摘要
There is a close relation in time, space and origin between the NEJXO, NEJXDFZ and HPMZ from NEJXP which are located in and constrained by both Yangtze Craton and Cathaysia. These HPMRs principally include (i) Jd-Q-Ab schist, (ii) Lw-Jd-Ab schist, (iii) Jd-Ab schist, and (iv) Gl-schist. The Jd is nearly pure (Jd91-98). Jd surrounded by Ab is separated from Q and survived due to the reaction between Jd and Q, while Lw encircled by Ab remains as a pseudomorph composed of CZo+ An. The minerals associated with Jd are Lw, Gl, Ab, Q, CZo, An, Pa, Il, Ru, Sp, Ap, and Zr. According to the textures, the mineral paragenesis is classified into four groups (i) Pl-Am-Q, (ii) Jd-Lw-Gl-Q. (iii) CZo-An-Ab-Q, (iv) Ab-Ana-Ser-Ur, corresponding to (i) 1.0-0.93 Ga, 250℃, 2-3×10 8Pa; (ii) 0.93-0.79 Ga, 300-350℃, 5-12×10 8 Pa; (iii) 0.79-0.223 Ga, 350-400-120℃ , 12-5-3×10 8 Pa; and (iv)<0.223 Ga, < 120-50℃ , <3×108 Pa, in time, temperature and pressure respectively. Aclockwise P-T-t path is isothermal increasing in P (up to 45 km)-isothermal decreasing in P (up to 5 km)-nearly isobar decreasing in T.
There is a close relation in time, space and origin between the NEJXO, NEJXDFZ and HPMZ from NEJXP which are located in and constrained by both Yangtze Craton and Cathaysia. These HPMRs principally include (i) Jd-Q-Ab schist, (ii) Lw-Jd-Ab schist, (iii) Jd-Ab schist, and (iv) Gl-schist. The Jd is nearly pure (Jd91-98). Jd surrounded by Ab is separated from Q and survived due to the reaction between Jd and Q, while Lw encircled by Ab remains as a pseudomorph composed of CZo+ An. The minerals associated with Jd are Lw, Gl, Ab, Q, CZo, An, Pa, Il, Ru, Sp, Ap, and Zr. According to the textures, the mineral paragenesis is classified into four groups (i) Pl-Am-Q, (ii) Jd-Lw-Gl-Q. (iii) CZo-An-Ab-Q, (iv) Ab-Ana-Ser-Ur, corresponding to (i) 1.0-0.93 Ga, 250℃, 2-3×10 8Pa; (ii) 0.93-0.79 Ga, 300-350℃, 5-12×10 8 Pa; (iii) 0.79-0.223 Ga, 350-400-120℃ , 12-5-3×10 8 Pa; and (iv)<0.223 Ga, < 120-50℃ , <3×108 Pa, in time, temperature and pressure respectively. Aclockwise P-T-t path is isothermal increasing in
基金
Project supported by the National Natural Science Foundation of China
