...) incorporated into apatite and elucidate incorporation mechanisms. One S(-I) species (disulfide, S 2 2 − ) and two S(-II) species (bisulfide, HS − , and sulfide, S 2− ) are investigated as possible forms of reduced S species in apatite. In configuration models for the simulation, these reduced S species...

... complexes in most acidic, shallow hydrothermal systems; while bisulfide complexes become increasingly important in deep, pH neutral to basic hydrothermal systems. We used in situ X-ray absorption spectroscopy (XAS) diamond-anvil cell experiments to determine Zn(II) speciation in a 1 m NaHS + 0.2 m HCl...

... be removed before gas can be combusted. A solution that contains 0.5–1 M sodium bicarbonate at pH 8.2–9, conditions reminiscent of alkaline soda lakes, effectively absorbs H 2 S from gas streams ( Sorokin et al. 2013 ). At high pH, H 2 S gas reacts with OH − to produce bisulfide (HS − ). This is the first...

... deposition, reducing a H 2 S and destabilizing the bisulfide complexes of Au and Cu. The Onaman occurrences provide an uncommon example of a mesothermal system in which pH was relatively low, and the correspondingly low solubility of copper allowed the fluid to saturate with and deposit chalcopyrite. In most...

... in the Calculations Compound Status Sources and modifications       Aqueous species     Zn(OH)(HS) (aqueous) 1 Bourcier and Barnes (1987) extrapolated below 100°C assuming log K versus temperature similar to the other bisulfide complexes of Zn and Pb; Zn(OH)(HS) (aqueous...

... used without further treatment. A microdosimeter was used to titrate excess iodine against sodium thiosulfate. * E-mail: [email protected] © 2014 The Mineralogical Society 2014 P1Freely available online through the publisher-supported open access option. sulfide interference...

... the beam in the vertical plane, while the second focuses it in the horizontal plane. As(III) chloride and bisulfide complexes may be important in some hydrothermal systems, but these complexes remain poorly constrained. Wilkin et al. (2003) and Beak et al. (2008) show that As(III) speciation...

... and proton-bisulfide ion containing water clusters. Eigen-type [H 3 O] + [OH] − (H 2 O) 47 cluster with a surface proton and near-surface hydroxide ion pair (left) : [H 5 O 2 ] + [OH] − (H 2 O) 46 cluster containing a solvent-separated Zundel proton–hydroxide ion pair (center) and a proton-bisulfide...

... SF ( 2000 ) Characteristics and genesis of epithermal gold deposits . Reviews in Economic Geology 13 : 221 - 244 Dilles JH , Farmer GL , Field CW ( 1995 ) Sodium-calcium alteration by non-magmatic saline fluids in porphyry copper deposits: Results from Yerington, Nevada...

..., 1998 ). Powdered samples were also submitted to XRAL Laboratories in Don Mills (Ontario) for whole-rock geochemical analysis by inductively coupled plasma-emission spectroscopy (ICP-ES) using a sodium peroxide fusion/multi-acid dissolution technique (HF-perchloric); as well, Hg, Se, and Te were...

..., bisulfide (HS − ) complexes are also invoked to explain metal solubilities in hydrothermal ore-forming solutions ( Hayashi et al. 1990 ). Unfortunately, there is much less data for gas- and aqueous-phase bisulfide complexes of metals. Table 6 gives some comparison between calculated and experimental bond...

... the destabilization of bisulfide complexes and characterized the change of mineral stabilities from arsenopyrite – pyrite – sphalerite to bismuthinite – native bismuth assemblages. Abstract Dans le gisement à As–Bi de Nakdong, en Corée du Sud, des séquences sédimentaires d’âge cambro-ordovicien sont recoupées...

... are found in freshwater and seawater, respectively). Also sodium chloride and calcium chloride are routinely used for snow and ice control on roadways. Elevated chloride concentrations have been reported during snowmelt conditions ( Howard & Hayes 1997 ). Chloride is a highly soluble and mobile ion...

.... log[ X ] shows significant curvature when successive formation constants can be determined. The metal-bisulfide system ( Luther et al. 1996 , 2000 ) meets these requirements, as do other metal-ligand systems ( El-Maali et al. 1989 ). Values for β′ m are then obtained by fitting R in Equation...

.... Thioacetamide is stable at room temperature, but it decomposes above 100 °C and releases H 2 S. The solution pH at the reaction temperature was buffered by the HS − /H 2 S(aq) buffer. To better constrain the pH, we added sodium acetate (0.14 m) and acetic acid (0.059 m) to shift the HS − /H 2 S(aq) buffer...

... and barite in the giant Anarraaq Zn deposit in the Red Dog district, Alaska (USA), also formed via carbonate replacement. Sodium-chloride brines with different pH and concentrations of Zn, Pb, Ba, Ca, and Mg were reacted with native sulfur with and without carbonate (calcite or dolomite) crystals...

...}^{2{\mbox{--}}}\) \end{document} ) were analyzed by Ion Chromatograph with a 4-mm Dionex IonPac AS14A column using an isocratic sodium carbonate/bicarbonate eluent (at 1.5 ml/min). Trace metals were analyzed by ICP-MS (VG PlamsaQuad 3), operated in peak jumping mode. All standards, blanks...

... deposition resulted from pyritization of the host rocks and oxidation of the mineralizing fluid, which reduced a H 2 S and caused destabilization of gold bisulfide species, leading to precipitation of native gold. The Malartic gold district is situated in the southeastern Superior Province...

... by microthermometry and Raman-microprobe analyses, do not vary in a systematic manner on the deposit scale, although the CH 4 : CO 2 ratio varied across a large range. These observations indicate that gold deposition at Mount Charlotte occurred by desulfidation of bisulfide complexes due to reaction with Fe-rich...

...., 2023 ]. The high water, sulfur, and chlorine contents in adakite melts also favor formation of chloride, bisulfide, and hydroxyl complexes with chalcophile metals. The latter enrich hydrothermal fluids exsolved from adakitic magmas in the upper crust, which are capable of forming porphyry...