Этапы формирования и эволюции континентальной коры Сонгинского блока раннекаледонского супертеррейна Центральной Азии: II. Геохимические и Nd-изотопные данные

Ковач, В. П.; Козаков, И. К.; Сальникова, Е. Б.; Ярмолюк, В. В.; Козловский, А. М.; Терентьева, Л. Б.

doi:10.7868/s0869590313050026

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“…ков, из которых формировались протолиты парагнейсов. Следует добавить, что пока нет однозначного решения этого вопроса: в большей степени в литературе приводятся [2,3,5,7,11,15,44] Моделирование метаморфического минералообразования производилось на основе петрологической программы THERIAK-DOMINO [31,32] с использованием модифицированной (http://titan.minpet. unibas.ch/) термодинамической базы данных минералов [26,27] и твердых растворов [28,29]…”

Section: краткая характеристика положения ларбинского блока в структу...unclassified

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Yurchenko,

Baltybaev,

Volkova

et al. 2024

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The article focuses on the issues related to the primary nature and metamorphism of gneisses from the Larba block of the Dzhugdzhur-Stanovoy fold area, which are based on the study of the mineralogical composition of supracrustal rocks. PT-parameters for the highest temperature and pressure metamorphic transformations of rocks of the Larba block are estimated as P = 6.5–8.5 kbar and T > 800°C. Relatively low-temperature garnet-biotite, garnet-biotite-chlorite mineral parageneses were formed at the regressive stage of metamorphism at ~4–6 kbar and temperatures up to 500–600°C. Wide variations in paragneiss compositions indicate that protoliths of the studied gneisses differed in composition. Overall, Larba metasedimentary rocks had weakly and moderately weathered source areas. Most of the compositions of paragneisses are localized in the field of chlorite-montmorillonite, montmorillonite-kaolinite-hydromica and chlorite clays formed from the mafic substrate. Low alkalinity in combination with a high MgO content indicates the presence of rock erosion products with a significant admixture of basic volcanic material in the detrital material. Migmatization of rocks is the most significant factor distorting the reconstruction of the original rock composition.

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Section: краткая характеристика положения ларбинского блока в структу...unclassified

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Yurchenko,

Baltybaev,

Volkova

et al. 2024

View full text Add to dashboard Cite

show abstract

Этапы формирования и эволюции континентальной коры Сонгинского блока раннекаледонского супертеррейна Центральной Азии: II. Геохимические и Nd-изотопные данные

Cited by 1 publication

References 0 publications

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

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