• 责任者：Xie Wei (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Song Xieyan
• 刊名：Earth Science Frontiers
• 出版年：2011
• 卷期：18(3)
• 关键词：铜矿 ; copper ores ; 镍矿 ; nickel ores ; 超镁铁质岩 ; ultramafics ; 辉长岩 ; gabbros ; 新疆 ; Xinjiang
• 页码：p.189-200
• 图表：8 illus., 2 tables, 67 refs.
• 分类号：1001
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

The Pobei gabbroic intrusion is located in the Beishan rift zone of the northeastern margin of Tarim Craton. The triangle plots of MnO-TiO₂-P₂O₅ and Th-Hf-Ta show that the parental magmas of the Pobei and Poshi intrusions have features of island arc magma. In contrast, the layered intrusions and mafic-ultramafic dykes in the Bachu area of the Tarim large igneous province (TLIP) show that the intraplate volcanic features. The geochemical features indicate that the parental magmas of the Pobei gabbros and Poshi ultramafic rocks were derived from a metasomatized mantle modified by subduction events, rather than the Tarim mantle. Data of Sr-Nd isotopes show that the magmas of the Pobei and Poshi intrusion underwent 3% to 10% contamination of the Proterozoic metamorphic rocks of the Tarim Craton.