一般特征六十年代,已在阿拉斯加东南部确定了中-新生代镁铁质/超镁铁质小型带状侵入岩体,并将之作为超镁铁岩的特殊类型划了出来(Taylor和Noble,1960;Taylor,1967)。后来,在苏联乌拉尔也发现了古生代的类似岩体,一段时期以来,“阿拉斯加型和/或乌拉尔型”这样的名称在文献中广泛使用。在超镁铁质岩体分布区内,与之时代相同而不含有超镁铁岩的那些辉长岩体和/或苏长岩体,在岩石学文献中经常单独加以讨论,但本文却也将之 GENERAL FEATURES In the 1960s, Meso-Cenozoic mafic / ultramafic small-banded intrusions have been identified in southeastern Alaska and mapped as a special type of ultramafic (Taylor and Noble , 1960; Taylor, 1967). Later, similar Palaeozoic rock masses were also found in the Urals, Soviet Union. For some time, names such as “Alaskan and / or Ural type” were widely used in the literature. Those gabbro bodies and / or the pluton bodies that are the same in age and do not contain ultramafic rocks within the distribution of ultramafic intrusions are often discussed separately in the petrology literature, but this article also incorporates