The invention discloses a method for accurately measuring a nano
ion probe
olivine Mg
isotope micro-region and applying a moon sample, particularly relates to application of a nano
ion probe (SIMS) technology in
magnesium isotope analysis, and particularly relates to a method for carrying out high-resolution and high-precision
magnesium isotope analysis and on-line matrix effect correction by utilizing a nano
ion probe (NanoSIMS). The method comprises the following steps: (1) synthesizing an
olivine reference substance with a coverage Fo value (
magnesium-iron ratio) range of 0-90 by using a high-temperature and high-pressure experimental method, and verifying composition uniformity and isotope stability of the
olivine reference substance through an
electron probe (EMPA) and a multi-receiving
inductively coupled plasma mass spectrometry (MC-ICP-MS); (2) optimizing NanoSIMS instrument parameters, and realizing
synchronous detection of 24Mg < + >, 26Mg < + >, 28Si < + > and 56Fe < + > through a static multi-collection mode; (3) based on the ratio of 24Mg / (24Mg + 56Fe), proposing a biphase Hill equation to correct the matrix effect, and realizing online correction; and (4) analyzing the geological sample by using the method, and revealing the chemical and isotope change characteristics of the
micron scale. The method has
high resolution (1 [mu] m) and high precision (0.4 per thousand to 0.6 per thousand), and is suitable for micro-area
isotope analysis in the fields of planetary science and
geochemistry.