Weathering Processes in the Granitic Strengbach Catchment (North-Eastern France): Laboratory Experiments under Acidic Conditions and Field Assessment Using Sr Isotopes

1998 ◽  
Vol 62A (2) ◽  
pp. 1214-1215
Author(s):  
A. Probst
Keyword(s):  
Laboratory Experiments ◽  
Sr Isotopes ◽  
Weathering Processes ◽  
Field Assessment ◽  
North Eastern ◽  
Acidic Conditions ◽  
Strengbach Catchment

Use of Sr isotopes as a tool to decipher the soil weathering processes in a tropical river catchment, southwestern India

2015 ◽  
Vol 63 ◽  
pp. 498-506 ◽  
Author(s):  
G.P. Gurumurthy ◽  
K. Balakrishna ◽  
M. Tripti ◽  
Jean Riotte ◽  
Stéphane Audry ◽  
...  
Keyword(s):  
Sr Isotopes ◽  
Tropical River ◽  
River Catchment ◽  
Soil Weathering ◽  
Weathering Processes ◽  
Southwestern India

scholarly journals MONITORING OF INTERACTIONS OF A MONUMENTAL HISTORICAL COMPLEX LOCATED ON AN EARTH EMBANKMENT

2014 ◽  
Vol 20 (2) ◽  
pp. 299-307
Author(s):  
Czeslaw Miedzialowski ◽  
Jaroslaw Malesza ◽  
Mikołaj Malesza ◽  
Leonas Ustinovichius
Keyword(s):  
Actual State ◽  
Underground Structures ◽  
Weathering Processes ◽  
The North ◽  
Richter Scale ◽  
North Eastern ◽  
Dynamic Forces ◽  
Earth Embankment ◽  
The Stability ◽  
The Hill

The Camaldolese Monastery was built in the seventeenth-century on a man-made hill raised on a Wigry lake is land in the north-eastern part of Poland. Over the following two hundred years, the Monastery buildings were subjected to destructive weathering processes and underwent significant demolition during the two World Wars. Subsequently, the complex was reconstructed and renewed. All the Monastery buildings were raised on two earth terraces varying in height from 6 to 8 m. The terraces were formed of crushed bricks and stone debris that filled up the underground structures built earlier. The hill is composed of different geotechnical layers and their influence on the stability of the whole hill, displacement and deformation of the buildings have been monitored. The results of the monitoring are presented in the paper. The thickness of backfilled soil layers varies from 1 to 5 m and an assessment of layer parameters is influencing the actual state and future renovation of the Monastery buildings. In 2004, the Monastery buildings were affected by dynamic forces of an earthquake that measured 5.3 on the Richter scale despite the fact that this region had never been subjected to any seismic hazards. As a result, larger than expected deformations of the sub-base caused excessive cracking of the buildings and destruction of existing water and sewage system.

Strontium isotopic composition as tracer of weathering processes, a review with respect to James Ross Island, Antarctica

2012 ◽  
Vol 2 (1) ◽  
pp. 20-30 ◽  
Author(s):  
Jitka Míková
Keyword(s):  
Natural Environments ◽  
Polar Regions ◽  
Sr Isotopes ◽  
Mixing Processes ◽  
Rock Interaction ◽  
Weathering Rates ◽  
Weathering Processes ◽  
James Ross Island ◽  
Flow Pathways ◽  
Geochemical Studies

Strontium isotopes (87Sr/86Sr) are routinely used to determine sources and mixing relationships in geochemical studies. They have proven to be useful in determining weathering processes and quantifying end-member mixing processes. A number of studies highlight that Sr isotopes represent a powerful tool helping to constrain weathering reactions, weathering rates, flow pathways and mixing scenarios, even when inherent differences in weathering rates of different minerals, and mineral heterogeneity in natural environments may cause difficulties in defining the weathering component of different geochemical systems. Nevertheless, Sr isotopes are useful when combined with other chemical data, to constrain models of water–rock interaction and mixing as well as geochemical processes such as weathering. This paper presents basic information about Sr isotopic system, new analytical developments, summary of recent published studies in constraining the weathering processes, and indicates studies similar to weathering in polar regions. The aim of this paper is to present rationale of using Sr isotopes as tracer of weathering processes on James Ross Island, Antarctica.

