Experiments on the element distribution between the granodiorite JG-1a and 2M NaCl hydrothermal solution at temperatures of 300 to 800°C and a pressure of 1 kb

Etsuo Uchida, Takuro Haitani, Takayuki Suetsugu, Takahiro Kashima, Ken Tsutsui

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The distribution of Na, K, Ca, Mg, Mn and Fe between the granodiorite JG-1a, one of the geochemical standard rocks, and 2M NaCl aqueous solution was experimentally determined at temperatures of 300 to 800°C and a pressure of 1 kb using standard cold seal-type pressure vessels. The solid run products melted partially at 800°C. Only K shows a significantly different behavior from the experiments using the basalt JB-1a (Uchida and Tsutsui, 2000) due to the presence of orthoclase in the JG-1a. The transition elements tend to be preferably partitioned into the aqueous chloride solutions with increasing temperature. At 800°C and 1 kb, the Fe concentration of the aqueous chloride solutions reached up to 5,000 ppm, and the Mn concentration up to 350 ppm. The distribution coefficient, KD,i = Ci,sol/Ci, rock, is in the order of Na>K≈Mn≈Ca> Fe≈Mg at 300°C, but changed in the order of Mn>N≈K≈Fe>Ca>Mg at 800°C. The distribution coefficients of the divalent cations for the JG-1a are higher than those for the JB-1a. The distribution coefficient of the transition elements, Fe and Mn, increases significantly with increasing temperature. The thermodynamic analysis for aqueous speciation revealed that this is attributable to the formation of the tri-chloro complexes of the transition elements at higher temperatures.

    Original languageEnglish
    Pages (from-to)155-162
    Number of pages8
    JournalResource Geology
    Volume53
    Issue number2
    DOIs
    Publication statusPublished - 2003

    Fingerprint

    Transition Elements
    granodiorite
    transition element
    Chlorides
    experiment
    temperature
    Experiments
    Rocks
    chloride
    Temperature
    orthoclase
    Divalent Cations
    Polymethyl Methacrylate
    Pressure vessels
    rock
    Seals
    vessel
    aqueous solution
    cation
    thermodynamics

    Keywords

    • Aqueous speciation
    • Chloride complex
    • Element partition
    • Granodiorite
    • Hydrothermal solution
    • Supercritical condition

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

    Cite this

    Experiments on the element distribution between the granodiorite JG-1a and 2M NaCl hydrothermal solution at temperatures of 300 to 800°C and a pressure of 1 kb. / Uchida, Etsuo; Haitani, Takuro; Suetsugu, Takayuki; Kashima, Takahiro; Tsutsui, Ken.

    In: Resource Geology, Vol. 53, No. 2, 2003, p. 155-162.

    Research output: Contribution to journalArticle

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    abstract = "The distribution of Na, K, Ca, Mg, Mn and Fe between the granodiorite JG-1a, one of the geochemical standard rocks, and 2M NaCl aqueous solution was experimentally determined at temperatures of 300 to 800°C and a pressure of 1 kb using standard cold seal-type pressure vessels. The solid run products melted partially at 800°C. Only K shows a significantly different behavior from the experiments using the basalt JB-1a (Uchida and Tsutsui, 2000) due to the presence of orthoclase in the JG-1a. The transition elements tend to be preferably partitioned into the aqueous chloride solutions with increasing temperature. At 800°C and 1 kb, the Fe concentration of the aqueous chloride solutions reached up to 5,000 ppm, and the Mn concentration up to 350 ppm. The distribution coefficient, KD,i = Ci,sol/Ci, rock, is in the order of Na>K≈Mn≈Ca> Fe≈Mg at 300°C, but changed in the order of Mn>N≈K≈Fe>Ca>Mg at 800°C. The distribution coefficients of the divalent cations for the JG-1a are higher than those for the JB-1a. The distribution coefficient of the transition elements, Fe and Mn, increases significantly with increasing temperature. The thermodynamic analysis for aqueous speciation revealed that this is attributable to the formation of the tri-chloro complexes of the transition elements at higher temperatures.",
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