Geomorphic and shallow-acoustic investigation of an Antarctic Peninsula fjord system using high-resolution ROV and shipboard geophysical observations: Ice dynamics and behaviour since the Last Glacial Maximum ...

• Main Authors: Garcia, M, Dowdeswell, JA, Noormets, R, Hogan, KA, Evans, J, Ó Cofaigh, C, Larter, RD
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2016
• Subjects: Antarctic Peninsula; fjord systems; last glacial maximum; glacial sedimentary processes; geomorphology; ROV-derived bathymetry; Antarctic; Bourgeois; Bourgeois Fjord; Long Fjord; Marguerite; Marguerite Bay; Antarc*; Ice Sheet; Tidewater
• Online Access: https://dx.doi.org/10.17863/cam.7159; https://www.repository.cam.ac.uk/handle/1810/261921

Detailed bathymetric and sub-bottom acoustic observations in Bourgeois Fjord (Marguerite Bay, Antarctic Peninsula) provide evidence on sedimentary processes and glacier dynamics during the last glacial cycle. Submarine landforms observed in the 50 km-long fjord, from the margins of modern tidewater glaciers to the now ice-distal Marguerite Bay, are described and interpreted. The landforms are grouped into four morpho-sedimentary systems: (i) glacial advance and full-glacial; (ii) subglacial and ice-marginal meltwater; (iii) glacial retreat and neoglaciation; and (iv) Holocene mass-wasting. These morpho-sedimentary systems have been integrated with morphological studies of the Marguerite Bay continental shelf and analysed in terms of the specific sedimentary processes and/or stages of the glacial cycle. They demonstrate the action of an ice-sheet outlet glacier that produced drumlins and crag-and-tail features in the main and outer fjord. Meltwater processes eroded bedrock channels and ponds infilled by ...