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《Acta Petrologica Sinica》 1987-03
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OXYGEN, HYDROGEN AND CARBON ISOTOPE STUDIES FOR FANGSHAN GRANITIC INTRUSION

Zhen Sicheng Huang Fusheng Jiang Changyi Zheng Shuhui (Department of Geology, Beijing University)  
Oxygen,hydrogen and carbon stable isotope compomsitions of the rocks, minerals and fluid inclusions from Fangshan granitic intrusion have teen investigated. The narrow range of the δ~(18)O values of whole rock samples from 8.5--10 indicates the identity of source material of the rocks. The differences of δ~(18)O values between the coexisting quartzbiotite, quartz-whole rock which vary from 4.8-5.8 and 1.0--1.4 respectively are consistent with that of the normal granitic intrusion. The isotopic temperatures derived from the oxygen isotopic data of quartz-biotite and quartz-magnetite range from 450--580℃ and the deviation of the isotopic temperatures between these two pairs is within the measuring accuracy. All the results mentioned above demonstrate the existed oxygen isotopic equilibrium in this intrusion.Except for the biotite-adamellite-diorite, the correllation of 6D of coexisting biotite and hornblende is essentially in accord with the equation given by Suzuoki and Epstein (1976). Thus it is proved that the hydrogen isotopic equilibrium was also maintained in the Fang-shan intrusion.The calculated δD value of the fluid equilibrated with the hydrous mineral is -30±7. Considering the lack of water in the magma, the δD value of the magmarie fluid can be estimated as -70---30. The δ~(13)C value of CO_2 in the fluid inclusion ranges from -4---8 indicating a deep-seated origin of carbon.From the isotopic evidences and the geological and petrological informations it can be suggested that the magma of this intrusion was probably derived from the partial melting of the deep-seated metamorphic igneous rocks and the rafractory residue still retained as the granulite facies in the source region.The discrepency between the observed δD values in primary fluid inclusions and those estimated from the hydrous minerals data is interpreted using the different isotope fractionation effect of the "dissolved water" in quartz.The peculiar hydrogen and carbon isotope data of biotite adamellite diorite can be elucidated in terms of the involvment of the meteoric water in the late evoluonti of the magma.
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