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Durham Research Online Durham Research Online Deposited in DRO: 30 July 2019 Version of attached le: Published Version Peer-review status of attached le: Peer-reviewed Citation for published item: Sutherland, Jenna L. and Carrivick, Jonathan L. and Evans, David J.A. and Shulmeister, James and Quincey, Duncan J. (2019) 'The Tekapo Glacier, New Zealand, during the Last Glacial Maximum : an active temperate glacier inuenced by intermittent surge activity.', Geomorphology., 343 . pp. 183-210. Further information on publisher's website: https://doi.org/10.1016/j.geomorph.2019.07.008 Publisher's copyright statement: c 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license. 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Durham University Library, Stockton Road, Durham DH1 3LY, United Kingdom Tel : +44 (0)191 334 3042 | Fax : +44 (0)191 334 2971 https://dro.dur.ac.uk Geomorphology 343 (2019) 183–210 Contents lists available at ScienceDirect Geomorphology journal homepage: www.elsevier.com/locate/geomorph The Tekapo Glacier, New Zealand, during the Last Glacial Maximum: An active temperate glacier influenced by intermittent surge activity Jenna L. Sutherland a,⁎, Jonathan L. Carrivick a, David J.A. Evans b,JamesShulmeisterc,d, Duncan J. Quincey a a School of Geography, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire LS2 9JT, UK b Department of Geography, Durham University, South Road, Durham DH1 3LE, UK c School of Earth and Environmental Sciences, University of Queensland, St Lucia 4072, Queensland, Australia d School of Earth and Environment, University of Canterbury, Private Bag 4800, Christchurch, New Zealand 1 article info abstract Article history: Quaternary glaciations have created impressive landform assemblages that can be used to understand palaeo- Received 22 May 2019 glacier extent, character and behaviour, and hence past global and local glacier forcings. However, in the southern Received in revised form 16 July 2019 hemisphere and especially in New Zealand, the Quaternary glacial landform record is relatively poorly investi- Accepted 16 July 2019 gated with regard to glaciological properties. In this study, a 1 m digital elevation model (DEM) was generated Available online 21 July 2019 from airborne LiDAR data and supplemented with aerial imagery and field observations to analyse the exception- ally well-preserved glacial geomorphology surrounding Lake Tekapo, New Zealand. We describe a rich suite of Keywords: fl Glacial geomorphology Last Glacial Maximum (LGM) and recessional ice-marginal, subglacial, supraglacial, glacio uvial and New Zealand glaciolacustrine landform assemblages. These represent two landsystems comprising i) fluted till surfaces with Lake Tekapo low-relief push moraine ridges; and ii) crevasse-squeeze ridges, ‘zig-zag’ eskers and attenuated lineations. The Airborne LiDAR former landsystem records the behaviour of an active temperate glacier and the latter landsystem, which is Landsystem superimposed upon and inset within the former, strongly suggests intermittent surge phases. The two Active temperate glacier landsystem/landform landsystem signatures indicate a sequential change in ice-marginal dynamics during recession that was likely assemblage to have been partially non-climatically driven. Overall, we present the first evidence of surge-type glacier behav- Surge-type glacier landsystem/landform iour in New Zealand. assemblage © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/). 1. Introduction Patagonian (Benn and Clapperton, 2000; Glasser and Jansson, 2005; Glasser et al., 2008; Darvill et al., 2017; Ponce et al., 2019), and the Glacial landforms are a fundamental source of information regarding British-Irish ice sheets (Evans et al., 2009a; Greenwood and Clark, the extent, character and behaviour offormerglaciers.Theycanprovide 2009a, 2009b; Hughes et al., 2010, 2014; Clark et al., 2012, 2018a), as a valuable record of palaeoglaciological characteristics including the spa- well as smaller ice masses such as mountain and plateau icefields and tial and temporal evolution of ice flow configurations, meltwater drainage their outlets (e.g. Evans et al., 2002; Rea and Evans, 2003; Bickerdike patterns, basal thermal regimes, internal dynamics and ice-marginal re- et al., 2016, 2018a, 2018b and references therein), and the northern and cession (e.g. Dyke and Prest, 1987; Boulton and Clark, 1990a, 1990b; southern forelands of the European Alps (Reuther et al., 2011; Kleman and Borgström, 1996; Clark, 1997; Kleman et al., 1997, 2006; Ellwanger et al., 2011; Reitner et al., 2016; Monegato et al., 2017). Svendsen et al., 2004; Stokes et al., 2012, 2015; Storrar et al., 2014a, Such palaeo-glacier reconstructions are often used as the basis for 