| 海洋热流与地幔上升流 |
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| 引用本文： | 欧阳珽.海洋热流与地幔上升流[J].地球物理学报,2000,43(1):38-44. |
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| 作者姓名： | 欧阳珽 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所;
2. 中国科学院地球动力学高温高压开放实验室北京100101; |
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| 摘 要： | 从洋中脊上升的地慢物质带上来的大量热量，使在洋中脊裂谷处的海底热流及温度最高，向海沟逐渐减小．由于热胀冷缩，海底地势在洋中脊处最高．作者根据板块模型由一维运动物体的热传导方程推出裂谷处上升物体的温度分布公式．用此分布公式作为垂直边的边界条件，严格地求解了运动板块的二维运动物体热传导方程．用此方程研究了各参数与观测量之间的关系．通过改变公式中的参数值，使计算的理论曲线与实测海底热流一年龄及海底深度一年龄曲线拟合，从而求出了板块的厚度Ｌ＝９７ｋｍ，地幔上升速度ｕ＝３．ｇｍｍ／ａ，热膨胀系数ａ＝３．３７×１０－５／℃及温度分布．该方法克服了在洋中脊处理论热流值趋于无限大的问题，并可以计算出地幔上升流的速度及宽度．
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| 关 键 词： | 热流 板块模型 海洋 地幔速度 |
| 文章编号： | 0001-5733(2000)01-0037-08 |
| 收稿时间： | 1998-01-21 |
OCEANIC HEAT FLOW AND MANTLE UPFLOW |
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| OUYANG TING.OCEANIC HEAT FLOW AND MANTLE UPFLOW[J].Chinese Journal of Geophysics,2000,43(1):38-44. |
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| Authors: | OUYANG TING |
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| Institution: | 1. Institute of Geology and Geophysics, Geodynamic Laboratory of High Temprature and High Pressuce;
2. Chinese Academy of Sciences 100101, China |
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| Abstract: | The mantle under mid-ocean ridges is the rising edge of mantleconvection cell. A lot of heat is brought by the mantle upflow. According to theone-dimension heat transport equation, the temperature distribution on rising edges isdeduced, which is used as the vertical boundary condition of oceanic lithosphere plate.With this boundary condition, we got the solution of two-dimensional heat transportequation of oceanic lithosphere plate. Formulae of heat flow and ocean depth couldbe deduced from the temperature solution. Joint fitting the theoretical andobservational mean value of heat flow and bathymetry yields a model of oceaniclithosphere. Its parameters are as follows: lithospheric thickness L=97km, basetemperature T=1478℃, upflow velocity u=3.9mm / a, thermal expanse coefficient a =3.65 ×10-5 / ℃, upflow half width D=1240km. The relationship between parametersand observed value are also discussed with these solutions. |
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| Keywords: | Heat flow Plate model Ocean Mantle velocity |
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