这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。
The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.
各种气体和矿物质都以火山灰的形式被封存在冰体里，它们能告诉我们许多过去的关于世界气候的信息。
Gases and minerals, in the form of volcanic dust trapped in the ice, can tell us a lot about what the world's climate was like in past ages.
二者的平衡反映灰成分的催化能力，常用矿物质催化指数MCI来表示。
The balance of the both represents the ash catalytic ability. It is often shown as mineral catalytic index MCI.
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