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Crystal fractionation of granitic magma during its non-transport processes: A physics-based perspective
Chen Chen1,2; Ding Xing3,7; Li Rui2,4; Zhang WeiQi2,4; Ouyang DongJian2,4; Yang Lei2,4; Sun WeiDong5,6,7
Corresponding AuthorChen Chen( ; Ding Xing(
AbstractGranitic continental crust distinguishes the Earth from other planets in the Solar System. Consequently, for understanding terrestrial continent development, it is of great significance to investigate the formation and evolution of granite. Crystal fractionation is one of principal magma evolution mechanisms. Nevertheless, it is controversial whether crystal fractionation can effectively proceed in felsic magma systems because of the high viscosity and non-Newtonian behavior associated with granitic magmas. In this paper, we focus on the physical processes and evaluate the role of crystal fractionation in the evolution of granitic magmas during non-transport processes, i.e., in magma chambers and after emplacement. Based on physical calculations and analyses, we suggest that general mineral particles can settle only at tiny speed (similar to 10(-9)-10(-7) m s(-1)) in a granitic magma body due to high viscosity of the magma; however, the cumulating can be interrupted with convection in magma chambers, and the components of magma chambers will tend to be homogeneous. Magma convection ceases once the magma chamber develops into a mush (crystallinity, F >similar to 40-50%). The interstitial melts can be extracted by hindered settling and compaction, accumulating gradually and forming a highly silicic melt layer. The high silica melts can further evolve into high-silica granite or high-silica rhyolite. At various crystallinities, multiple rejuvenation of the mush and the following magma intrusion may generate a granite complex with various components. While one special type of granites, represented by the South China lithium- and fluoride- rich granite, has lower viscosity and solidus relative to general granitic magmas, and may form vertical zonation in mineral-assemblage and composition through crystal fractionation. Similar fabrics in general intrusions that show various components on small lengthscales are not the result of gravitational settling. Rather, the flowage differentiation may play a key role. In general, granitic magma can undergo effective crystal fractionation; high-silica granite and volcanics with highly fractionated characteristics may be the products of crystal fractionation of felsic magmas, and many granitoids may be cumulates.
KeywordGranite Crystal fractionation Magma convection Layering structure Mush model Highly fractionated granite Granite complex Li-F granite
Indexed BySCI
Funding ProjectNational Key R&D Program of China[2016YFC0600204] ; National Key R&D Program of China[2016YFC0600408] ; National Natural Science Foundation of China[41421062] ; National Natural Science Foundation of China[41372005]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000424032300006
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen Chen; Ding Xing
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Chen Chen,Ding Xing,Li Rui,et al. Crystal fractionation of granitic magma during its non-transport processes: A physics-based perspective[J]. SCIENCE CHINA-EARTH SCIENCES,2018,61(2):190-204.
APA Chen Chen.,Ding Xing.,Li Rui.,Zhang WeiQi.,Ouyang DongJian.,...&Sun WeiDong.(2018).Crystal fractionation of granitic magma during its non-transport processes: A physics-based perspective.SCIENCE CHINA-EARTH SCIENCES,61(2),190-204.
MLA Chen Chen,et al."Crystal fractionation of granitic magma during its non-transport processes: A physics-based perspective".SCIENCE CHINA-EARTH SCIENCES 61.2(2018):190-204.
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