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Author |
Callot J.P. & Geoffroy L. |
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Title |
Magma flow in the East Greenland dyke swarm inferred from AMS study: Magmatic growth of volcanic margin. |
Type |
Journal Article |
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Year |
2004 |
Publication |
Geophysical journal international |
Abbreviated Journal |
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Volume |
159 |
Issue |
2 |
Pages  |
816 - 830 |
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Abstract |
Volcanic passive margins (VPMs) are characterized by large volumes of melt emplaced within the lithosphere during break-up processes. Several data and a recently proposed conceptual model of volcanic margin development suggest that VPMs are fed from localized crustal zones of magma storage, underlying large polygenetic volcanoes localized above diapir-like instabilities of the asthenosphere. We investigated the magma flow pattern within the coast-parallel dyke swarm of the East Greenland VPM, which is the only outcropping VPM, over a distance of 125 km. The 44 sampled dykes are representative of the successive families of intrusions. Igneous petrofabrics are constrained by the measurements of the anisotropy of magnetic susceptibility. The magnetic fabrics are of medium to low anisotropy (P' < 1.08) and show moderately oblate ellipsoids (T > 0) . Flow-related fabrics are recorded in 75 per cent of the sampled dykes. We infer the flow directions from the imbrication geometry of the magnetic foliation planes at the dyke margins, and check the results by measuring the preferred orientation of plagioclase in thin sections cut in the magnetic principal planes. Due to probable fabric superposition, the magnetic lineation represents the zone axis for the distribution of magnetic foliation plane. We obtained 23 reliable flow directions that are predominantly horizontal and directed away from identified crustal reservoirs. This flow pattern supports the proposed model of VPM growth, and emphasizes the localized nature of the magma sources in the mantle. The entire flood basalt sequence appears to have been fed by a restricted number of crustal reservoirs and associated dyke swarms. |
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0956-540X |
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yes |
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2540 |
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Author |
Cherel Y. |
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Title |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica. |
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Journal Article |
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Year |
2008 |
Publication |
Marine biology |
Abbreviated Journal |
Mar. Biol. |
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154 |
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Pages |
813-821 |
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109 |
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0025-3162 |
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yes |
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4978 |
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Author |
Crouzet, N., Guillot, T., Fressin, F., Blazit, A |
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Title |
the A STEP team 2007, Front- vs. back-illuminated CCD cameras for photometric surveys: a noise budget analysis |
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Journal Article |
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Year |
2007 |
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Astronomische nachrichten |
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328 |
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805 |
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908 |
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0004-6337 |
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5220 |
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Author |
Belviso S., Moulin C., Bopp L. & Stefels J. |
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Assessment of a global climatology of oceanic dimethylsulfide (DMS) concentrations based on SeaWiFS imagery (1998-2001) |
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Journal Article |
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Year |
2004 |
Publication |
Canadian journal of fisheries and aquatic sciences |
Abbreviated Journal |
Can. J. Fish. Aquat. Sci. |
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61 |
Issue |
5 |
Pages |
804-816 |
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414;415 |
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ISSN |
0706-652X |
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yes |
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3430 |
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Author |
Corbel H, Morlon F, Groscolas R. |
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Title |
Is fledging in king penguin chicks related to changes in metabolic or endocrinal status? |
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Journal Article |
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Year |
2008 |
Publication |
Gen Comp Endocrinol. |
Abbreviated Journal |
Gen Comp Endocrinol. |
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Volume |
155 |
Issue |
3 |
Pages |
804-13 |
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Abstract |
This study examines the possibility that metabolic or endocrinal factors initiate fledging in the king penguin, a semi-altricial seabird species breeding a single chick on the ground. Chick fledging (departure to sea) occurred 5d after completion of the molt. It was preceded by a 16d fasting period and by a 7-fold increase in locomotor activity. From the measurement of the plasma concentration of metabolites and of glucagon and insulin, pre-fledging king penguin chicks were found to adapt to fasting in a classical way, i.e. by sparing body protein and mobilizing fat stores. At fledging, chicks were in phase II of fasting and their departure to sea was not stimulated by reaching critical energy depletion (phase III), in contrast to that which has been reported in breeding-fasting adults. The plasma level of corticosterone remained unchanged throughout the whole pre-fledging period, providing no support for a role of this stress-hormone in the facilitation of fledging. Thus, king penguin fledglings did not appear to be environmentally or nutritionally stressed. The plasma levels of thyroid hormones were elevated during the pre-fledging molt, in accordance with their key role in molt control in adult penguins. These levels declined by the time of the molt end, the plasma level of T4 thereafter being directly related to the time left before fledging. These results do not support the view that chronically elevated levels of thyroid hormones are required for the energy-demanding transition between being ashore and in cold water, but they suggest that the maintenance of high T4 levels may delay fledging. |
