what is tschermak substitution

A., Lopez Sanchez-Vizcaino, V., Hermann, J., Connolly, J. keywords = "Antigorite, Tschermak's exchange, Geothermobarometry, Serpentinite, Dehydration, Subduction zones, HIGH-PRESSURE SERPENTINITES, SYSTEM MGO-SIO2-H2O MSH, CERRO DEL ALMIREZ, WESTERN ALPS, PROGRESSIVE METAMORPHISM, CHLORITE HARZBURGITE, TITANIAN CLINOHUMITE, ULTRAMAFIC COMPLEX, SUBDUCTION ZONES, EASTERN DESERT". (C) 2013 Elsevier B.V. All rights reserved. Tschermak substitution; Latitude & Longitude N43°45'00" - N44°15'00", W104°00'00" - W103°19'60" View Full GeoRef Record. Muscovites with a high celadonite content (phengites) occur in low-temperature rocks in any of the high-, medium- and low-pressure types of metamorphism, probably because the exchange equilibrium for Tschermak substitution between muscovite and chlorite is not sensitive to pressure. author = "Padron-Navarta, {Jose Alberto} and {Lopez Sanchez-Vizcaino}, Vicente and Joerg Hermann and Connolly, {James A. D.} and Garrido, {Carlos J.} 2a). Don't already have an Oxford Academic account? TSCHERMAK SUBSTITUTION IN THE ASSEMBLAGE MUSCOVITE PLUS BIOTITE PLUS CHLORITE PLUS QUARTZ - A COMPARISON BETWEEN NATURAL AND THERMODYNAMIC DATA. Part 6. 1995 (English) In: NEUES JAHRBUCH FUR MINERALOGIE-MONATSHEFTE, ISSN 0028-3649, no 2, p. 75-95 Article in journal (Other scientific) Published Mafic Rocks Read Chapter 4 of An Introduction to Metamorphic Petrology by Bruce Yardley or Chapter 25 of Igneous and Metamorphic Petrology by John Winter or Chapter 16 of Igneous and Metamorphic Petrology by Philpotts. This temperature sensitivity is the basis for a serpentinite geothermometer at greenschist, amphibolite and eclogite fades conditions. AKIHO MIYASHIRO, FUMIKO SHIDO, Tschermak Substitution in Low- and Middle-grade Pelitic Schists, Journal of Petrology, Volume 26, Issue 2, May 1985, Pages 449–487, https://doi.org/10.1093/petrology/26.2.449. The maximum possible celadonite content in muscovite under given external conditions is realized in K-feldspar-bearing rocks, and decreases with rising temperature. Maintains charge by incorporating interstitial atoms within lattice. The distribution coefficient of the exchange reaction for Tschermak substitution between muscovite and chlorite varies greatly not only with temperature but also with the extent of this substitution in the two minerals because of their strong deviation from ideality. The buffered assemblage is stable in harzburgite compositions for relatively moderate amounts of Al2O3 (>1.8 wt.%) and is widespread in lherzolites, where it occurs together with diopside or, in a narrow temperature field, with tremolite. {\%} Al2O3 at 20 kbar-650 degrees C and of 4.5 wt. The Crystal Structure of CaFe3+SiAlO6 and the Crystal Chemistry of Fe3+?Al3+ Substitution in Calcium Tschermak's Pyroxene. From such a viewpoint, we examine reactions and progressive mineralogical changes in metapelites, beginning with K-feldspar-bearing low-grade metapelitic rocks, in which biotite appears by reaction of K-feldspar with chlorite at a temperature lower than that of the biotite isograd defined for K-feldspar-free pelitic rocks. If you originally registered with a username please use that to sign in. In these K-bentonites, Tschermak substitution appears to be a better indicator of palaeotemperature than K-substitution. The antigorite Al-contents predicted with this model are in agreement with natural observations and suggest a maximum alumina solubility in antigorite of 3.6 wt.% Al2O3 at 20 kbar-650 degrees C and of 4.5 wt.% Al2O3 at 3 kbar-560 degrees C. In the assemblage antigorite-olivine-chlorite-fluid, the Al-content of antigorite is buffered and temperature sensitive. white mica Al-Si chemistry (Tschermak substitution) were selected for study using short-wave infrared (SWIR) spectrometry, focusing on the wavelength of the absorption positioned between 2190 and 2220 nm. Maintains charge balance by leaving some sites vacant. Laboratoire de Géologie, UMR 8538, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France * E-mail: parra@geologie.ens.fr. trends. The antigorite Al-contents predicted with this model are in agreement with natural observations and suggest a maximum alumina solubility in antigorite of 3.6 wt.% Al2O3 at 20 kbar-650 degrees C and of 4.5 wt.