Distant off-fault damage and gold mineralization: The impact of rock heterogeneity
Distant off-fault damage and gold mineralization: The impact of rock heterogeneity
复制标题
远距离断层损伤与金矿化：岩石非均质性的影响
DOI：
10.1016/j.tecto.2013.08.043
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发表时间：
2013
期刊：
影响因子：
2.9
通讯作者：
Moir H
中科院分区：
文献类型：
--
作者：
Moir H
现场观察已经确定，故障相关的损害可能发生在远离主滑动面的位置，这是目前预测的断裂区域以外的故障损害模型。我们使用的有限元模型来模拟断裂的启动，由于故障的联系，并显示如何在岩石性质的变化，让离故障的损害发展在令人惊讶的大距离远离主故障。即使在两个相邻的、间隔很近的断层段相互作用和连接之后，断层外的损害仍在继续增长。我们证明，这一过程是重要的，在Mount Pleasant的戈德菲尔德，西澳大利亚州的金矿床的形成。岩性接触面的强弱对断层外损害的位置和强度也有重要影响。我们的方法可以在某种程度上解释某些矿物系统中矿化的非直观分布，以及适用于预测地下压裂和热液/地热储层中的流体流动。
Field observations have established that fault-related damage can occur at locations, far from the principal slip surface, which are well outside the fractured region currently predicted by models of fault damage. We use a finite element model to simulate fracture initiation due to fault linkage and show how variations in rock properties allow off-fault damage to develop at surprisingly large distances away from the main fault. Off-fault damage continues to grow even after two adjacent, closely spaced fault segments have interacted and linked. We demonstrate that this process was important for the formation of fracture-hosted gold deposits in the Mount Pleasant goldfield, Western Australia. The strength of lithological contacts also has a significant impact on off-fault damage location and intensity. Our approach may go some way to explaining the non-intuitive distribution of mineralization in certain mineral systems, as well as being applicable to predict subsurface fracturing and fluid flow in hydrothermal/geothermal reservoirs.