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Geochemistry of K_2O-U-Th Elements of Granites from Eastern China

XU Baoliang;YAN Guohan;ZHAO Hui;ZHANG Zhilong(Department of Geology,Peking Universty,Beijing,100871)  
On the basis of about 350 analytical results of K_2O,Th,U of granites from Jilin,Liaoning,Hebei,Henan,Shandong, Anhui,Jiangxi,Fujian,Hubei and Guangdong province,Eastern China,a general rule of variation of these elements of the granites is summarized,and it is applied to discuss problems of geochemical type ’distributive char- acteristic and petrogenetic significance of the granites。These granites can be divided into three types,e.g.normal,high-U and low-U。A distributive pattern is pointed out that normal and low-U types of granites are dominant in Northern China while normal and high-Utypes are large scale in Southern China。Three metamorphic materials,which are derived from igneous rock,sedimantary rock and weathered igneous rock and/or igneous greywacke of low compositional maturity,are considered respectively as source rocks of the three granites。
【Fund】: 国家自然科学基金和北京大学青年科学基金
【CateGory Index】: P588.121
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