In the course of seasonal work of the 70th Russian Antarctic expedition (RAE) in 2024-2025, as part of the field geological and geophysical studies by researchers of Empress Catherine II Saint Petersburg Mining University on the Broknes Peninsula (Larsemann Hills, East Antarctica), areal ground magnetic survey was accomplished at 1:10,000 scale. The study area is characterized by a high exposure degree of Cambrian and Precambrian rocks with localization in certain parts of magnetite-bearing complexes. The work included experimental and methodological research, surveying in two modes (discrete and continuous) with data quality control as well as subsequent processing and initial interpretation of the results. A detailed map of the total magnetic intensity covering an area of 17.5 km2 and maps of the field transformations – vertical derivative, absolute horizontal gradient, etc., were compiled. Qualitative interpretation allowed identifying morphologically homogeneous zones in the study area characterized by different features of anomalous magnetic field. Results of the studies will be used in future for geological interpretation of anomalies and compilation of the structural tectonic map of the region.

This paper presents new data on various types of pegmatites from the Larsemann Hills oasis (Princess Elizabeth Land, East Antarctica), collected during the 70th Russian Antarctic Expedition in 2024-2025. As a result of comprehensive geological and geophysical investigations, all pegmatite occurrences in the area belonging to different stages of the Pan-African orogeny have been described, analyzed, and systematically classified in a unified context for the first time. In addition to previously known pegmatites associated with deformation stages D2-3, D4, and post-D4, a further subdivision is proposed based on mineralogical-geochemical characteristics and the content of natural radionuclides. These include borosilicate D2-3 pegmatites, rare-metal D4 pegmatites, muscovite-bearing post-D4 pegmatites, as well as two newly identified types not previously described in the region: K-feldspar D4' pegmatites and miarolitic rare-metal post-D4' pegmatites, which differ in morphology, mineralogy, and geochemical features. Special attention is given to the structural-tectonic control of pegmatite bodies, their geological setting, zoning patterns, and the results of gamma spectrometric and magnetic surveys. Pegmatitic formations containing rare typomorphic minerals – such as tourmaline, boralsilite, grandidierite, and chrysoberyl – are also examined. The results indicate a significant diversity of pegmatite formation conditions, help refine the PT parameters and timing of the initial and final stages of the Pan-African metamorphic event, and confirm the genetic link between pegmatite development and D2-D4 deformation stages. These findings contribute to the reconstruction of Early Paleozoic pegmatite-forming stages during anatectic processes in the geodynamic evolution of East Antarctica and Gondwana.