大别山超高压变质岩后成合晶矿物中微细流体包裹体的透射电镜研究

Translated title of the contribution: Transmission electron microscopy study on the fine fluid inclusions in symplectitic minerals from UHP metamorphic rocks at Shuanghe of Dabie Mountains, China

Da Wei Meng*, Xiu Ling Wu, Xiao Yu Fan, Li Wu Huang, Fan Sun, Jian Ping Zheng

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The research about fluid inclusions has significant implications for understanding the formation condition, tectonic evolution and dynamic process of crustal rocks. Fluid inclusions at a nano-scale to submicron-scale and their relationship with structural defect in retrograde metamorphic minerals or symplectitic corona minerals (albite, augite-aegirine, taramite and magnetite) from UHP jadeite quartzite at Shuanghe of Dabie Mountains, China, have been investigated by using transmission electron microscopy (TEM). It has been observed that the size (1 nm ∼ 200 nm) of fluid inclusions in such minerals is much smaller than that (10 nm ∼ 350 nm) in quartz. Most fluid inclusions are rounded or negative crystal shaped, while some being irregular orgrouped, with H2O or CO2, fluids. The fluid inclusions often intergrow in dislocations, dislocation networks, crystal boundary or subboundaries and so on. These dislocations and structural defect space represent a favorable path for non-crepitative fluid phase leakage. The cluster of water molecules on the nano-scale (1 nm ∼ 30 nm) with non-uniform distribution has been discovered in deformed albite. The cluster of water molecules presenting in spherical inclusions in symplectitic minerals directly causes hydrolytic weakening and induces the plastic deformation of symplectitic minerals by dislocations. These fluids and cluster of water molecules could accelerate the plastic deformation and the retrograde metamorphism course of rocks, which reflecting an uplift history after high-pressure (HP) metamorphism at Dabie Mountains.

Original languageChinese
Pages (from-to)1-6
Number of pages6
JournalKuangwu Yanshi
Volume27
Issue number1
Publication statusPublished - Mar 2007
Externally publishedYes

Keywords

  • Cluster of water molecules
  • Nano-scale fluid inclusion
  • Shuanphe of Dabie Mountains
  • Symplectitic minerals
  • TEM
  • UHP jadeite-quartzite

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  • Cite this

    Meng, D. W., Wu, X. L., Fan, X. Y., Huang, L. W., Sun, F., & Zheng, J. P. (2007). 大别山超高压变质岩后成合晶矿物中微细流体包裹体的透射电镜研究. Kuangwu Yanshi, 27(1), 1-6.