The Significance of Heat Transport by Shallow Fluid Flow at an Active Plate Boundary: The Southern Alps, New Zealand
The Significance of Heat Transport by Shallow Fluid Flow at an Active Plate Boundary: The Southern Alps, New Zealand
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活动板块边界处浅层流体流动的热传输意义:新西兰南阿尔卑斯山
DOI:
10.1029/2018gl078692
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发表时间:
2018
影响因子:
5.2
通讯作者:
Coussens J
中科院分区:
文献类型:
--
作者:
Coussens J
Fluid flow can influence fault behavior. Here we quantify the role of groundwater heat advection in establishing the thermal structure of the Alpine Fault, a major tectonic boundary in southern New Zealand that accommodates most of the motion between the Australian and Pacific Plates. Convergence on the Alpine Fault has rapidly uplifted the Southern Alps, resulting in high geothermal gradients and a thin seismogenic zone. A new equilibrium temperature profile from the 818‐m‐deep Deep Fault Drilling Project 2B borehole has been interrogated using one‐dimensional analytical models of fluid and rock advection. Models indicate a total heat flux of 720‐mW m−2results from groundwater flow with Darcy velocities approximating to 7.8 × 10−10m s−1. Groundwaters advect significantly more heat than rock advection in the shallow orogen (<6‐km depth) and are the major control on the subsurface temperature field.
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