Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 94583 10.2205/2025ES001016 sumaba ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Locating the Cambrian Suture in Wilkes Land, East Antarctica, Based on Russian Geophysical Data Locating the Cambrian Suture in Wilkes Land, East Antarctica, Based on Russian Geophysical Data https://orcid.org/0000-0003-2546-4082 Голынский Александр Владимирович Golynskiy Alexander Vladimirovich a.golynsky@gmail.com https://orcid.org/0000-0001-8717-0894 Голынский Дмитрий Александрович Golynsky Dmitry A. https://orcid.org/0000-0003-1711-5632 Киселев Александр Викторович Kiselev Alexander Viktorovich av-kiselevspb@yandex.ru Сахаров Андрей Александрович Sakharov Andrei Alexandorich a.saharov@vniio.ru Егоров Михаил Сергеевич Egorov Mikhail Sergeevicv Гонжуров Николай Александрович Gonzhurov Nikolai Alexandorich Всероссийский научно-исследовательский институт геологии и минеральных ресурсов мирового океана им. акад. И.С. Грамберга Санкт-Петербург Россия All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia) St. Petersburg Russian Federation Всероссийский научно-исследовательский институт геологии и минеральных ресурсов мирового океана им. акад. И.С. Грамберга Россия All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia) Russian Federation Полярная Морская Геологоразведочная Экспедиция Россия Polar Marine Geosurvey Expedition Russian Federation Всероссийский научно-исследовательский институт геологии и минеральных ресурсов мирового океана им. акад. И.С. Грамберга Россия All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia) Russian Federation Всероссийский научно-исследовательский институт геологии и минеральных ресурсов мирового океана им. акад. И.С. Грамберга Россия All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia) Russian Federation Всероссийский научно-исследовательский институт геологии и минеральных ресурсов мирового океана им. акад. И.С. Грамберга Россия All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia) Russian Federation 23 10 2025 23 10 2025 25 5 ES5016 03 02 2025 29 04 2025 https://rjes.ru/en/nauka/article/94583/view

Interpretation of modern aeromagnetic and radar data, primarily from Russian surveys in East Antarctica between 88°–102°E, has resulted in a tectonic map of Precambrian provinces, including two protocratonic domains and two orogens of different ages. The crust of the Charcot Province is presumably composed of Mesoarchean tonalite-gneisses of Cape Charcot (3003 ± 8 Ma), which underwent metamorphism at ~2890 Ma and a zircon-forming episode at ~550 Ma. The West Mawson protocraton province is identified based on magnetic data and is represented by terranes that may have accreted to the western edge of the East Mawson craton in the Mesoproterozoic. The Wilkes Orogen correlates with metamorphic and intrusive rocks of the Bunger Hills, Highjump Archipelago, Obruchev Hills, and exposures in the lower reaches of the Denman Glacier, mostly associated with positive magnetic anomalies forming an elongated, segmented magnetic belt. The Rayner Orogen has a heterogeneous geological structure and can be subdivided into several tectonic zones with specific lithological compositions and slightly different geological histories. All previously proposed fault locations (sutures) between Indo-Antarctica and Australo-Antarctica are not reflected in either modern aeromagnetic data or bedrock topography. Most likely, it is located along the boundary between the Charcot craton and the Wilkes Orogen and corresponds to the Northcliffe Glacier. ADMAP-2 data allow tracing its continuation towards the southern Prince Charles Mountains and/or the subglacial Gamburtsev Mountains.

Interpretation of modern aeromagnetic and radar data, primarily from Russian surveys in East Antarctica between 88°–102°E, has resulted in a tectonic map of Precambrian provinces, including two protocratonic domains and two orogens of different ages. The crust of the Charcot Province is presumably composed of Mesoarchean tonalite-gneisses of Cape Charcot (3003 ± 8 Ma), which underwent metamorphism at ~2890 Ma and a zircon-forming episode at ~550 Ma. The West Mawson protocraton province is identified based on magnetic data and is represented by terranes that may have accreted to the western edge of the East Mawson craton in the Mesoproterozoic. The Wilkes Orogen correlates with metamorphic and intrusive rocks of the Bunger Hills, Highjump Archipelago, Obruchev Hills, and exposures in the lower reaches of the Denman Glacier, mostly associated with positive magnetic anomalies forming an elongated, segmented magnetic belt. The Rayner Orogen has a heterogeneous geological structure and can be subdivided into several tectonic zones with specific lithological compositions and slightly different geological histories. All previously proposed fault locations (sutures) between Indo-Antarctica and Australo-Antarctica are not reflected in either modern aeromagnetic data or bedrock topography. Most likely, it is located along the boundary between the Charcot craton and the Wilkes Orogen and corresponds to the Northcliffe Glacier. ADMAP-2 data allow tracing its continuation towards the southern Prince Charles Mountains and/or the subglacial Gamburtsev Mountains.

 magnetic anomalies radar data magnetic properties craton province fault Kuunga suture magnetic anomalies radar data magnetic properties craton province fault Kuunga suture The work was carried out under the State Assignment No. 049-00005-25-00 of the Federal Agency for Subsoil Use for 2024. We acknowledge the reviewers' comments, which contributed to improving the article's quality The work was carried out under the State Assignment No. 049-00005-25-00 of the Federal Agency for Subsoil Use for 2024. We acknowledge the reviewers' comments, which contributed to improving the article's quality

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