litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2021-21-6-867-883litosphere-1509Research ArticleСтатьиArticlesЛавсонитовые эклогиты и метасоматиты Утарбаевской ассоциации максютовского комплексаLawsonite eclogites and metasomatites of the Utarbaev Association of the Maksyutov complexРусинА. И.RusinA. I.

620110, г. Екатеринбург, ул. Акад. Вонсовского, 15

15 Akad. Vonsovsky st., Ekaterinburg 620110

anj1789@rambler.ruЗворыгинаА. А.ZvoryginaA. A.

620110, г. Екатеринбург, ул. Акад. Вонсовского, 15

15 Akad. Vonsovsky st., Ekaterinburg 620110

ВализерП. М.ValizerP. M.

456317, г. Миасс

Miass 456317

valizer@ilmeny.ac.ruИнститут геологии и геохимии УрО РАНРоссияA.N. Zavaritsky.Institute of Geology and Geochemistry, Ural Branch of RASRussian FederationИльменский государственный заповедник, ЮУ ФНЦ МиГ УрО РАНРоссияIlmen State Reserve, SU FRC MG UB RAS, Ilmeny State ReserveRussian Federation202129122021216867883Copyright © Русин А.И., Зворыгина А.А., Вализер П.М., 20212021Русин А.И., Зворыгина А.А., Вализер П.М.Rusin A.I., Zvorygina A.A., Valizer P.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1509Объект исследований

Объект исследований. Лавсонитовые эклогиты и метасоматиты Утарбаевской ассоциации максютовского комплекса. Утарбаевская ассоциация слагает самостоятельное подразделение в аккреционной структуре максютовского комплекса. Она представлена глыбообразными телами диопсид-гроссуляровых и разнообразных лавсонитсодержащих пород, включенных в антигорит-серпентинитовый меланж. Отсутствие в минеральных парагенезисах лавсонитсодержащих пород голубых амфиболов отличает Утарбаевскую ассоциацию от типичных лавсонит-голубосланцевых комплексов коллизионных орогенов.

Методы

Методы. Микрозондовый анализ состава минералов выполнен на микроанализаторе Cameca SX-100. Содержание петрогенных, редких и редкоземельных элементов определено рентгеноспектральным методом (CPM-18) и методом масс-спектроскопии (ICP-MS, ELAN-90).

Результаты

Результаты. Обнаружен индикаторный минеральный парагенезис (Grt + Omp + Lws + Di) ± (Coe-Qz + Ttn), характеризующий лавсонитовый эклогит. Омфацит (Jd38–44) и неизмененный лавсонит (Н2O-OH – 11.8%, Ca/Al = 0.48–0.51 и Fe/Al = 0.01–0.02) представлены в виде включений в гроссуляр-альмандиновом гранате (Alm39–46Grs41–51), коэсит – в виде микровключений в омфаците. Термобарометрия (Grt-Omp, Grt-Omp-Ph) показывает следующие PT-условия образования лавсонитового парагенезиса: T = 495–622°C при P = 2.2–2.4 ГПа. Возраст кристаллизации лавсонитового эклогита нижнепалеозойский (471–444 млн лет).

Выводы

Выводы. Лавсонитовый эклогит Утарбаевской ассоциации имеет определенное сходство с комплексами «холодных» эклогитов, образующихся в условиях очень низкого геотермического градиента и редко сохраняющихся при выведении их в верхнюю кору. В последнем обзоре, сделанном в «Jоurnal of Metamorphic Geo logy» в 2014 г., указывалось 19 пунктов находок лавсонитовых эклогитов на поверхности Земли. HP-UHP лавсонитсодержащая Утарбаевская породная ассоциация дополняет этот список.

Research subject

Research subject. This article presents mineralogical, petrological and geochemical studies of lawsonite eclogites and metasomatites of the Utarbayev Аssociation of the Maksyutov complex. The Utarbayev Association forms an independent unit in the Maksyutovsky complex accretion structure. This Association features a variety of lawsonite-bearing metasomatites that form zonal halos in the frame of block-like diopside-grossular bodies included in the antigorite-serpentinite melange. The Utarbayev Association differs from typical lawsonite-blue shale complexes of collisional oro genes by the absence of mineral parageneses of lawsonite-bearing rocks of blue amphibolites.

