过磨铁粉
heavily milled iron powder
区室化结构
compartmental organization
区域地化异常
areal geochemical anomaly
区域地球化学背景
regional geochemical background
区域地球化学场
geochemical exploration
regional geochemical field
区域地球化学调查样品
Samples in Regional Geochemical Survey
区域地球化学分异
regional geochemical differentiation