In order to study the character of magmatic source materials and pegtrogenetic processes of the highly fractionated granites in Nanling range,the zircon trace elements are analyzed by LA-ICP-MS from the Yanshanian biotite granite in Longyuanba complex,eastern the Nanling range.The results indicate that zircon can be divided into two groups based on its trace element composition:the first group is zircon crystallized in a relatively early stage of magma evolution,without fine-grained inclusions such as apatite.The second group consists of zircons crystallized in a relatively late stage of magma evolution,containing a certain amount of fine-grained inclusions such as apatite.The magma crystallization temperature of the Yanshanian biotite granite in Longyuanba is 667～916 ℃,with an average of 761 ℃;The oxygen fugacity is lg f(O2)=-14.3～-12.5,the relative oxygen fu-gacity(△FMQ)is-1.4～0.3,and the average is-0.2.The magma underwent strong separation and crystalli-zation of minerals such as apatite,sphene,zircon,and plagioclase,ultimately forming a highly differentiated Ⅰ-type biotite granite.
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