Modelling of melt composition and zircon behaviour during anatexis

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	Modelling of melt composition and zircon behaviour during anatexis
	Wang Wei 5; Wei ChunJing 1; Liu XiaoChuni ; Zhao Yue ; Gao Liang ; Lou YuXing ; Chu Hang 2; Zhang YingHui 3
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:10 页码:3075-3084
关键词	Anatexis Melt composition Phase equilibrium modelling Zircon Leucogranite
ISSN号	1000-0569
英文摘要	Anatexis is a common process accompanying high grade metamorphism. The melt produced by anatexis can be potential source for leucogranites; and the behavior of zircon during anatexis is crucial for understanding the geological meaning of metamorphic zircon. Phase equilibrium modelling for pelitic composition in the Zr-bearing system indicates that the modelled melt composition varies regularly in the P-T space. The Zr/Si ratio, Zr, FeO, MgO and CaO contents of the melt increase and the Na2O content decreases with increases in temperature. At high temperature the K2O content rises as the temperature increases. The Al/Si ratio and the Na2O content increase with increasing of the pressure. Decompression melting occurs at high temperature where the contours of the Na/(Na + K) ratio are steep will not lead to significant changes in the Na/(Na + K) ratio of the melt. But the processes involving decompression-heating and isobaric heating will remarkably decrease the Na/(Na + K) ratio of the melt. At medium pressure, the Fe/(Fe + Mg) ratio of the melt rises slowly with increases in temperature before the growth of garnet, which then effectively decreases the Fe/(Fe + Mg) ratio. The melt by solidus melting, muscovite and biotite dehydration melting has different compositions. The variation trend of the modelled melt compositions in the P-T space can help interpret the origin of leucogranites. The modelled relationships between zircon and major silicate mineral phases and melt indicate that prograde metamorphism is basically a zircon consuming process, and metamorphic zircon should mainly form during cooling and record the time of retrograde metamorphism. Loss of melt with less Zr content at low temperature can expand the zircon stability during prograde metamorphism. On the contrary, the melt loss at high temperature can decrease the zircon stability. A process similar to the fractional melting could most effectively expand the stability of zircon in the residuum.
学科主题	火成岩岩石学
WOS关键词	GEOCHEMICAL CONSTRAINTS ; CRUSTAL ANATEXIS ; PHASE-RELATIONS ; MORTON PASS ; MIGMATITES ; SYSTEM ; ROCKS ; METAGREYWACKES ; LEUKOGRANITE ; SEGREGATION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000344215200021
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41042]
专题	中国地质调查局天津地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 3.Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China 4.Chinese Acad Geol Sci, Inst Geol, Beijing 103007, Peoples R China 5.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Wang Wei,Wei ChunJing,Liu XiaoChuni,et al. Modelling of melt composition and zircon behaviour during anatexis[J]. ACTA PETROLOGICA SINICA,2014,30(10):3075-3084.
APA	Wang Wei.,Wei ChunJing.,Liu XiaoChuni.,Zhao Yue.,Gao Liang.,...&Zhang YingHui.(2014).Modelling of melt composition and zircon behaviour during anatexis.ACTA PETROLOGICA SINICA,30(10),3075-3084.
MLA	Wang Wei,et al."Modelling of melt composition and zircon behaviour during anatexis".ACTA PETROLOGICA SINICA 30.10(2014):3075-3084.