Crustal Composition of China Continent Constrained from Heat Flow Data and Heliu

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Crustal Composition of China Continent Constrained from Heat Flow Data and Helium Isotope Ratio of Underground Fluid

Based on conservation of energy principle and heat flow data in China continent, the upper limit of 1.3 μW/m~3 heat production is obtained for continental crust in China. Furthermore, using the data of heat flow and helium isotope ratio of underground fluid, the heat productions of different tectonic units in China continent are estimated in range of 0.58-1.12 μW/m~3 with a median of 0.85 μW/m~3. Accordingly, the contents of U, Th and K_2O in China crust are in ranges of 0.83-1.76 μg/g,3.16-6.69 μg/g, and 1.0%-2.12%, respectively. These results indicate that the abundance of radioactive elements in the crust of China continent is much higher than that of Archean crust; and this fact implies China's continental crust is much evolved in chemical composition. Meanwhile, significant lateral variation of crustal composition is also exhibited among different tectonic units in China continent. The crust of eastern China is much enriched in incompatible elements such as U, Th and K than that of western China; and the crust of orogenic belts is more enriched than that of platform regions. It can also be inferred that the crusts of eastern China and orogenic belts are much felsic than those of western China and platform regions, respectively, derived from the positive correlation between the heat production and SiO_2 content of bulk crust. This deduction is consistent with the results derived from the crustal seismic velocity data in China. According to the facts of the lower seismic velocity of China than the average value of global crust, and the higher heat production of China continent compared with global crust composition models published by previous studies, it is deduced that the average composition models of global continent crust by Rudnick and Fountain (1995), Rudnick and Gao (2003), Weaver and Tarney (1984), Shaw et ai. (1986), and Wedepohl (1995) overestimate the abundance of incompatible elements such as U, Th and K of continental crust.水利论文ce:j*lU

作 者: WANG Yang SUN Zhiming  
作者单位:WANG Yang(State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;School of Earth Science and Resources, China University of Geosciences, Beiji)
Rh-B,b0`)q"Hm|3| E0SUN Zhiming(School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China) 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2010 84(1) 
分类号:P5 
关键词:crustal composition of continent   heat flow   helium isotope ratio   China continent  
机标关键词:Underground FluidIsotope RatioDataHeat FlowChina continentcontinental crusttectonic unitswestern Chinaeastern Chinaelementscrustal compositionheat flowdifferentunderground fluidvelocity ofenergy principleresultsisotope ratiodataupper limit 
基金项目:This research was supported by the National NaturalScience Foundation of China 
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