Methods

Methods. A microprobe analysis of the mineral composition was performed using a Cameca SX-100 microanalyzer. The content of petrogenic, rare and rare-earth elements was determined by X-ray spectroscopy (CPM-18) and mass spectroscopy (ICP-MS, ELAN-90). Results. An indicator mine ral paragenesis (Grt + Omp + Lws + Di) ± (Coe-Qz + Ttn) that characterizes lawsonite eclogite was found. Omphacite (Jd38–44) and unchanged lawsonite (Н2O-OH – 11.8%, Ca/Al = 0.48–0.51 и Fe/Al = 0.01 0.02%) are represented as inclusions in grossular-almandine garnet (Alm39–46Grs41–51), coesite – as microinclusions in omphacite. Thermobarometry (Grt-Omp, Grt-Omp-Ph) showed the following formation conditions of lawsonite paragenesis: T = 495–622°C under P = 2.2–2.4 GPa. The age of crystallization of lawsonite eclogite was found to be Lower Paleozoic (471–444 Ma).

Conclusions

Conclusions. The lawsonite eclogite of the Utarbayev Association is similar to the complexes of «cold» eclogites, which are formed under the conditions of a very low geothermal gradient and are rarely preserved when removed into the upper crust. The latest review published in the «Journal of Metamorphic Geology» (2014) mentions 19 sites, where lawsonite eclogites were discovered on the earth’s surface. Тhe HP-UHP lawsonitebearing Utarbayev Rock Association complements this list.

