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Experimental metasomatic alteration of titanite in a series of metamorphic fluids at 700 °C and 200 MPa.

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Title: Experimental metasomatic alteration of titanite in a series of metamorphic fluids at 700 °C and 200 MPa.
Authors: Gmochowska, Wiktoria1 (AUTHOR) wiktoria.gmochowska@twarda.pan.pl, Harlov, Daniel2,3,4 (AUTHOR), Słaby, Ewa5 (AUTHOR), Jokubauskas, Petras6 (AUTHOR), Sláma, Jiří7 (AUTHOR), Łącki, Marcin6 (AUTHOR)
Source: Mineralogy & Petrology. Sep2024, Vol. 118 Issue 3, p321-344. 24p.
Subjects: Rare earth metals, Sphene, Metasomatism, Perovskite, Wollastonite, Garnet
Abstract: Seven experiments exploring the reaction of titanite with various hydrothermal solutions have been carried out at 700 °C and 200 MPa for a run duration of 16 days. In experiments involving fluids consisting of NaCl+H2O, KCl+H2O, CaCl2+H2O, 2M NaOH, or 2M KOH, no reaction of the titanite with the fluid was observed other than a slight dissolution of the titanite. Experiments involving NaF+H2O and Ca(OH)2+H2O resulted in visible alteration of the titanite in texture and composition, coupled with the formation of perovskite. In the NaF+H2O experiment, perovskite, enriched with rare earth elements (REE), formed as euhedral to subhedral crystals on the surface of the recrystallized titanite. In the Ca(OH)2+H2O experiment perovskite took in minor amounts of REE, and formed as a reaction rim partially replacing the titanite via a coupled dissolution-reprecipitation reaction. Wollastonite, along with minor calcite, and grossular garnet, formed as an outer rim on the perovskite. In the NaF+H2O experiment major and trace elements were leached from the titanite, whereas in the Ca(OH)2+H2O experiment no leaching of major or trace elements was observed. Nb/Ta, Th/U, and Y/Ho were investigated as potential indicators of hydrothermal processes. While the Nb/Ta ratio was altered in the experimentally metasomatised titanite, the degree of alteration was the same for both fluids. In contrast, only small changes in the Th/U and Y/Ho ratios between the altered and original titanite were seen for either experiment. The formation of perovskite at the expense of titanite in NaF+H2O or Ca(OH)2+H2O fluids demonstrates how titanite reacts with these fluids in simple, low silica activity systems under mid to upper crustal P-T conditions. [ABSTRACT FROM AUTHOR]
Copyright of Mineralogy & Petrology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Experimental metasomatic alteration of titanite in a series of metamorphic fluids at 700 °C and 200 MPa.
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  Data: <searchLink fieldCode="AR" term="%22Gmochowska%2C+Wiktoria%22">Gmochowska, Wiktoria</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wiktoria.gmochowska@twarda.pan.pl</i><br /><searchLink fieldCode="AR" term="%22Harlov%2C+Daniel%22">Harlov, Daniel</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Słaby%2C+Ewa%22">Słaby, Ewa</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jokubauskas%2C+Petras%22">Jokubauskas, Petras</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sláma%2C+Jiří%22">Sláma, Jiří</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Łącki%2C+Marcin%22">Łącki, Marcin</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Mineralogy+%26+Petrology%22">Mineralogy & Petrology</searchLink>. Sep2024, Vol. 118 Issue 3, p321-344. 24p.
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  Data: <searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Sphene%22">Sphene</searchLink><br /><searchLink fieldCode="DE" term="%22Metasomatism%22">Metasomatism</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Wollastonite%22">Wollastonite</searchLink><br /><searchLink fieldCode="DE" term="%22Garnet%22">Garnet</searchLink>
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  Label: Abstract
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  Data: Seven experiments exploring the reaction of titanite with various hydrothermal solutions have been carried out at 700 °C and 200 MPa for a run duration of 16 days. In experiments involving fluids consisting of NaCl+H2O, KCl+H2O, CaCl2+H2O, 2M NaOH, or 2M KOH, no reaction of the titanite with the fluid was observed other than a slight dissolution of the titanite. Experiments involving NaF+H2O and Ca(OH)2+H2O resulted in visible alteration of the titanite in texture and composition, coupled with the formation of perovskite. In the NaF+H2O experiment, perovskite, enriched with rare earth elements (REE), formed as euhedral to subhedral crystals on the surface of the recrystallized titanite. In the Ca(OH)2+H2O experiment perovskite took in minor amounts of REE, and formed as a reaction rim partially replacing the titanite via a coupled dissolution-reprecipitation reaction. Wollastonite, along with minor calcite, and grossular garnet, formed as an outer rim on the perovskite. In the NaF+H2O experiment major and trace elements were leached from the titanite, whereas in the Ca(OH)2+H2O experiment no leaching of major or trace elements was observed. Nb/Ta, Th/U, and Y/Ho were investigated as potential indicators of hydrothermal processes. While the Nb/Ta ratio was altered in the experimentally metasomatised titanite, the degree of alteration was the same for both fluids. In contrast, only small changes in the Th/U and Y/Ho ratios between the altered and original titanite were seen for either experiment. The formation of perovskite at the expense of titanite in NaF+H2O or Ca(OH)2+H2O fluids demonstrates how titanite reacts with these fluids in simple, low silica activity systems under mid to upper crustal P-T conditions. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Mineralogy & Petrology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00710-024-00862-5
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        Text: English
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        PageCount: 24
        StartPage: 321
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      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Sphene
        Type: general
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: Wollastonite
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      – SubjectFull: Garnet
        Type: general
    Titles:
      – TitleFull: Experimental metasomatic alteration of titanite in a series of metamorphic fluids at 700 °C and 200 MPa.
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              M: 09
              Text: Sep2024
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