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引 言 近十年来为了鉴别大洋盆地中线性磁异常模式的起源,对洋壳磁化强度的研究显示了极大的兴趣。目前了解洋壳(尤其在深部)可以通过几种方法,如在推测为构造断崖的附近进行海底拖曳打捞、通过大洋基底钻探或通过考察蛇绿岩剖面等。 拖曳打捞和钻探均可从原地洋壳的各个层位获得样品,但是在钻探大洋基底时,大多数钻孔的穿透小于100米,一些深孔也小于600米,这个深度与推测的洋壳喷出岩1.5
Introduction In recent ten years, the study of magnetization in the oceanic crust has shown great interest in identifying the origin of linear magnetic anomalies in the oceanic basins. It is now understood that the oceanic crust, especially in the deep, can be retrieved by several methods, such as submarine towing and salvage in the presumption of structural cliffs, drilling through the oceanic basement or by examining the ophiolite profile. Both towing and drilling can obtain samples from all layers of the in-situ oceanic crust, but most of the boreholes penetrate less than 100 meters and some of the deep holes are less than 600 meters in drilling the ocean floor, Shell spout rock 1.5