The Campanian–Maastrichtian interval at The Naze, James Ross Island, Antarctica: microbiostratigraphic and paleoenvironmental study

2021 ◽  
Vol 120 ◽  
pp. 104725
Author(s):  
Enelise Katia Piovesan ◽  
Osvaldo José Correia Filho ◽  
Robbyson Mendes Melo ◽  
Luiz Drude Lacerda ◽  
Rodolfo Otávio Dos Santos ◽  
...  
Keyword(s):  
James Ross Island

scholarly journals Geomorphology of Ulu Peninsula, James Ross Island, Antarctica

2021 ◽  
Vol 17 (2) ◽  
pp. 125-139
Author(s):  
Stephen J. A. Jennings ◽  
Bethan J. Davies ◽  
Daniel Nývlt ◽  
Neil F. Glasser ◽  
Zbyněk Engel ◽  
...  
Keyword(s):  
James Ross Island

scholarly journals Observations on a Debris-Covered Polar Glacier “Whisky Glacier”, James Ross Island, Antarctic Peninsula, Antarctica

1987 ◽  
Vol 33 (115) ◽  
pp. 300-310 ◽  
Author(s):  
T.J.H. Chinn ◽  
A. Dillon
Keyword(s):  
Antarctic Peninsula ◽  
Rock Glacier ◽  
Freezing Front ◽  
Extensive Area ◽  
Free Zone ◽  
Rock Glaciers ◽  
James Ross Island ◽  
Polythermal Glacier ◽  
Powerful Mechanism

Abstract“Whisky Glacier” on James Ross Island, Antarctic Peninsula, comprises anévéand clean ice trunk surrounded by an extensive area of debris-covered ice resembling a rock glacier. The debris-free trunk of the glacier abuts abruptly against the broad, totally debris-covered tongue at a number of concentric zones where debris-laden beds crop out at the surface in a manner similar to the “inner moraine” formations of many polar glaciers.Ice structures and foliation suggest that “Whisky Glacier” is a polythermal glacier which is wet-based under the debris-free zone, and dry-based under the debris-covered zone. It is surmised that the glacier sole crosses the freezing front close to where the basal debris beds are upwarped towards the surface. Here, basal water is confined, and freezes to the under side of the glacier in thick beds of regelation ice which are uplifted to the surface along with the debris-laden beds. Ablation losses effectively cease beneath the blanket of debris covering the tongue.The transition from wet-based to dry-based conditions at the glacier sole is a powerful mechanism for entraining debris into a glacier and, in the case of “Whisky Glacier”, for lifting debris to the surface. It is suggested that this may be a mechanism for forming some polar rock glaciers.

scholarly journals The oldest hexanchiform shark from the Southern Hemisphere (Neoselachii; Early Cretaceous, Antarctica)

2009 ◽  
Vol 21 (5) ◽  
pp. 501-504 ◽  
Author(s):  
Alberto Luis Cione ◽  
Francisco Medina
Keyword(s):  
Southern Hemisphere ◽  
Antarctic Peninsula ◽  
Early Cretaceous ◽  
The Other ◽  
James Ross Island

AbstractThe oldest record of the hexanchiform sharks from the Southern Hemisphere and the second chondrichthyan report known from Carboniferous to Early Cretaceous beds in Antarctica is given. The material was collected in late Aptian rocks of the Kotick Point Formation outcropping in the western part of James Ross Island, near Antarctic Peninsula. It consists of an isolated tooth assignable to a hexanchiform different from the other described genera. The tooth shows putative plesiomorphic cusp (few cusps, no serrations) and apomorphic root characters (relatively deep, quadrangular). It could be related to a species close to the origin ofHexanchus(unknown in beds older than Cenomanian).

