Provenance of Ross Sea Drift in McMurdo Sound (Antarctica) and implications for middle-Quaternary to LGM glacial transport: New evidence from petrographic data

Perotti, Matteo; Zurli, L.; Sandroni, S.; Cornamusini, Gianluca; Talarico, F.

doi:10.1016/j.sedgeo.2018.04.009

Cited by 9 publications

(4 citation statements)

References 51 publications

(82 reference statements)

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“…Therefore, we suggest that where the P1 population is present, a WAIS source can be reasonably excluded. In East Antarctica, except of course the surroundings of the McMurdo Volcanic Province, volcanic clasts have been detected in the Royal Society Range foothills (Perotti et al, 2018), the Dry Valleys (Ehrmann & Polozek, 1999; Kyle, 1981, 1990; Marchant et al, 1996; Sandroni & Talarico, 2006), and, more to the north, along the northern Victoria Land (Müller et al, 1991; Rocchi et al, 2002). Considering the location of sample 9, in which P1 clasts are abundant, we speculate that the youngest grains in this sample are derived from McMurdo Volcanic Group.…”

Section: Discussionmentioning

confidence: 99%

“…Actually, such fission track ages are rare in the Dry Valleys (Fitzgerald et al, 2006;Gleadow & Fitzgerald, 1987) and Granite Harbor region (Fitzgerald, 1992), but they have been detected in the Royal Society Range (Olivetti et al, 2018) and are also abundant to the south, between the Skelton and Byrd Glaciers (Huerta et al, 2011;Zattin et al, 2014) as well as much farther (600 km) to the south (Fitzgerald, 1994;Fitzgerald & Stump, 1997;Miller et al, 2010;Stump & Fitzgerald, 1992). However, apatite fission track data by Perotti et al (2018) also show samples in the ERS (P3, P4, P6, P8, and P9 in Figure 1), possibly derived from West Antarctica, that yield grains with ages from 30 to 40 Ma. A further support to an Oligocene exhumation phase derives by results obtained by thermal modeling, as described in the following section.…”

Section: Identification Of Eais and Wais Sourcesmentioning

confidence: 99%

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Apatite Fission Track Signatures of the Ross Sea Ice Flows During the Last Glacial Maximum

Zattin

Olivetti

2020

Geochem Geophys Geosyst

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The catchment for the Ross Sea ice includes both the East and the West Antarctic ice sheets, but the mass balance is a direct response to climate change. Our work is aimed to reconstruct the ice flows after the Last Glacial Maximum and is based on apatite fission track data from samples collected from 18 piston cores across the Ross Sea embayment. Fission track ages have been divided into meaningful populations and then compared with bedrock ages from West and East Antarctica. Furthermore, fission track lengths have been measured on each population and then compared through forward modeling with thermal histories derived from literature. The widespread presence of apatites with cooling ages of about 30-40 Ma reveals a main exhumation phase of the Transantarctic Mountains during the Oligocene associated to the last phases of the West Antarctic Rift System. Furthermore, the presence of key marker apatites (e.g., younger than 21 Ma or older than 230 Ma) allows to identify the Central High as a major ice flow divide.

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Section: Discussionmentioning

confidence: 99%

Section: Identification Of Eais and Wais Sourcesmentioning

confidence: 99%

Apatite Fission Track Signatures of the Ross Sea Ice Flows During the Last Glacial Maximum

Zattin

Olivetti

2020

Geochem Geophys Geosyst

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“…For each thin section, photomicrographs and a petrographic description were made (see THINSECT in Supplementary material). In addition, seven diamictite bulk samples were taken, dried, and sieved according to methodologies proposed by Perotti et al (2018): the granulometric fraction >2 mm was mounted in epoxy and made into thin sections for petrographic analysis. The analysis aimed to identify grain lithologies present also in the bulk samples in which pebbles and cobbles are rare (see Table S1 in TABLES in Supplementary material).…”

Section: Methodsmentioning

confidence: 99%

Data report: petrology of gravel-sized clasts from Site U1521 core, IODP Expedition 374, Ross Sea West Antarctic Ice Sheet History

Zurli¹,

Perotti²,

Talarico³

2022

Proceedings of the International Ocean Discovery Program

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“…This ice surface reconstruction is interpreted to show that sea-level rise from Meltwater pulse-1a may have initiated thinning at Koetillitz Glacier, but that Koetillitz Glacier was not a source of meltwater (Anderson et al, 2017). Terrestrial radiocarbon studies in Southern Victoria Land do not show melt-water input from the Scott Coast during Meltwater pulse-1a (between ~14.6 kya and ~14.3 kya), but glaciers in the area may respond to rising sea level (Hall and Denton, 2000;Hall et al 2004, Baroni andHall et al, 2015;Jackson et al, 2018;Perotti et al, 2018). Four thinning histories from outlet glaciers in the southern Transantarctic Mountains are interpreted to show that the Ross Sea Sector neither contributed nor responded in a significant manner to the rapid sea-level rise from Meltwater pulse-1a (Spector et al, 2017).…”

