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。

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.

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采用化学成分分析、宏观和微观组织检验以及力学性能测定等方法对在使用过程中发生开裂的包胶辊进行了分析。

The cracking encapsulated roller in use was analyzed by means of chemical composition, macrostructure and microstructure examination and mechanical property test.

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辉石的化学成分与国内外幔源包体 -橄榄岩和辉石岩中的类似 ，与麻粒岩中的明显不同 ；

Mineral chemically these pyroxenes are similar to mantle enclaves including peridotite and pyroxenite from China and abroad, and different from ones of granulites.

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