лавсонитовые эклогитысерпентинитовый меланжлавсониткоэситУтарбаевская ассоциациямаксютовский комплексlawsonite eclogitesserpentinite mélangelawsonitecoesiteUtarbaev АssociationMaksyutov complexИсследование проведено в рамках государственного задания № АААА-А19-119072990020-6 ИГГ УрО РАН и «Геологическое строение и эволюция структурных единиц южного сегмента зоны ГУР» ИГЗ ЮУ ФНЦ МиГ УрО РАНThis work was carried out within the framework of the state assignment No. АААА-А19-119072990020-6 IGG UB RAS and «Geological structure and evolution of structural units of southern segment of UMF» of SU FRC MG UB RASReferencesВализер П.М., Краснобаев А.А., Русин А.И. (2013) Жадеит-гроссуляровый эклогит максютовского комплекса (Ю. Урал). Литосфера, (4), 52-64.Ballevre M., Pitra P., Bohn M. (2003) Lawsonite growth in the epidote blueschists from the Ile de Groix (Armorican Massif, France): a potential geobarometer. J. Metamorphic Geol., 21, 723-735. DOI: 10.1046/j.1525-1314.2003.00474.xВализер П.М., Краснобаев А.А., Русин А.И., Зворыгина А.А. (2015) Гранат-глаукофановые сланцы Ташлинского блока Максютовского комплекса. Литосфера, (5), 51-70.Bromiley G.D., Pawley A.R. (2003) The stability of antigorite in the systems MgO-SiO2-H2O (MSH) and MgOAl2O3-SiO2-H2O (MASH): The effects of Al3+ substitution on high-pressure stability. Amer. Mineral., 88, 99-108. DOI: 10.2138/am-2003-0113Вализер П.М., Ленных В.И. (1988) Амфиболы голубых сланцев Урала. М.: Наука, 203 с.Brovarone V.A., Alard O., Beyssac L., Martin L., Picatto M. (2014) Lawsonite metasomatism and trace element recycling in subduction zones. J. Metamorph. Geol., 32, 489-514. DOI: 10.1111/jmg.12074Добрецов Н.Л. (1974) Глаукофансланцевые и эклогит-глаукофансланцевые комплексы СССР. Новосибирск: Наука, 429 с.Brovarone V.A., Groppo C., Hetényi G., Compagnoni R., Malavieille J. (2011) Coexistence of lawsonite-bearing eclogite and blueschist: Phase equilibria modelling of Alpine Corsica metabasalts and petrological evolution of subducting slabs. J. Metamorph. Geol., 29, 583-600. DOI: 10.1111/j.1525-1314.2011.00931.xЛенных В.И. (1977) Эклогит-глаукофановый пояс Южного Урала. М.: Наука, 160 с.Castelli D., Rolfo F., Compagnoni R., Xu S. (1998) Metamorphic veins with kyanite, zoisite and quartz in the Zhu-Jia-Chong eclogite, Dabie Shan, China. Island Arc, 7, 159-173. DOI: 10.1046/j.1440-1738.1998.00185.xРусин А.И. (2007) Высокобарический метаморфизм Урала. Геодинамика, магматизм, метаморфизм и рудообразование. Екатеринбург: ИГГ УрО РАН, 421-460.Chen Y., Ye K., Wu T.F., Guo S. (2013) Exhumation of oceanic eclogites: thermodynamic constraints on pressure, temperature, bulk composition and density. J. Metamorph. Geol., 31, 549-570.Русин А.И., Вализер П.М., Русин И.А. (2014) HP-UHP ассоциации континентальной рифтовой и коллизионной стадий формирования Урала. Геологические процессы в обстановках субдукции, коллизии и скольжения литосферных плит. Владивосток: Дальнаука, 246-249.Clarke G.L., Powell R., Fitzherbert I.A. (2006) The lawsonite paradox: a comparison of field evidence and mineral equilibria modelling. J. Metamorph. Geol., 24, 715-725. DOI: 10.1111/j.1525-1314.2006.00664.xТейлор С.Р., Мак-Леннан С.М. (1988) Континентальная кора: ее состав и эволюция. М.: Мир, 379 с.Comodi P., Zanazzi P.F. (1996) Effects of temperature and pressure on the structure of lawsonite. Amer. Mineral., 81, 833-841.Ballevre M., Pitra P., Bohn M. (2003) Lawsonite growth in the epidote blueschists from the Ile de Groix (Armorican Massif, France): a potential geobarometer. J. Metamorph. Geol., 21, 723-735. DOI: 10.1046/j.1525-1314.2003.00474.xDobretsov N.L. (1974) Glaucophanschist and eclogite-glaucophanschist complexes of the USSR. Novosibirsk, Nauka Publ., 429 p. (In Russ.)Bromiley G.D., Pawley A.R. (2003) The stability