A. N. Konilov

Research Field

Cordierite

10.17491/jgsi/1998/510111

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Citations (3)

Biotite dehydration, partial melting, and fluid composition; experiments in the system KAlO₂-FeO-MgO-SiO₂-H₂O-CO₂

American Mineralogist (1999)

A. A. Graphchikov A. N. Konilov J. D. Clemens

Biotite solid-solutions are a significant H2O reservoir in the lithosphere, and the assemblage Bt + Opx + Kfs + Qtz is commonly used to estimate aH₂O in high-grade metamorphic and magmatic rocks. Here we report experimental constraints on subsolidus mineral equilibria involving biotite and orthopyroxene in the system KAlO2-MgO-FeO-SiO2-H2O-CO2. Our experiments address the question of stability of biotite of a given XFe in the assemblage Bt + Qtz ± Sa, or the stability of the assemblage Opx + Sa ± Qtz. Clemens (1993) and Clemens et al. (1997) concluded that CO2 has no effect other than to lower aH₂O and thereby raise the solidus T. Our data at XFlH₂O < 1 extend these conclusions to encompass Fe-bearing systems more similar to natural rocks. From a comparison of experimental data and calculated isopleths of biotite composition in the divariant assemblage Bt + Opx + Kfs + Qtz + fluid, it appears that phlogopite-annite solid-solutions must be significantly non-ideal (at T , 800 °C) or that enstatite-ferrosilite solid-solutions must have negative values for their Margules-type parameters. Ignoring these factors would result in any calculated aH₂O values being too low. Although various models allow us to estimate XH₂O in H2O-CO2 fluids, we are still unable to use biotite equilibria to estimate aH₂O accurately during high-grade metamorphism and magma crystallization. We also consider qualitatively the effects Fe-Mg biotite solid-solution on partial melting equilibria in fluid-poor (rock-dominated) systems in which hydration-dehydration reactions control the fluid composition.

10.2138/am-1999-1-202

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Citations (16)

Olivine-bearing rocks of the Lapland granulite belt (Baltic Shield)

Geochemistry International (2016)

E. N. Terekhov Т. Ф. Щербакова A. N. Konilov

Protolith

Amphibole

10.1134/s001670291609010x

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Citations (2)

The Archean Salma eclogites, Kola Peninsula, Russia: Petrology, geochronology and significance for insight into the Archean crust-forming processes

European geosciences union general assembly (2006)

A. Schipansky A. N. Konilov Michael V. Mints Елена Белоусова L. M. Natapov

Geochronology

Kola peninsula

Peninsula

Source

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Citations (1)

North Karelian greenstone belt, NE Baltic Shield, Russia: Evidence for the 2.8 Ga onset of warm subduction regime

EGS - AGU - EUG Joint Assembly (2003)

A. A. Shchipansky A. N. Konilov K. A. Krylov А. В. Самсонов

Baltic Shield

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Citations (0)

The Meso-Neoarchaean Belomorian eclogite province: Tectonic position and geodynamic evolution

Gondwana Research (2012)

Michael V. Mints K. A. Dokukina A. N. Konilov

10.1016/j.gr.2012.11.010

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Citations (69)

8. Late Paleoproterozoic Lapland–Mid-Russia–South Baltia intracontinental collisional orogen

Geological Society of America Special Papers (2015)

Michael V. Mints Pavel S. Babayants Yury I. Blokh M. M. Bogina William A. Bush

The Late Paleoproterozoic Lapland–Mid-Russia–South Baltia orogen surrounds the Karelian craton as a wide arc, separating it from Volgo-Uralia and Sarmatia. The orogen extends for more than 3000 km; its width in the northern and central segments is 400–700 km and increases to 1000 km in the southwest.

10.1130/2015.2510(08)

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Citations (1)

Age of the high-temperature gneiss core of the central Caucasus

Doklady Earth Sciences (2007)

M. L. Somin E. N. Lepekhina A. N. Konilov

10.1134/s1028334x07050066

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Citations (12)

East European Craton: Early Precambrian History and 3D Models of Deep Crustal Structure

Geological Society of America eBooks (2015)

Michael V. Mints K. A. Dokukina A. N. Konilov Irina B. Philippova Valery L. Zlobin