Fig. 1: Geological setting of the study area.
From: An embayment in the East Antarctic basement constrains the shape of the Rodinian continental margin
a Study area (red box) in its Antarctic context. The Mawson Continent includes the >1700 Ma Mawson Craton (MC) and ~1500–1140 Ma continuations of the Australian Coompana Province and Albany-Fraser Orogen (CAF). Note alternative models for the Mawson Continent, either extending from Terre Adélie (TA) to the Shackleton Range (SR)2 grey, or being truncated close to the Central Transantarctic Mountains (CTAM)5,7 blue. The edge of the Mawson Continent is identified in Wilkes Land (WL) and interpreted to follow the Mirny Fault (MF)7. The East African Antarctic Orogeny (EAAO) shown in green in Dronning Maud Land (DML) places an additional limit on the extent of the Mawson Continent8. b Study area with geology and subglacial topography48. Note unexposed Nimrod Igneous Province (NP), and exposed but reworked Archean and Paleoproterozoic province in the CTAM20,25. Key glaciers dissecting the Transantarctic Mountains are named. Ross-age structural trends from mapped exposures49,50,51. Additional abbreviations from north to south are: Recovery Glacier (RG), Weddell Sea Rift System (WSRS), Argentina Range (AR), Pensacola Mountains (PCM), Recovery Subglacial Highlands (RSH), Pensacola-Pole Basin (PPB), Patuxtent Mountains (Ptx), Gamburtsev Subglacial Mountains (GSM), Ohio Range (OR) and Queen Maud Terrane (QMT) (black arrow)15,16.
