实验资料表明,一些火成镁铁质包体是在岩浆库中下伏的镁铁质岩浆层和上覆较富硅质岩浆层分界处通过气相溶离和汽泡化作用形成的。报道了南极半岛西北帕默陆地坎贝尔山脊一个大的复式岩体分界面上出露的几平方米的厘米尺度的羽状构造,认为这种羽状构造可作为岩浆层上下标志,对解释古地磁资料可能具有特殊的价值,同时也反映了“冻结”镁铁质包体的形式。 Experimental data indicate that some of the igneous mafic inclusions are formed by gas-phase dissolution and bubble-forming at the boundaries between the underlying mafic magma layer and the overlying silier magmatic layer. The centimeter-scale plume of a few square meters exposed at the interface of a large compound rock at the Campbell ridge in the Palmer land of the Northwest Antarctic Peninsula is reported. This feather-like structure can be used as a symbol of magmatic layer up and down, Information may have special value, but it also reflects the form of “frozen” mafic inclusions.