2014b; Newton and Huuse, 2017; Patton et al., 2017; Margold et al., understanding global and local forcings on glaciers and hence past cli- 2018). More specifically, the application of modern analogue glacial mate. The propensity of these climate-focused studies in the northern landsystems models (cf. Evans, 2003, 2013 and references therein) has fa- hemisphere contrasts with the relatively poor coverage and resolution cilitated detailed reconstructions of the former ice dynamics of the of studies of palaeo-glacier dynamics in the southern hemisphere. Stud- Laurentide (Dyke and Prest, 1987; Evans et al., 1999, 2008, 2014; Clark ies in Patagonia on glacier dynamics inferred from the glacial geomor- et al., 2000; Dyke et al., 2002; Stokes et al., 2012), Innuitian (England, phological record, have been limited to a few selected sites (e.g. Lovell 1999; Ó Cofaigh et al., 2000; England et al., 2006), Fennoscandian et al., 2012). Such studies across the Southern Alps of New Zealand in- (Sollid et al., 1973; Kleman et al., 1997; Winsborrow et al., 2010), clude Porter (1975), Suggate (1990),andBacon et al. (2001).Thescar- city of this research is perhaps surprising given the identification within individual valleys of extensive and repeated glaciations of the Southern ⁎ Corresponding author. E-mail address: [email protected] (J.L. Sutherland). Alps throughout the Quaternary (Gage and Suggate, 1958; Speight, 1 New address. 1963; Gage, 1985; Clapperton, 1990; Suggate, 1990; Pillans, 1991; https://doi.org/10.1016/j.geomorph.2019.07.008 0169-555X/© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). 184 J.L. Sutherland et al. / Geomorphology 343 (2019) 183–210 Newnham et al., 1999; Barrell, 2011; Barrell et al., 2011; Shulmeister will facilitate targeted efficient field campaigns and a better under- et al., 2019) that left an exceptionally well-preserved set of landforms standing of past glacier-climate interactions in the Southern Alps. and sediments (e.g. Hart, 1996; Mager and Fitzsimons, 2007; Shulmeister et al., 2009; Evans et al., 2010c, 2013; Barrell et al., 2011; 2. Study site and geomorphological setting Putnam et al., 2013a, 2013b; Cook et al., 2014; Borsellino et al., 2017; Sutherland et al., 2019). However, recent work has also considered the Relatively well-studied glacier forelands on South Island, New Southern Alps glaciations regionally and numerical modelling of ice ex- Zealand, cluster in the upper Mackenzie basin (Fig. 1a) and include tent driven by a palaeo-climate has been compared to the landform re- the LGM/Late Glacial landform studies in the Pukaki Valley (Speight, cord (e.g. Golledge et al., 2012; Doughty et al., 2015). In a contrasting 1963; Hart, 1996; Schaefer et al., 2006, 2015; Mager and Fitzsimons, workflow, James et al. (2019) have recently refined the regional land- 2007; Putnam et al., 2010a, 2010b; Evans et al., 2013; Barrell, 2014; form record and used it to generate glaciological reconstructions of ice Barrell and Read, 2014; Kelley et al., 2014; Doughty et al., 2015)and across the Southern Alps during the LGM. those around Lake Oahu (Putnam et al., 2013b; Webb, 2009). These The majority of palaeo-glaciological research in New Zealand has fo- studies have collectively shown that glacial retreat since the Last Glacial cused on constraining the timing of glacial fluctuations (e.g. Suggate, Maximum (LGM; 26.5–19 ka; P.U. Clark et al., 2009) was complex, and 1990; Preusser et al., 2005; Shulmeister et al., 2005, 2010a, 2010b, chronological investigations indicate that rapid and sustained glacier re- 2018; Suggate and Almond, 2005; Schaefer et al., 2009; Kaplan et al., cession began c. 18 ka and that subsequently, the glaciers lost up to 40% 2010, 2013; Putnam et al., 2010a, 2010b; Putnam et al., 2013a, 2013b; of their length within no more than c. 1000 yrs. (Putnam et al., 2013b; Kelley et al., 2014; Doughty et al., 2015; Rother et al., 2015; Koffman Schaefer et al., 2015). The other large valley in the upper Mackenzie et al., 2017; Thackray et al., 2017; Barrell et al., 2019). Much less atten- basin is that containing Lake Tekapo (Fig. 1), which, in contrast, has re- tion has been given to landform identification or to the detailed nature ceived very little attention regarding its glacial geomorphology. The aim of landform-sediment assemblages (Hedding et al., 2018). However, of this study is therefore to present in detail the glacial geomorphology palaeo-climatic reconstructions rely, crucially, on accurate landform of the Tekapo Valley in order to characterize the nature and behaviour of identification and interpretation in terms of process-form regimes be- its former outlet glacier throughout the LGM and during the subsequent fore dating programmes are initiated.
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