Melting behavior of fluid inclusions in laboratory-grown halite crystals in the systems NaClH2O, NaClKClH2O, NaClMgCl2H2O, and NaClCaCl2H2O

Davis, D.; Lowenstein, Tim K.; Spencer, Ronald J.

doi:10.1016/0016-7037(90)90355-o

Cited by 335 publications

(197 citation statements)

References 12 publications

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“…La presencia de estos cationes en cantidades importantes es más que improbable, tal y como se ha demostrado mediante la realización de análisis completos de las inclusiones fl uidas mediante el método de crush-leach. La explicación más probable para las temperaturas tan bajas obtenidas durante la primera fusión radica en la presencia de fenómenos de metaestabilidad (Davis et al, 1990), o bien por un aumento del tamaño de grano del hielo en condiciones subsólidus, a medida que el hielo amorfo va recristalizando a hidratos de sal estequiométricos (Wilkinson, 2001). La primera fusión claramente observada suele aparecer alrededor de -50 a -55 ºC, correspondiendo al eutéctico estable del sistema NaCl-CaCl 2 -H 2 O.…”

Section: Mvt Sensu Strictounclassified

Depósitos de Pb-Zn-Cu-Ba-F-Sr epigenéticos estratoligados en series sedimentarias en relación con salmueras de cuenca: depósitos de tipo “Mississippi Valley” (MVT) y similares en México

Tritlla¹,

Levresse²,

Corona-Esquivel³

et al. 2006

BSGM

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ResumenLos depósitos de Pb-Zn-Cu-Ba-F-Sr epigenéticos estratoligados en series sedimentarias han constituido una de las mayores fuentes de metales en la historia de la humanidad. Aún en la actualidad continuan siendo un objetivo prioritario de exploración para las compañias mineras, debido tanto a su fácil metalurgia como a los grandes tonelajes que presentan los distritos clasifi cados bajo esta tipología.En México existen todo un conjunto de mineralizaciones de Pb-Zn-Ba-F que han sido sistemáticamente consideradas como pertenecientes a tipologías diversas (skarns, reemplazamientos de alta temperatura, epitermales, etc.) que, bajo una nueva pespectiva, responden a un modelo de circulación de fl uidos de cuenca enriquecidos en metales, fl úor y bario durante su tránsito por la serie sedimentaria. Estos fl uidos han dado lugar a un conjunto de cuerpos mineralizados estratoligados que aparecen encajonados dentro de las series de plataforma carbonatada mesozoicas del centro, N y NE de México. Típicamente, no están asociados genéticamente a magmatismo alguno, no causan una alteración muy acusada en la roca encajonante, suelen estar asociados a la presencia de materia orgánica (hidrocarburos líquidos, bitúmen), presentan una mineralogía muy sencilla, a menudo casi monominerálica (barita, celestina, fl uorita, esfalerita, galena) y suelen presentar temperaturas de formación dentro del rango de 90-150 °C con salinidades variables. Todo este conjunto de características hacen a estos depósitos plenamente comparables con los MVT del subtipo Alpino-Apalachiano.En este artículo se lleva a cabo una revisión sobre el conocimiento que se tiene sobre este tipo de depósitos a nivel global para, después, pasar a discutir la presencia de esta tipología en suelo mexicano y sus características geológicas y geoquímicas más relevantes.Palabras clave: Depósitos de tipo MVT, generalidades, geoquímica, depósitos en México, estado del arte. AbstractThe low temperature, epigenetic and stratabound Pb-Zn-Cu-Ba-F-Sr-bearing ore deposits enclosed within sedimentary series have been one of the major sources of metals in history. Presently, exploration companies still fi nd these deposits

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Section: Mvt Sensu Strictounclassified

Depósitos de Pb-Zn-Cu-Ba-F-Sr epigenéticos estratoligados en series sedimentarias en relación con salmueras de cuenca: depósitos de tipo “Mississippi Valley” (MVT) y similares en México

Tritlla¹,

Levresse²,

Corona-Esquivel³

et al. 2006

BSGM

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“…The liquid-rich inclusions commonly occur as clusters in the individual domains, or are randomly distributed in the core of quartz crystals. The inclusions are divided into two types on the basis of whether they begin to melt below or above the temperature of the NaCl-H 2 O eutectic, -21.2°C (Davis et al 1990). They are designated as type IA and type IB, respectively.…”

