scholarly journals Insights from the PharmaDEEP Expedition to the South Shetland Trench in the sub-Antarctic

2017 ◽  
Author(s):  
H A Stewart ◽  
A J Jamieson
Keyword(s):  
The South ◽  
South Shetland Trench

Chapter 3.2b Bransfield Strait and James Ross Island: petrology

2021 ◽  
pp. M55-2018-37 ◽  
Author(s):  
Karsten M. Haase ◽  
Christoph Beier
Keyword(s):  
Antarctic Peninsula ◽  
South Shetland Island ◽  
The South ◽  
Bransfield Strait ◽  
Geodynamic Processes ◽  
James Ross Island ◽  
South Shetland Trench ◽  
Low Degrees ◽  
Back Arc ◽  
The Antarctic

AbstractYoung volcanic centres of the Bransfield Strait and James Ross Island occur along back-arc extensional structures parallel to the South Shetland island arc. Back-arc extension was caused by slab rollback at the South Shetland Trench during the past 4 myr. The variability of lava compositions along the Bransfield Strait results from varying degrees of mantle depletion and input of a slab component. The mantle underneath the Bransfield Strait is heterogeneous on a scale of approximately tens of kilometres with portions in the mantle wedge not affected by slab fluids. Lavas from James Ross Island east of the Antarctic Peninsula differ in composition from those of the Bransfield Strait in that they are alkaline without evidence for a component from a subducted slab. Alkaline lavas from the volcanic centres east of the Antarctic Peninsula imply variably low degrees of partial melting in the presence of residual garnet, suggesting variable thinning of the lithosphere by extension. Magmas in the Bransfield Strait form by relatively high degrees of melting in the shallow mantle, whereas the magmas some 150 km further east form by low degrees of melting deeper in the mantle, reflecting the diversity of mantle geodynamic processes related to subduction along the South Shetland Trench.

Tectonic Deformation in the Upper Crust and Sediments at the South Shetland Trench

2013 ◽  
pp. 157-166
Author(s):  
Y. Kim ◽  
H.-S. Kim ◽  
R. D. Larter ◽  
A. Camerlenghi ◽  
L. A. P. Gambôa ◽  
...  
Keyword(s):  
Tectonic Deformation ◽  
Upper Crust ◽  
The South ◽  
South Shetland Trench

The transition from an active to a passive margin (SW end of the South Shetland Trench, Antarctic Peninsula)

2003 ◽  
Vol 366 (1-2) ◽  
pp. 55-81 ◽  
Author(s):  
Antonio Jabaloy ◽  
Juán-Carlos Balanyá ◽  
Antonio Barnolas ◽  
Jesús Galindo-Zaldı́var ◽  
F.Javier Hernández-Molina ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Passive Margin ◽  
The South ◽  
South Shetland Trench

Gravity models for the South Shetland Trench and the Shackleton Fracture Zone, Antarctica

1997 ◽  
Vol 1 (2) ◽  
pp. 89-98 ◽  
Author(s):  
Young Keun Jin ◽  
Yeadong Kim ◽  
Sang Heon Nam ◽  
Duk Kee Lee ◽  
Kiehwa Lee
Keyword(s):  
Fracture Zone ◽  
Gravity Models ◽  
The South ◽  
South Shetland Trench ◽  
Shackleton Fracture Zone

Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling

Sedimentology ◽  
1991 ◽  
Vol 38 (4) ◽  
pp. 691-715 ◽  
Author(s):  
SZCZEPAN J. POREBSKI ◽  
DIETER MEISCHNER ◽  
KRZYSZTOF GORLICH
Keyword(s):  
West Antarctica ◽  
The South ◽  
South Shetland Trench ◽  
Facies Modelling

scholarly journals New geological interpretation of multi-channel seismic profiles from the Pacific Margin of the Antarctic Peninsula

