adj.同位素的；合痕的
How could such a change in isotopic composition have come about? 同位素的组成有这样的变化，究竟是如何发生的？
Conversely,the isotopic characteristics will be well explained by assuming that the UHPM occurred in the crust instead in the upper mantle. 相反，如果认为大别山超高压变质岩就在地壳内形成，则大别山超高压变质岩同位素的所有特征就很好解释了。
adv.同位素地(合痕地)