Section: Petrography Of Fluid Inclusionsmentioning

confidence: 99%

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

Shin¹,

Park²,

Lee³

et al. 2004

The Canadian Mineralogist

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At the Nakdong As-Bi deposits, South Korea, Cambro-Ordovician sedimentary sequences are cut by numerous dykes of quartz monzodiorite and porphyritic granite. In the deposit, stage I involves arsenic mineralization, chiefly associated with arsenopyrite, pyrite, sphalerite and chalcopyrite, whereas bismuth mineralization characterizes stage II, with the coprecipitation of pyrrhotite, chalcopyrite, galena, bismuth, bismuthinite, cosalite, matildite, schirmerite, Au-Ag alloy, and argentite. The mineralization was initiated with the introduction of heterogeneous fluids of high salinity, presumably owing to the prominence of Ca, Mg, Na and K. At stage II, fluid immiscibility, which led to bismuth mineralization, produced (halite ± sylvite)-bearing highsalinity fluids of 27.6 to 49.3 wt.% NaCl equivalents, as well as low-salinity vapor-rich fluids. The homogenization temperatures of mineralizing fluids decreased only slightly from stage I, 283-416°C, to stage II, 222-395°C. A decrease in 18 O as well as 13 C in going from calcite in fresh limestone (␦ 18 O in the range +17.5 to +22.4‰, ␦ 13C in the range +2.3 to +4.4‰) to silicified limestone (␦ 18 O in the range +13.3 to +18.3‰, ␦ 13 C in the range -2.5 to +1.3‰) were promoted not only by Rayleigh volatilization, but also by fluid-rock interaction, with the influx of magmatic fluids into carbonate rocks during the mineralization process. The fluid-rock interaction contributed to the CO 2 and CH 4 components in type-III fluids and also to the Ca-enrichment in type-I fluid inclusions. The prevailing species of sulfur in the mineralizing fluids is estimated to have been H 2 S. The ␦ 34S H2S values obtained from the sulfide minerals increased from stage I, +3.2 to +4.4‰, to stage II, +4.1 to +4.8‰, values typical of magmatic sulfur, and the temperatures of homogenization of fluid inclusions increased as well. The decrease of sulfur fugacities, from 10 -9.1 -10 -6.4 atm at stage I to 10 -15.7 -10 -9.2 atm at stage II, through sulfide precipitation and H 2 S loss, induced the destabilization of bisulfide complexes and characterized the change of mineral stabilities from arsenopyrite -pyrite -sphalerite to bismuthinite -native bismuth assemblages.

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“…10A). Borizenko, 1978) and Mg (MgCl 2 -H 2 O, Te = -33.6 ºC; Borizenko, 1978;Crawford, 1981), although only hematite and no Mg-bearing minerals were observed in the Davis et al, 1990) the presence of this element in the system is suggested for the Te minimum. In fact, the measurement of the Te minimum probably are lower as the small size of the fluid inclusion makes it difficult to observe the exact value of this parameter, and the presence of Ca has been suggested for Te lower than -40.0 ºC by Goldstein and Reynolds (1994) and Roedder (1984).…”

Section: Las Juntas Prospectmentioning

confidence: 99%

“…In fact, the measurement of the Te minimum probably are lower as the small size of the fluid inclusion makes it difficult to observe the exact value of this parameter, and the presence of Ca has been suggested for Te lower than -40.0 ºC by Goldstein and Reynolds (1994) and Roedder (1984). The maximum Te near -30 ºC can indicate an aqueous system with Na and possibly K. The NaCl-H 2 O system has stable eutectic at -20.8 °C (Crawford, 1981), but Davis et al (1990) show metaestable values at -28.0 ºC and observed Te around -21.1 °C and varing from -28.0 to -35 °C. The presence of K also can not be discarded, as the system H 2 O-NaCl-KCl presents a stable eutectic at -22.9 °C (Crawford, 1981), and a metaestable value at -28 °C (Davis et al, 1990).…”

Section: Las Juntas Prospectmentioning

confidence: 99%

“…The maximum Te near -30 ºC can indicate an aqueous system with Na and possibly K. The NaCl-H 2 O system has stable eutectic at -20.8 °C (Crawford, 1981), but Davis et al (1990) show metaestable values at -28.0 ºC and observed Te around -21.1 °C and varing from -28.0 to -35 °C. The presence of K also can not be discarded, as the system H 2 O-NaCl-KCl presents a stable eutectic at -22.9 °C (Crawford, 1981), and a metaestable value at -28 °C (Davis et al, 1990). Therefore, the Na and possibly K can be present in the aqueous solution.…”

Section: Las Juntas Prospectmentioning

confidence: 99%

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

Oyarzo¹,

Leeming²

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Melting behavior of fluid inclusions in laboratory-grown halite crystals in the systems NaClH2O, NaClKClH2O, NaClMgCl2H2O, and NaClCaCl2H2O

Cited by 335 publications

References 12 publications

Depósitos de Pb-Zn-Cu-Ba-F-Sr epigenéticos estratoligados en series sedimentarias en relación con salmueras de cuenca: depósitos de tipo “Mississippi Valley” (MVT) y similares en México

Depósitos de Pb-Zn-Cu-Ba-F-Sr epigenéticos estratoligados en series sedimentarias en relación con salmueras de cuenca: depósitos de tipo “Mississippi Valley” (MVT) y similares en México

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

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

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