By Menzies, Bruce Keith; Ng, C. W. W.; Simons, N. E
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Extra info for A short course in soil-structure engineering of deep foundations, excavations and tunnels
12 Global distribution of transform plate boundaries (after Hamblin and Christiansen, 2001). , Upper Saddle River, NJ However, significant vertical movement associated with transpression and thrusting have also occurred. This has resulted from a change in plate motions about 6 to 7 million years ago. The mountains that form the Southern Alps, which rise to over 3500 m, are a result of this. e. crystals aligned in a preferred orientation) caused by the shearing motion of the faults. Fault breccias and fine-grained mylonite are created.
In many cases the magma chamber is the final destination. Slow cooling takes place resulting in an intrusive rock that solidifies within the magma chamber. This is described as plutonic and the solidified magma is referred to as a pluton. The slow rate of cooling at depth allows crystals to grow to sizes that are easily visible to the naked eye. The resulting igneous rock is described as coarse-grained. This is in marked contrast to the fine-grained rocks that result from the solidification of lava from a volcano.
In this way the magma will have higher silica content than the original rock. Most of the Earth’s mantle is made up of peridotite, a rock that averages 40% silica. Partial melting of peridotite will produce a magma with a 50% silica content. If this basaltic magma erupts on the surface and cools, it will form the igneous rock called basalt. Oceanic crust is composed of basalt that poured out of volcanoes along the oceanic ridges. This magma tends to be very hot and low in dissolved gas content.
A short course in soil-structure engineering of deep foundations, excavations and tunnels by Menzies, Bruce Keith; Ng, C. W. W.; Simons, N. E