gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-2-0747ZOUBVTgtcrust-1817Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSГЕОХИМИЧЕСКИЕ ХАРАКТЕРИСТИКИ БАЗИТОВ В СТРУКТУРЕ ЕНИСЕЙ-ХАТАНГСКОГО ПРОГИБА И ИХ ПРИНАДЛЕЖНОСТЬ К СИБИРСКОЙ ТРАППОВОЙ ПРОВИНЦИИGEOCHEMICAL CHARACTERISTICS OF MAFIC ROCKS IN THE STRUCTURE OF THE YENISEI-KHATANGA TROUGH AND THEIR BELONGING TO THE SIBERIAN TRAP PROVINCEПолянскийО. П.PolyanskyO. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

pol@igm.nsc.ruФилипповЮ. Ф.FilippovYu. F.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090

1 Pirogov St, Novosibirsk 630090

СелятицкийА. Ю.SelyatitskiiA. Y.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПолянскийП. О.PolyanskyP. O.

630090, Новосибирск, пр-т Академика Коптюга, 3

 

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН ; Новосибирский государственный университетРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences ; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН ; Алтае‐Саянский филиал ФИЦ ЕГС РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences ; Altai-Sayan Branch of the Federal Research Center of the Geophysical Survey, Russian Academy of SciencesRussian Federation202419042024152747747Copyright © Полянский О.П., Филиппов Ю.Ф., Селятицкий А.Ю., Полянский П.О., 20242024Полянский О.П., Филиппов Ю.Ф., Селятицкий А.Ю., Полянский П.О.Polyansky O.P., Filippov Y.F., Selyatitskii A.Y., Polyansky P.O.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/1817

Охарактеризован геохимический состав пород, представляющих скрытую часть вулканогенного и интрузивного материала в структуре Енисей-Хатангского прогиба (ЕХП), в отношении его принадлежности к Сибирской крупной магматической провинции (КМП). Геохимические характеристики базитов, присутствующих в осадочных комплексах ЕХП, соответствуют трем типам базитов, выделяемых в Сибирской КМП: низкотитанистым надеждинского типа, низкотитанистым моронговского типа и в ограниченном количестве – высокотитанистым ивакинского типа «рифтового» этапа, выделяемого для Сибирской КМП. На основании сейсмических данных построена глубинная структурно-тектоническая модель в поперечном сечении и рассмотрено положение базитовых интрузий в осадочном разрезе в западной зоне сочленения Сибирской платформы и Карского (Таймыр-Североземельского) орогена. По сейсмическим данным фиксируется аномальная область в нижней коре и на границе кора – мантия непосредственно под депоцентром ЕХП, которая на сейсмическом разрезе характеризуется «рассеянной» хаотичной волновой картиной с отсутствием отражающих границ.

Consideration is being given to the geochemical composition of the rocks, representing the hidden part of the volcanic and intrusive material in the structure of the Yenisei-Khatanga Trough (YKT), in relation to its belonging to a large igneous province (LIP) of Siberia. The geochemical characteristics of mafic rocks, presenting in the sedimentary complexes of the YKT, correspond to three types of mafic rocks allocated to the Siberian LIP: Nadezhdinsky (low Ti), Morongovsky (low Ti), and, in limited quantities, Ivakinsky (rift-related high Ti). Based on the seismic data, there was constructed a deep structural-tectonic cross-sectional model, and there was considered the position of mafic intrusions in the sedimentary section in the western junction zone of the Siberian Platform and the Kara (Taimyr-Severozemelsky) orogen. The seismic data show an anomalous area in the lower crust and at the crust–mantle boundary immediately below the YKT depocenter, whose seismic section is characterized by a chaotic scattered wave field with no reflective boundaries.

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