inland ice mantle | ScienceGate

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Højmark Thomsen, H., Reeh, N., Olesen, O. B., Egede Bøggilde, C., Starzer, W., Weidick, A., & Higgins, A. K. (1997). The Nioghalvfjerdsfjorden glacier project, North-East Greenland: a study of ice sheet response to climatic change. Geology of Greenland Survey Bulletin, 176, 95-103. https://doi.org/10.34194/ggub.v176.5073 _______________ Glaciological research was initiated in 1996 on the floating glacier tongue filling Nioghalvfjerdsfjorden in NorthEast Greenland (Fig. 1), with the aim of acquiring a better understanding of the response of the Greenland ice sheet (Inland Ice) to changing climate, and the implications for future sea level. The research is part of a three year project (1996–98) to advance research into the basic processes that contribute to changes in the ocean volume with a changing climate. Five nations are participants in the project, which is supported by the European Community (EC) Environment and Climate Programme. The Geological Survey of Denmark and Greenland (GEUS) and the Danish Polar Center are the Danish partners in the project, both with integrated research themes concentrated on and around Nioghalvfjerdsfjorden.

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Qaanaaq 2001: mineral exploration reconnaissance in North-West Greenland

Geological Survey of Denmark and Greenland Bulletin ◽

10.34194/ggub.v191.5141 ◽

2002 ◽

pp. 133-143

Author(s):

Bjørn Thomassen ◽

Peter R. Dawes ◽

Agnete Steenfelt ◽

Johan Ditlev Krebs

Keyword(s):

Mineral Exploration ◽

Mining Industry ◽

Field Work ◽

Original Series ◽

West Greenland ◽

North West ◽

Ice Caps ◽

High Plateau ◽

Set Up ◽

Inland Ice

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Thomassen, B., Dawes, P. R., Steenfelt, A., & Krebs, J. D. (2002). Qaanaaq 2001: mineral exploration reconnaissance in North-West Greenland. Geology of Greenland Survey Bulletin, 191, 133-143. https://doi.org/10.34194/ggub.v191.5141 _______________ Project Qaanaaq 2001, involving one season’s field work, was set up to investigate the mineral occurrences and potential of North-West Greenland between Olrik Fjord and Kap Alexander (77°10´N – 78°10´N; Fig. 1). Organised by the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, the project is mainly funded by the latter and has the overall goal of attracting the interest of the mining industry to the region. The investigated region – herein referred to as the Qaanaaq region – comprises 4300 km2 of ice-free land centred on Qaanaaq, the administrative capital of Qaanaap (Thule) municipality. Much of the region is characterised by a 500–800 m high plateau capped by local ice caps and intersected by fjords and glaciers. High dissected terrain occurs in Northumberland Ø and in the hinterland of Prudhoe Land where nunataks are common along the margin of the Inland Ice.

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Site information and initial results from deep ice drilling on Law Dome, Antarctica

Journal of Glaciology ◽

10.3189/s0022143000002768 ◽

1997 ◽

Vol 43 (143) ◽

pp. 3-10 ◽

Cited By ~ 10

Author(s):

V.I. Morgan ◽

C.W. Wookey ◽

J. Li ◽

T.D. van Ommen ◽

W. Skinner ◽

...

Keyword(s):

