If that type of mineral is missing from all of the zircons in a particular sample, he notes, that's a clue that the inclusions may have been chemically altered.
如果在某一次取样中，所有的锆石里都不含这种矿物，那就是在提示包体的化学成分可能已经发生了改变。
2
Mineral alteration data are extracted and spatial distribution features of altered rocks are acquired by remote sensing information extraction ways.
通过遥感数据提取矿化蚀变信息，获取蚀变岩的空间分布特征，一直是遥感找矿工作的重要研究内容。
3
The GIS evaluation model may be used to process altered rock information interpreted by ASTER, which may produce accurate remote sensing anomalies and guide mineral exploration.