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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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Hebei China
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Tianjin China (1)
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Xinjiang China
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Tarim Basin (1)
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Middle East
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Iran (1)
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Turkey
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Anatolia (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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North America
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Rocky Mountains (1)
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United States
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Montana (1)
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commodities
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brines (1)
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oil and gas fields (1)
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petroleum
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natural gas (2)
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geologic age
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian
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Lodgepole Formation (1)
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Madison Group (1)
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minerals
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oxides
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ilmenite (1)
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silicates
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chain silicates
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pyroxene group
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clinopyroxene (1)
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framework silicates
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silica minerals
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stishovite (1)
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Primary terms
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Asia
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Far East
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China
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Hebei China
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Tianjin China (1)
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Xinjiang China
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Tarim Basin (1)
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-
-
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Middle East
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Iran (1)
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Turkey
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Anatolia (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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brines (1)
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crystal structure (2)
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data processing (9)
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geophysical methods (16)
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hydrology (1)
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metamorphism (1)
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metasomatism (1)
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North America
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Rocky Mountains (1)
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oil and gas fields (1)
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paleoclimatology (1)
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian
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Lodgepole Formation (1)
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Madison Group (1)
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petroleum
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natural gas (2)
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sedimentary rocks
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carbonate rocks
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limestone (1)
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clastic rocks
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argillite (1)
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sedimentary structures
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planar bedding structures
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rhythmic bedding (1)
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sedimentation (1)
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seismology (1)
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spectroscopy (2)
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stratigraphy (2)
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United States
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Montana (1)
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well-logging (2)
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X-ray analysis (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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limestone (1)
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clastic rocks
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argillite (1)
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sedimentary structures
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sedimentary structures
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planar bedding structures
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rhythmic bedding (1)
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maximum entropy analysis
Three-dimensional regularized inversion of DC resistivity data with different stabilizing functionals
A new method for NMR data inversion based on double-parameter regularization
Seismic facies analysis based on speech recognition feature parameters
Inversion of nuclear magnetic resonance echo data based on maximum entropy
A combined Wigner-Ville and maximum entropy method for high-resolution time-frequency analysis of seismic data
Frequency trend attribute analysis for stratigraphic division and correlation
Improving Bayesian maximum entropy and ordinary Kriging methods for estimating precipitations in a large watershed: a new cluster-based approach
Local mineral equilibrium in metamorphism: development of D. Korzhinskii’s ideas (on 110th anniversary of D.S. Korzhinskii)
Single-crystal structure and electron-density analyses of Earth's interior under high-pressure and high-temperature conditions using synchrotron radiation
Crystal structures together with physical properties under nonambient conditions are significant subjects in the effort to understand geophysical phenomena or solid-state physics. Miniature diamond anvil pressure cell (DAC) and multianvil high-pressure apparatus have become effective tools for the observation of pressure effects on crystalline materials, not only for X-ray diffraction measurements but also for physical property studies such as electrical conductivity and magnetism. These high-pressure studies have been made at high temperatures by electric resistance heater or laser and at low temperatures by cryostat. For the last twenty years, synchrotron radiation facilities have accelerated the study of high-pressure crystallography because of their great advantages for diffraction studies at nonambient conditions. Application of synchrotron radiation enhances structure analyses as a function of pressure. Pressure dependence of electron-density distributions around atoms is elucidated by single-crystal diffraction study using deformation electron-density analysis. In this study, compression mechanisms were investigated through structure analyses. The maximum entropy method (MEM) based on the observed structure F obs (hkl) of reflection hkl was applied to reveal an electron-density map, and the results were compared with difference Fourier synthesis based on F obs (hkl) – F calc (hkl). Radial electron distribution revealed the localization or delocalization of electrons around atomic positions together with bonding electron densities. The diffraction intensity measurements of FeTiO 3 ilmenite and γ-SiO 2 stishovite single crystals were made at high pressures. In both cases, the valence electrons became more localized around the cations with increasing pressure. This is consistent with molecular orbital calculations—both methods show that the bonding electron density becomes smaller with pressure. The thermal displacement parameters of both samples were reduced with increasing pressure.