of antigorite in the systems MgO–SiO2–H2O (MSH) and MgO–Al2O3–SiO2–H2O (MASH): The effects of Al3+ substitution on high-pressure stability. Amer. Mineral., 88, 99-108. DOI: 10.2138/am-2003-0113Dobretsov N.L. (2000) Collision processes in Paleozoic foldbelts of Asia and exhumation mechanisms. J. Petrol., 8(5), 403-427.Brovarone V.A., Alard O., Beyssac L., Martin L., Picatto M. (2014) Lawsonite metasomatism and trace element recycling in subduction zones. J. Metamorph. Geol., 32, 489-514. DOI: 10.1111/jmg.12074Enami M., Liou J.G., Mattinson C.G. (2004) Epidote Minerals in High P/T Metamorphic Terranes: Subduction Zone and High- to Ultrahigh-Pressure Metamorphism. Rev. Mineral. Geochem., 56, 347-398. DOI: 10.2138/gsrmg.56.1.347Brovarone V.A., Groppo C., Hetényi G., Compagnoni R., Malavieille J. (2011) Coexistence of lawsonite-bearing eclogite and blueschist: Phase equilibria modelling of Alpine Corsica metabasalts and petrological evolution of subducting slabs. J. Metamorph. Geol., 29, 583-600. DOI: 10.1111/j.1525-1314.2011.00931.xEndo S., Wallis S.R., Tsuboi M., Torres de Leon R., Solari L.A. (2012) Metamorphic evolution of lawsonite eclogites from the southern Motagua fault zone, Guatemala. J. Metamorph. Geol., 30, 143-164. DOI:10.1111/j.1525-1314.2011.00960.xCastelli D., Rolfo F., Compagnoni R., Xu S. (1998) Metamorphic veins with kyanite, zoisite and quartz in the Zhu-Jia-Chong eclogite, Dabie Shan, China. Island Arc, 7, 159-173. DOI: 10.1046/j.1440-1738.1998.00185.xErnst W.G. (1977) Tectonics and prograde versus retrograde P-T trajectories of high-pressure metamorphic belts. Rendicont Societa Italiana di Mineralogia e Petrologia, 33(1), 191-220.Chen Y., Ye K., Wu T.F., Guo S. (2013) Exhumation of oceanic eclogites: thermodynamic constraints on pressure, temperature, bulk composition and density. J. Metamorph. Geol., 31, 549-570.Groppo C., Castelli D. (2000) Prograde P-T evolution of a lawsonite eclogite from the Monsivo Meta-ophiolite (Western Alps). J. Petrol., 51(12), 2489-2504. DOI: 10.1093/petrology/egq065Clarke G.L., Powell R., Fitzherbert I.A. (2006) The lawsonite paradox: a comparison of field evidence and mineral equilibria modelling. J. Metamorph. Geol., 24, 715-725. DOI: 10.1111/j.1525-1314.2006.00664.xHelmstaedt H., Doig R. (1975) Eclogite nodules from kimberlite pipes of the Colorado Plateau-samples of subducted Franciscan-type oceanic lithosphere. Phys. Chem. Earth, 9, 95-112. DOI: https://doi.org/10.29173/ikc876Comodi P., Zanazzi P.F. (1996) Effects of temperature and pressure on the structure of lawsonite. Amer. Mineral., 81, 833-841.Helmstaedt H.H., Schulze D.J. (1991) Early to Mid-Tertiary Inverted Metamorphic Gradient Under the Colorado Plateau: Evidence From Eclogite Xenoliths in Ultramafic Microbreccias, Navajo Volcanic Field. J. Geophys. Res., 96(B8), 13225-13235. DOI: 10.1029/91JB00284Dobretsov N.L. (2000) Collision processes in Paleozoic foldbelts of Asia and exhumation mechanisms. J. Petrol., 8(5), 403-427.Ivanov S., Ivanov K. (1993) Hydrodynamic zoning of the Earth’s crust and its significance. J. Geodynam., 17, 155-180.Enami M., Liou J.G., Mattinson C.G. (2004) Epidote Minerals in High P/T Metamorphic Terranes: Subduction Zone and High- to Ultrahigh-Pressure Metamorphism. Rev. Mineral. Geochem., 56, 347-398. DOI: 10.2138/gsrmg.56.1.347Ivanov S.N., Krasnobayev A.A., Rusin A.I. (1986) Geodinamic regimes in the precambrian of the Urals. Precambr. Res., 33, 198-208.Endo S., Wallis S.R., Tsuboi M., Torres de Leon R., Solari L.A. (2012) Metamorphic evolution of lawsonite eclogites from the southern Motagua fault zone, Guatemala. J. Metamorph. Geol., 30, 143-164. DOI: 10.1111/j.1525-1314.2011.00960.xIvanov S.N., Rusin A.I. (1997) Continental rift metamorphism. Geotectonics, (1), 3-15.Ernst