A heat flow based cooling model for tectonic plates
A heat flow based cooling model for tectonic plates
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DOI：
10.1016/j.epsl.2012.10.036
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发表时间：
2013-01-01
影响因子：
5.3
通讯作者：
Hasterok, D.
中科院分区：
文献类型：
--
作者：
Hasterok, D.
板块构造理论预测，随着年轻的热浮力岩石圈老化和冷却，会发生沉降和热流减少。海洋冷却模型被重新校准为新的“无热液”热流数据集，以更好地适应旧海底（> 80 Ma）的热流，同时允许更合理的地幔潜在温度（1350 摄氏度）。板模型（恒定基础温度）和夏布利斯（恒定基础温度和恒定基础热流）作为观测数据的可行解决方案进行了测试。两种模型都符合合理的失配值，但在考虑额外的统计约束后，只有板冷却模型是可接受的。最拟合的板块模型得出的岩石圈厚度（90 公里）比之前的估计更薄。这些结果改进了对通过洋壳的全球热损失率的估计（29.4 TW，与全球 44 TW 相似），并改进了海洋岩石圈热结构的估计时间演化，表明岩石圈-软流圈边界较浅。该模型可以作为估计年轻海底通风热液循环引起的全球热量重新分配的参考。 (C) 2012 Elsevier B.V. 保留所有权利。
Plate tectonic theory predicts subsidence and decreasing heat flow as young, hot buoyant lithosphere ages and cools. Oceanic cooling models are re-calibrated to a new 'hydrothermal-free' heat flow dataset to provide a better fit to heat flow on old (> 80 Ma) seafloor while simultaneously allowing for a more reasonable mantle potential temperature (1350 degrees C). The plate model (constant basal temperature) and chablis (constant basal temperature and constant basal heat flow) are tested as viable solutions to the observed data. Both models fit to reasonable values of misfit, but only the plate cooling model is acceptable after considering additional statistical constraints. The best-fitting plate model results in a thinner lithospheric thickness (90 km) than previous estimates. These results improve estimates of global heat loss rate through oceanic crust (29.4 TW, similar to 44 TW globally) and improves the estimated temporal evolution of the thermal structure of oceanic lithosphere suggesting a shallower lithosphere-asthenosphere boundary. This model can serve as a reference for estimating the global redistribution of heat by ventilated hydrothermal circulation through young seafloor. (C) 2012 Elsevier B.V. All rights reserved.