Update search
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Southern Africa
-
Namibia (1)
-
-
-
Antarctica
-
Antarctic ice sheet
-
East Antarctic ice sheet (5)
-
West Antarctic ice sheet (2)
-
-
East Antarctica (4)
-
Marie Byrd Land (1)
-
South Pole (1)
-
Transantarctic Mountains (1)
-
Vostok Station (1)
-
West Antarctica (2)
-
Wilkes Land
-
Law Dome (1)
-
-
-
Arctic Ocean
-
Barents Sea (1)
-
-
Arctic region
-
Greenland
-
Greenland ice sheet (2)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Gulf of Saint Lawrence (1)
-
-
-
Baffin Bay (1)
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Labrador (1)
-
-
Quebec
-
Magdalen Islands (1)
-
-
-
-
Channeled Scabland (1)
-
Eagle Lake (1)
-
Europe
-
Central Europe
-
Austria
-
Tyrol Austria (1)
-
-
-
Western Europe
-
Iceland (1)
-
Scandinavia
-
Norway
-
Northern Norway (1)
-
-
-
United Kingdom
-
Great Britain
-
Scotland
-
Highland region Scotland (1)
-
-
-
-
-
-
North America
-
Great Lakes
-
Lake Michigan (1)
-
-
-
Southern Ocean (1)
-
United States
-
California
-
Yosemite National Park (1)
-
-
Illinois
-
Cook County Illinois
-
Chicago Illinois (1)
-
-
-
Washington
-
Okanogan County Washington (1)
-
-
Wisconsin (1)
-
-
-
elements, isotopes
-
carbon
-
C-14 (1)
-
-
isotope ratios (1)
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
O-18/O-16 (1)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
-
geochronology methods
-
paleomagnetism (2)
-
Th/U (1)
-
U/Pb (1)
-
uranium disequilibrium (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (2)
-
Pleistocene
-
Lake Missoula (1)
-
upper Pleistocene
-
Barents ice sheet (1)
-
Eemian (1)
-
Wisconsinan (1)
-
-
-
-
Tertiary
-
Neogene
-
Pliocene (1)
-
-
-
-
Laurentide ice sheet (1)
-
Paleozoic
-
upper Paleozoic (1)
-
-
Precambrian (1)
-
-
igneous rocks
-
igneous rocks
-
volcanic rocks
-
basalts (1)
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses (1)
-
metaigneous rocks
-
serpentinite (1)
-
-
metasomatic rocks
-
serpentinite (1)
-
-
-
-
minerals
-
carbonates
-
aragonite (1)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (1)
-
-
-
-
framework silicates
-
feldspar group
-
plagioclase (1)
-
-
-
sheet silicates
-
mica group (1)
-
-
-
-
Primary terms
-
absolute age (4)
-
Africa
-
Southern Africa
-
Namibia (1)
-
-
-
Antarctica
-
Antarctic ice sheet
-
East Antarctic ice sheet (5)
-
West Antarctic ice sheet (2)
-
-
East Antarctica (4)
-
Marie Byrd Land (1)
-
South Pole (1)
-
Transantarctic Mountains (1)
-
Vostok Station (1)
-
West Antarctica (2)
-
Wilkes Land
-
Law Dome (1)
-
-
-
Arctic Ocean
-
Barents Sea (1)
-
-
Arctic region
-
Greenland
-
Greenland ice sheet (2)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Gulf of Saint Lawrence (1)
-
-
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Labrador (1)
-
-
Quebec
-
Magdalen Islands (1)
-
-
-
-
carbon
-
C-14 (1)
-
-
Cenozoic
-
Quaternary
-
Holocene (2)
-
Pleistocene
-
Lake Missoula (1)
-
upper Pleistocene
-
Barents ice sheet (1)
-
Eemian (1)
-
Wisconsinan (1)
-
-
-
-
Tertiary
-
Neogene
-
Pliocene (1)
-
-
-
-
climate change (1)
-
crust (3)
-
data processing (1)
-
deformation (4)
-
earthquakes (1)
-
Europe
-
Central Europe
-
Austria
-
Tyrol Austria (1)
-
-
-
Western Europe
-
Iceland (1)
-
Scandinavia
-
Norway
-
Northern Norway (1)
-
-
-
United Kingdom
-
Great Britain
-
Scotland
-
Highland region Scotland (1)
-
-
-
-
-
-
faults (1)
-
folds (1)
-
foliation (1)
-
geochemistry (1)
-
geology (1)
-
geomorphology (2)
-
geophysical methods (9)
-
glacial geology (21)
-
ground water (1)
-
hydrology (3)
-
igneous rocks
-
volcanic rocks
-
basalts (1)
-
-
-
Integrated Ocean Drilling Program
-
Expedition 318 (1)
-
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
O-18/O-16 (1)
-
-
-
magmas (1)
-
metamorphic rocks
-
gneisses (1)
-
metaigneous rocks
-
serpentinite (1)
-
-
metasomatic rocks
-
serpentinite (1)
-
-
-
North America
-
Great Lakes
-
Lake Michigan (1)
-
-
-
Ocean Drilling Program
-
Leg 105
-
ODP Site 645 (1)
-
-
-
ocean floors (2)
-
oxygen
-
O-18/O-16 (1)
-
-
paleoclimatology (2)
-
paleogeography (1)
-
paleomagnetism (2)
-
Paleozoic
-
upper Paleozoic (1)
-
-
permafrost (1)
-
plate tectonics (1)
-
Precambrian (1)
-
remote sensing (4)
-
sea-level changes (1)
-
sedimentary rocks
-
clastic rocks
-
diamictite (1)
-
-
-
sedimentary structures
-
soft sediment deformation (1)
-
-
sedimentation (4)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
boulders (2)