Ice Core ◽

Ice Sheet ◽

High Accumulation ◽

Ice Flow ◽

Ice Cap ◽

Basal Ice ◽

Inland Ice ◽

The Last Glacial Maximum ◽

Initial Results ◽

The Last Glacial

AbstractThe aim of deep ice drilling on Law Dome, Antarctica, has been to exploit the special characteristics of Law Dome summit, i.e. low temperature and high accumulation near an ice divide, to obtain a high-resolution ice core for climatic/environmental studies of the Holocene and the Last Glacial Maximum (LGM). Drilling was completed in February 1993, when basal ice containing small fragments of rock was reached at a depth of 1196 m. Accurate ice dating, obtained by counting annual layers revealed by fine-detail δ18О, peroxide and electrical-conductivity measurements, is continuous down to 399 m, corresponding to a date of AD 1304. Sulphate concentration measurements, made around depths where conductivity tracing indicates volcanic fallout, allow confirmation of the dating (for Agung in 1963 and Tambora in 1815) or estimates of the eruption date from the ice dating (for the Kuwae, Vanuatu, eruption ~1457). The lower part of the core is dated by extrapolating the layer-counting using a simple model of the ice flow. At the LGM, ice-fabric measurements show a large decrease (250 to 14 mm2) in crystal size and a narrow maximum in c-axis vertically. The main zone of strong single-pole fabrics however, is located higher up in a broad zone around 900 m. Oxygen-isotope (δ18O) measurements show Holocene ice down to 1113 m, the LGM at 1133 m and warm (δ18O) about the same as Holocene) ice near the base of the ice sheet. The LGM/Holocene δ18O shift of 7.0‰, only ~1‰ larger than for Vostok, indicates that Law Dome remained an independent ice cap and was not overridden by the inland ice sheet in the Glacial.

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NORDENSKIOLD ON THE INLAND ICE OF GREENLAND

Science ◽

10.1126/science.ns-2.44.732 ◽

1883 ◽

Vol ns-2 (44) ◽

pp. 732-738 ◽

Cited By ~ 15

Author(s):

A. E. NORDENSKIOLD

Keyword(s):

Inland Ice

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TRIGONOMETRICAL LEVELLING ACROSS THE INLAND ICE IN NORTH GREENLAND

Empire Survey Review ◽

10.1179/sre.1956.13.100.252 ◽

1956 ◽

Vol 13 (100) ◽

pp. 252-261 ◽

Cited By ~ 5

Author(s):

W. S. B. Paterson ◽

C. G. M. Slesser

Keyword(s):

Inland Ice ◽

North Greenland

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The contribution of polar expeditions to the science of glaciology

Polar Record ◽

10.1017/s0032247400044600 ◽

1949 ◽

Vol 5 (37-38) ◽

pp. 324-331 ◽

Cited By ~ 7

Author(s):

Hans W:Son Ahlmann

Keyword(s):

Polar Regions ◽

Inland Ice

Polar research is significant to glaciologists first because real inland ice is found only in the polar regions, and secondly because most of the glaciers there belongto a distinct geophysical type. It is therefore remarkable that the snow, iceand glaciers of these regions only recently became objects of interest and study.

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III.—Recent Observations on the Glaciation of British Columbia and Adjacent Regions

Geological Magazine ◽

10.1017/s0016756800182159 ◽

1888 ◽

Vol 5 (8) ◽

pp. 347-350 ◽

Cited By ~ 8

Author(s):

Geo. M. Dawson

Keyword(s):

British Columbia ◽

Glacial Period ◽

Coast Range ◽

Coast Mountains ◽

One Stage ◽

Queen Charlotte Islands ◽

Glacier Ice ◽

Inland Ice ◽

Great Valley ◽

The U.S

Previous observations in British Columbia have shown that at one stage in the Glacial period—that of maximum glaciation—a great confluent ice-mass has occupied the region which may be named the Interior Plateau, between the Coast Mountains and Gold and Eocky Mountain Kanges. From the 55th to the 49th parallel this great glacier has left traces of its general southward or southeastward movement, which are distinct from those of subsequent local glaciers. The southern extensions or terminations of this confluent glacier, in Washington and Idaho Territories, have quite recently been examined by Mr. Bailley Willis and Prof. T. C. Chamberlin, of the U.S. Geological Survey. There is, further, evidence to show that this inland-ice flowed also, by transverse valleys and gaps, across the Coast Range, and that the fiords of the coast were thus deeply filled with glacier-ice which, supplemented by that originating on the Coast Range itself, buried the entire great valley which separates Vancouver Island from the mainland and discharged seaward round both ends of the island. Further north, the glacier extending from the mainland coast touched the northern shores of the Queen Charlotte Islands.

