Estimating depth of the source of hydrothermal solutions from thermobarometric data

AbstractCoiraite, ideally (Pb,Sn2+)12.5As3Fe2+Sn4+S28, occurs as an economically important tin ore in the large Ag-Sn-Zn polymetallic Pirquitas deposit, Jujuy Province, NW-Argentina. The new mineral species is the As derivative of franckeite and belongs to the cylindrite group of complex Pb sulphosalts with incommensurate composite-layered structures. It is a primary mineral, frequently found in colloform textures, and formed from hydrothermal solutions at low temperature. Associated minerals are franckeite, cylindrite, pyrite-marcasite, as well as minor amounts of hocartite, Ag-rich rhodostannite. arsenopyrite and galena. Laminae of coiraite consist of extremely thin bent platy crystals up to 50 urn long. Electron microprobe analysis (n = 31) gave an empirical formula Pb11.21As2.99Ag0.13Fe1.10Sn6.13S28.0 close to the ideal formula (Pb11.3Sn2+1.2)Σ=12.5As3Fe2+Sn4+S28. Coiraite has two monoclinic sub-cells, Q (pseudotetragonal) and H (pseudohexagonal). Q: a 5.84(1) Å, b 5.86(1) Å, c 17.32(1) Å, β 94.14(1)°, F 590.05(3) Å3, Z = 4, a:b:c = 0.997:1:2.955; H (orthogonal setting): a 6.28(1) Å, b 3.66(1) Å, c 17.33(1) Å, β 91.46(1)°, V398.01(6) Å3, Z = 2, a∶b∶c = 1.716∶1∶4.735. The strongest Debye-Scherrer camera X-ray powder-diffraction lines [d in Å, (I), (hkl)] are: 5.78, (20), (Q and H 003); 4.34, (40), (Q 004); 3.46, (30), (Q and H 005); 3.339, (20), (Q 104); 2.876, (100), (Q and H 006); 2.068, (60), (Q 220).

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X-ray absorption spectroscopic studies of halide ion hydration in hydrothermal solutions

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2006.06.1061 ◽

2006 ◽

Vol 70 (18) ◽

pp. A573 ◽

Cited By ~ 1

Author(s):

T.M. Seward ◽

C.M.B. Henderson ◽

O.M. Suleimenov ◽

J.M. Charnock

Keyword(s):

Spectroscopic Studies ◽

Hydrothermal Solutions ◽

Ion Hydration ◽

X Ray ◽

X Ray Absorption

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Organic acids in hydrothermal solutions; standard molal thermodynamic properties of carboxylic acids and estimates of dissociation constants at high temperatures and pressures

American Journal of Science ◽

10.2475/ajs.295.5.496 ◽

1995 ◽

Vol 295 (5) ◽

pp. 496-580 ◽

Cited By ~ 136

Author(s):

E. L. Shock

Keyword(s):

Thermodynamic Properties ◽

Organic Acids ◽

Carboxylic Acids ◽

High Temperatures ◽

Dissociation Constants ◽

Hydrothermal Solutions

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Epigenetic changes of acidic volcanites from the top of the Western Siberia Pre-Jurassic complex

Moscow University Bulletin. Series 4. Geology ◽

10.33623/0579-9406-2019-3-35-43 ◽

2019 ◽

pp. 35-43

Author(s):

A. V. Krasnova ◽

Yu. V. Rostovtseva ◽

A. E. Gavrilov

Keyword(s):

Low Temperature ◽

Western Siberia ◽

Hydrothermal Solutions ◽

Epigenetic Changes ◽

Reservoir Properties ◽

Tomsk Region

The study of secondary changes of acidic effusives with reservoir properties from the top of the Western Siberia pre-Jurassic complex (Tomsk Region) was produced. Lithological, petrographic and mineralogical features of these rocks indicate their change by low-temperature hydrothermal solutions, while weathering products, which are widely spread at the top of the basement, have not been clearly defined. Reservoir properties of studied rocks were formed probably due to fracturing and leaching.

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Mercury concentrations in thermal waters of the Bolshoi Semyachik hydrothermal system, Russia, Kamchatka.