Section: Evidence For a Mawson Glacier Contribution To Meltwater Pulse-1amentioning

confidence: 99%

Outlet Glacier and Landscape Evolution of Victoria Land, Antarctica

Whitmore¹

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<p>Terrestrial cosmogenic exposure studies are an established and rapidly evolving tool for landscapes in both polar and non-polar regions. This thesis takes a multifaceted approach to utilizing and enhancing terrestrial cosmogenic methods. The three main components of this work address method development, reconstructing surface-elevation-changes in two large Antarctic outlet glaciers, and evaluating bedrock erosion rates in Victoria Land, Antarctica. Each facet of this work is intended to enhance its respective field, as well as benefit the other sections of this thesis. Quartz purification is a necessary and critical step to producing robust and reproducible results in terrestrial cosmogenic nuclide studies. Previous quartz purification work has centred on relatively coarse sample material (1 mm-500 μm) and is effective down to 125 μm. However, sample material finer than that poses significant purification challenges and this material is usually discarded. The new purification procedure outlined in this thesis shows that very fine sand size material (125-63 μm) can be reliably cleaned for use in terrestrial cosmogenic nuclide studies. The results below show that 35% mass loss in very fine-grained quartz is sufficient to remove major elements (Al, Ti, Na, K, Fe, Mg, Ca, Mn,) and trace elements (9Be, and 10B) along with meteoric 10Be. Insufficient leaching is most detrimental to Al concentration, however errors up to 27% in exposure age and up to 29% in erosion rate are possible if meteoric 10Be is not fully removed from quartz during the HF leaching stages. Outlet glaciers have been well observed since the beginning of the satellite era, approximately 60 years ago. However, we do not currently know how these important glaciers, which drain a significant portion of the Antarctic Ice Sheet, have behaved on centennial to millennial timescales. Dating glacial erratics deposited by a thinning outlet glacier provides a window into the long-term outlet glacier and ice sheet response to climatic forcing. New results in this thesis constrain the thinning history of Mawson and Tucker glaciers over the last several thousand years. Mawson Glacier undergoes rapid thinning from at least ~6.5 kya to ~4.9 kya then transitions to slower thinning until ~1 kya, with a minimum of 250 m of ice-surface-lowering. While Tucker Glacier ~450 km north undergoes gradual thinning from ~19 kya to ~5 kya with ~300 m of ice-surface-lowering. The results of this work show that either the Tucker Glacier was not significantly affected by the Ross Ice Shelf grounding line, or that Antarctic mountain glaciers respond differently to the outlet glaciers connected to the Easty Antarctic Ice Sheet. The style, rate, magnitude, and duration of thinning is unique to each outlet glacier, even with similar climate forcing. The results of this work shed light on the style and duration of outlet glacier thinning and retreat that is possible following a climate perturbation. Antarctica’s average bedrock erosion rate is consistently lower than 4.5 m/Myr, the lowest bedrock erosion rates for any region on Earth. Therefore, many cosmogenic dating studies assume zero erosion when calculating exposure ages. However, previous erosion rate work in Antarctica is biased to arid high-elevation inland sites (~60% of work) and the hyperarid ice-free McMurdo Dry Valleys (~40% of work). These studies do not capture the effects of coastal maritime climates, where many outlet glacier studies are conducted, on the rate of bedrock erosion. New results presented in this thesis show that the Northern Victoria Land coast has the highest known erosion rate in Antarctica. Two sample sites were selected, one coastal and one in the interior. The coastal bedrock erosion rates are 8.86±0.78 m/Myr and 7.15±0.6 m/Myr while the interior bedrock erosion rates are 1.07±0.08 m/Myr and 0.42±0.03 m/Myr. The coastal erosion rates are average for non-polar cold climates while the inland sites are below average for polar erosion rates. The results suggest a strong gradient in the rate of erosion is present from the Antarctic coastline inland. If exposure ages are not calculated with an appropriate erosion rate the apparent age may under-estimate the actual age by as much as 12%, which is thousands of years for Holocene thinning histories like those found in this thesis.</p>

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Provenance of Ross Sea Drift in McMurdo Sound (Antarctica) and implications for middle-Quaternary to LGM glacial transport: New evidence from petrographic data

Cited by 9 publications

References 51 publications

Apatite Fission Track Signatures of the Ross Sea Ice Flows During the Last Glacial Maximum

Apatite Fission Track Signatures of the Ross Sea Ice Flows During the Last Glacial Maximum

Data report: petrology of gravel-sized clasts from Site U1521 core, IODP Expedition 374, Ross Sea West Antarctic Ice Sheet History

Outlet Glacier and Landscape Evolution of Victoria Land, Antarctica

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