Natural Magnetic Moments of Two Chondritic Meteorites
Natural Magnetic Moments of Two Chondritic Meteorites
复制标题
两颗球粒陨石的自然磁矩
作者：
F. Stacey;J. Lovering
大多数次生或球粒陨石由硅酸盐、硫化物、磷化物、氧化物和金属相的不规则颗粒组成。它们通常被认为是次级陨星体的碎片，而次级陨星体本身是破碎的初级陨星碎片的堆积。次级陨石的压实过程似乎并没有伴随足够的加热来熔化任何组成相1,2，这导致一般的结论，即这些次级陨石没有能够产生陆地磁场的流体、导电岩心，而初级陨石可能有这种情况3。这意味着磁粒子的排列或热残余或化学磁化的感应不太可能发生在次级体中，因此，球粒陨石不可能具有地球上获得的磁矩以外的磁矩。
MOST of the secondary or chondritic meteorites are composed of irregular grains of silicate, sulphide, phosphide, oxide and metal phases. They are generally thought to be fragments of secondary meteorite bodies which were themselves accumulations of debris from disrupted primary bodies. The process of compaction of the secondary bodies does not appear to have been accompanied by sufficient heating to have melted any of the constituent phases1,2, which leads to the general conclusion that these secondary bodies did not have fluid, conducting cores capable of producing terrestrial-type magnetic fields, as is possible in the primary meteorite bodies3. This implies that alignment of magnetic particles or induction of thermo-remanent or chemical magnetization is unlikely to have occurred in the secondary bodies and therefore that the chondritic meteorites would not be expected to have magnetic moments other than those acquired on the Earth.