somin A. I. Smul’skaya

Massif

Basement

Outcrop

10.1134/s0016852118030020

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