10.5194/egusphere-egu21-15094 ◽

2021 ◽

Author(s):

Anton Nuzhdaev

Keyword(s):

Hydrothermal System ◽

Kamchatka Peninsula ◽

Hydrothermal Systems ◽

Thermal Waters ◽

Hydrothermal Solutions ◽

Average Value ◽

Thermal Fields ◽

Gas Jets ◽

First Time ◽

Hydrothermal Fields

The study of mercury receipt within volcanic activity zones and large hydrothermal systems recently causes the big interest connected with attempts of an estimation of volumes of natural mercury receipt on a daily surface.The hydrothermal system connected with volcanic massif Big Semyachik is one of the largest on the territory of Kamchatka peninsula. On the surface, the hydrothermal system is manifested by three large hydrothermal fields - the Verhnee Field, the parychay Dolina, and the Northern Crater of the Central Semyachik, the heat export from which is estimated at 300 MW (Vakin, 1976). On the surface of the thermal fields hot thermal waters and powerful steam-gas jets are unloaded.&#160; At the same time, due to the inaccessibility of thermal fields remain poorly studied, and in particular, there is no information on the concentrations of mercury in hydrothermal solutions.During fieldwork in 2020 all types of thermal waters were sampled, chemical types of waters were established, concentrations of mercury in hydrothermal solutions: for hot thermal waters the average value of mercury was - 0.44 mcg / L, and in steam-gas jets - the average value of mercury was - 4.60 mcg / L.Thus, in the course of the work the data on concentrations of mercury in hydrothermal solutions of one of the largest hydrothermal systems of Kamchatka were received for the first time.&#160;

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Geochemistry of hydrothermal solutions from 9°50′ N at the East Pacific Rise (EPR) within twelve years after the eruption of a submarine volcano

Geochemistry International ◽

10.1134/s0016702906070068 ◽

2006 ◽

Vol 44 (7) ◽

pp. 690-703 ◽

Cited By ~ 4

Author(s):

A. Yu. Lein ◽

Ya. A. Bogdanov ◽

D. V. Grichuk ◽

I. I. Rusanov ◽

A. M. Sagalevich

Keyword(s):

East Pacific Rise ◽

Hydrothermal Solutions ◽

Submarine Volcano ◽

East Pacific

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Experimental study of the stability of aluminate-borate complexes in hydrothermal solutions 1 1Associate editor: L. G. Benning

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2003.08.018 ◽

2004 ◽

Vol 68 (6) ◽

pp. 1333-1345 ◽

Cited By ~ 22

Author(s):

Boris Tagirov ◽

Jacques Schott ◽

Jean-Claude Harrichoury ◽

Jocelyne Escalier

Keyword(s):

Experimental Study ◽

Hydrothermal Solutions ◽

Borate Complexes ◽

The Stability

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Experimental Investigation of Hydrous Pyrolysis of Diesel Fuel and the Effect of Pyrolysis Products on Performance of the Candidate Nuclear Waste Repository at Yucca Mountain

MRS Proceedings ◽

10.1557/proc-333-841 ◽

1993 ◽

Vol 333 ◽

Author(s):

Kenneth J. Jackson ◽

Susan A. Carroll

Keyword(s):

Experimental Investigation ◽

Nuclear Waste ◽

Diesel Fuel ◽

Yucca Mountain ◽

Nuclear Waste Repository ◽

Hydrothermal Solutions ◽

Pyrolysis Products ◽

Analytical Technique ◽

Hydrous Pyrolysis ◽

Waste Repository

It is thought that a significant amount of diesel fuel and other hydrocarbon-rich phases may remain inside the candidate nuclear waste repository at Yucca Mountain after construction and subsequent emplacement of radioactive waste. Although the proposed repository horizon is above the water table, the remnant hydrocarbon phases may react with hydrothermal solutions generated by high temperature conditions that will prevail for a period of time in the repository. The preliminary experimental results of this study show that diesel fuel hydrous pyrolysis is minimal at 200°C and 70 bars. The composition of the diesel fuel remained constant throughout the experiment and the concentration of carboxylic acids in the aqueous phases was only slightly above the detection limit (1–2 ppm) of the analytical technique.

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