Mantle-derived CO2 in Hot Springs of the Rehai Geothermal Field,Tengchong, China

Gas concentrations and isotopic compositions of He and CO2 were determined on free gas samples from ten hot springs of the Rehai geothermal field, Tengchong, China. The results showed that hot-spring CO2 gas, together with He,was derived mainly from the mantle, indicating the accumulation of mantle-derived volatiles beneath the survey area. The δ13C values of CO2, higher than those of the typical mantle-derived carbon and the isotopic composition of hot-spring-free CO2 in unequilibrium with dissolved CO2, are recognized only in the Rehai geothermal field, suggesting that there seems to be a still-degassing magmatic intrusion at depths, which provides mantle-derived volatiles to the hydrothermal system above. The accumulation of those volatiles has probably played an important role in triggering earthquakes in this region.In addition, the isotopic characteristics of He and C also indicate that the magmatic intrusion seems to have been derived from the MORB source, and could be contaminated by crustal materials during its upwelling through the continental crust.

作 者： Ren Jianguo WANG Xianbin OUYANG Ziyuan   作者單位： Ren Jianguo(College of Marine Geosciences,Ocean University of China,Qingdao,Shandong 266003)

WANG Xianbin(Lanzhou Institute of Geology,Chinese Academy of Sciences,Lanzhou,Gansu 730000)

OUYANG Ziyuan(Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550002) 

刊 名： 地質學報（英文版）  SCI 英文刊名： ACTA GEOLOGICA SINICA  年，卷(期)： 2005 79(3)  分類號： P5  關鍵詞： Tengchong   hot-spring gas   carbon isotopic composition   CO2/3He   magma degassing  

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