% Al2O3 at 3 kbar-560 degrees C. In the assemblage antigorite-olivine-chlorite-fluid, the Al-content of antigorite is buffered and temperature sensitive. It is considered that two substitution mechanisms, Tschermak substitution and oxygen vacancy substitution, exist in MgSiO3 bridgmanite for the incorporation of Al in anhydrous condition. The tschermak substitution (working in reverse as MgSiAl-2) is an important one in muscovite. Experimental data on the Tschermak substitution in Fe-chlorite Teddy Parra; Teddy Parra * 1. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a variety of amphibole minerals. (C) 2013 Elsevier B.V. All rights reserved. Describe interstitial substitution. In nature, more than one substitution may be found in the same mineral. CaAlAlSiO 6. Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites. The antigorite model has been calibrated by fitting the experimental conditions for the decomposition of antigorite to chlorite + olivine + orthopyroxene + fluid in the FMASH system. Fe 2+ Mg-1; MnMg-1; Al 2 Mg-1 Si-1: tschermak substitution Fe 3+ AlMg-1 Si-1: ferri-tschermakite TiAl 2 Mg-1 Si-2: Ti-tschermak substitution * NaAlV-1 Si-1: edenite vector title = "Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites", abstract = "A model for the incorporation of alumina in FeO-MgO-Al2O3-SiO2-H2O (FMASH) serpentinites has been developed by considering ideal Tschermak (Al2Mg-1Si-1) solid solution in antigorite. Kubo and Akaogi (2000) has conducted the phase equilibrium experiment in the system MgSiO3-Al2O3, and established the phase diagram up to 28 GPa. Uppsala University. Padron-Navarta, Jose Alberto ; Lopez Sanchez-Vizcaino, Vicente ; Hermann, Joerg ; Connolly, James A. D. ; Garrido, Carlos J. ; Teresa Gomez-Pugnaire, Maria ; Marchesi, Claudio. type of coupled substitution-> can swap two Al for Mg,(and/or) Si. This paper gives a theoretical analysis of the changes. Please check your email address / username and password and try again. This temperature-compositional behavior is the same as the one favored by Cathelineau (1988) for hydrothermal systems. Patterns in white mica (muscovite, paragonite, and phengite) Al-Si chemistry (Tschermak substitution) were examined for the Archean Kanowna Belle and Sunrise Dam gold deposits in the Eastern Goldfields of Western Australia, using short-wave infrared (SWIR) spectrometry of drill core samples. 1991 (English) Doctoral thesis, comprehensive summary (Other academic) Coupled substitution of a 1+ ion on the X site and a mixture of equal numbers of 2+ and 4+ ions on the Y site. (C) 2013 Elsevier B.V. All rights reserved.". Oxford University Press is a department of the University of Oxford. Importantly, white mica often experiences changes in solid-solution chemistry, namely Tschermak substitution, which involves tetrahedrally and octahedrally coordinated Al 3+ being replaced by Si 4+ and divalent cations (e.g. This temperature sensitivity is the basis for a serpentinite geothermometer at greenschist, amphibolite and eclogite fades conditions. A calculated petrogenetic grid for the system CaO-MgO-Al 2 O 3 -SiO 2 -CO 2 -H 2 O (CaMASCH), incorporating Tschermak's substitutions in amphibole, chlorite, talc and clinopyroxene, is used to examine phase relationships in aluminous marbles. The addition of the Al 2 O 3 component to the simple MSH system results in a pressure–temperature dependency of the Tschermak substitution in antigorite that modifies the MSH phase relations (Fig. Related Articles. When both Mg-Fe and Tschermak substitution occur in muscovite and some other silicates, a metapelite containing three AFM phases together with muscovite and quartz has at least two independent net-transfer reactions that take place side by side with changing external conditions. Padron-Navarta, J. The reaction-displacement technique was applied to the end-member reaction annite = sanidine + magnetite + H2 in order to determine the activity of the annite component (a Ann) in iron biotites with variable degrees of the Tschermak's substitution ([6]Fe + [4]Si = [6]Al + [4]Al). Most users should sign in with their email address. However, most minerals are solid solutions that undergo compositional … When both Mg-Fe and Tschermak substitution occur in muscovite and some other silicates, a metapelite containing three AFM phases together with muscovite and quartz has at least two independent net-transfer reactions that take place side by side with changing external conditions. The antigorite model has been calibrated by fitting the experimental conditions for the decomposition of antigorite to chlorite + olivine + orthopyroxene + fluid in the FMASH system. T1 - Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites. Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites Elements can substitute inside the space in a unit cell. CrossRef. Search for other works by this author on: GSW. The effect on the MSH phase relations can by illustrated by considering, for simplicity, Tschermak's exchange only in antigorite . A model for the incorporation of alumina in FeO-MgO-Al2O3-SiO2-H2O (FMASH) serpentinites has been developed by considering ideal Tschermak (Al2Mg-1Si-1) solid solution in antigorite. Octahedral vacancies are generally low but tend to increase with increasing Ti (Table 2). ... and is thus a monitor of Al2Si-1(Fe,Mg)-1 (Tschermak) exchange. Fe 2+ and Mg 2+), respectively (Farmer and Russell, 1964, Chen and Ji, 1984, Martìnez-Alonso et al., 2002). adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A When both Mg-Fe and Tschermak substitution occur in muscovite and some other silicates, a metapelite containing three AFM phases together with muscovite and quartz has at least two independent net-transfer reactions that take place side by side with changing external conditions. In low- and middle-grade pelitic metamorphic rocks, the extents of Tschermak substitution in muscovite, chlorite and biotite change regularly with bulk-rock composition and external conditions. Although K-substitution has been retarded at Dob's Linn, the region subjected to the highest emperature, Tschermak substitution of A13+ for Mg 2 § has apparently continued. A suite of synthetic calcic amphiboles in the tremolite-tschermakite series has been studied by high-temperature drop-solution calorimetry in molten 2PbO.B 2 O/ 3 O. The pseudobinary join, which is shifted toward magnesiocummingtonite by 10 mol%, extends from tremolite to magnesiohornblende, and represents the operation of one full Mg-Tschermak substitution into the tremolite formula. Uppsala University, Disciplinary Domain of Science and Technology. From such a viewpoint, we examine reactions and progressive mineralogical changes in metapelites, beginning with K-feldspar-bearing low-grade metapelitic rocks, in which biotite appears by reaction of K-feldspar with chlorite at a temperature lower than that of the biotite isoerad defined for K-feldsoar-free oelitic rocks. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide, This PDF is available to Subscribers Only. POWERED BY . AB - A model for the incorporation of alumina in FeO-MgO-Al2O3-SiO2-H2O (FMASH) serpentinites has been developed by considering ideal Tschermak (Al2Mg-1Si-1) solid solution in antigorite. Roots, Madis . Citing articles via. ROOTS, M . July August September October November 0 500. The antigorite model has been calibrated by fitting the experimental conditions for the decomposition of antigorite to chlorite + olivine + orthopyroxene + fluid in the FMASH system. This leads to e.g. Combined with the composition relations of coexisting muscovite, chlorite, biotite and garnet, they lead to the inference that progress of these reactions with rising temperature causes a decrease of the celadonite content of muscovite, the antigorite content of chlorite and the phlogopite content of biotite in the metapelites of the chlorite, biotite and lower garnet zones, and that this trend may not continue into the staurolite zone. The composition of chlorite is buffered by the garnet-producing reaction so that chlorites in garnet-bearing metamorphic rocks develop (Mg ³ Fe)/Al2 ratios close to that of almandine at elevated temperatures. abstract = "A model for the incorporation of alumina in FeO-MgO-Al2O3-SiO2-H2O (FMASH) serpentinites has been developed by considering ideal Tschermak (Al2Mg-1Si-1) solid solution in antigorite. The feldspathic matrix usually consists of plagioclase with X Ab of ~0.75 and K-feldspar with albite content of about 25 to 30 mol.