gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-3-0441gtcrust-904Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSСООТНОШЕНИЕ МАНТИЙНОГО И РАЗНОВОЗРАСТНОГО КОРОВОГО ВЕЩЕСТВА В СОСТАВЕ ГРАНИТОИДОВ ЗАБАЙКАЛЬЯ А-ТИПА: ПЕТРОЛОГИЧЕСКИЕ И ГЕОДИНАМИЧЕСКИЕ СЛЕДСТВИЯCORRELATION BETWEEN THE MANTLE AND HETEROCHRONOUS CRUSTAL MATERIALS IN THE COMPOSITION OF TRANSBAIKALIA A-TYPE GRANITOIDES: PETROLOGICAL AND GEODYNAMICAL IMPLICATIONSЦыганковА. А.TsygankovA. A.

Цыганков Андрей Александрович - доктор геолого-минералогических наук, директор.

670047, Улан-Удэ, ул. Сахьяновой, 6а; 670000, Улан-Удэ, ул. Смолина, 24а.

Andrei A. Tsygankov - Doctor of Geology and Mineralogy, Director.

6a Sakhyanova street, Ulan-Ude 670047; 24a Smolin street, Ulan-Ude 670000.

tsygan@ginst.ruХубановВ. Б.KhubanovV. B.

Хубанов Валентин Борисович - кандидат геолого-минералогических наук, старший научный сотрудник.

670047, Улан-Удэ, ул. Сахьяновой, 6а; 670000, Улан-Удэ, ул. Смолина, 24а.

Valentin B. Khubanov - Candidate of Geology and Mineralogy, Senior Researcher.

6a Sakhyanova street, Ulan-Ude 670047; 24a Smolin street, Ulan-Ude 670000.

khubanov@mail.ruБурмакинаГ. Н.BurmakinaG. N.

Бурмакина Галина Николаевна кандидат геолого-минералогических наук, научный сотрудник.

670047, Улан-Удэ, ул. Сахьяновой, 6а.

Galina N. Burmakina - Candidate of Geology and Mineralogy, Researcher.

6a Sakhyanova street, Ulan-Ude 670047.

gerka_85@mail.ruЕлбаевА. Л.ElbaevA. L.

Елбаев Алексей Леонидович - кандидат геолого-минералогических наук, научный сотрудник.

670047, Улан-Удэ, ул. Сахьяновой, 6а.

Aleksei L. Elbaev - Candidate of Geology and Mineralogy, Researcher.

6a Sakhyanova street, Ulan-Ude 670047.

elbaev@ginst.ruБурдуковскийВ. В.BurdukovskyV. V.

Бурдуковский Валерий Васильевич – аспирант.

670047, Улан-Удэ, ул. Сахьяновой, 6а.

Valeriy V. Burdukovsky - Post-Graduate Student.

6a Sakhyanova street, Ulan-Ude 670047.

burdukovskii_valera@mail.ruГеологический институт СО РАН; Бурятский государственный университетРоссияGeological Institute, Siberian Branch of RAS; Buryat State UniversityRussian FederationГеологический институт СО РАНРоссияGeological Institute, Siberian Branch of RASRussian Federation201915092019103779799Copyright © Цыганков А.А., Хубанов В.Б., Бурмакина Г.Н., Елбаев А.Л., Бурдуковский В.В., 20192019Цыганков А.А., Хубанов В.Б., Бурмакина Г.Н., Елбаев А.Л., Бурдуковский В.В.Tsygankov A.A., Khubanov V.B., Burmakina G.N., Elbaev A.L., Burdukovsky V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/904

Позднепалеозойские и раннемезозойские щелочные гранитоиды А-типа (сухие, щелочные, умеренно-глиноземистые, железистые) широко распространены в структурах Центрально-Азиатского складчатого пояса. В Северной Монголии и Забайкалье известны сотни массивов, формировавшихся с конца пермского периода до средней юры включительно. Эти массивы сложены щелочными гранитами, щелочными и щелочно-полевошпатовыми сиенитами и расположены в пределах блоков коры (террейнов) разного возраста и происхождения. Новые геохимические данные, полученные по Кручининскому, Шербахтинскому, Шабартайскому и Хамнейскому массивам, в совокупности с опубликованными ранее (Брянский, Харитоновский плутоны), показывают, что при общем петрогеохимическом сходстве основных разновидностей пород, слагающих эти плутоны, их изотопный состав (Nd) существенно различается. Проведенные исследования дают основание полагать, что изотопный состав гранитоидов Забайкалья А-типа обусловлен, с одной стороны, проницаемостью коры для мантийных магм, а с другой – вещественной гетерогенностью собственно коровых источников магм, варьирующихся от раннедокембрийских кристаллических блоков до «молодых» террейнов островодужного типа.

Late Paleozoic and Early Mesozoic alkaline A-type granitoids (anhydrous, alkaline, moderately aluminous, ferruginous) are widely distributed in the structures of the Central Asian Fold Belt. In Northern Mongolia and Transbaikalia, there are hundreds of massifs that formed from the end of the Permian to the Middle Jurassic inclusive. These massifs are composed of alkaline granites, alkaline and alkali-feldspar syenites, and located within crustal blocks (terranes) of different ages and origins. New geochemical data obtained for the Kruchininsky, Sherbakhtinsky, Shabartay and Khamney massifs, as well as earlier published materials (Bryansk and Kharitonovo plutons), demonstrate that despite the general petrogeochemical similarity of the main rock types composing these plutons, their isotopic composition (Nd) differs significantly. Our studies suggest that the isotopic composition of Transbaikalia A-type granitoids is caused, on the one hand, by the crust permeability for mantle magmas and, on the other hand, by the material heterogeneity of the crustal magma sources themselves, varying from the Early Precambrian crystalline blocks to ‘young’ island-arc terranes.

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