Stability of CO2 clathrate hydrate + CO2 liquid + CO2 vapour + aqueous KCl-NaCl solutions: Experimental determination and application to salinity estimates of fluid inclusions ∗

Diamond, Larryn W.

doi:10.1016/0016-7037(92)90132-3

Cited by 194 publications

(100 citation statements)

References 14 publications

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“…The actual salinity for these inclusions may be higher due to the effect of methane content on the clathrate melting temperatures, because increasing X CH4 in the system H 2 O-CO 2 -CH 4 makes CO 2 -CH 4 clathrate hydrate melt at a temperature higher than pure CO 2 clathrate (10°C), while the addition of an NaCl component to the system should lower Tm(clath) values (Diamond, 1992). That aspect also explains why most of type IIB2 inclusions have Tm(clath) above 10°C.…”

Section: Microthermometric Resultsmentioning

confidence: 99%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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Microthermometric and stable isotope studies of fluid inclusions were conducted for the Poongjeon talc deposit which formed as alteration products of calc-silicate minerals during the retrograde stage of contact metamorphism related to the intrusion of the Cretaceous Muamsa Granite of South Korea. Two types of quartz vein are observed in the deposit. Vein I, which occurs in marble, is characterized by both mixing and unmixing process of fluid inclusions. Repeated boiling of carbonic fluids produced high X CO2 fluids abundantly and low X CO2 or aqueous fluids a little. Occasionally mixing took place between halite ± sylvite-bearing fluids and carbonic fluids. As for vein II, which occurs typically at points of amphibolite-metapelite contact, the fluid mixing model can be applied to the coexistence of abundant CH 4 ± H 2 O, H 2 O-CO 2 -CH 4 fluids with variable CH 4 /CO 2 ratios (X CH4 > 0.1), and minor high X CO2 fluid inclusions. The CH 4 -rich inclusions seem to be derived from the reheating of C-bearing metapelite during contact metamorphism.Occurrences of halite ± sylvite-bearing inclusions along trails in both vein I and II are chronologically behind other primary inclusions and are closely related to the talc mineralization. The mineralizing fluids would have been derived directly from a water-saturated crystallizing melt and the entrapment occurred between 150 and 700 bars at 260°-390°C. The δ 13 C CO2 values, 0.1-2.4‰, of inclusion fluids of vein I seem to have resulted from the isotopic exchange of magmatic carbon with 13 C-enriched CO 2 liberated from the decarbonation for calc-silicate formation. Distinctly lower δ 13 C CO2 values, -3.5 to -1.7‰, in vein II could have originated from the strong effect of metasediment-derived fluids. Higher δ 18 O H2O values of vein I and lower δD values of vein II, both of which belong to the magmatic water range, seem to have similar evolution history as δ 13 C values. Geologic structures such as faults and contacts between different rock units seem to have promoted infiltration, mixing, and unmixing of fluids of diverse origins.

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Section: Microthermometric Resultsmentioning

confidence: 99%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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“…Clathrate of this type melted at 8 to 10 °C, indicating salinities of aqueous phases of about 0 to 4 wt% NaCl eq. (Diamond, 1992). Freezing temperatures of aqueous phases could not be measured due to clathrate existence.…”

Section: Geological Setting and Occurrence Of Quartz Veinsmentioning

confidence: 99%

Nahcolite in fluid inclusions from the Ryoke metamorphic rocks and its implication for fluid genesis

