地质学报Issue(8)：1528-1538,11.
西藏雄村斑岩铜金矿集区火山-岩浆岩锆石Hf同位素组成
Zircon Hf Isotopic Composition of Volcanic-Magmatic Rocks at Xiongcun Porphyry Copper-Gold Deposit,Tibet
摘要
Abstract
This paper report the Hf isotope compositions of volcanic-magmatic rocks from Xiongcun Porphyry copper-gold deposit,Tibet.Volcanic-magmatic rocks are divided into two groups based on U-Pb dating and Hf isotope.The first group is early to middle Jurassic volcanic-magmatic rocks:ore-bearing andesitic tuff,pre-mineralization hornblende quartz diorite porphyry,syn-mineralization quartz diorite porphyry, quartz diorite porphyry with bigger quartz eyes,and andesite dyke crosscutting ore-body.The second group is Eocene biotite granodiorite.The first group volcanic-magmatic rocks are characterized by similar depleted Hf isotope composition and young model age.The initial value ofεHf(t)are +13. 76~+17. 50、+12. 24~+18. 79、+14. 39~+17. 64、+12. 50~+16. 26、+10. 66~+15. 44 respectively.The depleted Hf isotope compositions of first group indicate that magmas are derived by partly melting of depleted mantle.At other hand,relatively homogeneous Hf isotope compositions also indicated that the first group magmatisms did not mixed with older continent crust,and are belong to island arc magmas.The initial value ofεHf(t)of second group Eocene biotite granodiorite are +5. 75~+9. 42,which are similar to the same period magma of south Gangdisi belt,which are derived by partly melting of juvenile lower continental crust.关键词
Hf同位数/火山-岩浆岩/斑岩铜金矿床/雄村/冈底斯/西藏Key words
Hf isotope/volcanic-magmatic rocks/porphyry copper-gold deposit, Xiongcun/Gangdese/Tibet引用本文复制引用
黄勇,唐菊兴,张丽,郎兴海..西藏雄村斑岩铜金矿集区火山-岩浆岩锆石Hf同位素组成[J].地质学报,2014,(8):1528-1538,11.基金项目
国家自然科学基金（编号41172077）；西藏大型矿床成矿专属性研究（编号1212011221073）共同资助成果。 （）