W.G. (1977) Tectonics and prograde versus retrograde P-T trajectories of high-pressure metamorphic belts. Rendicont Societa Italiana di Mineralogia e Petrologia, 33(1), 191-220.Lennykh V.I. (1977) Eclogite-glaucophane belt of the Southern Urals. Moscow, Nauka Publ., 160 p. (In Russ.)Groppo C., Castelli D. (2000) Prograde P-T evolution of a lawsonite eclogite from the Monsivo Meta-ophiolite (Western Alps). J. Petrol., 51(12), 2489-2504. DOI: 10.1093/petrology/egq065Lennykh V.I., Valizer P.M. (1999) High-pressure rocks of the Maksyutov complex (Southern Urals) 4th International Eklogite field sumposium. Novosibirsk, OIGGM SB RAS, 64.Helmstaedt H., Doig R. (1975) Eclogite nodules from kimberlite pipes of the Colorado Plateau-samples of subducted Franciscan-type oceanic lithosphere. Phys. Chem. Earth, 9, 95-112. DOI: https://doi.org/10.29173/ikc876Martin L.A.J., Rubatto D., Brovarone A.V., Hermann J. (2011) Late Eocene lawsonite-eclogite facies metasomatism of a granulite sliver associated to ophiolites in Alpine Corsica. Lithos, 125, 620-640. DOI.org/10.1016/j.lithos.2011.03.015Helmstaedt H.H., Schulze D.J. (1991) Early to Mid-Tertiary Inverted Metamorphic Gradient Under the Colorado Plateau: Evidence From Eclogite Xenoliths in Ultramafic Microbreccias, Navajo Volcanic Field. J. Geophys. Res., 96(B8), 13225-13235. DOI: 10.1029/91JB00284Miyashiro A. (1961) Evolution of metamorphic belts. J. Petrol., 2, 277-311.Ivanov S., Ivanov K. (1993) Hydrodynamic zoning of the Earth’s crust and its significance. J. Geodynam., 17, 155-180.Okamoto K., Maruyama S. (1999) The high-pressure synthesis of lawsonite in the MORB + H2O system. Amer. Mineral., 84, 362-373. DOI: 10.2138/am-1999-0320Ivanov S.N., Krasnobayev A.A., Rusin A.I. (1986) Geodinamic regimes in the precambrian of the Urals. Precambr. Res., 33, 198-208.Pawley A. (1994) The pressure and temperature stability limits of lawsonite: Implications for H2O recycling in subduction zones. Contrib. Mineral. Petrol., 1(18), 99-108. DOI:10.1007/BF00310614Ivanov S.N., Rusin A.I. (1997) Continental rift metamorphism. Geotectonics, (1), 3-15.Poli S., Schmidt M.W. (1998) The high-pressure stability of zoisite and phase relationships of zoisite-bearing assemblages. Contrib. Mineral. Petrol., 130, 162-175.Lennykh V.I., Valizer P.M. (1999) High-pressure rocks of the Maksyutov complex (Southern Urals) Fourth International Eklogite field sumposium. Novosibirsk, OIGGM SB RAS, 64.Ravna E.J. (2000) The garnet-chlinopyroxene geothermometer – an updated calibration. J. Metamorph. Geol., 18, 211-219.Martin L.A.J., Rubatto D., Brovarone A.V., Hermann J. (2011) Late Eocene lawsonite-eclogite facies metasomatism of a granulite sliver associated to ophiolites in Alpine Corsica. Lithos, 125, 620-640. DOI.org/10.1016/j.lithos.2011.03.015Ravna E.J., Andersen B., Jolivet L., De Capitani C. (2010) Cold subduction and the formation of lawsonite eclogite – constraints from prograde evolution of eclogitized pillow lava from Corsica. J. Metamorph. Geol., 28, 381-395. DOI: 10.1111/j.1525-1314.2010.00870.xMiyashiro A. (1961) Evolution of metamorphic belts. J. Petrol., 2, 277-311.Ravna E.J., Paquin J. (2003) Thermobarometric methodologies applicable to eclogites and garnet ultrabasites. EMU Notes Mineral., 5(8), 229-259.Okamoto K., Maruyama S. (1999) The high-pressure synthesis of lawsonite in the MORB + H2O system. Amer. Mineral., 84, 362-373. DOI: 10.2138/am-1999-0320Ravna E.J., Terry M.P. (2004) Geothermobarometry of UHP and HP eclogites and schists-an evaluation of equilibria among garnet-clinopyroxene-kyanite-phengitecoesite/quartz. J. Metamorph. Geol., 22, 579-592. DOI: 10.1111/j.1525-1314.2004.00534.xPawley A. (1994) The pressure and temperature stability limits of lawsonite: Implications for H2O recycling in