Biological control of sapstain fungi: From laboratory experiments to field trials 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Holzforschung ◽  
2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Cornelia Gradinger ◽  
Tsilla Boisselet ◽  
Daniel Stratev ◽  
Thomas Ters ◽  
Kurt Messner ◽  
...  
Keyword(s):  
Filamentous Fungi ◽  
Laboratory Experiments ◽  
Field Experiments ◽  
Field Trials ◽  
Pine Wood ◽  
Diplodia Pinea ◽  
Phlebiopsis Gigantea ◽  
North Eastern ◽  
Sphaeropsis Sapinea ◽  
Micro Organisms

Abstract Sapstain fungi, which reduce the value of pine wood, were isolated from an industrial wood yard in north-eastern Germany. The predominant wood discolouring species on the industrial wood yard and in the forests of the investigated region was Sphaeropsis sapinea (syn. Diplodia pinea), but Ophiostoma minus was also found. These fungi were challenged with antagonistic micro-organisms in laboratory trials and in field experiments. Amongst the tested microorganisms only strains of filamentous fungi (Trichoderma sp. and Phlebiopsis gigantea) could control the sapstain fungi on pine wood blocks efficiently. Although P. gigantea was unable to inhibit stain formation completely, the wood was bleached by this fungus in later incubation stages. In two field trials, sapstain on pine wood logs was successfully retarded for a period of 10 and 12 weeks, respectively, with a white sporulating mutant of Trichoderma harzianum. Thus, the concept using filamentous fungi as antagonists against sapstain developed under laboratory conditions also proved to be valid under natural conditions in forest eco-systems.

Radiogenic and stable Sr isotopes constrain weathering processes in rapidly eroding Taiwan catchments

2021 ◽  
Vol 576 ◽  
pp. 117235
Author(s):  
Ni Su ◽  
Shouye Yang ◽  
Kai Deng ◽  
Yuan-Pin Chang ◽  
Juan Xu ◽  
...  
Keyword(s):  
Sr Isotopes ◽  
Weathering Processes

scholarly journals Tungsten Accumulation in Hot Spring Sediments Resulting from Preferred Sorption of Aqueous Polytungstates to Goethite

2021 ◽  
Vol 18 (23) ◽  
pp. 12629
Author(s):  
Qian Zhao ◽  
Qinghai Guo ◽  
Li Luo ◽  
Ketao Yan
Keyword(s):  
Laboratory Experiments ◽  
Natural Waters ◽  
Hot Springs ◽  
Hot Spring ◽  
Geochemical Processes ◽  
Geothermal Systems ◽  
Geothermal Waters ◽  
Acidic Conditions ◽  
Outflow Channel ◽  
Iron Bearing

Geothermal waters usually have elevated tungsten concentrations, making geothermal systems important sources of tungsten in the environment. To study the transport of tungsten in hot springs to hot spring sediment, which is one of the key processes for the release of geothermally derived tungsten to the surface environment, geochemical investigations of the hot springs and their corresponding sediments in Rehai (a representative hydrothermal area in southwestern China) and systematic laboratory experiments of tungstate and polytungstate adsorption onto typical iron-bearing minerals in hot spring sediments (i.e., pyrite and goethite) were conducted. The results demonstrate that considerable tungsten concentrations (i.e., not much less than 10 µg/L), formation of polytungstates under acidic conditions, and enrichment of iron oxide minerals represented by goethite are the prerequisites for extreme enrichment of tungsten in hot spring sediments (e.g., 991 µg/g in the ZZQ spring outflow channel). The absence of any of these conditions would weaken the immobilization of aqueous tungsten and result in higher mobility of tungsten in the hot springs and its further transport downstream, possibly polluting the other natural waters in and around Rehai that serve as local drinking water sources. This study provides an insight for identifying the key geochemical processes controlling the transport and fate of undesirable elements (in this case, tungsten) in geothermal systems.

Covering of cometary nucleus by refractory crust and its evolution into asteroid-like body

1999 ◽  
Vol 173 ◽  
pp. 365-370
Author(s):  
Kh.I. Ibadinov
Keyword(s):  
Laboratory Experiments ◽  
Cometary Nucleus ◽  
Sublimation Rate ◽  
Cometary Nuclei ◽  
Short Period Comet ◽  
Short Period ◽  
Brightness Decrease ◽  
Crust Thickness ◽  
Ice Sublimation ◽  
Period Comet

AbstractFrom the established dependence of the brightness decrease of a short-period comet dependence on the perihelion distance of its orbit it follows that part of the surface of these cometary nuclei gradually covers by a refractory crust. The results of cometary nucleus simulation show that at constant insolation energy the crust thickness is proportional to the square root of the insolation time and the ice sublimation rate is inversely proportional to the crust thickness. From laboratory experiments resulted the thermal regime, the gas productivity of the nucleus, covering of the nucleus by the crust, and the tempo of evolution of a short-period comet into the asteroid-like body studied.

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