Characteristics and Magmatism of Mafic Ultramafic Layered Intrusions
详细信息
- 责任者：Xia Zhaode (College of Earth Science and Recourses ; Chang’an University ; Xi’an 710054 ; China) ; Jiang Changyi
- 刊名：Northwestern Geology
- 出版年：2011
- 卷期：44(1)
- 关键词：超镁铁质岩 ; ultramafics ; 层状侵入体 ; layered intrusions ; 镁铁质岩 ; mafic rocks
- 页码：p.85-94
- 图表：60 refs.
- 分类号：0801
- issnNo：ISSN1009-6248
- isbnNo：CN61-1149/P
摘要
Mafic-ultramafic layered intrusions can occur in various tectonic settings and have typical layered structure and prosodic structure. The magmatisms for layered rocks are mainly gravity differentiation, double-diffusive convection, compaction, assimilation contamination, and magma mixing. Gravitational differentiation well explains the vertical changes of rock types and variations of mineral composition in layered intrusions. Double-diffusive convection and magma mixing play an important role in the formation process of rhythmic beddings. Compaction plays a key role in the late stage of magma evolution for the formation of adcumulatic texture. Assimilation contamination can change the composition of magma, resulting in changes in the composition of magma differentiation. The types of crystal structures depend on the different activities of inter-cumulus liquid and penetration rate of crystal mush, and adcumulatic texture formation requires high permeability.
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