• 文章目录 •

### 广东省Ⅰ型和S型花岗岩的弹性特征及其大地构造意义

1. 浙江大学地球科学系
• 收稿日期:1995-03-20 修回日期:1995-03-20 出版日期:1995-09-20 发布日期:1995-09-20

### THE ELASTlC PROPERTlES OF S-TYPE AND l-TYPE GRAMTOIDS lN GUANGDONG PROVlNCE AND THElR TECTONIC MEALING

Jiang Jiahuang1, Yang Shufeng1, Chen Hanlin1, Zhu Guoqiang1, Wang Zhenguo2, Ji Zhonglin2, Zhang Boyou2, Guo Sujie2

1. 1. Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China; 2. Shanghai University; Institute of Geochemistry, Sinica Academy, Guangzhou, 510640, China
• Received:1995-03-20 Revised:1995-03-20 Online:1995-09-20 Published:1995-09-20

Abstract: The compressional-wave velocities (Vp) and shear-wave velocities (Vab and Vav )of early Paleozoic S-type and I-type granitoid samples collected from the central and west part of Guangdong province were measured accurately both at atmospheric pressure and room temperature and during heating (up to 1 05℃ )and pressuring (up to 5. 06 × 1 0 7 Pa). Through systematic calculation, we obtained the average values of wave velocities (Vp,Vab an d Vav ),the ratio of compressional-wave velocities and shear-wave velocities (Vp／Vab)and Poisson’s ratio under atmospheric pressure and room temperature and the curves of P-wave and S-wave veloities at various pressures and temperatures. The values of wave velocities(V p,Vab and Vav),Vp／Vab and Poisson’s ratio are different obviously between S-typ e and I-type Granitoids. The average values of wave velocities(Vp, Vab and Vav), Vp／Vab and Poisson’s ratio of S-type granitoids are 5005m／s,2897m／s,2591m/s and 0. 25 and smaller than those of I-type granitoids (5512m／s,2937m／s,2671m／s and 0. 30) especially in compressional-wave velocities. the difference is 507m／s and is 1 0 of wave velocity value of S-type granitoids. The values of Vp／Vab for S-type and I-type granitoids are larger than 1. 70 and located in the normal range of granitoids, but the values of I-type granitoids are larger than that of S-type granitoids. The values of wave velocities of S-type and I-type granitoids increase gradually with increasing pressure and decrease gradually with increasing temperature, but the range of S-type granitoids is larger than that of I-type granitoids obviously. The anisotropy of S-type granitoids is up to 1.10 and larger than that of I-type granitoids. From the elastic properties of S-type and I-type granitoids, we can conclude that the structure and porosity in S-type granitoids are better developed than those in I-type granitoids, and the granite body was intensely compressed in the direction of NNW-SSE during the process of formation.