Relatively high geothermal gradient and greater depths of the erosion plane may account for certain distinctions of the Lower Archean metamorphic complexes. Their granulites and amphibolites could not have been formed at depths shallower than 15-16 and 10 km, respectively, as indicated by review of the available data. The granulite fades of metamorphism is not restricted to Precambrian rocks, but is found also in younger complexes, some of which outcrop on the surface of the ground, although they were subjected to intensive autodiaphthoresis, which usually accompanied crystallization of anatectic melts within the amphibolitic range of the temperature.

Outcrop

10.1080/00206817109475594

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Distribution of regional metamorphism fades in U.S.S.R.

International Geology Review (1966)

N.I. Dobretsov В. В. Ревердатто V. S. Sobolev N.V. Sobnlev Ye. N. Ushakova

A detailed classification of regional metamorphic rock facies is presented along with the results of compiling a small scale Map of Metamorphic Facies of U.S.S.R. It is demonstrated that typical metamorphic complexes are associated with certain large structural elements of the crust. The aspects of metamorphism are used in identifying the areas of ancient platforms, two types of mobile belts, and two types of high pressure zones at the junction of major structures of different degrees of stability.—Author

10.1080/00206816609474411

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Citations (3)

Diamond potential estimation based on kimberlite major element chemistry

Journal of Geochemical Exploration (2002)

V. B. Vasilenko Н. Н. Зинчук В О Красавчиков L. G. Kuznetsova В. В. Хлестов

Diatreme

Xenolith

10.1016/s0375-6742(02)00219-4

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Citations (46)

Restitic ultramafic rocks in the Early Caledonian collisional system of western Cisbaikalia

Russian Geology and Geophysics (2013)

А. С. Мехоношин А. Г. Владимиров V. G. Vladimirov Н. И. Волкова Т. Б. Колотилина

Ultramafic rock

10.1016/j.rgg.2013.09.007

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Citations (16)

Multiparametric discrimination of garnets from high-pressure ultramafic rocks: Evidence from the rare-earth element composition

Doklady Earth Sciences (2013)

В. В. Хлестов Felix P. Lesnov A. Yu. Selyatitskii

Ultramafic rock

Rare-earth element

10.1134/s1028334x13050036

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Gabbro-granite intrusive series and their indicator importance for geodynamic reconstructions

Petrology (2013)

А. Г. Владимиров A.E. Izokh Gleb V. Polyakov G.A. Babin А. С. Мехоношин

Quartz monzonite

Mantle plume

Ultramafic rock

10.1134/s0869591113020070

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Citations (28)

Principles of identification and classification of regional metamorphic formations

International Geology Review (1970)

I.L. Dobretsov V. S. Sobolev В. В. Хлестов

Identification

10.1080/00206817009475339

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An analysis of uncertainty in non‐equilibrium and equilibrium geothermobarometry

Journal of Metamorphic Geology (2004)

J. R. Ashworth V. S. Sheplev В. В. Хлестов Vyatcheslav A. Ananyev

Abstract In statistically optimised P – T estimation, the contributions to overall uncertainty from different sources are represented by ellipses. One source, for a diffusion‐controlled reaction at non‐equilibrium, is diffusion modelling of the reaction texture. This modelling is used to estimate ratios, Q , between free‐energy differences, Δ G , of reactions among mineral end‐members, to replace the equilibrium condition Δ G = 0. The associated uncertainty is compared with those already inherent in the equilibrium case (from end‐member data, activity models and mineral compositions). A compact matrix formulation is introduced for activity coefficients, and their partial derivatives governing error propagation. The non‐equilibrium example studied is a corona reaction with the assemblage Grt–Opx–Cpx–Pl–Qtz. Two garnet compositions are used, from opposite sides of the corona. In one of them, affected by post‐reaction Fe, Mg exchange with pyroxene, the problem of reconstructing the original composition is overcome by direct use of ratios between chemical‐potential differences, given by the diffusion modelling. The number of geothermobarometers in the optimisation is limited by near‐degeneracies. Their weightings are affected by strong correlations among Q ratios. Uncertainty from diffusion modelling is not large in comparison with other sources. Overall precision is limited mainly by uncertainties in activity models. Hypothetical equilibrium P – T are also estimated for both garnet compositions. By this approach, departure from equilibrium can be measured, with statistical uncertainties. For the example, the result for difference from equilibrium pressure is 1.2 ± 0.7 kbar.

Geothermobarometry

Pyroxene

Solubility equilibrium

Chemical equilibrium

10.1111/j.1525-1314.2004.00552.x

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Citations (3)