... downward enrichmentn.次生富集,向下富集 downward enrichment次生富集 downward ventilator下向通风筒，吸气通风筒吸风机 ...
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次生富集带 secondary enrichment zone ; zone of secondary enrichment ; secondary enriched zone
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第二次成矿作用是次生富集作用。
络阴离子团的地球化学性质，控制着红土型金矿床的垂向分带与金的次生富集。
The geochemical nature of the complex anion group controlled the vertical zoning and secondary enrichment of gold in the laterite gold deposits.
但由于原含矿地质体金矿化及构造裂隙分布的不均匀性，使金的次生富集局部出现波动。
The gold enrichment from the lower part to the upper part of the weathering granite is obvious, but the distribution is heterogeneous.
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