• 责任者：Wang Fuming (Faculty of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Liao Qun’an
• 刊名：Geological Bulletin of China
• 出版年：2013
• 卷期：32(10)
• 关键词：火山岩 ; volcanic rocks ; 铀—铅计时 ; U-Pb dating ; 新疆 ; Xinjiang
• 页码：p.1584-1595
• 图表：12 illus., 4 tables, 45 refs.
• 分类号：0801
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

     The Early Carboniferous volcanic rocks in Dishuiquan area are distributed in southern Kalamalli ophiolite belt on the eastern margin of the Junggar Basin. The volcanic rocks are mainly composed of basalts, basaltic andesites, andesite and andesitic breccia lava, be- longing to alkaline series and tholeiite series. The LA-ICP-MS zircon U-Pb ages of the volcanic rocks are （336.6±3.7）Ma-（338.3±5.2）Ma, indicating that they were formed in early Carboniferous. These volcanic rocks are enriched in LILE and KEE （（La/Yb）N = 3.3-8.5）, de- pleted in Nb and Ta slightly, with relatively low Isr （0.70354-43.70411） and positive εNd（t） （＋4.9-＋6.6）. They were probably derived from a continental mantle wedge source metasomatized by dehydration fluids produced by a snbducted slab. Geochemical features indicate that volcanic rocks were formed in an intraplate environment and produced in the post-collisional extensional period. These volcanic rocks suggest that post-collision magrnatic activity had already begun at least in the Early Carboniferous in the eastern margin of the Junggar Basin. The captured ancient zircons in volcanic rocks indicate the presence of the old basement in eastemJunggar Basin.