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For over a century the Geological Survey of Western Australia has been accumulating an enormous amount of information on the geology, mineral resources, and petroleum fields of Western Australia, either through the activities of State-employed regional mappers or the submission of mineral and petroleum reports mandated by State legislation. Recognizing the importance of this legacy for future exploration...
Large amounts of vintage seismic data were rescued and disseminated in an internal project of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS). Such types of data would be very difficult to acquire today because they cover many areas that are currently subject to restrictions in obtaining exploration permits. The datasets extend over large geographical areas, covering large...
State geological surveys are home to legacy geological data that holds value in the present. Early legislation of geological surveys often included requirements that state surveys have a museum or cabinet to house their physical collections. These collections currently include data such as cores, cuttings, thin sections and fossils. State geological surveys maintain these collections to support scientific...
In many countries there is a large source of soil survey information that could be used to guide land management decision. This soil information is commonly undervalued and underused, because it is usually not in a user-friendly format that non-soil specialists who generally make land management decisions can readily apply, nor are soil specialists always immediately available to conduct the interpretation...
This study presents bulk-rock major, trace, and platinum-group element data, as well as mineral chemistry for peridotites which form large enclaves (up to 500×1000m) within Mesoarchaean orthogneisses of the Akia terrane in the Fiskefjord region, southern West Greenland. The largest peridotite body, known as Seqi, contains highly fosteritic olivine with a median Mg# of 92.6 and hosts extensive layers...
The freezing temperatures of hundreds of water drops with radii 20–50μm containing known average concentrations of suspended, mostly micron- to submicron-sized, volcanic ash particles composed of SiO2-rich glass were recorded using optical microscopy. As expected, the ash suppresses supercooling, and in contrast to earlier studies of much larger ash particles, the median freezing temperature clearly...
The Curie depth is the depth at which the crust and uppermost mantle cease to be ferromagnetic or ferromagnetic, the main cause of crustal magnetism, due to the action of geothermal effects. One method to estimate the Curie depth for Australia is to map the base of magnetisation derived from observations of magnetic intensity. We have used a nonlinear direct sampling inverse technique to fully explore...
Coccoliths contribute significantly to pelagic sediments formed over the last 200 million years, yet their geochemistry has been largely overlooked as a potential record of palaeoenvironmental information. Recently developed techniques have enabled successful extraction of coccolith-dominated sediment fractions. However, the reliability of palaeoenvironmental interpretations that can be drawn from...
The Pacific Ocean is surrounded by subduction zone systems leading to a decreasing surface area as well as sub-surface mantle domain. In contrast, the Atlantic realm is characterized by passive margins and growing in size. To maintain global mass balance, the Caribbean and the Scotia Sea have been proposed as Pacific-to-Atlantic transfer channels for sub-lithospheric shallow mantle. We concentrate...
We report here on the chemical signature of degassing at Erebus lava lake associated with intermittent explosions and the return to passive conditions. Explosions caused by bubble bursts were frequent during the 2013 field season, providing the first opportunity to observe such activity since 2005–06. Several of the explosions were captured by multiple instruments including an open-path Fourier transform...
This work combines core-flood experiments with X-ray μ-computed tomography (μ-CT) to investigate the swelling of clay minerals and its impact on permeability of unconsolidated porous media. Both swelling (montmorillonite) and non-swelling (kaolinite) clay were added as coatings on soda lime beads and quartz grains. Clay content varied from 1.4 to 5.5wt.% in the montmorillonite-coated samples and from...
We study the influence of non-tidal loading by the Baltic Sea on GNSS daily coordinate time series. The momentary sea surface is estimated from hourly tide gauge recordings around the Baltic and the load is convolved with Green’s functions to determine 3-D deformation, gravity, potential and tilt effects at 193 stations around the Baltic. This paper concentrates on 3-D deformation at a small number...
Outflow channels on Mars reveal the past presence of water, possibly released from pressurized groundwater reservoirs. We aim to improve our understanding of such outflow systems in order to better constrain past hydrological conditions on Mars. We investigate the morphology of possible pressurized groundwater outflow systems on Mars and compare them to landscape evolution experiments. These experiments...
Accurate measurements of volcanic ash morphology are critical to improving both our understanding of fragmentation processes and our ability to predict particle behaviour. In this study, we present new ways to choose and apply shape parameters relevant to volcanic ash characterisation. First, we compare shape measurements from different imaging techniques, including cross-sectional (2-D) and projected...
This study examines gully erosion in northeast Tennessee hillslopes in the Southern Appalachian Valley and Ridge physiographic province, where a thick sequence of red clay Ultisols (Acrisol, according to the World Reference Base for Soil) overlies dolomite and limestone bedrock. The role of freeze-thaw processes in gully erosion was examined weekly from 6/3/2012 to 9/17/2014 using a network of n=78...
The geomorphological analysis of cliff coast stretching to the north of Otranto (southern Apulia, Italy) was integrated by penetrometer tests and geophysical survey aiming to reconstruct its late Holocene evolution. In particular, the study focuses on the inactive cliff of Torre dell'Orso inlet which hosts a 150m - wide beach and a high dune belt. The survey detected the cliff/wave-cut platform junction...
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