Neutro- acid batholith of Yanshan stage is the parent rock of small metallogenetic rock which is the metallogenetic parent rock of porphyry - type molybdenum deposit.

燕山期的中酸性岩基是成矿小岩体的母岩，而成矿小岩体又是斑岩型钼矿床的成矿母岩。

There were many others half this size, and they all must have traveled at least ninety miles from their parent rock.

可以肯定的是，它们的诞生地至少在90英里以外。

The variation of chemical weathering indices with the depth also supported the result of grain size analysis, i. e. parent rock being inhomogenous.

化学风化指标在剖面的变化也支持了粒度分析结果，即风化壳母岩的不均一性。