Geomorphology of marine and glacio-lacustrine terraces and raised shorelines in the northern sector of Península Brunswick, Patagonia, Straits of Magellan, Chile

Abstract

This paper illustrates a detailed geomorphological map (scale 1:50,000) of the marine and transitional terraces (glacio-lacustrine to marine) and raised shorelines linked to Holocene glacio-eustasy and neo-tectonics in the northern area of the Brunswick Penìnsula (Chilean region of the Strait of Magellan). The mapped area is located in Tierra del Fuego between the Segunda Angostura and Seno Otway. This map is the result of geomorphological field survey data integrated with the interpretation of aerial photographs and remote sensing imagery. The survey has allowed the mapping of a sequence of terraces and raised shorelines to be completed. The sequence mainly consists of four orders of marine and glacio-lacustrine terraced deposits, with elevations ranging from 25 to 1 m above mean sea level. The map also presents other landforms and deposits, with their formation linked to littoral, fluvial, glacial and aeolian processes. ARTICLE HISTORY

Environmental and coastline changes controlling Holocene carbon accumulation rates in fjords of the western Strait of Magellan region

“…isostatic movements. Moreover, in tectonically active region like the Strait of Magellan, vertical movement in the order of several meters, could also have added to the eustatic and isostatic effects (Bentley and McCulloch, 2005;Breuer et al, 2013b;De Muro et al, 2018). Although the referenced studies provide some elements of the evolution of the coastline in the western Magellan fjord system and formation of terraces since the LGM, their influence on the aquatic environments in terms of development of e.g.…”

An integrated sea-land approach for analyzing forms, processes, deposits and the evolution of the urban coastal belt of Cagliari

“…AA., 2009) and (3) the Geomorphological Map of the Italian Coast (Chelli et al, 2018;Mastronuzzi et al, 2017); also integrated with recent maps on a detailed scale (e.g. Buosi et al, 2019;De Muro et al, 2016;De Muro, Tecchiato, Porta, Buosi, & Ibba, 2018).…”

The evolution of the Patagonian Ice Sheet from 35 ka to the Present Day (PATICE)

“…In Patagonia, the pioneering work of Caldenius (1932), Clapperton (1995), Mercer (1965Mercer ( , 1968Mercer ( , 1970Mercer ( , 1976, Denton et al (1999), Andersen et al (1999), McCulloch andBentley (1998) and McCulloch et al (2005b) laid the foundations for subsequent compilation and mapping of glacial geomorphology by . Our compilation builds on the Glasser and Jansson ( 2008) "Glacial Map of South America" with updates from around the former PIS (e.g., Ackert et al, 2008;Bendle et al, 2017b;Coronato et al, 2009;Darvill et al, 2014Darvill et al, , 2015aDe Muro et al, 2018;…”

“…8), all deposited into former ice-dammed lakes. These were common along the shores of the lakes located east of the contemporary icefields (Bell, 2008(Bell, , 2009Bendle et al, 2017b;Davies et al, 2018;De Muro et al, 2018;Glasser et al, 2016b;Hein et al, 2010;Thorndycraft et al, 2019a;Turner et al, 2005). Marine terraces, documenting former sea level high stands following the LGM, have also been mapped in southern Patagonia especially (e.g.…”

“…This terrace documents a transition from glacio-fluvial-lacustrine conditions to littoral-marine environments. Three lower terraces (at 6 -11 m asl, 3 -5 m asl, and 1 -2 m asl respectively) consist of sedimentary sequences of coastal marine origin, documenting sea level fall during the Holocene (De Muro et al, 2018).…”