• 责任者：Wang Fenlian (Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Zhao Taiping
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：正长岩 ; syenites ; 铪同位素 ; hafnium isotopes ; 四川 ; Sichuan Province
• 页码：p.3519-3532
• 图表：7 illus., 2 tables, 38 refs.
• 分类号：0801
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     Both Nb-Ta-Zr-bearing and Nb-Ta-Zr-barren syenitic dikes of the Luku and Baicao ore districts in the Panxi region （SW China） are spatially associated with basalts, gabbreic and felsic （granitic and syenitic） intrusions of the ～260Ma Emeishan large igneous province （ELIP）. The syenitic plutons, barren and mineralized dikes at Luku were dated to be 255.6 ± 2. OMa, 255. 6 ± 1.5Ma and 256. 7 ±4. 4Ma, respectively. The syenitic pluton and mineralized dikes at Baicao were dated to be 257. 9 ± 2. 3Ma and 257. 8 ± 1.3Ma, respectively. These age data indicated that the Nb-Ta-Zr mineralization hosted in the syenitic dikes are part of the ELIP. Mineralized dikes at Euku and Baicao have zircon εnf （t） values ranging mostly from ＋ 2 to ＋ 6 and -0. 2 ～ ＋ 7.7, comparable to those of the spatially closely associated syenitic plutons （ ＋ 1.0 ～ ＋ 6. 6 in Luku and ＋ 2. 1 ～ ＋ 6. 2 in Baicao）, implying that the mineralized dikes may have evolved from the syenitic magma. This is important for regional exploration of Nb-Ta-Zr deposits. We consider that the syenitic plutons and dikes may be the products of partial melting of underplated mafic cumulates.