subduction zones. Contrib. Mineral. Petrol., 1(18), 99-108. DOI:10.1007/BF00310614Rusin A.I. (2007) High-pressure metamorphism of the Urals. Geodynamics, magmatism, metamorphism and ore formation. Ekaterinburg, IGG UrO RAN, 421-460. (In Russ.)Poli S., Schmidt M.W. (1998) The high-pressure stability of zoisite and phase relationships of zoisite-bearing assemblages. Contrib. Mineral. Petrol., 130, 162-175.Rusin A.I., Valizer P.M., Rusin I.A. (2014) HP-UHP associations of the continental rift and collision stages of the Urals formation. Geological processes in environments of subduction, collision and sliding of lithosphe ric plates). Vladivostok, Dalʼnauka Publ., 246-249. (In Russ.)Ravna E.J. (2000) The garnet-chlinopyroxene geothermometer – an updated calibration. J. Metamorph. Geol., 18, 211-219.Schmidt M.W. (1995) Lawsonite: Upper pressure stability and formation of higher density hydrous phases. Amer. Mineral., 80, 1286-292.Ravna E.J., Andersen B., Jolivet L., De Capitani C. (2010) Cold subduction and the formation of lawsonite eclogite – constraints from prograde evolution of eclogitized pillow lava from Corsica. J. Metamorph. Geol., 28, 381-395. DOI: 10.1111/j.1525-1314.2010.00870.xSchmidt M.W., Poli S. (1994) The stability of lawsonite and zoisite at high pressures: Experiments in CASH to 92 kbar and implications for the presence of hydrous phases in subducted lithosphere. Earth Planet. Sci. Lett., 124, 105-118.Ravna E.J., Paquin J. (2003) Thermobarometric methodologies applicable to eclogites and garnet ultrabasites. EMU Notes Mineral., 5(8), 229-259.Song S., Niu Y., Zhang L., Wei C., Liou J.G., Su L. (2009) Tectonic evolution of early Paleozoic Hp Metamorphic rocks in the north Qilian Mountains. J. Asian Earth Sci., 35, 334-353. DOI: 10.1016/j.jseaes.2008.11.005Ravna E.J., Terry M.P. (2004) Geothermobarometry of UHP and HP eclogites and schists-an evaluation of equilibria among garnet-clinopyroxene-kyanite-phengitecoesite/quartz. J. Metamorph. Geol., 22, 579-592. DOI: 10.1111/j.1525-1314.2004.00534.xSun S.-S., McDonough R.L. (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geol. Soc. Spec. Publ., 42, 313-345. DOI: 10.1144/GSL.SP.1989.042.01.19Schmidt M.W. (1995) Lawsonite: Upper pressure stability and formation of higher density hydrous phases. Amer. Mineral., 80, 1286-292.Teilor S.R., Mak-Lennan S.M. (1988) Continental crust: its composition and evolution. Moscow, Mir Publ., 379 p. (In Russ.)Schmidt M.W., Poli S. (1994) The stability of lawsonite and zoisite at high pressures: Experiments in CASH to 92 kbar and implications for the presence of hydrous phases in subducted lithosphere. Earth Planet. Sci. Lett., 124, 105-118.Tsujimori T., Ernst W.G. (2014) Lawsonite blueschists and lawsonite eclogites as proxies for palaeo-subduction zone processes: a review. J. Metamorph. Geol., 32, 437-454. DOI: 10.1111/jmg.12057Song S., Niu Y., Zhang L., Wei C., Liou J.G., Su L. (2009) Tectonic evolution of early Paleozoic Hp Metamorphic rocks in the north Qilian Mountains. J. Asian Earth Sci., 35, 334-353. DOI: 10.1016/j.jseaes.2008.11.005Tsujimori T., Sisson V.B., Liou J.G., Harlow G.E., Sorensen S.S. (2006a) Petrologic characterization of Guatemalan lawsonite eclogite: Eclogitization of subducted oceanic crust in a cold subduction zone. Petrol. Soc. Amer., Spec. Pap., 403, 14-168. DOI: 10.1130/2006.2403(09)Sun S.