Results 91 to 100 of about 105,325 (306)

Clay Mineralogy of Red Clay Deposits from the Central Carpathian Basin (Hungary): Implications for Plio/Pleistocene Chemical Weathering and Paleoclimate [PDF]

, 2013
Geochemical and mineralogical studies of palaeosols provide essential information for palaeoclimatic and palaeoenvironmental interpretation of continental deposits and can present a proxy for palaeoclimate.
Kovács, János, Ottner, Franz, Raucsik, Béla, Varga, Andrea, Varga, György, Újvári, Gábor   +5 more
core  

On the Evolution of Dust Mineralogy, From Protoplanetary Disks to Planetary Systems [PDF]

, 2011
Mineralogical studies of silicate features emitted by dust grains in protoplanetary disks and Solar System bodies can shed light on the progress of planet formation.
Beckwith, Beichman, Blaauw, Bockelée-Morvan, Bouwman, Brown, Bruno Merín, Bryden, Carpenter, Carpenter, Dahm, de Zeeuw, Dullemond, Dzib, Ewine F. van Dishoeck, Fabian, Forrest, Furlan, Gautier, Haisch, Harker, Harker, Hartmann, Hernández, Houck, Isa Oliveira, Jean-Charles Augereau, Johan Olofsson, Juhász, Juhász, Kemper, Kessler-Silacci, Kessler-Silacci, Klaus M. Pontoppidan, Kóspál, Lahuis, Li, Lisse, Luhman, Luhman, Malfait, Mamajek, Megeath, Merín, Merín, Oliveira, Oliveira, Pascucci, Rieke, Sargent, Sicilia-Aguilar, Straizys, Su, Watson, Wooden, Wooden   +55 more
core   +4 more sources

Creep properties and constitutive model of diabase in deep water conveyance tunnels

Deep Underground Science and Engineering, EarlyView.
The axial and lateral creep characteristics of diabase were analyzed based on compression creep tests. The nonlinear viscoelastic‐plastic model capable of describing the whole creep process was established based on the fractional derivative and damage theories.
Zhigang Tao, Pengxiao Guan, Xiaojie Yang, Keyuan Liu, Mingjiu Cai, Hong Yang   +5 more
wiley   +1 more source

X-ray Amorphous Components of Antarctica Dry Valley Soils: Weathering Implications for Mars [PDF]

The Antarctic Dry Valleys (ADV) comprise the largest ice-free region of Antarctica. Precipitation usually occurs as snow, relative humidity is frequently low, and mean annual temperatures are about -20C [1]. Substantial work has focused on soil formation
Graff, T., Ming, D. W., Quinn, J. E.
core   +1 more source

HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?

, 2020
We report here time domain infrared spectroscopy and optical photometry of the HD145263 silica-rich circumstellar disk system taken from 2003 through 2014.
Britt, D. T., Chen, C. H., Jackson, A. P., Johnson, B. C., Lisse, C. M., Lucas, M. D., Marengo, M., Meng, H. Y. A., Morlok, A., Sitko, M. L., Vervack Jr., R. J., Wolk, S. J.   +11 more
core   +1 more source

The fluxing effect of fluorine at magmatic temperatures (600-800 °C): A scanning calorimetric study [PDF]

, 1992
The effect of F on the glass transition behavior of albite, diopside, and four other silicate melts has been investigated using scanning calorimetry. The addition of F to all silicate melts investigated results in a strong, nonlinear decrease of the ...
Dingwell, Donald B., Webb, Sharon L.
core   +1 more source

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source

Study on the Process Mineralogy for the Flotation Tailings of a Gold Mine in Shandong Province

Kuangchan zonghe liyong
This is anarticle in the field of process mineralogy. The grade of gold and sulfur in a gold mine from Shandong Province was 2.0 g/t and 1.56% respectively, which was a typical gold bearing ore with low sulfur.
Kai WU, Yingqiang MA, Hailong WANG, Hongliang DONG, Ruihui REN, Shuxin WANG   +5 more
doaj   +1 more source

Indonesian Tungsten Mineralogy and Processing Concept

E3S Web of Conferences
Tungsten minerals which are major as Wolframite and Scheelite mineral are by-product minerals of Tin mineral known as Cassiterite. Tin minerals are mostly found in Bangka Island which is one of the islands in the Southeast Asian tin belt that makes Indonesia the largest Tin (Sn) producer in the world.
Hutabarat Imelda, Maryono, Rudiyansah, Ramadan Dikri Fajar, Wigyantoro Koko   +4 more
openaire   +2 more sources

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source