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Fabric and Deformation of Omphacite in Dabie Ultra‐high‐pressure Ecologites
Author(s) -
Shuqiang JIAO,
Zhenmin JIN,
Shuyan JIN,
Zishan TAN
Publication year - 1999
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1999.tb00850.x
Subject(s) - omphacite , dislocation creep , eclogite , geology , deformation (meteorology) , deformation mechanism , grain boundary sliding , materials science , diffusion creep , dislocation , composite material , grain boundary , microstructure , seismology , subduction , tectonics
The rheological characters of omphacites in Dabie ultra‐high‐pressure eclogite have been studied in terms of fabric, dislocation and micro‐structures. 1. The eclogite has undergone high‐temperature deformation, thus forming omphacite lattice preferred orientation. In addition to creep dislocation, the omphacite ductile deformation may have other mechanisms, such as diffusion creep and grain boundary migration. 2. The main‐phase deformation of eclogite is coaxial, but asymmetry strain also exists due to strain partitioning in the Dabie orogenic belt. 3. The twin measured by the universal stage is (100), indicating that omphacite high‐T deformation was superimposed by low‐T deformation. 4. Subgrain structure is common in omphacite, but the deformation features of the omphacites in the Shuanghe area and Bixiling area are different, the latter being dominated by dynamic recrystallization. 5. The Flinn plots show that the strain of omphacite belongs to the constriction ellipsoid and stretching strain, which is similar to the result of the omphacite fabric analysis.