Palynofacies as indicators of paleoenvironmental changes in a Cretaceous succession from the Larsen Basin, James Ross Island, Antarctica

2013 ◽  
Vol 295 ◽  
pp. 53-66 ◽  
Author(s):  
Marcelo de A. Carvalho ◽  
Renato R. Cabral Ramos ◽  
Monika Beatriz Crud ◽  
Luciana Witovisk ◽  
Alexander W.A. Kellner ◽  
...  
Keyword(s):  
Paleoenvironmental Changes ◽  
James Ross Island

Why do calcareous microfossils preferentially occur in tuffaceous sandstones of the Santa Marta formation (James Ross Island, Antarctica)?

2021 ◽  
pp. 103682
Author(s):  
Rafael R. da Silva ◽  
Karlos G.D. Kochhann ◽  
Rodrigo M. Guerra ◽  
Gerson Fauth ◽  
Marcelo de A. Carvalho ◽  
...  
Keyword(s):  
James Ross Island ◽  
Calcareous Microfossils

Pinnularia subcatenaborealis sp. nov. (Bacillariophyta) a new chain-forming diatom species from King George Island (Maritime Antarctica)

Phytotaxa ◽  
2018 ◽  
Vol 364 (3) ◽  
pp. 259 ◽  
Author(s):  
NATALIA KOCHMAN-KĘDZIORA ◽  
EVELINE PINSEEL ◽  
MATEUSZ RYBAK ◽  
TERESA NOGA ◽  
MARIA OLECH ◽  
...  
Keyword(s):  
Morphological Characteristics ◽  
New Taxon ◽  
King George Island ◽  
Maritime Antarctica ◽  
Glacier Forefield ◽  
Valve Size ◽  
James Ross Island ◽  
Small Pool ◽  
A New Species ◽  
Freshwater Diatom

During a survey conducted on the freshwater diatom flora of small shallow pools on the Ecology Glacier forefield (King George Island, Maritime Antarctic Region), an unknown spine-bearing chain-forming Pinnularia species, belonging to the Pinnularia borealis species complex, was found. Although it closely resembles the recently described Pinnularia catenaborealis from James Ross Island and Vega Island (Antarctic Peninsula), a unique set of morphological characteristics revealed in both light and scanning electron microscopy clearly discriminates the specimens of King George Island as a new species. Pinnularia subcatenaborealis Kochman-Kędziora, Pinseel & Van de Vijver sp. nov. can be distinguished from P. catenaborealis by an overall smaller valve size, the presence of irregularly formed silica outgrowths on the mantle and small, irregular plates located near the apices. The new taxon is so far only recorded from a small pool with circumneutral pH and very low conductivity.

scholarly journals Technical innovations and optimizations for intermediate ice-core drilling operations

2014 ◽  
Vol 55 (68) ◽  
pp. 243-252 ◽  
Author(s):  
Jack Triest ◽  
Robert Mulvaney ◽  
Olivier Alemany
Keyword(s):  
Ice Core ◽  
Working Environment ◽  
Column Height ◽  
Drill Fluid ◽  
Drilling Operations ◽  
Remote Sites ◽  
James Ross Island ◽  
Technical Innovations ◽  
Set Up ◽  
Core Storage

AbstractThe British Antarctic Survey, in collaboration with Laboratoire de Glaciologie et Géophysique de l’Environnement, has in recent years successfully drilled to bedrock on three remote sites around the Antarctic Peninsula. Based on the experience from the multi-season project at Berkner Island (948m depth, 2002–05) we optimized the drill set-up to better suit two subsequent single-season projects at James Ross Island (363m depth, 2008) and Fletcher Promontory (654m depth, 2012). The adaptations, as well as the reasons for them, are discussed in detail and include a drill tent set-up without a trench; drilling without a borehole casing with a relatively low fluid column height; and using a shorter drill. These optimizations were aimed at reducing cargo loads and installation time while maintaining good core quality, productivity and a safe working environment. In addition, we introduce a number of innovations, ranging from a new lightweight cable tensioning device and drill-head design to core storage and protection trays. To minimize the environmental impact, all the drill fluid was successfully recovered at both sites and we describe and evaluate this operation.

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