中文摘要：

西藏改则县东窝东铜多金属矿床位于西藏多龙矿集区东部,是近年来班公湖—怒江成矿带上新发现的铜多金属矿。对区内花岗闪长斑岩和花岗斑岩进行了LA-ICP-MS锆石U-Pb年代学测试显示,成岩年龄为（121.0±1.2）Ma和（121.5±1.0）Ma,与多龙矿集区内成岩成矿年龄相近。研究区含矿斑岩显示了富集轻稀土和大离子亲石元素,亏损重稀土和高场强元素,中等Eu负异常,高铝、低镁、低钛,高Sr、低Y及Yb的岛弧岩浆岩特征,暗示矿区含矿岩浆与多龙矿集区含矿岩浆具备相同的岩浆源区。矿区含矿斑岩的锆饱和温度介于779.6~844.5℃,地球化学数据显示高Sr低Nd及低εNd（t）值特征;含矿斑岩εHf（t）为＋3.4~＋11.1,两阶段模式年龄T2DMC为467~963 Ma;表明其与多龙矿区含矿斑岩具备相似的Sr-Nd-Hf同位素特征,暗示了矿区含矿斑岩是班公湖—怒江特提斯洋洋壳向北俯冲消减背景下,由玄武质新生下地壳在较高温度条件下部分熔融形成的产物,指示班公湖—怒江洋盆于早白垩世晚期尚未关闭。野外地质调查发现,矿区发育典型斑岩铜矿蚀变分带;具备与多龙矿集区的岩石组成、矿化及蚀变、成岩成矿时代、构造环境和物质来源相类似的特征,且空间位置相近,暗示两者受控于统一的构造-岩浆成矿系统。综合分析认为,东窝东地区为多龙矿集区东延部分,具有寻找斑岩-浅成低温热液型铜（金）矿床隐伏矿体的良好潜力。

英文摘要：

The Dongwodong copper deposit,located in the east of the Duolong ore-concentrated district,is a newly-discovered porphyry copper deposit in the Bangonghu-Nujiang metallogenic belt in Gerze County,Tibet.Zircon U-Pb dating results show that the granodiorite-porphyries intruded at（ 121. 0 ± 1. 2） Ma and the graniteporphyries intruded at（ 121. 5 ± 1. 0） Ma,which are similar to those of the ore-bearing porphyries from Duolong ore-concentrated area. These porphyries are systematically more enriched in large-ion lithophile elements and LREE,relatively depleted in high strength elements and HREE,and have middle negative Eu anomalies,high Al and Sr,low Mg,Ti,Y and Yb,which are consistent with those of arc-type magmas worldwide. These porphyries have similar ages and geochemical features to those of ore bearing porphyries from Duolong ore-concentrated area,suggesting that they were formed in a common magma chamber. The ore-bearing intrusions are characterized by high TZrranging from 779. 6 to 844. 5 ℃. Additionally,they have varying εHf（ t） values ranging from ＋ 3. 4 to ＋ 11. 1,T2 DMCvalues ranging from 467 to 963 Ma. According to the obtained data,we proposed that the studied porphyries were generated by partial melting of juvenile crust under the background of Bangonghu-Nujiang Tethys oceanic crust subducting northward to Qiangtang massif and the Bangonghu-Nujiang oceanic basin was significant sizes during the Early Cretaceous. Besides,based on field geological surveys,we suggest that this deposit show typical porphyry copper deposit alteration characteristics. Its rock composition,mineralization and alteration,ages of diagenesis and mineralization,and tectonic environment and material source are consistent with those of the deposits in Duolong ore-concentrated area. Comprehensive analysis indicates that Dongwodong copper deposit shares a great potential to discover super-large epithermal-porphyry Cu（ Au,Ag） concealed ore body.