Marine palynostratigraphy and new species from the Cape Roberts drill-holes, Victoria land basin, Antarctica

2016 ◽  
Vol 126 ◽  
pp. 65-84 ◽  
Author(s):  
Christopher D. Clowes ◽  
Michael J. Hannah ◽  
Graeme J. Wilson ◽  
John H. Wrenn
Keyword(s):  
New Species ◽  
Victoria Land ◽  
Victoria Land Basin ◽  
Drill Holes

Environmental magnetic record of Antarctic palaeoclimate from Eocene/Oligocene glaciomarine sediments, Victoria Land Basin

1998 ◽  
Vol 134 (3) ◽  
pp. 653-662 ◽  
Author(s):  
Leonardo Sagnotti ◽  
Fabio Florindo ◽  
Kenneth L. Verosub ◽  
Gary S. Wilson ◽  
Andrew P. Roberts
Keyword(s):  
Victoria Land ◽  
Magnetic Record ◽  
Victoria Land Basin ◽  
Glaciomarine Sediments

Clay mineral assemblages as indicators of hydrothermalism in the basal part of the CRP-3 core (Victoria Land Basin, Antarctica)

Clay Minerals ◽  
2009 ◽  
Vol 44 (3) ◽  
pp. 389-404 ◽  
Author(s):  
M. Setti ◽  
L. Marinoni ◽  
A. Lopez-Galindo
Keyword(s):  
Electron Microscopy ◽  
Clay Minerals ◽  
Clay Mineral ◽  
Particle Morphology ◽  
Victoria Land ◽  
Mineral Assemblages ◽  
Variable Chemical ◽  
Victoria Land Basin ◽  
Glaciogenic Sediments ◽  
Glaciomarine Sediments

AbstractThe CRP-3 drilling project collected sediments from 3 to 939 mbsf (metres below sea floor) in the Victoria Land Basin in Antarctica. The upper sequence (down to ~790 m bsf) is of Cenozoic age and made up of detrital glaciogenic sediments; the characteristics of clay minerals in this part have been reported elsewhere. Here, the compositional features of clay minerals in the lower sequence such as conglomerates, Devonian sandstones and dolerites are described and genetic processes clarified. Clay minerals in the deepest part of the sequence derive from the alteration of different lithologies that mostly make up the sedimentary basin.Two clay mineral assemblages were characterized through analysis by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). From 790 to 823 mbsf, samples consist of authigenic smectite of variable chemical composition forming imbricated texture of plates or flakes. The smectites probably result from hydrothermal/diagenetic transformation of earlier minerals. The primary smectite cement underwent reorganization during shearing and cataclasis. The lowest part of the sequence (below 823 mbsf) is characterized by an assemblage of kaolinite, mixed-layer illite-smectite, Fe oxyhydroxide, sporadic smectite and poorly crystallized illite. It reflects a stronger alteration process than that recorded in the upper units of core CRP-3, related to hydrothermalism connected with the intrusion of an igneous body. Both assemblages show clear differences in particle morphology, texture and smectite composition to the clay assemblages found in the Cenozoic glaciomarine sediments in the upper sequence. The different phases of alteration appear related to the processes of rifting, exhumation and faulting that characterized this region since the Mesozoic.

scholarly journals A rich fauna of subterranean short-range endemic Anillini (Coleoptera, Carabidae, Trechinae) from semi-arid regions of Western Australia

ZooKeys ◽  
2021 ◽  
Vol 1044 ◽  
pp. 269-337
Author(s):  
Pier Mauro Giachino ◽  
Stefan Eberhard ◽  
Giulia Perina
Keyword(s):  
New Species ◽  
Leaf Litter ◽  
Western Australia ◽  
Short Range ◽  
Mineral Exploration ◽  
Great Majority ◽  
New Genera ◽  
Eastern Australia ◽  
Drill Holes ◽  
Semi Arid

