gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-4-0768IGQOLDgtcrust-1880Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSКИБАРСКИЙ ГРАНИТОИДНЫЙ МАГМАТИЗМ РЕСПУБЛИКИ БУРУНДИ: ГЕОЛОГИЯ, ВЕЩЕСТВЕННЫЕ ОСОБЕННОСТИ, ВРЕМЯ И ГЕОДИНАМИЧЕСКИЕ УСЛОВИЯ ПРОЯВЛЕНИЯKIBARAN GRANITOID MAGMATISM IN THE REPUBLIC OF BURUNDI: GEOLOGY, COMPOSITIONAL FEATURES, TIME AND GEODYNAMIC CONDITIONS OF OCCURRENCEНенаховВ. М.NenakhovV. M.

394018, Воронеж, Университетская площадь, 1

1 University Sq, Voronezh 394018

viktor.nenahov@mail.ruБарихутаБ.BarihutaB.

394018, Воронеж, Университетская площадь, 1

1 University Sq, Voronezh 394018

ИльинВ. В.IlinV. V.

394018, Воронеж, Университетская площадь, 1

1 University Sq, Voronezh 394018

Воронежский государственный университетРоссияVoronezh State UniversityRussian Federation202418082024154768768Copyright © Ненахов В.М., Барихута Б., Ильин В.В., 20242024Ненахов В.М., Барихута Б., Ильин В.В.Nenakhov V.M., Barihuta B., Ilin 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/1880

В работе рассмотрен специфичный гранитоидный магматизм северного сектора кибарского орогенного пояса в контексте проблем геодинамической типизации гранитоидов в целом. Приведены параметры и основные черты строения, подчеркнута секториальная природа рассматриваемого пояса, характерная для внутриплитных обстановок, показаны геологические особенности восточного и западного блоков северного сектора. Приводятся общие сведения о гранитоидах, относимых к S- и A-типу и описание геологического положения и макропризнаков «реперных» массивов. Даны петрохимические характеристики S- и A-гранитоидов с использованием различных диаграмм. Анализ всей имеющейся на сегодняшний день базы данных по геохронологии (включая изохронные Rb-Sr по породе и U-Pb SHRIMP по циркону) показывает многоимпульсный характер проявления внутриплитного гранитообразования. Наряду с основными этапами (~1375, ~1205, ~986 млн лет) проявляются еще пять рубежей. На основании всей совокупности данных гранитоиды территории Бурунди, относимые к S-типу, характеризуются признаками корово-мантийного взаимодействия, что не вполне отвечает общепринятой точке зрения о них как о чисто коровых. В то же время для некоторых разновидностей А-типа гранитоидов характерна корундонормативность, что сближает их с S-типом. Таким образом, признаки конвергенции S- и А-гранитов – характерная черта некоторых внутриплитных обстановок типа «горячих точек», прежде всего для долгоживущих и многоимпульсных, при наличии соответствующего протолита, представленного высокодифференцированным в экзогенных условиях комплексом осадков. Один из вариантов модели формирования гранитов представлен на соответствующем рисунке и в комментарии к нему.

The paper examines the specific granitoid magmatism of the northern sector of the Kibaran orogenic belt in the general context of geodynamic typification of granitoids. It presents parameters and main features of the structure with an emphasis on the sectorial nature of the belt typical of intraplate settings and shows the geological features of the eastern and western blocks of the northern sector. The paper provides general information on S- and A-type granitoids and a description of the geological position and macrofeatures of "reference" massifs. The petrochemical characteristics of S- and A-granitoids are given using various diagrams. Analysis of geochronological database available to date (including Rb-Sr isochron age of rocks and SHRIMP U-Pb age of zircons) shows the multi-pulse nature of the manifestation of intraplate granite formation. Along with the main stages (~1375, ~1205, ~986 Ma), there are five others. Based on the total dataset, S-type granitoids in Burundi are characterized by the crust-mantle interaction signs which are somewhat contrary to the generally accepted opinion that they are purely crustal. At the same time, some varieties of A-type granitoids are characterized by corundonormativity which makes them more similar to the S-type. Thus, signs of convergence between S- and A-granites are characteristic of some intraplate environments such as "hot spots", primarily of those longlived and multi-pulse, with the relevant protolith represented by a complex of sediments with high exogenous differentiation. One of the version of the granite formation model is illustrated by the corresponding figure.

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