-
diamicton (1)
-
dust (1)
-
till (7)
-
-
gyttja (1)
-
marine sediments (1)
-
-
Southern Ocean (1)
-
stratigraphy (2)
-
United States
-
California
-
Yosemite National Park (1)
-
-
Illinois
-
Cook County Illinois
-
Chicago Illinois (1)
-
-
-
Washington
-
Okanogan County Washington (1)
-
-
Wisconsin (1)
-
-
-
sedimentary rocks
-
oolite (1)
-
sedimentary rocks
-
clastic rocks
-
diamictite (1)
-
-
-
-
sedimentary structures
-
sedimentary structures
-
soft sediment deformation (1)
-
-
striations (2)
-
-
sediments
-
oolite (1)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
boulders (2)
-
diamicton (1)
-
dust (1)
-
till (7)
-
-
gyttja (1)
-
marine sediments (1)
-
-
GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
subglacial processes
Anatomy of a 300 Myr old fjord in Namibia Open Access
Aeromagnetic data reveals buried Quaternary drainage patterns in the Gulf of St Lawrence (Canada) Available to Purchase
Okanogan lobe tunnel channels and subglacial floods into Moses Coulee, Channeled Scabland, northwestern United States Open Access
Net evolution of subglacial sediment transport in the Quebec–Labrador sector of the Laurentide Ice Sheet Open Access
Subglacial tills: a process model based on microsedimentological clues Open Access
Sedimentation associated with glaciovolcanism: a review Available to Purchase
Abstract Three discrete categories of sedimentary deposits are associated with glaciovolcanism: englacial cavity, jökulhlaup and lahar. Englacial cavity deposits are found in water-filled chambers in the lee of active glaciovolcanoes or at a locus of enhanced geothermal heat flux. The cavities provide a depocentre for the accumulation of debris, either abundant fresh juvenile debris with sparse dropstones (associated with active glaciovolcanism) or polymict basal glacial debris in which dropstones are abundant (associated with geothermal hot spots). Described examples are uncommon. By contrast, volcanogenic jökulhlaup deposits are abundant, mainly in Iceland, where they form extensive sandar sequences associated with ice- covered volcanoes. Jökulhlaups form as a result of the sudden subglacial discharge of stored meltwater. Analogous deposits known as glaciovolcanic sheet-like sequences represent the ultra-proximal lateral equivalents deposited under the ice. Glaciovolcanic lahars are associated with ice- capped volcanoes. They form as a result of explosive eruptions through relatively thin ice or following dome collapse, and they trigger mainly supraglacial rather than subglacial meltwater escape. Sediment transport and depositional processes are similar in jökulhaups and lahars and are dominated by debris flow and hyperconcentrated or supercritical flow modes during the main flood stage, although the proportions of the principal lithofacies are different.
A power-based abrasion law for use in landscape evolution models Available to Purchase
An experimental baseline for ice-till strain indicators Available to Purchase
Rapid geomorphological and sedimentological changes at a modern Alpine ice margin: lessons from the Gepatsch Glacier, Tirol, Austria Open Access
Chapter 7.5 Active subglacial volcanism in West Antarctica Available to Purchase
Abstract A combination of aerogeophysics, seismic observations and direct observation from ice cores, and subglacial sampling, has revealed at least 21 sites under the West Antarctic Ice Sheet consistent with active volcanism (where active is defined as volcanism that has interacted with the current manifestation of the West Antarctic Ice Sheet). Coverage of these datasets is heterogeneous, potentially biasing the apparent distribution of these features. Also, the products of volcanic activity under thinner ice characterized by relatively fast flow are more prone to erosion and removal by the ice sheet, and therefore potentially under-represented. Unsurprisingly, the sites of active subglacial volcanism that we have identified often overlap with areas of relatively thick ice and slow ice surface flow, both of which are critical conditions for the preservation of volcanic records. Overall, we find the majority of active subglacial volcanic sites in West Antarctica concentrate strongly along the crustal-thickness gradients bounding the central West Antarctic Rift System, complemented by intra-rift sites associated with the Amundsen Sea–Siple Coast lithospheric transition.
