Downward continuation of heat flow data: Method and examples from the western United States
Downward continuation of heat flow data: Method and examples from the western United States
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热流数据的向下延拓：来自美国西部的方法和例子
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
R. Lowell
中科院分区：
文献类型：
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作者：
J. Mareschal;J. P. Cunningham;R. Lowell
我们概述了一种方法来确定，直接从数据，地下温度分布，这是兼容的表面热流，并考虑到浅层热源的影响。分析假设：（1）地壳处于传导平衡，（2）导热率的横向变化可以忽略不计，（3）热源的深度与地表热流变化的波长成正比。我们应用该技术来确定地壳温度在两个构造活跃地区的美国西部。在格兰德河裂谷，温度高于1100 °C的预测深度为20公里。在科罗拉多高原与盆地和山脉之间的过渡区，地表热流的变化部分由浅层热源引起;然而，朝向盆地和山脉的热流增加似乎与深层热源有关（即，下地壳或上地幔）的变化。
We outline a method to determine, directly from the data, a subsurface temperature distribution which is compatible with the surface heat flow and takes into consideration the effect of the shallow heat sources. The analysis assumes that (1) the crust is in conductive equilibrium, (2) the lateral changes in thermal conductivity can be neglected, and (3) the depth of the heat sources is proportional to the wavelength of the variations in surface heat flow. We apply the technique to determine the crustal temperatures in two tectonically active regions of the western United States. In the Rio Grande rift, temperatures higher than 1 100°C are predicted at a depth of 20 km. In the transition region between the Colorado Plateau and the Basin and Range, the variability in surface heat flow is partially accounted for by shallow heat sources; however, the increase in heat flow toward the Basin and Range seems associated with deep seated (i.e., lower crust or upper mantle) variations in the thermal regime.