Structure and evolution of the Davis and Obruchev Archaean Terranes based on the first comprehensive isotopic-geochronological studies of the Denman Glacier region (East Antarctica)
- Авторлар: Maslov V.А.1, Kaminsky V.D.1, Vodovozov V.Y.2, Vorobiev D.M.1
-
Мекемелер:
- Федеральное государственное бюджетное учреждение " Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени академика И.С.Грамберга"
- Federal State Budgetary Scientific Institution Geological Institute of the Russian Academy of Sciences (GIN RAS)
- Шығарылым: Том 526, № 1 (2026)
- Бөлім: GEOLOGY
- ##submission.dateSubmitted##: 30.04.2025
- ##submission.dateAccepted##: 22.09.2025
- ##submission.datePublished##: 16.10.2025
- URL: https://journals.rcsi.science/2686-7397/article/view/289994
- ID: 289994
Дәйексөз келтіру
Толық мәтін
Аннотация
The research inaccessible region of Denman Glacier revealed the presence of Paleoarchean and Neoarchean blocks comparable to other protocratons of East Antarctica and the Earth as a whole, which is particularly relevant in the context of Archean geodynamic issues and determine the evolutionary stages of continental crust in Archean terranes.
The results of U–Pb isotope-geochronological dating of a wide range of rocks from two Archean domains and tectonically framing fragments of mobile belts are presented. The Paleoarchean age (3276.6 ± 29 Ma) of tonalitic orthogneisses in the Davis Terrane, compositionally similar to TTG associations, has been confirmed. For the first time, sillimanite-garnet paragneisses were identified within the terrane, with the maximum sedimentation age of their protolith dated to 3166 ± 21 Ma. Rifting and relative crustal subsidence between 2960 and 2800 Ma are supported by amphibolite-facies metamorphism in newly formed zircon rims of gneisses and crystalline schists, dated to 2956 ± 21 Ma and 2870 ± 21 Ma, respectively.
The consolidation of the Davis Protocraton occurred at the Mesoarchean-Neoarchean boundary, with the final stage of formation reflected in Pan-African tectono-thermal processes between 545 and 487 Ma.
The early stage of the Neoarchean Obruchev Terrane formation, first recorded in the Cape Jones, is associated with the crystallization of orthogneiss protoliths 2711 ± 8.9 Ma ago. Tectono-thermal events of the accretionary-collisional regime are constrained to the interval of 1190–1150 Ma, corresponding to the development of the Wilkes Mobile Belt, which correlates with the Albany-Fraser Orogeny in Australia.
The Davis and Obruchev Terranes represent ancient granite-gneiss protocratons that evolved independently during the Archean-Mesoproterozoic geodynamic stage. The amalgamation of the Davis and Obruchev Archean domains into a single collage is linked to the final stage of the Rayner Orogeny and the incorporation of Antarctica into the Rodinia supercontinent 1150–900 Ma ago.
Толық мәтін

Авторлар туралы
Vsevolod Maslov
Федеральное государственное бюджетное учреждение " Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени академика И.С.Грамберга"
Хат алмасуға жауапты Автор.
Email: massev@gmail.com
кандидат геолого-минералогических наук
РесейValery Kaminsky
Федеральное государственное бюджетное учреждение " Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени академика И.С.Грамберга"
Email: okeangeo@vniio.ru
Академик РАН, Научный консультант
Vladimir Vodovozov
Federal State Budgetary Scientific Institution Geological Institute of the Russian Academy of Sciences (GIN RAS)
Email: vodo7474@yandex.ru
119017, Moscow, Pyzhevsky per., 7, building
Dmitry Vorobiev
Федеральное государственное бюджетное учреждение " Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени академика И.С.Грамберга"
Email: dmi7720@yandex.ru
Әдебиет тізімі
- Н. Л. Алексеев, И. А. Каменев, Е. В. Михальский, Ларионов А. Н., Капитонов И. Н., Богомолов Е.С., Егоров М. С. Полистадийная эволюция протерозойской коры Восточной Антарктиды на примере террейна Филла (острова Рёуер): новые геологические и изотопные данные // Геология и геофизика. 2021. Т. 62. № 5. С .690-710.
- Грикуров Г.Э., Лейченков Г.Л., Михальский Е.В. Тектоническая эволюция Антарктики в свете современного состояния геодинамических идей // Сб.: Строение и история развития литосферы. Сер. "Вклад России в Международный полярный год 2007/08". 2010. Москва-Санкт-Петербург. С. 89-108.
- Михальский Е.В. Основные этапы и геодинамические режимы формирования земной коры Восточной Антарктиды в протерозое – раннем палеозое // Геотектоника. 2008. № 6. С. 3–25
- Alexeev N.L., Zinger T.F., Kapitonov I.N. Age of charnokitic magmatism from the Obruchev hills, Banger-Denman area (East Antarctica) // Doklady Earth Sciences. 2011. Т. 440. № 1. С. 1233-1238.
- Black L.P, Sheraton J.W., Tingey R.J., McCulloch M.T. New U–Pb zircon ages from the Denman Glacier area, East Antarctica, and their significance for Gondwana reconstruction //Antarctic Science. 1992. № 4. P. 447–460.
- Daczko N.R., Halpin J.A., Fitzsimons I.C.W., Whitta-ker J.M. A cryptic Gondwana-forming orogen located in Antarctica // Scientific Reports. 2018. №8: 8371.
- Fitzsimons I.C.W. Proterozoic basement provinces of southern and south-western Australia, and their correlation with Antarctica. ‒ In: Proterozoic East Gondwana:Super-Continent Assembly and Breakup. ‒ Ed.by M. Yoshida, B.F. Windley, S. Dasgupta S, (Spec.Publ. Geol. Soc., London, 2003), P. 93–13
- Maslov V.A., Kaminsky V.D., Rodionov N.V., Vorobiev D.M. New Data on the Geological Structure and Precambrian Evolution of the Mountain Framework of the Denman Glacier Western Side (East Antarctica): First Paleoarchean Age for Plagiogneisses. // Doklady Earth Sciences, 2023, Vol. 512, Part 2, pp. 923–937
- Pearce J.A., Harris N.B., and Tindle A.G. Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks // J. Petrology. 1984. No. 5. P. 956–983.
- Sheraton J.W., Tingey R.J., Oliver R.L., Black L.P. Geology of the Bunger Hills–Denman Glacier region, East Antarctica // Australian Geological Survey Organisation Bulletin. 1995. V. 244. 124 p.
- Sheraton J.W., Tingey R.J., Black L.P., Oliver R.L. Geology of the Bunger Hills area, Antarctica: implications for Gondwana correlations // Antarct. Sci. 1993. № 5. 85–102 p.
- Tucker N.M., Hand M., Clark C. The Bunger Hills: 60 years of geological and geophysical research // Antarctic Science. 2020. № 32 (2). P. 85–106.
Қосымша файлдар
