A Study of Mineralogy and Petrochemistry of Jijie Alkaline-Ultramafic Rocks, Southern Part of Panxi Rift

• 责任者：Zhao Zheng (State Key Laboratory of Ore Deposit Geochemistry ; Guiyang Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Qi Liang
• 刊名：Earth Science Frontiers
• 出版年：2010
• 卷期：17(2)
• 关键词：碱性岩 ; alkali rocks ; 超镁铁质岩 ; ultramafics ; 攀西裂谷 ; Panxi Rift ; 云南 ; Yunnan Province
• 页码：p.320-335
• 图表：15 illus., 3 tables, 41 refs.
• 分类号：0801
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

This paper reports the lithofacies, mineral chemistry and petrochemistry of alkaline-ultramafic rock complex in Jijie, the southern part of Panxi rift, Yunnan Province.  Clinopyroxene and nepheline are the main component minerals, which have negative correlations in melteigite, ijolite and urtite. The Fo value of xenocryst olivine (75.43~77.42) is obviously higher than that of the phenocryst olivine (72.02~72.95) in melteigite, which suggests that the parent magma had undergone a previous olivine crystal differentiation. The characteristics of the major elements and related parameters (M, CA, AR, SI, DI) suggest that the parent magma of Jijie complex was strongly Si-undersaturated, Na-rich alkaline magma.