Clay Mineral Composition and Diagenesis: Effects on the Location and Behavior of Faults in the Frontal Portions of Subduction Zones
Clay Mineral Composition and Diagenesis: Effects on the Location and Behavior of Faults in the Frontal Portions of Subduction Zones
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粘土矿物成分和成岩作用：对俯冲带前部断层位置和行为的影响
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Underwood
中科院分区：
文献类型：
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作者：
M. Underwood
地震带实验（SEIZE）的一个更雄心勃勃的目标是区分变化的内在摩擦强度（即，断层泥与围岩）以及断层带内孔隙压力逐渐或瞬时增加的影响。在俯冲带中，这两个变量都可能随着板块边界距离的增加而变化。除了沉积物的凝聚力和内摩擦系数外，任何给定地层间隔的剪切强度取决于流体压力和总正应力。在成岩作用期间，流体从泥岩中的释放（包括从有机质中产生的挥发物）受到机械压实、构造固结和矿物反应的组合的调节。因此，至关重要的是，以确定如何渗透性，沉积物衍生的流体来源，和流体流动有助于超压条件内的俯冲输入，开始在2500米或更少的深度的俯冲前向海。
One of the more ambitious goals of the Seismogenic Zone Experiment (SEIZE) is to discriminate between the effects of changing intrinsic frictional strength (i.e., gouge versus wall-rock) and the effects of gradual or transient increases in pore pressure within fault zones. In subduction zones, both variables are likely to change with increasing distance down the plate boundary. In addition to sediment’s cohesion and coefficient of internal friction, the shear strength of any given stratigraphic interval depends upon fluid pressure and total normal stress. The release of fluids from mudstones during diagenesis (including volatiles generated from organic matter) is modulated by a combination of mechanical compaction, tectonic consolidation, and mineral reactions. Thus, it is essential to determine how permeability, sedimentderived fluid sources, and fluid flow contribute to overpressure conditions within the subduction inputs, beginning seaward of the subduction front at depths of 2500 m or less.