Controls on subglacial bedrock erosion and morphology near Drumnadrochit, Scotland Available to Purchase
Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation Available to Purchase
Composition and formation age of amorphous silica coating glacially polished surfaces Open Access
The Quaternary geology of the southern Chicago metropolitan area: The Chicago outlet, morainic systems, glacial chronology, and Kankakee Torrent Available to Purchase
ABSTRACT The Eagle Lake basin was formed by collapse of the ablating Lake Michigan lobe over a tunnel valley and subsequent reoccupation of the collapse basin by the lobe during local final phase of glaciation. Latest collapse occurred prior to about 16,250 but after 18,600 cal yr B.P. A hydrologically open lake occupied Eagle Lake basin from 16,250 cal yr B.P. to the present. The lake was described in 1834 by the original land survey, but was drained for agriculture by 1939.
A healing mechanism for stick-slip of glaciers Available to Purchase
Exploration of subsurface Antarctica: uncovering past changes and modern processes Open Access
Abstract The Antarctic continent, which contains enough ice to raise sea level globally by around 60 m, is the last major scientific frontier on our planet. We know far more about the surfaces of the Moon, Mars and around half of Pluto than we do about the underside of the Antarctic ice sheet. Geophysical exploration is the key route to measuring the ice sheetâs internal structure and the land on which the ice rests. From such measurements, we are able to reveal how the ice sheet flows, and how it responds to atmospheric and ocean warming. By examining landscapes that have been moulded by former ice flow, we are able to identify how the ice sheet behaved in the past. Geophysics is therefore critical to understanding change in Antarctica.
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior Available to Purchase
Abstract Near the South Pole, a large subglacial lake exists beneath the East Antarctic Ice Sheet less than 10 km from where the bed temperature is inferred to be −9°C. A thermodynamic model was used to investigate the apparent contradiction of basal water existing in the vicinity of a cold bed. Model results indicate that South Pole Lake is freezing and that neither present-day geothermal flux nor ice flow is capable of producing the necessary heat to sustain basal water at this location. We hypothesize that the lake comprises relict water formed during a different configuration of ice dynamics when significant frictional heating from ice sliding was available. Additional modelling of assumed basal sliding shows frictional heating was capable of producing the necessary heat to fill South Pole Lake. Independent evidence of englacial structures measured by airborne radar revel ice-sheet flow was more dynamic in the past. Ice sliding is estimated to have ceased between 16.8 and 10.7 ka based on an ice chronology from a nearby borehole. These findings reveal major post-Last Glacial Maximum ice-dynamic change within the interior of East Antarctica, demonstrating that the present interior ice flow is different than that under full glacial conditions.
Position and variability of complex structures in the central East Antarctic Ice Sheet Available to Purchase
Abstract Although the flow of the East Antarctic Ice Sheet is well constrained from surface measurements and altimetry, our knowledge of the dynamic processes within the ice sheet remains limited. Recent high-resolution radar data from the Gamburtsev Subglacial Mountains in central East Antarctica reveal a series of anomalous englacial reflectors in the lower half of the ice column that cannot be explained by conventional ice flow. Expanding on previous analyses, we describe the geometrical and morphological features of 12 of these anomalous reflectors. Our description reveals a previously unacknowledged diversity in size, geometry and internal structure of these reflectors. We are able to identify four distinct morphological features: (1) fingers; (2) inclusions; (3) sheets; and (4) folds. The ‘fingers’ and ‘inclusions’ probably form by shear instabilities at the boundary between the reflectors and the surrounding meteoric ice. The ‘sheets’ highlight that basal ice can be uplifted off of the bed and above surrounding meteoric ice, and the ‘folds’ may have formed in local regions of converging flow associated with subglacial topography. The study provides key insights into the rheology, stress and deformational regimes deep within the central East Antarctic Ice Sheet.
Summit of the East Antarctic Ice Sheet underlain by thick ice-crystal fabric layers linked to glacial–interglacial environmental change Open Access
Abstract Ice cores in Antarctica and Greenland reveal ice-crystal fabrics that can be softer under simple shear compared with isotropic ice. Owing to the sparseness of ice cores in regions away from the ice divide, we currently lack information about the spatial distribution of ice fabrics and its association with ice flow. Radio-wave reflections are influenced by ice-crystal alignments, allowing them to be tracked provided reflections are recorded simultaneously in orthogonal orientations (polarimetric measurements). Here, we image spatial variations in the thickness and extent of ice fabric across Dome A in East Antarctica, by interpreting polarimetric radar data. We identify four prominent fabric units, each several hundred metres thick, extending over hundreds of square kilometres. By tracing internal ice-sheet layering to the Vostok ice core, we are able to determine the approximate depth–age profile at Dome A. The fabric units correlate with glacial–interglacial cycles, most noticeably revealing crystal alignment contrasts between the Eemian and the glacial episodes before and after. The anisotropy within these fabric layers has a spatial pattern determined by ice flow over subglacial topography.