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Interplay of variable thermal conductivity and expansivity on the thermal structure of oceanic lithosphere II

机译:可变热导率和膨胀率对海洋岩石圈II热结构的相互作用

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We have extended our previous analysis of the effects of constant vs. variable, i.e., pressure and temperature dependent thermal conductivity (k) and constant thermal expansivity (a) on the thermal structure of the oceanic lithosphere. We apply our analysis to the actual data set including information on the geoid slope. The heat flow and ocean floor depth data constrain the thermal expansivity (a 3 10-5 1/°C). Including geoid slope data may loosely constrain both the thermal expansivity and the thermal conductivity. The probable value of thermal conductivity is 3 W/m/°C for the constant k case and 4 W/m/°C (at ambient conditions) for the variable k case. These a and k are generally consistent with laboratory data of appropriate lithospheric materials. Our analysis supports the plate model with thin lithosphere and high bottom temperature, such as GDH1 (95 km; 1450°C). Variable k case requires slightly thinner and higher temperature lithosphere ( 85 km and 1500°C) and gives a slightly better fit to the geoid slope data.
机译:我们已经扩展了对常数与变量(即压力和温度相关的导热系数( k )和常数热膨胀系数( a )。我们将分析应用于包括大地水准面坡度信息在内的实际数据集。热流和海床深度数据限制了热膨胀率( a 3 10 -5 1 /°C )。包括大地水准面坡度数据可能会宽松地限制热膨胀率和热导率。对于常数 k 3 W / m /°C >情况,变量 k 4 W / m /°C(在环境条件下)案。这些 a k 通常与适当的岩石圈材料的实验室数据一致。我们的分析支持岩石圈薄且底部温度高的板块模型,例如GDH1(95 km; 1450°C)。可变的 k 情况需要稍薄且温度更高的岩石圈( 85 km和 1500°C),并且对大地水准面坡度数据的拟合度稍好。

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