Spherulite in metamorphic rocks and its implication for metamorphism
文献类型：期刊论文
| 作者 | Chen AnPing2,3; Shi YongHong1; Zeng XiaoYan2,3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2019 |
| 卷号 | 35期号:10页码:3262-3270 |
| 关键词 | Spherulite Non-equilibrium crystallization Metamorphic texture Metamorphic conditions Timescale of metamorphism |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2019.10.17 |
| 英文摘要 | Spherulite 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. |
| WOS关键词 | MORPHOLOGICAL EVOLUTION ; CRYSTAL MORPHOLOGY ; GARNET GROWTH ; MONTE-CARLO ; CRYSTALLIZATION ; ECLOGITE ; EARTHQUAKES ; GRAPHITE ; FLUID ; TEXTURES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000491168800017 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/93907]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Shi YongHong |
| 作者单位 | 1.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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