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Photogrammetric and Satellite Mapping of the Margin of the Inland Ice, West Greenland

Annals of Glaciology ◽

10.3189/s0260305500001373 ◽

1986 ◽

Vol 8 ◽

pp. 164-167 ◽

Cited By ~ 1

Author(s):

H.H. Thomsen

Keyword(s):

Surface Feature ◽

Aerial Photographs ◽

Water Drainage ◽

Feature Maps ◽

Hydro Power ◽

Surface Features ◽

Power Stations ◽

Run Off ◽

Set Up ◽

Inland Ice

Glaciological investigations have been carried out in areas proposed for local hydro-power stations in Greenland, A mapping programme was set up, to provide data for mass balance and simulation of run-off, as well as glacier dynamics.Two types of glacier map have been produced, covering the margin of the Inland Ice: detailed photogrammetric maps, based on plotting from vertical aerial photographs and a new type of surface feature map, based on digitally-processed Landsat data. The photogrammetric maps, plotted on a scale of 1:25 000, include surface topography and surface features, such as crevasses, lakes, moraines etc. The surface feature maps, plotted on a scale of 1:100 000, show surface features related to ice and melt-water drainage, as well as subtle, topographic features, related to the subglacial topography.The maps have so far been used for preliminary delineation of drainage areas on the Inland Ice and for planning tracks of radio echo-soundings.

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Neoglacial change of ice cover and the related response of the Earth's crust in West Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v159.8220 ◽

1993 ◽

Vol 159 ◽

pp. 121-126

Author(s):

A Weidick

Keyword(s):

Spatial Distribution ◽

Sea Level ◽

Early Holocene ◽

Relative Sea Level ◽

West Greenland ◽

Exact Data ◽

Present Information ◽

Long Time ◽

Related Response ◽

Inland Ice

The cooling trends of Neoglacial time caused re-formation of minor local glaciers and expansion of the Inland Ice margin. A consequence of this glacial reactivation in West Greenland was the conversion of an early Holocene glacio-isostatic emergence to Neoglacial submergence. Although the major trends of fluctuations of ice margins and relative sea level have been studied over a long time, exact data on the spatial distribution of Neoglacial changes of glacier load and relative sea level are still sparse. Present information points to a major conversion from emergence to submergence between 1000 and 3000 B.P., depending on location and the effect of superimposed secondary oscillations.

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The Nordre Strømfjord shear zone and the Arfersiorfik quartz diorite in Arfersiorfik, the Nagssugtoqidian orogen, West Greenland

Geological Survey of Denmark and Greenland Bulletin ◽

10.34194/geusb.v11.4922 ◽

2006 ◽

Vol 11 ◽

pp. 145-162 ◽

Cited By ~ 2

Author(s):

Kai Sørensen ◽

John A. Korstgård ◽

William E. Glassley ◽

Bo Møller Stensgaard

Keyword(s):

Shear Zone ◽

Volcanic Rocks ◽

Quartz Diorite ◽

Ductile Deformation ◽

Chemical Compositions ◽

West Greenland ◽

South West ◽

Wide Range ◽

Inland Ice ◽

Zone Deformation

The Nordre Strømfjord shear zone in the fjord Arfersiorfik, central West Greenland, consists of alternating panels of supracrustal rocks and orthogneisses which together form a vertical zone up to 7 km wide with sinistral transcurrent, ductile deformation, which occurred under middle amphibolite facies conditions. The pelitic and metavolcanic schists and paragneisses are all highly deformed, while the orthogneisses appear more variably deformed, with increasing deformation evident towards the supracrustal units. The c. 1.92 Ga Arfersiorfik quartz diorite is traceable for a distance of at least 35 km from the Inland Ice towards the west-south-west. Towards its northern contact with an intensely deformed schist unit it shows a similar pattern of increasing strain, which is accompanied by chemical and mineralogical changes. The metasomatic changes associated with the shear zone deformation are superimposed on a wide range of original chemical compositions, which reflect magmatic olivine and/ or pyroxene as well as hornblende fractionation trends. The chemistry of the Arfersiorfik quartz diorite suite as a whole is comparable to that of Phanerozoic plutonic and volcanic rocks of calc-alkaline affinity.

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