Now showing items 81-90 of 192
Application of new thermodynamic data to grossular phase relations
(Springer-Verlag, 1977-01)
Recent low temperature, adiabatic calorimetric heat capacity measurements for grossular have been combined with DSC measurements to give entropies up to 1000 K. In conjunction with enthalpy of solution values for grossular, ...
Strontium, boron, oxygen, and hydrogen isotope geochemistry of brines from basal strata of the Gulf Coast sedimentary basin, USA
(Elsevier, 1993-05)
Significant spatial heterogeneities exist in the stable isotopic composition of saline formation waters from reservoirs of the Smackover Formation (Upper Jurassic). We focused on the southwest Arkansas shelf, a structurally ...
Electrochemical measurements and thermodynamic calculations of redox equilibria in pallasite meteorites: Implications for the eucrite parent body
(Elsevier, 1990-06)
The intrinsic oxygen fugacity (IOF) of olivine separates from the Salta, Springwater, and Eagle Station pallasites was measured between 850 and 1150[deg]C using oxygen-specific solid zirconia electrolytes at 105 Pa. The ...
Characterization of sedimentary humic matter by alkaline hydrolysis
(Elsevier, 1983)
Humic matter fractions from modern sediments of Lake Huron and Lake Michigan have been compared. Large yields of saccharinic acids from alkaline hydrolysis suggest that these fractions contain large portions of carbohydrate ...
Heat capacity and phase equilibria of hollandite polymorph of KAlSi 3 O 8
(Springer-Verlag, 2006-05)
The low-temperature heat capacity ( C p ) of KAlSi 3 O 8 with a hollandite structure was measured over the range of 5–303 K with a physical properties measurement system. The standard entropy of KAlSi 3 O 8 hollandite is ...
Rutile/TiO 2 II phase equilibria
(Springer-Verlag, 2003-05)
The transition between rutile and α-PbO 2 structured TiO 2 (TiO 2 II) has been investigated at 700–1,200 °C and 4.2–9.6 GPa. Hydrothermal phase equilibrium experiments were performed in the multi-anvil apparatus to bracket ...
The stability of sodalite in the system NaAlSiO4-NaCl
(Elsevier, 1989-08)
The reaction SODALITE = [beta]-nepheline + NaCl (s) was reversed in solid-medium apparatus (923 K, 7.6-8.0 kbar; 973 K, 7.4-7.6 kbar; 1073 K, 7.8-8.0 kbar; 1173 K, 8.4-8.6 kbar) and the reaction SODALITE = carnegieite + ...
Stable isotope compositions of fluid inclusions in biogenic carbonates
(Elsevier, 1994-01)
Measurements have been made of hydrogen, carbon, and oxygen isotope compositions of inclusion waters and CO2 extracted from eleven species of modern marine and freshwater skeletal carbonates. The samples were collected in ...
Oxygen isotope variations in granulite-grade iron formations: constraints on oxygen diffusion and retrograde isotopic exchange
(Springer-Verlag, 1988-04)
The oxygen isotope ratios of various minerals were measured in a granulite-grade iron formation in the Wind River Range, Wyoming. Estimates of temperature and pressure for the terrane using well calibrated geothermometers ...
Gas buildup in Lake Nyos, Cameroon: The recharge process and its consequences
(Elsevier, 1993-05)
The gases dissolved in Lake Nyos, Cameroon, were quantified recently (December 1989 and September 1990) by two independent techniques: in-situ measurements using a newly designed probe and laboratory analyses of samples ...