Globally, the great majority of Anillini species are endogean, adapted to live in the interstices of soil and leaf litter, while the extremely low vagility of these minute ground beetles gives rise to numerous shortrange endemic species. Until recently the Australian Anillini fauna was known only from leaf litter in rain forests and eucalypt forests in the wetter, forested regions of eastern and south eastern Australia, as well as Lord Howe and Norfolk islands. The first hypogean Anillini in Australia (17 species in six genera) were described in 2016 from mineral exploration drill holes in iron-ore bearing rocks of the Pilbara region in Western Australia, representing the first finding of the tribe deep underground in a semi-arid climate region. A further eight new genera and 20 new species are described herein, mostly from the Pilbara region as well as the semi-arid Kimberley and Goldfields regions; all were collected in mineral exploration drill holes. The following new genera are described: Erwinanillusgen. nov., Gregorydytesgen. nov., Pilbaraphanusgen. nov., Neoillaphanusgen. nov., Kimberleytyphlusgen. nov., Gilesdytesgen. nov., Pilbaradytesgen. nov., and Bylibaraphanusgen. nov. The following new species are described: Erwinanillus baehrisp. nov.; Gracilanillus hirsutussp. nov., G. pannawonicanussp. nov.; Gregorydytes ophthalmianussp. nov.; Pilbaraphanus chichesterianussp. nov., P. bilybarianussp. nov.; Magnanillus firetalianussp. nov., M. sabaesp. nov., M. salomonissp. nov., M. regalissp. nov., M. serenitatissp. nov.; Neoillaphanus callawanussp. nov.; Kimberleytyphlus carrboydianussp. nov.; Austranillus jinayrianussp. nov.; Gilesdytes pardooanussp. nov., G. ethelianussp. nov.; Pilbaradytes abydosianussp. nov., P. webberianussp. nov.; Bylibaraphanus cundalinianussp. nov.; and Angustanillus armatussp. nov. Identification keys are provided for all Australian anilline genera, and Western Australian species. All the described species are known from a single locality and qualify as short-range endemics. The Anillini are recognised as a significant and diverse element making up part of Western Australia’s remarkable subterranean fauna, and whose conservation may potentially be impacted by mining developments.

Mid-Cenozoic record of glaciation and sea-level change on the margin of the Victoria Land basin, Antarctica

Geology ◽  
1987 ◽  
Vol 15 (7) ◽  
pp. 634 ◽  
Author(s):  
P. J. Barrett ◽  
D. P. Elston ◽  
D. M. Harwood ◽  
B. C. McKelvey ◽  
P.-N. Webb
Keyword(s):  
Sea Level ◽  
Sea Level Change ◽  
Level Change ◽  
Victoria Land ◽  
Victoria Land Basin ◽  
And Sea Level

Modelled composition of cryogenically produced subglacial brines, Antarctica

2019 ◽  
Vol 31 (3) ◽  
pp. 165-166 ◽  
Author(s):  
Christopher B. Gardner ◽  
W. Berry Lyons
Keyword(s):  
Dry Valleys ◽  
Important Process ◽  
Antarctic Ice Sheet ◽  
Lake Vostok ◽  
Hydrologic Systems ◽  
Victoria Land ◽  
Flow Through ◽  
Victoria Land Basin ◽  
Subglacial Meltwater ◽  
Permafrost Regions

Polar subglacial hydrologic systems have garnered much interest since the recognition of Lake Vostok in 1996. In Antarctica, these environments are hydrologically diverse, including isolated lakes of different sizes, river–lake flow-through systems, “swamps” and groundwater (Siegert 2016). The refreezing of subglacial meltwater is also an important process beneath a large portion of the East Antarctic Ice Sheet (Bell et al. 2011). As subglacial water refreezes it exsolves salts, potentially leaving behind saline and hypersaline brines. Brines thought to derive from this cryoconcentration process have been observed in the northern polar permafrost regions and in the McMurdo Dry Valleys (MDVs) region of Antarctica. Additionally, sediments in the Victoria Land Basin have diagenetic signatures produced by brine movement dating from 3–11 m.y.a, suggesting hypersaline brines have existed in the McMurdo region since at least this time (Staudigel et al. 2018).

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