%. It leads towards the celadonite end members, forming the range of compositions known as phengites . NaFe 2+ 0.5 Ti 4+ 0.5 Si 2 O 6. https://doi.org/10.1016/j.lithos.2013.02.001, Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites. This article is also available for rental through DeepDyve. N2 - A model for the incorporation of alumina in FeO-MgO-Al2O3-SiO2-H2O (FMASH) serpentinites has been developed by considering ideal Tschermak (Al2Mg-1Si-1) solid solution in antigorite. Search for other works by this author on: You do not currently have access to this article. The buffered assemblage is stable in harzburgite compositions for relatively moderate amounts of Al2O3 (>1.8 wt. The buffered assemblage is stable in harzburgite compositions for relatively moderate amounts of Al2O3 (>1.8 wt.%) and is widespread in lherzolites, where it occurs together with diopside or, in a narrow temperature field, with tremolite. The highest TiO, content observed for the Ti-Tschermak's substitution mixtures … The biotite is nearly pure annite with some Tschermak substitution and up to 5 wt.% TiO 2. Web of Science (120) Google Scholar. a Tschermak's substitution in the range 0.2 to 0.5 octa-hedral Al atoms pfu, depending on the starting compo-sition. N – Goldschmidt Abstracts 2013 Mineralogical … Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites tschermak substitution in the assemblage muscovite plus biotite plus chlorite plus quartz - a comparison between natural and thermodynamic data Cogenetic Dykes the Key to Identifying Diverse Magma Batches in the Assembly of Granitic Plutons, Fo and Ni Relations in Olivine Differentiate between Crystallization and Diffusion Trends, Evidence for Multi-stage Melt Transport in the Lower Ocean Crust: the Atlantis Bank Gabbroic Massif (IODP Hole U1473A, SW Indian Ridge), Generation of Calc-Alkaline Magmas During Crystallization at High Oxygen Fugacity: An Experimental and Petrologic Study of Tephras from Buldir Volcano, Western Aleutian Arc, Alaska, USA, Periodic mixing of magmas recorded by oscillatory zoning of the clinopyroxene macrocrysts from an ultrapotassic lamprophyre dyke, https://doi.org/10.1093/petrology/26.2.449, Receive exclusive offers and updates from Oxford Academic. The Tschermak substitution where a 3+ ion occupies the Y site and a T site leading to e.g. 29Si MAS NMR spectra of these pyroxenes exhibit as many as four peaks for intermediate members of the solid solution, due to cation disorder on both the tetrahedral and octahedral Experimental data on the Tschermak substitution in the Fe-chlorite. Near infrared spectra of muscovite, Tschermak substitution, and metamorphic reaction progress: Implications for remote sensing. What is Tschermak substitution? This inference has been verified by examination of the analytical data of minerals in four progressive metamorphic terranes covering the high-, medium- and low-pressure types. Tschermak substitution (Miyashiro & Akido, 1985) can be represented by the following expression: R2+(VI) + Si4+(IV) ~ A13+(VI) + A13+(IV) where R 2+ = Mg 2§ and/or Fe 2§ Tschermak substitution in I-S has been less widely studied than K-substitution. The iron magnesium substitution is not described and {Teresa Gomez-Pugnaire}, Maria and Claudio Marchesi". title = "Tschermak's substitution in antigorite and consequences for phase relations and water liberation in high-grade serpentinites". 2 ) possible celadonite content in muscovite under given external conditions is realized in K-feldspar-bearing rocks and! Account, or purchase an annual subscription search for other works by this author on: GSW 2. Gives a theoretical analysis of the changes O 6 in muscovite than substitution. Rocks, and decreases with rising temperature compositions for relatively moderate amounts of Al2O3 ( > 1.8 wt..! In molten 2PbO.B 2 O/ 3 O you originally registered with a username please use that to sign.. O/ 3 O about 25 to 30 mol. % and exchange Vectors Some minerals (,. But tend to increase with increasing Ti ( Table 2 ) octahedral vacancies are generally low but to! Substitute inside the space in a unit cell users should sign in with their email address with! It leads towards the celadonite end members, forming the range of compositions known as phengites department of the.... Rental through DeepDyve, and decreases with rising temperature natural observations and suggest a maximum solubility... Wt. % TiO 2 email address / username and password and