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Spherulite in metamorphic rocks and its implication for metamorphism
Chen AnPing1,2; Shi YongHong3; Zeng XiaoYan1,2
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:10Pages:3262-3270
AbstractSpherulite or spherulitic texture is a highly non-equilibrium texture consisting of radially arranged fibrous crystals. Spherulites are not only commonly observed in volcanic rocks, pseudotachylyte, sedimentary rocks and hydrothermal sediments, but also widely reported in metamorphic rocks of variable metamorphic grades. Abundant petrogenetic information is recorded in metamorphic spherulites, however, their crystallization mechanism and implication for metamorphism are rarely discussed. From the view of thermodynamics, far from equilibrium conditions induced by temperature, pressure or composition change are required for the crystallization of spherulite. Considering kinetics, spherulite growth is diffusion-controlled and requires very small ratio of diffusion rate to growth rate. Detailed deciphering the controlling factors responsible for formation of spherulites provides valuable constrains on metamorphic conditions and process. Here in this paper, four mechanisms, including crystallization from solute-rich fluid, metamorphic melt, shock metamorphism and highly non-equilibrium metamorphic reaction, are suggested for the growth of spherulites in metamorphic rocks, based on representative spherulites reported in metamorphic rocks and the conditions required by the growth of spherulites. If the crystallization conditions are kept for a fairly long period of time, fibrous crystals in the spherulites with large interface energies are susceptible to recrystallization, which would inevitably obliterate the spherulitic texture. The preservation of spherulites is possible only if they rapidly stay away from crystallization conditions subsequent to their formation. Therefore, the occurrence of spherulites in metamorphic rocks indicates that the host rocks have suffered a highly non-equilibrium and short-lived metamorphic process. Applying quantitative methods used in other subjects and conducting experimental studies at metamorphic conditions are potential ways for further study of spherulites in metamorphic rocks.
KeywordSpherulite Non-equilibrium crystallization Metamorphic texture Metamorphic conditions Timescale of metamorphism
DOI10.18654/1000-0569/2019.10.17
WOS KeywordMORPHOLOGICAL EVOLUTION ; CRYSTAL MORPHOLOGY ; GARNET GROWTH ; MONTE-CARLO ; CRYSTALLIZATION ; ECLOGITE ; EARTHQUAKES ; GRAPHITE ; FLUID ; TEXTURES
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491168800017
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93907
Collection岩石圈演化国家重点实验室
Corresponding AuthorShi YongHong
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Chen AnPing,Shi YongHong,Zeng XiaoYan. Spherulite in metamorphic rocks and its implication for metamorphism[J]. ACTA PETROLOGICA SINICA,2019,35(10):3262-3270.
APA Chen AnPing,Shi YongHong,&Zeng XiaoYan.(2019).Spherulite in metamorphic rocks and its implication for metamorphism.ACTA PETROLOGICA SINICA,35(10),3262-3270.
MLA Chen AnPing,et al."Spherulite in metamorphic rocks and its implication for metamorphism".ACTA PETROLOGICA SINICA 35.10(2019):3262-3270.
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