玄武岩微生物分解过程中的矿物表面效应

通过玄武岩微生物风化的模拟实验,探讨了造岩矿物表面特征对微生物风化的影响,发现在细菌Paeni-bacillus polymyoca(多粘芽孢杆菌)及其代谢产物的作用下,玄武岩的分解作用显著增强,其中橄榄石最易分解,辉石次之,长石则相对最稳定.根据实验溶液的成分变化,认为橄榄石在初始阶段的分解主要受控于表面化学特征,随着比表面积的增大,表面控制作用进一步增强,分解更为快速.

The effects of mineral surface properties on bacteria-mediated dissolution of basalt

Bacteria-related decomposition of minerals and rocks is an important geological process. In the same environment, different minerals usually weather in different ways, and the weathering characteristics of the same kind of mineral can also be different due to diverse surface properties. Based on experiments of the dissolution of bacteria-related basalt, this paper deals with the effects of surface properties of diagenetic minerals on their dissolution. The result shows that Paenibacillus polymyxa and its metabolites can remarkably promote the dissolution of basalt. Under the bacterial condition, olivine is the most dissolvable mineral, followed by augite, and feldspar is most stable. The dissolution of olivine is controlled mainly by chemical properties at the initial stage, and by the ratio of surface area to weight at subsequent stages.