<Ahstract> In recent 20 years, the geochemical processes on the surface or/and near the surface of the earth, especially the chemical circulation of materials between the hydrosphere and the lithosphere have been well documented in terms of the Rb-Sr isotope systematics.

In addition, strontium isotope composition tests have also been conducted, with VG354 solid isotope mass spectrograph, on 25 samples from Zhong 1 and Zhong 4 wells.

We have developed a new method for in situ strontium isotope measurement of fluid inclusion using LA-MC-ICPMS.

At present,the composition and evolution of strontium isotopes in biogenic marine carbonate rocks is an important tool for studying sea level change,orogenic movement and paleoclimate,and plays an important role in the global chronostratigraphic correlation and dating.

To determin e the mineralizat ion time of the deposit using the method of Rb-Sr isotopes,the quartz containi ng fluid inclusions was chosen from the sheetlike.