| 两种地幔对流模式下俯冲带的热结构 |
| |
| 引用本文： | 臧绍先,宁杰远.两种地幔对流模式下俯冲带的热结构[J].地球物理学报,1994,37(4):448-455. |
| |
| 作者姓名： | 臧绍先 宁杰远 |
| |
| 作者单位： | 北京大学地球物理系, 北京100871 |
| |
| 摘 要： | 根据准动力学计算方案，通过采用等效热源和等效热传导系数的方法，用有限元法计算了不同俯冲角度，而俯冲速度为８ｃｍ／ａ、年龄为１００Ｍａ的俯冲带在稳定俯冲状态的热结构．计算结果表明俯冲带在接近６７０ｋｍ间断面的最低温度可达到１１００℃．全地幔对流模式热结构的计算结果表明６７０ｋｍ间断面以下可存在最低温度达１０００℃的低温区，相应于有０．７％-３．０％的Ｐ波低速异常存在．双层地幔对流模式表明，在６７０ｋｍ间断面以上可有与周围地幔相差约４００℃的水平舌状低温区存在，相应于０．５％-１．４％的Ｐ波低速异常．
|
| 关 键 词： | 地幔对流模式 俯冲带 热结构 间断面 |
| 收稿时间： | 1993-03-19 |
THERMAL STRUCTURES OF THE SUBDUCTION ZONES FOR TWO TYPES OF MANTLE CONVECTION MODELS |
| |
| ZANG SHAO-XIAN,NINC JIE-YUAN,CHRN YU-WEN,ZHOU LI-MEI.THERMAL STRUCTURES OF THE SUBDUCTION ZONES FOR TWO TYPES OF MANTLE CONVECTION MODELS[J].Chinese Journal of Geophysics,1994,37(4):448-455. |
| |
| Authors: | ZANG SHAO-XIAN NINC JIE-YUAN CHRN YU-WEN ZHOU LI-MEI |
| |
| Institution: | Departmemt of Geophysics, Peking University, Beijing 100871 |
| |
| Abstract: | According to the quasi-dynamic scheme,the thermal structures at stable statefor different dip angle of the subducting slabs,in which the subducting velocityand the cooling time are 8 cm/a and 100Ma respectively,were calculated by FEM.Above the 670km discontinuity the minimum temperature near the 670km discontinuityin the subducting slab is about 1100℃; Below the 670km discontinuity there is alow temperature zone for whole mantle convection model,the lowest temperature inthe center is about 1000℃,which is 400℃lower than the one of surroundingmantle;The thermal structures of the subduction zone for the two layered mantleconvection model were showed,there being a tongue shaped horizontal low temperaturezone above the 670km discontinuity,the temperature of which is 400℃ lower thanthe surrounding mantle. |
| |
| Keywords: | Mantle convection model Subduction zone Thermal structure Discontinuity |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
