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一、前言众所周知,铁磁性物质在温度升高到居里点时就失去磁性。不同岩矿具有不同的居里点,如磁铁矿580℃、钛铁矿在100—578℃、锂铁矿在670℃、钴铁矿520℃、长英质深成岩在440—550℃等。居里面是岩石失去磁性的界面,或称宏观磁性层的下界,它是地壳中达到一定高温深度的一个界面。目前一般认为,岩石的居里点大约在600—800℃。若按正常地热增率3℃/100m估算,其居里点深度在20—30公里。计算地壳中的居里面,对深部地质、地震成因、地热勘探、地壳动力学、内生金属矿的成因及现今活动性断裂的确定,均有一定的实际意义。
I. Preface As we all know, ferromagnetic material loses its magnetism when the temperature rises to the Curie point. Different rock and mineral resources have different Curie points, such as 580 ℃ for magnetite, 100-578 ℃ for ilmenite, 670 ℃ for lithium iron, 520 ℃ for cobaltite and 440-550 ℃ for long quartzitic diagenesis. Living inside the rock is the loss of magnetic interface, or macro magnetic layer of the lower bound, it is the crust to reach a certain depth of depth of an interface. It is generally believed that the Curie point of the rock is about 600-800 ℃. If the normal rate of heat increase 3 ℃ / 100m estimated that its Curie point depth of 20-30 km. Calculating the surface of the earth in the crust has certain practical significance for the deep geology, the cause of the earthquake, the geothermal exploration, the crustal dynamics, the genesis of the endogenic metallogeny and the determination of the current active fracture.