• 责任者：Wang Kun (Key Laboratory of Mineralogy and Metallogeny ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Xing Changming
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：镁铁质岩 ; mafic rocks ; 钒钛磁铁矿矿床 ; vanadium titano-magnetite deposit ; 四川 ; Sichuan Province
• 页码：p.3503-3518
• 图表：10 illus., 4 tables, 62 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The Panzhihua, Hongge and Baima mafic-ultramafic layered intrusions in Panzhihua-Xichang region host large Fe-Ti-V oxide deposits and are parts of the ～ 260Ma Emeishan large igneous province. Two types of melt inclusions can be identified in apatite from the leucogabbro in the middle zone of Panzhihua intrusion in terms of color： dark and light ones. Dark melt inclusions are dark brown or black in color and range in sizes from 10um to 60um. They commordy behave as circular or negative crystal shapes. Daughter minerals within the dark inelusions include clinopyroxene, hornblende, plagioclase and magnetite. Light inclusions are white or slightly green and range in size from 51xm to 60um. Daughter minerals in the light inclusions include plagioclase, hornblende, elinopyroxene and minor magnetite and Quartz. After being heated to 1080 ～ 1200℃, light inclusions become homogenous glasses. The glasses are Sirich, with an average composition of 69.7% SiO2, 0. 24% TiO2, 14. 5% Al2O3 , 2. 76% FeO, 0. 64% MgO, 5.14% CaO, 2. 82% Na2O, 2. 26% K20 and 0. 25% P205. Dark inclusions are not homogenized after heating. Their averaged compositions that are estimated based on electron probe analysis and mass balance calculation are Fe-rich, with 42.4% SiO2 , 1.43% TiO2, 8. 83% A1203 , 20. 5% FeO, 5.46% MgO, 16. 3% CaO, 1.11% Na2O, 0. 30% K20 and 1.41% P2Os. Coexistence of Fe-rich and Si-rich melt in the apatite of the leucogabbro unit of the Panzhihua intrusion indicates that liquid immiscibility may have occurred in the evolved magmas. Layering of minerals may be contributed to the liquid immiscibility and gravitational differentiation. In this fashion, Fe-rich melts settled down to form the thick Fe-Ti-V oxide ore body and melagabbro in the lower part of the Panzhihua intrusion, whereas Sirich melts move upwards to form the felsic vein, lens and leucogabbro in the upper part.