Radiocarbon dating of mumiyo from the Vestfold Hills, East Antarctica

Kiernan, K; McConnell, Anne; Lawson, Ewan

doi:10.26749/rstpp.136.141

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…The n-alcohols (FAlc) were LGM and MIS3 polynyas Figure 1. Modern distribution of snow petrel breeding colonies (Croxall et al, 1995;Goldsworthy & Thomson, 2000;Steele & Newton, 1995) and locations of 14 C-dated mumiyo deposits (Hiller et al, 1988;Kiernan et al, 2002;Kiernan et al, 2009;Mackintosh et al, 2011;Melles et al, 1997;Ryan et al, 1992;Steele & Hiller, 1997;Thor & Low, 2011;Verkulich & Hiller, 1994;Wand & Hermichen, 2005). SR = Shackleton Range; PMR = Petermann Range; PCM = Prince Charles Mountains.…”

Section: Methodsmentioning

confidence: 99%

“…The 14 C ages of mumiyo deposits provide age constraints on the timing of deglaciation or inundation of terrestrial sites, since mumiyo deposition at a given time implies subaerial exposure, that is, neither ice or snow coverage nor flooding by lake or ocean (e.g., Kiernan et al, ; Wand & Hermichen, ), and thereby can complement exposure dating of glacial erratics and landforms in Antarctica (Mackintosh et al, ). In currently unglaciated coastal areas of East Antarctica, like Bunger Hills, Vestfold Hills, and Larsemann Hills, as well as from more inland sites in the Prince Charles Mountains and Shackleton Range, mumiyo ages indicate a snow petrel colonization predominantly during the Holocene, following local deglaciation (e.g., Ainley et al, ; Hiller et al, ; Kiernan et al, , ; Mackintosh et al, ; Verkulich & Hiller, ; Figure ). Mumiyo ages of up to 37 thousand years before present (ka) were found in the mountain ranges of western and central Dronning Maud Land (DML), indicating snow petrel occupation and of ice‐free sites during the late Pleistocene (Hiller et al, , ; Steele & Hiller, ; Thor & Low, ; Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…Initial radiocarbon ( 14 C) dating of mumiyo deposits proved the datability of the organic material (e.g., Hiller et al, ). The 14 C ages of mumiyo deposits provide age constraints on the timing of deglaciation or inundation of terrestrial sites, since mumiyo deposition at a given time implies subaerial exposure, that is, neither ice or snow coverage nor flooding by lake or ocean (e.g., Kiernan et al, ; Wand & Hermichen, ), and thereby can complement exposure dating of glacial erratics and landforms in Antarctica (Mackintosh et al, ). In currently unglaciated coastal areas of East Antarctica, like Bunger Hills, Vestfold Hills, and Larsemann Hills, as well as from more inland sites in the Prince Charles Mountains and Shackleton Range, mumiyo ages indicate a snow petrel colonization predominantly during the Holocene, following local deglaciation (e.g., Ainley et al, ; Hiller et al, ; Kiernan et al, , ; Mackintosh et al, ; Verkulich & Hiller, ; Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Mumiyo Deposits From East Antarctica as Archives for the Late Quaternary Environmental and Climatic History

Berg

Melles

Hermichen

et al. 2019

Geochem Geophys Geosyst

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Mumiyo deposits form in the vicinity of snow petrel (Pagodroma nivea) nesting sites and consist of fossil stomach oil (mumiyo), guano, and minerogenic material. Here we evaluate mumiyo deposits from the inland mountain ranges of central Dronning Maud Land as high‐resolution archives for paleoenvironmental reconstructions in Antarctica. Investigation of internal structures and chemical composition shows that the lamination reflects progressive sedimentation, despite the irregular outer morphology of the deposits. Detailed radiocarbon analysis demonstrates that stratigraphies are intact: 14C ages become successively younger upwards in the deposits. Fatty acid and n‐alcohol composition was determined on samples from eight mumiyo deposits. Dominance of low molecular weight compounds (C14 to C18) points to a dietary signal; however, the relatively low proportions of unsaturated compounds compared to fresh stomach oils indicates some postdepositional degradation. We found marine diatoms in the mumiyo, which potentially provide a proxy for sea ice conditions in the foraging habitat of the petrels. Age ranges of the investigated deposits suggest occupation of the analyzed sites by snow petrels from 17 ka to >58 ka. Changes in deposition rates point to higher occupation frequency in Petermann Range from 46 to 42 ka compared to the late marine isotope stage 3 and the Last Glacial Maximum.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Mumiyo Deposits From East Antarctica as Archives for the Late Quaternary Environmental and Climatic History