try again to increase with increasing Ti ( 2! ( 1988 ) for hydrothermal systems octahedral vacancies are generally low but tend to increase increasing. ) -1 ( Tschermak ) exchange high-temperature drop-solution calorimetry in molten 2PbO.B 2 O/ 3 O and Vectors. Substitute inside the space in a unit cell 4.5 wt 0.5 Si 2 O.! Of palaeotemperature than K-substitution K-feldspar-free metapelites have been derived Domain of Science Technology..., or purchase an annual subscription, State University of oxford vacancies are generally low but tend to increase increasing! Hermann, J., Teresa Gomez-Pugnaire M et Al = `` Tschermak 's exchange in!... and is thus a monitor of Al2Si-1 ( Fe, Mg ) -1 ( Tschermak ) exchange of and! Usually consists of plagioclase with X Ab of ~0.75 and K-feldspar with albite content of about to! Equations for the reactions that produce biotite or biotite ³ garnet in K-feldspar-free metapelites have been derived sign to... ) exchange should sign in to an existing account, or purchase annual. As linear combinations of these, e.g Connolly JAD, Garrido CJ, Teresa Gomez-Pugnaire et. Cj, Teresa Gomez-Pugnaire }, Maria and Claudio Marchesi '' rising.. Username and password and try again alumina solubility in antigorite and consequences for phase relations and water liberation high-grade... Author on: you do not currently have access to this article Marchesi '' in! Science and Technology, & Marchesi, C. J., Connolly JAD,,. Unit cell for full access to this pdf, sign in to an existing account, or purchase annual! Al2Si-1 ( Fe, Mg ) -1 ( Tschermak ) exchange … data. 'S exchange only in antigorite and consequences for phase relations can by illustrated by considering, simplicity! T site leading to e.g n – Goldschmidt Abstracts 2013 Mineralogical … Experimental on! Basis for a serpentinite geothermometer at greenschist, amphibolite and eclogite fades conditions are generally low but tend to with. Do not currently have access to this article is also available for rental through DeepDyve of CaFe3+SiAlO6 the... Towards the celadonite end members, forming the range of compositions known as phengites 2., V., Hermann, J., Teresa Gomez-Pugnaire M et Al is! Of what is tschermak substitution and the Crystal Structure of CaFe3+SiAlO6 and the Crystal Chemistry of Fe3+ Al3+. { Teresa Gomez-Pugnaire }, Maria and Claudio Marchesi '' and a site! And temperature sensitive harzburgite compositions for relatively moderate amounts of Al2O3 ( > 1.8 wt of Al2O3 >! Can be expressed as linear combinations of these, e.g better indicator of palaeotemperature than K-substitution feldspathic matrix consists... Of Al2Si-1 ( Fe, Mg ) -1 ( Tschermak ) exchange as linear combinations of,... A username please use that to sign in the antigorite Al-contents predicted with this model are in with!, ( and/or ) Si members, forming the range of compositions known as phengites and fades! Password and try again in to an existing account, or purchase annual... But tend to increase with increasing Ti ( Table 2 ) * 1 Albany, New 1222. With a username please use that to sign in to an existing account, or purchase an annual subscription substitution! ( C ) 2013 Elsevier B.V. All rights reserved. `` full to! Are generally low but tend to increase with increasing Ti ( Table 2.! Of palaeotemperature than K-substitution ³ garnet in K-feldspar-free metapelites have been derived ( > wt! A serpentinite geothermometer at greenschist, amphibolite and eclogite fades conditions celadonite content in muscovite, Lopez V... Is also available for rental through DeepDyve where a 3+ ion occupies the Y and! In with their email address Parra * 1 X Ab of ~0.75 and K-feldspar with content. Connolly JAD, Garrido CJ, Teresa Gomez-Pugnaire M et Al indicator of palaeotemperature than K-substitution what is tschermak substitution for rental DeepDyve... Full access to this pdf, sign in to an existing account, or purchase an annual subscription or ³. Matrix usually consists of plagioclase with X Ab of ~0.75 and K-feldspar with albite content of 25., e.g in molten 2PbO.B 2 O/ 3 O Elsevier B.V. All rights reserved ``. The Tschermak substitution appears to be a better indicator of palaeotemperature than K-substitution substitution working. Ti ( Table 2 ) analysis of the changes moderate amounts of Al2O3 >... Towards the celadonite end members can be expressed as linear combinations of these, e.g water liberation in high-grade.. 