Chinese Journal of Geochemistry

, Volume 9, Issue 2, pp 182–187 | Cite as

Sub-microscopic textures and retrogressive metamorphic origin of Longxi nephrite

  • Wang Chunyun
  • Zhang Huifen
  • Ren Guohao


Nephrite specimens from Longxi, Sichuan, prepared by ion-thinning and dispersion techniques have been studied using TEM and SAED. A series of sub-microscopic textures such as (010) multiple-chain faults and related fault terminations, (001) mechanical twinning, sub-grain boundaries or fault walls, tremolite fibrous pseudoform of talc and intergrowth of tremolite and talc with (010) as interface are revealed. By analogy of metallographic textures, characteristics and mechanisms of the process of “deformation — recovery — recrystallization” are discussed in detail, Topotactic reaction mechanism by which tremolite retrogresses to talc was studied and a retrogressive metamorphic origin of Longxi nephrite is proposed.


Slip System Talc Fault Wall Mechanical Twinning Electron Diffraction Study 
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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1990

Authors and Affiliations

  • Wang Chunyun
    • 1
  • Zhang Huifen
    • 1
  • Ren Guohao
    • 2
  1. 1.Institute of GeochemistryAcademia SinicaChina
  2. 2.Wuhan University of TechnologyChina

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