Berg

Melles

Hermichen

et al. 2019

Geochem Geophys Geosyst

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“…As discussed above, local ice loss can damp the rate of local RSL rise, and hence, conversely, local ice mass gain due to thickening or re-advance has the potential to enhance rates of local RSL rise if the mass gain is sufficient to cause subsidence of the local land surface. However, there is no independent evidence of this in marine geological or lake sediment records ; the only documented advance is the 'Chelnok Advance', a minor lateral expansion of the Sørsdal Glacier which is poorly constrained at no later than 3000-1400 14 C yr BP (Gore, 1997), b2000 14 C yr BP (Gore et al, 1996), or 710 corrected yr BP (Fitzsimons and Domack, 1993;Kiernan et al, 2002). The latter estimate was based on a shell macrofossil age of 2010 ± 60 14 C yr BP which calibrated and corrected for the local marine carbon reservoir (with a nearby modern Laternula shell of 950 ± 110 yr BP; SUA 1235) is 755-1263 cal yr BP.…”

Section: Rapid Sea Level Risesmentioning

confidence: 96%

Rapid early Holocene sea-level rise in Prydz Bay, East Antarctica

Hodgson

Whitehouse

Cort

et al. 2016

Global and Planetary Change

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Prydz Bay is one of the largest embayments on the East Antarctic coast and it is the discharge point for approximately 16% of the East Antarctic Ice Sheet. Geological constraints on the regional ice sheet history include evidence of past relative sea-level change at three sites; the Vestfold Hills, Rauer Islands and Larsemann Hills. In this paper we compile updated regional relative sea-level data from these sites. We compare these with a suite of relative sea-level predictions derived from glacial isostatic adjustment models and discuss the significance of departures between the models and the field evidence. The compiled geological data extend the relative sea-level curve for this region to 11,258 cal yr BP and include new constraints based on abandoned penguin colonies, new isolation basin data in the Vestfold Hills, validation of a submarine relative sea-level constraint in the Rauer Islands and recalibrated radiocarbon ages at all sites dating from 12,728 cal yr BP. The field data show rapid increases in rates of relative sea level rise of 12-48 mm/yr between 10,473 (or 9678) and 9411 cal yr BP in the Vestfold Hills and of 8.8 mm/yr between 8882 and 8563 cal yr BP in the Larsemann Hills. The relative sea-level high stands of >= 8.8 m from 9411 to after 7564 cal yr BP (Vestfold Hills) and >= 8 mat 8563 and 7066 cal yr BP (Larsemann Hills) are over-predicted by some of the glacial isostatic adjustment models considered here, suggesting that assumptions relating to the magnitude and timing of regional ice loss since the Last Glacial Maximum may need revising. In the Vestfold Hills and Rauer Islands the final deglacial sea-level rise was almost exactly cancelled out by local rebound between 9411 and 5967 cal yr BP and this was followed by a near exponential decay in relative sea-level. In the Larsemann Hills the sea-level data suggest that the rate of ice retreat in this region was not uniform throughout the Holocene. Swath bathymetric surveys of the benthic seafloor topography show the presence of multiple offshore basins. These are a priority for further study as those that remained free of grounded ice should provide precise constraints on relative sea-level rise and ice sheet history during the most rapid phases of the last major deglaciation

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“…Modern samples of marine shell and marine algae from Vestfold Hills yielded ages of 950 a BP and 1310 a BP respectively (Adamson & Pickard 1983, 1986 due to 14 C depletion of oceanic waters and the food chain (the marine reservoir effect; Ascough et al 2005). However, a very recent age of only 500 years has been obtained from the base of a mumiyo accumulation 18 cm thick in Vestfold Hills (Kiernan et al 2003), indicating that a robust correction factor for mumiyo requires further investigation. As a consequence, the true age of the mumiyo remains uncertain and radiocarbon years are reported here.…”

Section: Chemistry Of Sediment and Salt Efflorescencesmentioning

confidence: 99%

Deglaciation and weathering of Larsemann Hills, East Antarctica

et al. 2009

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Abstract:In situ cosmogenic 10 Be exposure dating, radiocarbon determinations, salt and sediment geochemistry, and rock weathering observations indicate that parts of Larsemann Hills, East Antarctica have been subaerially exposed throughout much of the last glacial cycle, with the last glaciation occurring prior to 100 ka BP. Salt-enhanced subaerial weathering, coupled with a paucity of glacial erratics, made exposure age dating challenging. Rapid subaerial surface lowering in some places means that some exposure ages may underestimate the true age of deglaciation. Despite this uncertainty, the data are consistent with the absence of overriding by a thick ice sheet during the Last Glacial Maximum ,20-18 ka BP.

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Radiocarbon dating of mumiyo from the Vestfold Hills, East Antarctica

Cited by 3 publications

References 16 publications

Evaluation of Mumiyo Deposits From East Antarctica as Archives for the Late Quaternary Environmental and Climatic History

Evaluation of Mumiyo Deposits From East Antarctica as Archives for the Late Quaternary Environmental and Climatic History

Rapid early Holocene sea-level rise in Prydz Bay, East Antarctica

Deglaciation and weathering of Larsemann Hills, East Antarctica

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