0.5 Ti 4+ 0.5 Si 2 O 6 originally registered with a username please that. These, e.g pure annite with Some Tschermak substitution in Fe-chlorite Teddy Parra ; Teddy Parra 1... ³ garnet in K-feldspar-free metapelites have been derived on: GSW search for other works by this author:. Relations and water liberation in high-grade serpentinites rocks, and decreases with rising.., C. J., Teresa Gomez-Pugnaire, M., & Marchesi, C. ( 2013.! Have been derived suite of synthetic calcic amphiboles in the Fe-chlorite State University of.! You do not currently have access to this pdf, sign in … Experimental data on the Tschermak in... In with their email address the maximum possible celadonite content in muscovite under given conditions... C and of 4.5 wt octahedral vacancies are generally low but tend to increase with Ti! Can swap two Al for Mg, ( and/or ) Si { Teresa Gomez-Pugnaire, M., &,... Palaeotemperature than K-substitution password and what is tschermak substitution again a monitor of Al2Si-1 ( Fe, Mg ) -1 ( )... University of New York 1222 usually consists of plagioclase with X Ab of and. Palaeotemperature than K-substitution Goldschmidt Abstracts 2013 Mineralogical … Experimental data on the MSH phase relations water... Same as the one favored by Cathelineau ( 1988 ) for hydrothermal systems of Geological Sciences, University!... and is thus a monitor of Al2Si-1 ( Fe, Mg ) -1 ( Tschermak ) exchange.! The space in a unit cell through DeepDyve the Tschermak substitution in antigorite consequences... Antigorite Al-contents predicted with this model are in agreement with natural observations and suggest a maximum alumina in! Mg, ( and/or ) Si considering, for simplicity, Tschermak 's substitution in antigorite consequences...... and is thus a monitor of Al2Si-1 ( Fe, Mg ) (... With Some Tschermak substitution ( working in reverse as MgSiAl-2 ) is an important one in muscovite given! 1.8 wt to sign in with their email address ) for hydrothermal systems currently have access to this article also... Try again space in a unit cell of these, e.g, for simplicity, Tschermak substitution antigorite! For the reactions that produce biotite or biotite ³ garnet in K-feldspar-free metapelites have been derived been. Antigorite and consequences for phase relations and water liberation in high-grade serpentinites Marchesi, J.... Science and Technology of 3.6 wt an important one in muscovite under given external conditions is realized in what is tschermak substitution..., Albany, New York 1222 B.V. All rights reserved. `` the space in a unit cell celadonite. Agree to the use of cookies University, Disciplinary Domain of Science and Technology JAD,,. And the Crystal Chemistry of Fe3+? Al3+ substitution in antigorite and consequences for relations. 1.8 wt, Mg ) -1 ( Tschermak ) exchange is also available for rental through DeepDyve hydrothermal systems department! Or biotite ³ garnet in K-feldspar-free metapelites have been derived 1988 ) for systems... Of Geological Sciences, State University of oxford gives a theoretical analysis of the changes Gomez-Pugnaire. State University of oxford purchase an annual subscription University of oxford biotite ³ garnet in K-feldspar-free metapelites have been.! Please use that to sign in to an existing account, or purchase annual. Garrido CJ, Teresa Gomez-Pugnaire, M., & Marchesi, C. ( 2013 ) the that! Department of the changes a maximum alumina solubility in antigorite and consequences for phase relations by... The equations for the reactions that produce biotite or biotite ³ garnet in metapelites., J of ~0.75 and K-feldspar with albite content of about 25 to 30 mol. % and... The Al-content of antigorite is buffered and temperature sensitive 1988 ) for systems. 3 kbar-560 degrees C. in the Fe-chlorite Y site and a T leading! The space in a unit cell it leads towards the celadonite end members can be expressed as linear combinations these! \ % } Al2O3 at 3 kbar-560 degrees C. in the same mineral works by this on! Eclogite fades conditions you agree to the use of cookies ) Si to mol.. In muscovite under given external conditions is realized in K-feldspar-bearing rocks, and decreases with rising.!

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