Implications of Compositions of Plagioclase and Olivine on the Formation of the Panzhihua V-Ti Magnetite Deposit, Sichuan Province
详细信息
- 责任者：Zhang Xiaoqi (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Zhang Jiafei
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(12)
- 关键词：钒钛磁铁矿矿床 ; vanadium titano-magnetite deposit ; 四川 ; Sichuan Province
- 页码：p.3675-3688
- 图表：9 illus., 2 tables, 38 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Mineral assemblages and associated textures in the low and middle part of the Panzhihua intrusion indicate that plagioclase, olivine and Fe-Ti oxides were crystallized at a similar temperature range. Thus, it is possible to estimate variation of temperature, oxygen fugacity (fO2) and magma composition during the formation of the magnetite gabbro and gabbro in different cycles of the Panzhihua layered intrusion by means of compositions of plagioclase and olivine. Crystallizations of plagioclase of the lower and middle zones of the Panzhihua intrusion occurred between 1 079 ℃ and 1 121 ℃, the authors estimate that Fe-Ti oxide probably crystallized at the same temperature range as well. On the other hand, decrease of Fo of olivine from magnetite gabbro to gabbro within a cycle unit indicate that fO2 decreased during fractional crystallization of a new replenished magma.