Hoshino

Nagatomi²,

Watanabe

et al. 2006

Journal of Mineralogical and Petrological Sciences

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Nahcolite (NaHCO 3 ) has been found in fluid inclusions in quartz veins hosted by the Ryoke metamorphic rocks in Kasado Jima (Island), Yamaguchi Prefecture, Japan. The inclusions are classified into three types: type 1 containing vapor +/− liquid of the H 2 O NaCl CO 2 CH 4 system, type 2 of H 2 O NaCl fluids and type 3 with nahcolite solid. Salinities of the nahcolite bearing fluids are lower than 4 wt% NaCl eq. Extremely large volume fractions of nahcolite solids, occupying more than 50% of total inclusion volume, and various fluid compositions are indicative of their origin as accidentally trapped ones while the fluids were immiscible below the nahcolite melting temperature (270 °C). A thermodynamic calculation of the nahcolite stability and a phase analysis of the fluids show loga Na + = 7.4 -pH as the minimum activity at P = 100 MPa and T = 270 °C where the neutral pH = 5.6. Hence, it can be concluded that the original (prior to immiscible state) liquids might have contained high Na + and low Cl − yielded by an interaction of a low salinity fluid and Na bearing minerals such as plagioclase in the host metamorphic rocks below the fractures now occupied by quartz if nahcolite precipitated from boiling fluids.

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“…The range of T m -clathrate values of type II inclusions is 4.2 to 9.4°C (type IIa, 7.3-9.4°C; type IIb, 4.2-8.5°C). These T m -clathrate values correspond to salinities of 1.2 to 10.3 wt% equivalent NaCl (Diamond, 1992) (Fig. 9).…”

Section: Genesis and Age Constraints On The Daerae Aumentioning

confidence: 84%

“…The T h -total and T h -CO 2 data have standard errors of ±1.0°C, whereas T m -CO 2 , T m -ice and T mclathrate values have errors of ±0.2°C. Salinity data are based on T m -clathrate values for liquid CO 2 -bearing inclusions (Diamond, 1992), and on freezing point depression (denoted as T m -ice) in the H 2 O-NaCl system for dominantly aqueous inclusions (Bodnar, 1993).…”

Section: Fluid Inclusionsmentioning

confidence: 99%

Genesis and Age Constraints on Gold Deposits of the Daerae Mine, Sangju Area, Central‐Northern Sobaegsan Massif, Korea

Yun¹,

Youm²,

So³

et al. 2001

Resource Geology

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Gold mineralization of the Daerae mine represents the first recognized example of the Jurassic gold mineralization in the Sangju area, Korea. It occurs as a single stage of quartz veins that fill fault fractures in Precambrian gneiss of the centralnorthern Sobaegsan Massif. The mineralogical characteristics of quartz veins, such as the simple mineralogy and relatively gold-rich (65-72 atomic % Au) nature of electrum, as well as the CO 2 -rich and low salinity nature of fluid inclusions, are consistent with the 'mesothermal-type' gold deposits previously recognized in the Youngdong area (about 50 km southwest of the Sangju area). Ore fluids were evolved mainly through CO 2 immiscibility at temperatures between about 250 and 325 °C. Vein sulfides characteristically have negative sulfur isotopic values (-1.9 to +0.2 ‰), which have been very rarely reported in South Korea, and possibly indicate the derivation of sulfur from an ilmenite-series granite melt. The calculated O and H isotopic compositions of hydrothermal fluids at Daerae (δ 18 O water = +5.2 to +5.9 ‰; δD water = -59 to -67 ‰) are very similar to those from the Youngdong area, and indicate the important role of magmatic water in gold mineralization.The 40 Ar-39 Ar age dating of a pure alteration sericite sample yields a high-temperature plateau age of 188.3 ± 0.1 Ma, indicating an early Jurassic age for the gold mineralization at Daerae. The lower temperature Ar-Ar plateau defines an age of 158.4 ± 2.0 Ma (middle Jurassic), interpreted as reset by a subsequent thermal effect after quartz vein formation. The younger plateau age is the same as the previously reported K-Ar ages (145-171 Ma) for the other 'mesothermal-type' gold deposits in the Youngdong and Jungwon areas, Korea, which are too young in view of the new Jurassic Ar-Ar plateau age (around 188 Ma).

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Stability of CO2 clathrate hydrate + CO2 liquid + CO2 vapour + aqueous KCl-NaCl solutions: Experimental determination and application to salinity estimates of fluid inclusions ∗

Cited by 194 publications

References 14 publications

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Nahcolite in fluid inclusions from the Ryoke metamorphic rocks and its implication for fluid genesis

Genesis and Age Constraints on Gold Deposits of the Daerae Mine, Sangju Area, Central‐Northern Sobaegsan Massif, Korea

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