Near-infrared spectroscopic determination of salinity and internal pressure of fluid inclusions in minerals

Hiroyuki Kagi, Akiko Kiyasu, Tasuku Akagi, Masayuki Nara, Takayuki Sawaki

研究成果: ジャーナルへの寄稿記事

9 引用 (Scopus)

抄録

A near-infrared (NIR) spectroscopic method is proposed to achieve the simultaneous determination of salinity and internal pressure of fluid inclusions in natural minerals. A combination band between the antisymmetric stretching and bending vibrations of molecular water at approximately 5180 cm-1 was observed for standard salt solutions and natural minerals containing fluid inclusions with known salinities. A curve-fitting procedure was used to analyze the change in the band shape of the combination. Justification of the calibration was confirmed by observation of fluid inclusions in natural minerals whose salinities had already been determined using microthermometry. The detection limit of the present method is 1 NaCl-eq wt. %. The minimum size of fluid inclusions that produced well-resolved spectra was approximately 30 μm. This method was applied to assess micro fluid inclusions in a natural diamond with cubic growth habit (cuboid). The salinity and residual pressure of those fluid inclusions were estimated respectively as 4.4 wt. % NaCl-eq and 0.6-0.8 GPa. The present method is complementary to Raman microscopy and microthermometry for the determination of salinity in fluid inclusions of geological samples.

元の言語英語
ページ(範囲)430-436
ページ数7
ジャーナルApplied Spectroscopy
60
発行部数4
DOI
出版物ステータス出版済み - 4 1 2006
外部発表Yes

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internal pressure
salinity
Minerals
minerals
inclusions
Infrared radiation
Fluids
fluids
Diamond
bending vibration
habits
curve fitting
Curve fitting
Stretching
Diamonds
Microscopic examination
Salts
diamonds
Calibration
salts

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Spectroscopy

これを引用

Near-infrared spectroscopic determination of salinity and internal pressure of fluid inclusions in minerals. / Kagi, Hiroyuki; Kiyasu, Akiko; Akagi, Tasuku; Nara, Masayuki; Sawaki, Takayuki.

:: Applied Spectroscopy, 巻 60, 番号 4, 01.04.2006, p. 430-436.

研究成果: ジャーナルへの寄稿記事

Kagi, Hiroyuki ; Kiyasu, Akiko ; Akagi, Tasuku ; Nara, Masayuki ; Sawaki, Takayuki. / Near-infrared spectroscopic determination of salinity and internal pressure of fluid inclusions in minerals. :: Applied Spectroscopy. 2006 ; 巻 60, 番号 4. pp. 430-436.
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abstract = "A near-infrared (NIR) spectroscopic method is proposed to achieve the simultaneous determination of salinity and internal pressure of fluid inclusions in natural minerals. A combination band between the antisymmetric stretching and bending vibrations of molecular water at approximately 5180 cm-1 was observed for standard salt solutions and natural minerals containing fluid inclusions with known salinities. A curve-fitting procedure was used to analyze the change in the band shape of the combination. Justification of the calibration was confirmed by observation of fluid inclusions in natural minerals whose salinities had already been determined using microthermometry. The detection limit of the present method is 1 NaCl-eq wt. {\%}. The minimum size of fluid inclusions that produced well-resolved spectra was approximately 30 μm. This method was applied to assess micro fluid inclusions in a natural diamond with cubic growth habit (cuboid). The salinity and residual pressure of those fluid inclusions were estimated respectively as 4.4 wt. {\%} NaCl-eq and 0.6-0.8 GPa. The present method is complementary to Raman microscopy and microthermometry for the determination of salinity in fluid inclusions of geological samples.",
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AU - Kiyasu, Akiko

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AU - Nara, Masayuki

AU - Sawaki, Takayuki

PY - 2006/4/1

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N2 - A near-infrared (NIR) spectroscopic method is proposed to achieve the simultaneous determination of salinity and internal pressure of fluid inclusions in natural minerals. A combination band between the antisymmetric stretching and bending vibrations of molecular water at approximately 5180 cm-1 was observed for standard salt solutions and natural minerals containing fluid inclusions with known salinities. A curve-fitting procedure was used to analyze the change in the band shape of the combination. Justification of the calibration was confirmed by observation of fluid inclusions in natural minerals whose salinities had already been determined using microthermometry. The detection limit of the present method is 1 NaCl-eq wt. %. The minimum size of fluid inclusions that produced well-resolved spectra was approximately 30 μm. This method was applied to assess micro fluid inclusions in a natural diamond with cubic growth habit (cuboid). The salinity and residual pressure of those fluid inclusions were estimated respectively as 4.4 wt. % NaCl-eq and 0.6-0.8 GPa. The present method is complementary to Raman microscopy and microthermometry for the determination of salinity in fluid inclusions of geological samples.

AB - A near-infrared (NIR) spectroscopic method is proposed to achieve the simultaneous determination of salinity and internal pressure of fluid inclusions in natural minerals. A combination band between the antisymmetric stretching and bending vibrations of molecular water at approximately 5180 cm-1 was observed for standard salt solutions and natural minerals containing fluid inclusions with known salinities. A curve-fitting procedure was used to analyze the change in the band shape of the combination. Justification of the calibration was confirmed by observation of fluid inclusions in natural minerals whose salinities had already been determined using microthermometry. The detection limit of the present method is 1 NaCl-eq wt. %. The minimum size of fluid inclusions that produced well-resolved spectra was approximately 30 μm. This method was applied to assess micro fluid inclusions in a natural diamond with cubic growth habit (cuboid). The salinity and residual pressure of those fluid inclusions were estimated respectively as 4.4 wt. % NaCl-eq and 0.6-0.8 GPa. The present method is complementary to Raman microscopy and microthermometry for the determination of salinity in fluid inclusions of geological samples.

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