SERPENTINIZATION FAULTS AND THEIR ROLE IN THE TECTONICS OF SLOW SPREADING RIDGES
SERPENTINIZATION FAULTS AND THEIR ROLE IN THE TECTONICS OF SLOW SPREADING RIDGES
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DOI：
10.1029/jb086ib12p11616
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发表时间：
1981-01-01
影响因子：
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通讯作者：
FRANCIS, TJG
中科院分区：
文献类型：
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作者：
FRANCIS, TJG
两大类断裂控制着缓慢扩张山脊的构造：平行于扩张方向的转换断层和由大型侧扫声纳观测到的垂直于扩张方向的‘Gloria’断层。大西洋中脊以下8公里深度的微震观测表明，不仅转换断层而且Gloria断层也穿透到地幔。由于它们往往伴随着较大的水平温度梯度，这两种类型的断层都提供了大量海水在大洋地幔中循环的手段。在这种条件下，上地幔岩石将以可预见的方式发生蛇纹岩作用。讨论了它对缓慢扩张海脊构造发育的影响。
Two major families of faults dominate the tectonics of slow spreading ridges: the transform faults paralleling the spreading direction and the ‘GLORIA’ faults, observed by large‐scale side‐scan sonar, normal to it. The observation of microearthquakes to 8 km depth beneath the Mid‐Atlantic Ridge axis implies that not only the transform faults but the GLORIA faults as well penetrate into the mantle. Since large horizontal temperature gradients are often associated with them, both types of fault provide the means of circulating large volumes of sea water through the oceanic mantle. Under these conditions, serpentinization of upper mantle rocks will occur in a predictable way. Its influence on the tectonic development of slow spreading ridges is discussed.