Revisiting the orogenic energy balance in the western Taiwan orogen with weak faults
Revisiting the orogenic energy balance in the western Taiwan orogen with weak faults
复制标题
再论台湾西部造山带弱断层的造山能量平衡
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
B. Meade
中科院分区：
文献类型：
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作者：
B. Meade
会聚边缘的造山带必须满足克服重力抬升岩石所需的能量要求，允许沿基底台背沿着摩擦滑动，并适应内部变形过程。临界锥度和运动学楔理论的组合预测这些能量汇之间的分区作为断层和地壳强度的函数。结合地壳孔隙流体压力和主要断层摩擦系数的当代估计，我们发现，与内部变形过程相关的工作是台湾西部造山楔的主要能量汇。这些过程消耗了总工作预算的54%，而与基底拆离体上的摩擦滑动和克服重力提升岩石相关的耗散率较低，分别仅需11%和35%。这些结果表明，在造山楔的断层占主导地位的运动学变形预算，但内部分布的变形过程占主导地位的能量预算的力学二分法。
Orogens at convergent margins must meet the energetic requirements necessary to lift rocks against gravity, allow for frictional sliding along basal detachments and accommodate internal deformation processes. The combination of critical taper and kinematic wedge theories predicts the partitioning between these energy sinks as a function of both fault and crustal strengths. Integrating contemporary estimates of both crustal pore fluid pressures and the coefficient of friction on major faults, we find that work associated with internal deformation processes is the dominant energy sink in the western Taiwan orogenic wedge. These processes consume 54% of the total work budget, while the dissipation rates associated with frictional sliding on the basal detachment and lifting rocks against gravity are lower, requiring only 11% and 35% respectively. These results suggest a mechanical dichotomy in orogenic wedges where the faulting dominates the kinematic deformation budget, but internal distributed deformation processes dominate the energy budget.