搜索结果: 1-15 共查到“地质学 temperatures”相关记录23条 . 查询时间(0.093 秒)
Analyzing magma temperatures may help get closer to forecasting volcanic eruptions
temperatures volcanic eruptions
2017/7/21
Although volcanic eruptions are often quite hazardous, scientists have been unable to pinpoint the processes leading up to major eruptions – and one important limitation has been a lack of knowledge a...
The study was led by John Eiler, the Robert P. Sharp Professor of Geology and professor of geochemistry, and Rob Eagle, a former Caltech postdoctoral scholar now at UCLA. A paper descri...
Long-term variations of fumarole temperatures on Vulcano Island (Italy)
temperature fumarole heat release
2015/8/27
Fumarole temperatures are the ultimate results of many processes that are encountered by deep fluids during their passage to the surface. Here, the time variations of high-temperature fumaroles acquir...
Stable isotope compositions of a late Jurassic ammonite shell:a record of seasonal surface water temperatures in the southern hemisphere?
Stable isotope compositions late Jurassic ammonite shell seasonal surface water temperatures
2009/10/22
Exceptional preservation of aragonite secreted by ammonites offers an opportunity to determine the seasonal temperature variations of Mesozoic surface waters. Ontogenetic profiles of carbon and oxygen...
Comparison of Maturation Data and Fluid-inclusion Homogenization Temperatures to Simple Thermal Models:Implications for Thermal History and Fluid Flow in the Midcontinent
Maturation Data Fluid-inclusion Homogenization Temperatures Simple Thermal Models
2009/10/21
Time-temperature index (TTI) modeling is used to establish a simple theoretical thermal maturity for Paleozoic strata in central Kansas. These thermal maturation calculations are based on estimates of...
Shock-compressed MgSiO3 glass, enstatite, olivine, and quartz: Optical emission, temperatures, and melting
enstatite olivine quartz
2014/4/8
Optical emission of MgSiO3 glass, enstatite, olivine, and quartz under shock wave
compression was investigated with optical pyrometry at discrete wavelengths ranging
from visible to near infrared. W...
Local Ca-Mg distribution of Mg-rich pyrope-grossular garnets synthesized at different temperatures revealed by 29Si MAS NMR spectroscopy
Local Ca-Mg distribution Mg-rich pyrope-grossular garnets synthesized different temperatures revealed 29Si MAS NMR spectroscopy
2012/4/1
Pyrope-grossular solid solutions, (Mg,Ca) Al Si O , of composition Py Gr and Py Gr were3 2 3 12 85 15 75 25
synthesized at 1000, 1200, and 1400 ?C and 30 kbars in a piston-cylinder device. The synt...
Energy barriers to viscous flow and the prediction of glass transition temperatures of molten silicates
Energy barriers viscous flow glass transition temperatures molten silicates
2012/3/31
Within the framework of the Adam-Gibbs (configurational entropy) theory of viscosity,it is shown that for a given composition, the ratio of parameters Be
(a temperature inde-pendent constant) to Sc( ...
Complete Fe-Mg solid solution in lithium niobate and perovskite structures in titanates at high pressures and temperatures
Complete Fe-Mg solid solution lithium niobate perovskite structures titanates high pressures temperatures
2012/4/5
Anewhigh-pressureMgTiO phasewiththelithiumniobatestructure(R3c)hasbeen
roveredfromexperimentsat21GPaand1200C.Phaseswiththelithiumniobate
structurewerealsosynthesizedforintermediatecompositionsbetwee...
Mutual exsolution in hornblende and cummingtonite: Compositions, lamellar orientations, and exsolution temperatures
Mutual exsolution hornblende cummingtonite Compositions lamellar orientations exsolution temperatures
2012/4/6
Exsolvedpairsofhornblende and cummingtonite from two localities in southern New England, U.S.A.,have been studied using transmission electron microscopy(TEM) to measurethe crystallographic orientation...
Magnetic properties of the magnetite-spinel solid solution: Curie temperatures, magnetic susceptibilities, and cation ordering
Magnetic properties magnetite-spinel solid solution Curie temperatures magnetic susceptibilities cation ordering
2012/4/5
Curietemperatures (Td ofthe (Fe304)x(MgA1204)1-xsolid solution have been deter-minedfrom measurementsofmagneticsusceptibility (x)vs.temperature. Thetrend in Te
vs.composition extrapolates to 0Katx =0...
The phenomenon of low Al-Si ordering temperatures in aluminosilicate framework structures
phenomenon Al-Si ordering temperatures aluminosilicate framework structures
2012/4/5
The enthalpy ofordering ofAland Sibetween tetrahedral sites in framework structures is now known from several studies to bein the range 0.3-1.4 eVper two Al-O-Si linkages, depending on the structure a...
An in situ Raman spectroscopic study of Na2Si2O5 at high pressures and temperatures: Structures of compressed liquids and glasses
situ Raman spectroscopic study Na2Si2O5 high pressures temperatures Structures glasses
2012/4/5
Raman spectra ofNa2Si20sglassand Na2Si20sliquid have been collected in situ to pressuresof16GPaat300Kand 10GPaat885K.Inglasscompressed at300K,bands
associated withintertetrahedral bridging 0 atoms de...
Formation of Smectite Crystals at High Pressures and Temperatures
High pressure High temperature Smectite Synthesis
2011/12/29
Smectite single crystals of superior quality were synthesized at high pressures and temperatures using a modified belt type high pressure apparatus. Pressure-temperature conditions were established fo...
Development of Ammonium-Saponites from Gels with Variable Ammonium Concentration and Water Content at Low Temperatures
Cation exchange capacity Infrared spectroscopy Saponite Synthesis Thermal analysis Transmission electron microscopy X-ray powder diffraction
2011/12/1
Abstract: Ammonium-saponite is hydrothermally grown at temperatures below 300°C from a gel with an overall composition corresponding to (NH4)0.6Mg3Si3.4Al0.6O10(OH)2. The synthetic saponite and co-exi...