Gas hydrates in CO 2 -bearing fluid inclusions and the use of freezing data for estimation of salinity

HYDROTHERMAL As Bi MINERALIZATION IN THE NAKDONG DEPOSITS, SOUTH KOREA: INSIGHT FROM FLUID INCLUSIONS AND STABLE ISOTOPES

“…Some fluid inclusions in samples of vein quartz have temperatures of clathrate melting above 10.0°C (Fig. 7C), which can be also ascribed to the presence of CH 4 in the fluid inclusions (Collins 1979, Burruss 1981. Neglecting the presence of the CH 4 clathrate, which acts to raise the melting temperature of the clathrate, the corresponding salinities are calculated to be less than 5.5 wt.%.…”

“…7A), and indicates that other gases are present, usually CH 4 or N 2 , which correspond to below 0.1 mole % CH 4 (Higgins 1980, Burruss 1981. Such amounts of other gases would cause little effect on the salinity (Collins 1979). Some fluid inclusions in samples of vein quartz have temperatures of clathrate melting above 10.0°C (Fig.…”

Reconnaissance fluid inclusion study of silver and gold deposits in the Tonopah 1 degree by 2 degrees Quadrangle, Nevada

“…Salinities of (X^-rich inclusions were determined by recording the melting temperature of clathrate coexisting with C02 vapor, liquid C0£, and water. This temperature was then converted to equivalent weight percent NaCl using the relationships of Chen (1972) and Bozzo and others (1975) as discussed in Collins (1979). Predominantly primary inclusions were used in this study, and criteria for determining the origin of inclusions were based on Roedder (1984a).…”

Processos metalogenéticos em ambientes de arco magmático tipo andino, caso de estudo: mineralizações da região dos Andes Patagônicos setentrionais do Chile

“…At this pressure, the concentration of CO 2 dissolved in the liquid phase is 0.85 molal, and can be lower due to the addition of some NaCl quantities. If the CO 2 pressure lies between 10.4 bar (0.85 molal CO 2 ) and about 45 bar (2.2 molal CO 2 ) the clathrate forms with cooling resulting in an increase in the apparent salinity of the remaining liquid, reflected by a decrease in the ice melting point, as also discussed by Collins (1979). Finally, if CO 2 pressure is greater than ~45 bar (concentrations greater than 2.2 molal CO 2 in pure water) the cooling of solutions results in the condensation of a CO 2 liquid phase.…”

“…As moléculas da primeira substância podem constituir uma estrutura cavernosa, no estado sólido, alojando assim os átomos ou moléculas do segundo componente, sendo as forças envolvidas muito fracas (ligações iônicas (Collins, 1979;Diamond, 1992Diamond, , 1994.…”