2016 ◽  
Vol 37 (2) ◽  
pp. 243-268 ◽  
Author(s):  
Jan Okoń ◽  
Jerzy Giżejewski ◽  
Tomasz Janik
Keyword(s):  
Accretionary Prism ◽  
South Shetland Islands ◽  
The South ◽  
Seismic Profiles ◽  
Geological Interpretation ◽  
Bransfield Strait ◽  
Time Migration ◽  
The Pacific ◽  
Deep Seismic Soundings ◽  
South Shetland Trench

Abstract The Polish Geophysical Expedition to West Antarctica in 1979–1980 was carried out by the Institute of Geophysics, Polish Academy of Sciences. Beside deep seismic soundings, 12 multi-channel seismic profiles, with a total length of ca 1000 km have been recorded north and east of the South Shetland Islands and in the Bransfield Strait, but they have never before been completely interpreted and published. All profiles have been processed with modern processing flow including time migration. Profiles crossing the South Shetland Trench revealed distinct reflector inside continental slope, which has been interpreted as border between buried accretionary prism and overlying slope sediments of glacial-marine origin. Profiles in the Bransfield Strait show traces of the Last Glacial Maximum (LGM) in the form of glacial foreground valleys, with some of them used as weak spots for young age volcanic intrusions. This paper is the first comprehensive geological interpretation of collected dataset and differences between results from other expeditions are discussed.

Seismicity and tectonics around the northern Antarctic Peninsula from King Sejong station data

2000 ◽  
Vol 12 (2) ◽  
pp. 196-204 ◽  
Author(s):  
D.K. Lee ◽  
Y.K. Jin ◽  
Y. Kim ◽  
S.H. Nam
Keyword(s):  
Antarctic Peninsula ◽  
Fracture Zone ◽  
Normal Fault ◽  
The South ◽  
Seismicity And Tectonics ◽  
South Shetland Trench ◽  
Bransfield Basin ◽  
Shackleton Fracture Zone ◽  
The Antarctic ◽  
South Scotia Ridge

Local earthquakes recorded at the King Sejong station (62° 13′31″S, 58° 47′07″W) from 1995–96 have been analysed to study the seismicity and tectonics around the northern Antarctic Peninsula. The nature of shallow-focused normal fault earthquakes along the South Shetland Platform is still unclear. Dominant normal fault earthquakes and minor strike-slip earthquakes in the Eastern Bransfield Basin suggest 1) ongoing extension, and 2) transtensional stress transmitted from the Antarctic–Scotia transform boundaries, the South Scotia Ridge and the Shackleton Fracture Zone. A lack of seismicity in the Central Bransfield Basin supports that active seismicity in the Eastern Bransfield Basin is not a result of subduction along the South Shetland Trench. Shallow focused earthquakes have been observed along the NW–SE trending gravity low line between the Central and the Eastern Bransfield Basins that approximately coincides with the landward projection of a fracture zone in the former Phoenix Plate.

Is subduction ongoing in the South Shetland Trench, Antarctic Peninsula?: new constraints from crustal structures of outer trench wall

2009 ◽  
Vol 13 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Young Keun Jin ◽  
Joohan Lee ◽  
Jong Kuk Hong ◽  
Sang Heon Nam
Keyword(s):  
Antarctic Peninsula ◽  
The South ◽  
Crustal Structures ◽  
South Shetland Trench

Presidential Republicanism in the South, 1960

1962 ◽  
Vol 24 (2) ◽  
pp. 303-322 ◽  
Author(s):  
Bernard Cosman
Keyword(s):  
The South

Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

2000 ◽  
Vol 179 ◽  
pp. 201-204
Author(s):  
Vojtech Rušin ◽  
Milan Minarovjech ◽  
Milan Rybanský
Keyword(s):  
Emission Lines ◽  
High Latitudes ◽  
Green Line ◽  
Solar Cycles ◽  
The South ◽  
Coronal Emission ◽  
Local Maxima ◽  
The North ◽  
Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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