East Antarctica | ScienceGate

The richest diatom complexes have revealed due to the study of glacial-marine sediments sampled in the Fisher Massif (Prince Charles Mountains, East Antarctica) during 52nd and 53rd Russian Antarctic Expeditions (Polar Marine Geol. Survey Expedition) in 2006/07 and 2007/08. Three diatom complexes are distinguished according to different palaeoecological conditions: the planktonic one is located in the basis of the outcrop, while mixed planktonic-benthic and benthic ones being located above. The planktonic diatom complexes are dominated by two oceanic species Actinocyclus ingens (up to 8%) and Denticulopsis simonseni (up to 80%). There are 15 planktonic algae, e. g. Eucampia аntarctica, Fragilariopsis spp., Rhizosolenia spp., Rouxia antarctica, Podosira antarctica sp. nov., Stellarima microtrias; and also unknown and non-described benthic diatoms Achnanthes sp., Cocconeis spp., Rhabdonema (s. l.) spp. and Synedra (s. l.) spp. Detailed data on morphology and taxonomy of 10 centric diatoms are presented, including 3 newly described species.

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The geochemical characteristics of the Jurassic plume magmatism within Ahlmannryggen massif (Queen Maud Land, East Antarctica)

Доклады Академии наук ◽

10.31857/s0869-5652486198-102 ◽

2019 ◽

Vol 486 (1) ◽

pp. 98-102

Author(s):

N. M. Sushchevskaya ◽

B. V. Belyatsky ◽

G. L. Leitchenkov ◽

V. G. Batanova ◽

A. V. Sobolev

Keyword(s):

Mantle Peridotite ◽

Oceanic Lithosphere ◽

East Antarctica ◽

Geochemical Characteristics ◽

Mantle Melting ◽

Plume Magmatism

Mesozoic dikes associated with the Karoo plume were studied within the East Antarctica where at Queen Maud Land on the Almannryggen massif high-Ti magnesian Fe-basalts were found. It is assumed that such basalts originate by means of the pyroxenite-containing mantle melting. The isotopic characteristics of the studied dolerites reflect the composition of the pyroxenite source - the ancient oceanic lithosphere (ЕМI), submerged at the mantle depths of 150-170 km in the paleosubduction zone of the Gondwanian continent and transformed 180 m.y. ago into the pyroxenite melt when interacting with the plume mantle peridotite.

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Satellite Altimeter Results Over East Antarctica

Annals of Glaciology ◽

10.3189/s0260305500002482 ◽

1982 ◽

Vol 3 ◽

pp. 32-35 ◽

Cited By ~ 2

Author(s):

R. L. Brooks

Keyword(s):

Tracking System ◽

Ice Sheet ◽

East Antarctica ◽

Satellite Altimeter ◽

Ice Shelves ◽

Ice Surface ◽

Operational Lifetime ◽

Waveform Retracking ◽

Better Than

During the operational lifetime of the Seasat altimeter from 3 July to 10 October 1978, more than 450 overflights were made over East Antarctica inland to latitude 72°S. An analysis of selected passes over a variety of ice features demonstrates that the oceanographic altimeter performed surprisingly well over the ice sheet and ice shelves, acquiring useful measurements during approximately 70% of each pass. The altimeter's onboard tracking system dampened out the ice-surface elevations, but post-flight retracking of the stored return waveforms reveals excellent ice-surface details. After waveform retracking, the altimeter repeatability is better than ±1 m.

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