-S., McDonough R.L. (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geol. Soc. Spec. Publ., 42, 313-345. DOI: 10.1144/GSL.SP.1989.042.01.19Tsujimori T., Sisson V.B., Liou J.G., Harlow G.E., Sorensen S.S. (2006b). Very low-temperature record in subduction process: A review of worldwide lawsonite eclogites. Lithos, 92, 609-624. DOI: 10.1016/j.lithos.2006.03.054Tsujimori T., Ernst W.G. (2014) Lawsonite blueschists and lawsonite eclogites as proxies for palaeo-subduction zone processes: a review. J. Metamorph. Geol., 32, 437-454. DOI: 10.1111/jmg.12057Usui T., Nakamura E., Helmstaedt H. (2006) Petrology and Geochemistry of Eclogite Xenoliths from the Colorado Plateau: Implications for the Evolution of Subducted Oceanic Crust. J. Petrol., 47(5), 929-964. DOI: 10.1093/petrology/egi101Tsujimori T., Sisson V.B., Liou J.G., Harlow G.E., Sorensen S.S. (2006a) Petrologic characterization of Guatemalan lawsonite eclogite: Eclogitization of subducted oceanic crust in a cold subduction zone. Petrol. Soc. Amer., Spec. Pap., 403, 14-168. DOI: 10.1130/2006.2403(09)Valizer P.M., Krasnobaev A.A., Rusin A.I. (2013) Jadeite-grossular eclogite of the Maksyutov complex (South Urals). Lithosphere (Russia), (4), 52-64. (In Russ.)Tsujimori T., Sisson V.B., Liou J.G., Harlow G.E., Sorensen S.S. (2006b) Very low-temperature record in subduction process: A review of worldwide lawsonite eclogites. Lithos, 92, 609-624. DOI: 10.1016/j.lithos.2006.03.054Valizer P.M., Krasnobaev A.A., Rusin A.I. (2011) Ultrahigh-pressure (UHP) associations in ultramafites of the Maksutov Complex (Southern Urals). Dokl. Earth Sci., 441(2), 1645-1648. DOI: 10.1134/S1028334X11120087Usui T., Nakamura E., Helmstaedt H. (2006) Petrology and Geochemistry of Eclogite Xenoliths from the Colorado Plateau: Implications for the Evolution of Subducted Oceanic Crust. J. Petrol., 47(5), 929-964. DOI: 10.1093/petrology/egi101Valizer P.M., Krasnobaev A.A., Rusin A.I., Zvorygina A.A. (2015) Garnet-glaucophane schists of the Tashlinsky block of the Maksyutov complex. Lithosphere (Russia), (5), 51-70. (In Russ.)Valizer P.M., Krasnobaev A.A., Rusin A.I. (2011) Ultrahigh-pressure (UHP) associations in ultramafites of the Maksutov Complex (Southern Urals). Dokl. Earth Sci., 441(2), 1645-1648. DOI: 10.1134/S1028334X11120087Valizer P.M., Lennykh V.I. (1988) Amphiboles of blue schists of the Urals. Moscow, Nedra Publ., 203 p. (In Russ.)Valizer P.М., Rusin A.I., Krasnobaev A.A., Likhanov I.I. (2013) Garnet-pyroxene and lawsonite-bearing rocks of the Maksyutov Complex (Southern Urals), Russ. Geol. Geophys., 54(11), 1369-1384.Valizer P.М., Rusin A.I., Krasnobaev A.A., Likhanov I.I. (2013) Garnet-pyroxene and lawsonite-bearing rocks of the Maksyutov Complex (Southern Urals). Russ. Geol. Geophys., 54(11), 1369-1384.Wei C.J., Clarke G.L. (2011) Calculated phase equilibria for MORB compositions: A reappraisal of the metamorphic evolution of lawsonite eclogite. J. Metamorph. Geol., 29, 939-952.Wei C.J., Clarke G.L. (2011) Calculated phase equilibria for MORB compositions: A reappraisal of the metamorphic evolution of lawsonite eclogite. J. Metamorph. Geol., 29, 939-952.Whitney D.U., Evans B.W. (2010) Abbreviations for names of rock-forming minerals. Amer. Mineral., 95, 185-187.Whitney D.U., Evans B.W. (2010) Abbreviations for names of rock-forming minerals. Amer. Mineral., 95, 185-187.Zack T., Rivers T., Brumm R., Kronz A. (2004) Cold subduction of oceanic crust: Implications from a lawsonite eclogite from the Dominican Republic. Eur. J. Mineral., 16, 909-916. DOI: 10.1127/0935-1221/2004/0016-0909Zack T., Rivers T., Brumm R., Kronz A. (2004) Cold subduction of oceanic crust: Implications from a lawsonite eclogite from the Dominican Republic. Eur. J. Mineral., 16, 909-916. DOI: 10.1127/0935-1221/2004/0016-0909Zhang J., Meng F. (2006) Lawsonite-bearing eclogites in the north Qilian and north North Altyn Tagh. Chin. Sci. Bull., 51(10), 1238-1244. DOI: 10.1007/s11434-006-1238-6Zhang J., Meng F. (2006) Lawsonite-bearing eclogites in the north Qilian and north North Altyn Tagh. Chin. Sci. Bull., 51(10), 1238-1244. DOI: 10.1007/s11434-006-1238-6

The authors declare that there are no conflicts of interest present.