Derived constituents in the glacial sediments of the Vestfold Hills, East Antarctica

Gore, Damian B.; Colhoun, Eric A.; Bell, Ken

doi:10.1016/0277-3791(94)90033-7

Cited by 13 publications

(8 citation statements)

References 12 publications

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“…Occasional conspicuous erratics of unknown provenance were found across the Hills, including a distinctive banded iron stone and an omphacite-bearing gneiss, that testify to the longdistance (> 20 km) transport of some clasts. However, the geochemical data show that the bulk of the sediment at Vestfold Hills has been derived locally, consistent with observations of marine fossils and weathered clasts in the glacial sediment (Gore et al 1994). Consideration of these results and the spatial patterns of bedrock chemistry, allowed us to conclude that the sediment transport halfdistance was less than 5 km but greater than 0.1 km.…”

Section: Discussionsupporting

confidence: 82%

“…In addition, marine fossils and weathered clasts (i.e. those exhibiting weathering rinds or tafoni) occur in 62% of all glacial sediments in Vestfold Hills, and such sediments were most abundant in the western parts of the Hills (Gore et al 1994). Since the marine fossils lay within some kilometres down-ice of the marine fjords, Gore et al (1994) concluded that the glacial debris was deposited within a short distance (< 10 km) of the source.…”

Section: Sediment Samplingmentioning

confidence: 99%

“…those exhibiting weathering rinds or tafoni) occur in 62% of all glacial sediments in Vestfold Hills, and such sediments were most abundant in the western parts of the Hills (Gore et al 1994). Since the marine fossils lay within some kilometres down-ice of the marine fjords, Gore et al (1994) concluded that the glacial debris was deposited within a short distance (< 10 km) of the source. In view of these observations, and as a working estimate in the absence of other data, we estimated a transport half-distance of 5 km, and sampled at an average of one sample per 4 km 2 .…”

Section: Sediment Samplingmentioning

confidence: 99%

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Glacial sediment provenance, dispersal and deposition, Vestfold Hills, East Antarctica

2003

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Abstract:Field observations involving landform evaluation and the physical characterization of sediments, combined with a detailed analysis of the spatial distribution of bedrock and sediment geochemical patterns, suggests a limit to the glacial transport half-distance of c. 3 km in Vestfold Hills. Four morphologically distinct glacial deposits were sampled (small debris ridges, large debris ridges, debris drapes and valley fills) on the basis of field geometry. These landforms were subsequently distinguished by grain size, mineralogy and geochemistry. Since there are no nunataks south of Vestfold Hills, all debris is derived subglacially and sedimentological differences are attributed to the physical weathering of preglacial surfaces in Vestfold Hills and fluvial winnowing during deposition. Given that thrust geometries may occur in large debris ridges, glacial transport distances were short, and fluvial sorting of sediments was an important mechanism, reconstructions of glacial histories based on the stratigraphy of deposits in Vestfold Hills should be made with caution.

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Section: Discussionsupporting

confidence: 82%

Section: Sediment Samplingmentioning

confidence: 99%

Section: Sediment Samplingmentioning

confidence: 99%

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Glacial sediment provenance, dispersal and deposition, Vestfold Hills, East Antarctica

2003

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“…Samples of surficial salts were tasted and collected when found during field work on glacial deposits (Gore et al 1994). Salt samples were collected by scraping or lifting the salt from the bedrock or sediment surface with a penknife into a Petri dish that was then sealed.…”

Section: Sample Collectionmentioning

confidence: 99%

Composition, distribution and origin of surficial salts in the Vestfold Hills, East Antarctica

et al. 1996

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A regional chemical boundary termed the 'salt line', in the Vestfold Hills of East Antarctica, has been investigated using X-ray diffraction and electron probe analyses of surficial salts, and conductivity of surficial sediments. West of the salt line, halite and thenardite are abundant. These salts are derived from dispersal of marine aerosols, saturation of sediment by seawater during postglacial marine transgression, and glacial dispersal of salt-saturated fjord bottom sediments. East of the salt line, subglacial calcium carbonates and salts formed by chemical weathering of their substrates occur. Chemically and morphologically diverse minerals form the weathering products. They include two minerals not found previously in Antarctica, dypingite and hydromagnesite, and the first confirmed occurrence of brushite.

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“…For example, WR analyses show mappable trends that would help identify clasts with binheritedQ nuclides (Gore et al, 1994;Haeberli et al, 2003). WRs, when used in conjunction with other chronometric tools, can help isolate paleoclimatic signals (Nicholas and Butler, 1996).…”

Section: Time Indicatormentioning

confidence: 97%

In situ weathering rind erosion

Gordon

Dorn

2005

Geomorphology

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Derived constituents in the glacial sediments of the Vestfold Hills, East Antarctica

Cited by 13 publications

References 12 publications

Glacial sediment provenance, dispersal and deposition, Vestfold Hills, East Antarctica

Glacial sediment provenance, dispersal and deposition, Vestfold Hills, East Antarctica

Composition, distribution and origin of surficial salts in the Vestfold Hills, East Antarctica

In situ weathering rind erosion

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