Magnetostratigraphic chronology of a late Eocene to early Miocene glacimarine succession from the Victoria Land Basin, Ross Sea, Antarctica

2005 ◽  
Vol 45 (1-3) ◽  
pp. 207-236 ◽  
Author(s):  
Fabio Florindo ◽  
Gary S. Wilson ◽  
Andrew P. Roberts ◽  
Leonardo Sagnotti ◽  
Kenneth L. Verosub
Keyword(s):  
Ross Sea ◽  
Late Eocene ◽  
Early Miocene ◽  
Victoria Land ◽  
Victoria Land Basin

Mineralogical and geochemical characteristics (major, minor, trace elements and REE) of detrital and authigenic clay minerals in a Cenozoic sequence from Ross Sea, Antarctica

Clay Minerals ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 405-421 ◽  
Author(s):  
M. Setti ◽  
L. Marinoni ◽  
A. López-Galindo
Keyword(s):  
Trace Elements ◽  
Clay Minerals ◽  
Ross Sea ◽  
Clay Fraction ◽  
Geochemical Characteristics ◽  
Victoria Land ◽  
Victoria Land Basin ◽  
Degree Of Crystallization ◽  
Mixed Layers

AbstractThe mineralogy and geochemistry of the clay fraction of Victoria Land Basin (Ross Sea, Antarctica) sediments was investigated, to determine the origin of clay minerals and the features of authigenic smectite. The investigated core (CRP-3) is ~800 m long, mostly of Oligocene age. The clay fraction of the upper sequence consists of mica, chlorite and detrital smectite, while that of the central and lower part is largely made up of authigenic smectite. Authigenic smectites are ditrioctahedral, with a composition close to saponite, while detrital smectites such as Al-Fe beidellites are dioctahedral. Authigenic smectites have no illite mixed layers, show a higher degree of crystallization, higher MgO, Fe2O3, V, Cr, Co, Ni and Sc contents and lower SiO2, Al2O3, K2O, TiO2, Ba, Rb and Zr contents with respect to detrital clay minerals, and a clear depletion of LREE with respect to HREE. Authigenic smectite formed from the alteration of volcanic materials and clay minerals.

Geology of the Margin of the Victoria Land Basin off Cape Roberts, Southwest Ross Sea

2013 ◽  
pp. 183-207 ◽  
Author(s):  
P. J. Barrett ◽  
S. A. Henrys ◽  
L. R. Bartek ◽  
G. Brancolini ◽  
M. Busetti ◽  
...  
Keyword(s):  
Ross Sea ◽  
Victoria Land ◽  
Victoria Land Basin

scholarly journals Magnetostratigraphic Chronology of a Cenozoic Sequence From DSDP Site 274, Ross Sea, Antarctica

2020 ◽  
Vol 8 ◽  
Author(s):  
Luigi Jovane ◽  
Fabio Florindo ◽  
Gary Wilson ◽  
Stephanie de Almeida Pecchiai Saldanha Leone ◽  
Muhammad Bin Hassan ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Ross Sea ◽  
Sediment Accumulation ◽  
Late Eocene ◽  
Early Miocene ◽  
Accumulation Rates ◽  
Age Model ◽  
Circumpolar Current ◽  
Geomagnetic Polarity ◽  
Geomagnetic Polarity Time Scale

New paleomagnetic results from the late Eocene-Middle Miocene samples from Deep Sea Drilling Project Site 274, cored during Leg 28 on the continental rise off Victoria Land, Ross Sea, provide a chronostratigraphic framework for an existing paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Based on this new age model, the cored late Eocene-Middle Miocene sequence covers an interval of almost 20 Myr (from ∼35 to ∼15 Ma). Biostratigraphic constraints allow a number of possible correlations with the Geomagnetic Polarity Time Scale. Regardless of correlation, average interval sediment accumulation rates above 260 mbsf are ∼6 cm/kyr with the record punctuated by a number of unconformities. Below 260 mbsf (across the Eocene/Oligocene boundary) interval, sedimentation accumulation rates are closer to ∼1 cm/kyr. A major unconformity identified at ∼180 mbsf represents at least 9 Myr accounting for the late Oligocene and Early Miocene and represent non-deposition and/or erosion due to intensification of Antarctic Circumpolar Current activity. Significant fluctuations in grain size and magnetic properties observed above the unconformity at 180 mbsf, in the Early Miocene portion of this sedimentary record, reflect cyclical behavior in glacial advance and retreat from the continent. Similar glacial cyclicity has already been identified in other Miocene sequences recovered in drill cores from the Antarctic margin.

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