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| 新疆东准噶尔花岗岩类岩石高温高压弹性波速度及其对地壳结构的约束 | |
| Alternative Title | The elastic wave velocities of the granitoids from Eastern Junggar of Xinjiang at high temperature and high pressure and their geological constraints on the crustal structure |
| 臧春娟; 王明梁; 刘永刚; 唐红峰 | |
| 2014 | |
| Source Publication | 地球物理学报
 |
| Volume | 57Issue:7Pages:2099-2112 |
| Other Abstract | The compressional (V-P) and shear wave velocities (V-S) of typical granitoids (alkali-feldspar granite, alkaline granite, granodiorite, monzogranite and quartz diorite) from Kalamaili granite belt and Yemaquan body in Eastern Junggar, Xinjiang were experimentally measured at pressures up to 1. 0 GPa ( room temperature) and temperatures up to 700 degrees C (1. 0 GPa) by ultrasonic reflection-transmission method. The results show that both V-P and V-S of the granitoids present a linear velocity increase with the pressure at room temperature from 0. 4 1. 0 GPa, which is interpreted in terms of closure of the microcracks in rocks under this pressure range. The V-P and V-S of the granitoids are 5. 79 similar to 6. 84 km . s(-1) and 3. 26 similar to 3. 85 km . s(-1) respectively at room temperature and 1. 0 GPa. On the basis of the linear relationship between pressure with V-P and V-S, we derived the pressure derivatives of V-P, and V-S as 0. 1568 similar to 0. 4078 km/(s . GPa) and 0. 0722 similar to 0. 3271 km/(s . GPa) respectively, and the reference velocities V-P0 and V-S0 are 5. 62 similar to 6.47 km . s(-1) and 3. 15 similar to 3. 75 km . s(-1) respectively. At 1. 0 GPa, V-P and V-S of the granitoids show a linear decrease with temperature from room temperature to 700 degrees C, and temperature derivatives of velocities are (-3. 41 similar to -4. 96) X 10(-4) km/(s . degrees C) and (-0. 88 similar to-3. 22) X 10-4 km/(s . degrees C), respectively. Taking advantage of derivatives of velocities and reference velocities of the granitoids obtained from our experiments, and combining regional geothermal resources of East Junggar area, V-P and V-S-depth profiles were calculated. From the comparison of velocity-depth profiles with geophysical exploring results, we infer that the V-P and V-S of the alkali-feldspar granite, alkaline granite, monzogranite and part of granodiorite in Eastern Junggar of Xinjiang are coherent well with the velocity of the upper crust, and the average Poisson's ratio of several rocks are also consistent with the Poisson's ratio of the upper crust. Therefore, we suggest that these kinds of rocks are important parts of the upper crust in this region. In addition, the V-P and V-S of the quartz diorite are both in accord with the middle crust, suggesting that it may be one kind of rocks in the middle crust of this region. |
| Keyword | 弹性波速度 高温高压实验 花岗岩类 地壳结构 新疆东准噶尔 |
| Subject Area | 地球深部物质与流体作用地球化学 |
| Indexed By | CSCD |
| Language | 中文 |
| CSCD ID | CSCD:5204943 |
| Citation statistics |
Cited Times:3[CSCD]
[CSCD Record]
|
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5250 |
| Collection | 地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文 |
| Recommended Citation GB/T 7714 | 臧春娟,王明梁,刘永刚,等. 新疆东准噶尔花岗岩类岩石高温高压弹性波速度及其对地壳结构的约束[J]. 地球物理学报,2014,57(7):2099-2112. |
| APA | 臧春娟,王明梁,刘永刚,&唐红峰.(2014).新疆东准噶尔花岗岩类岩石高温高压弹性波速度及其对地壳结构的约束.地球物理学报,57(7),2099-2112. |
| MLA | 臧春娟,et al."新疆东准噶尔花岗岩类岩石高温高压弹性波速度及其对地壳结构的约束".地球物理学报 57.7(2014):2099-2112. |
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