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119 |
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Bachelor's thesis |
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0016-6480 |
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yes |
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5018 |
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Frezzotti M., Pourchet M., Flora O., Gandolfi S., Gay M., Urbini S., Vincent C., Becagli S., Gragnani R., Proposito M., Severi M.,Traversi R., Udisti R., Fily M. |
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Title |
New estimations of precipitation and surface sublimation in East Antarctica from snow accumulation measurements,. |
Type |
Journal Article |
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Year |
2004 |
Publication |
Climate dynamics |
Abbreviated Journal |
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Volume |
23 |
Issue |
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Pages |
803-813 |
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Abstract |
Talos Dome is an ice dome on the edge of the East Antarctic plateau; because accumulation is higher here than in other domes of East Antarctica, the ice preserves a good geochemical and palaeoclimatic record. A new map of the Talos Dome area locates the dome summit using the global positioning system (GPS) (72?47’ 14’’S, 159?04’ 2’’E; 2318.5m elevation (WGS84)). A surface strain network of nine stakes was measured using GPS. Data indicate that the stake closest to the summit moves south-southeast at a few cma–1. The other stakes, located 8 km away, move up to 0.33ma–1. Airborne radar measurements indicate that the bedrock at the Talos Dome summit is about 400m in elevation, and that it is covered by about 1900m of ice. Snow radar and GPS surveys show that internal layering is continuous and horizontal in the summit area (15 km radius). The depth distribution analysis of snow radar layers reveals that accumulation decreases downwind of the dome (north-northeast) and increases upwind (south-southwest). The palaeomorphology of the dome has changed during the past 500 years, probably due to variation in spatial distribution of snow accumulation, driven by wind sublimation. In order to calculate a preliminary age vs depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated. This model predicts that the ice 100m above the bedrock may cover one glacial–interglacial period. |
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960 |
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ISSN |
0930-7575 |
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yes |
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Serial |
2975 |
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Author |
Poulin E. & Feral J.P. |
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Title |
Genetic structure of the brooding sea urchin Abatus cordatus, an endemic of the subantarctic Kerguelen Island, and the origin of the diversity of antarctic echinoids. |
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Conference - International - Article with Reading Comitee |
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Year |
1998 |
Publication |
Echinoderms |
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793-795 |
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Abstract |
: San Francisco, Proc.9th Intn.Echinoderm Conf. |
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195 |
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yes |
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609 |
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Author |
Grémillet D., Kuntz G., Delbart F., Mellet M., Kato A., Robin J-P., Chaillon P-E., Gendner J-P., Lorentsen S-H. & Le Maho Y. |
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Title |
Linking the foraging performance of a marine predator with local prey abundance |
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Journal Article |
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2004 |
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Functional ecology |
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18 |
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Pages |
793-801 |
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388 |
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0269-8463 |
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3468 |
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Author |
Van Camp M., Steim J., Rapagnani G. and Rivera L. |
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Title |
Connecting a Quanterra Datalogger Q330 on the GWR C021 Superconducting Gravimeter |
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Journal Article |
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Year |
2008 |
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SEISMOLOGICAL RESEARCH LETTERS |
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79 |
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785-796 |
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133 |
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0895-0695 |
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yes |
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5812 |
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Author |
Ann Marie Aglionby Harding, Carsten Egevang, Wojciech Walkusz, Flemming Merkel, Stephane Blanc & David Gremillet |
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Title |
Estimating prey capture rates of a planktivorous seabird, the little auk (Alle alle), using diet, diving behaviour, and energy consumption |
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Journal Article |
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2009 |
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POLAR BIOLOGY |
Abbreviated Journal |
Polar Biol. |
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Volume |
32 |
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785-793 |
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388 |
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0722-4060 |
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yes |
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Call Number |
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5845 |
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