Document Detail


Near-infrared spectroscopic determination of salinity and internal pressure of fluid inclusions in minerals.
MedLine Citation:
PMID:  16613640     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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 anti-symmetric 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 microm. 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.
Authors:
Hiroyuki Kagi; Akiko Kiyasu; Tasuku Akagi; Masayuki Nara; Takayuki Sawaki
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied spectroscopy     Volume:  60     ISSN:  0003-7028     ISO Abbreviation:  Appl Spectrosc     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-14     Completed Date:  2006-06-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372406     Medline TA:  Appl Spectrosc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  430-6     Citation Subset:  -    
Affiliation:
Geochemical Laboratory, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan. kagi@eqchem.s.u-tokyo.ac.jp
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