U-Pb dating and geochemistry of diorite in the eastern section from eastern Kunlun middle uplifted basement and granitic belt

作者：Li BiLe^*; Sun FengYue; Yu XiaoFei; Qian Ye; Wang Guan; Yang YanQian

来源：Acta Petrologica Sinica, 2012, 28(4): 1163-1172.

• K-rich calc-alkaline intrusion
• Petrogenesis
• Tectonics setting
• U-Pb dating
• Eastern Kunlun middle uplifted basement and granitic belt

Studies of petrology and geochemistry indicate the high-K calc-alkaline diorite groups are located in the eastern section from eastern Kunlun middle uplifted basement and granitic belt. This suite of dioritic rocks are enriched in LILE (such as K, Ba, Rb), LREE and more mobile incompatible elements (such as Th, U) relatively depleting in HESE (such as Nb, Ta, Ti, P), similar to the characteristics of Andean-type active continental margin magma. It is suggested that a mixture, between basaltic magma derived from partial melting of metasomatized mantle and acidic magma derived from crustal material, produces the dioritic magma. LAICP-MS zircon U-Ph dating shows that the diorite in the Asiha intrusions was formed at similar to 244Ma, which in Early lndosinian period.

• 出版日期2012-4
• 单位吉林大学