In situ infiltration-precipitation processes in some rock systems  

作　　者：Zahraa Ibrahim Rabih Sultan 

机构地区：[1]Department of Chemistry,American University of Beirut,Beirut,Lebanon

出　　处：《Acta Geochimica》2023年第5期870-878,共9页地球化学学报（英文）

基　　金：supported by a grant from the University Research Board(URB)of the American University of Beirut(AUB).

摘　　要：We carry out a chemical treatment(acidization or basification)of typical rock specimens in-situ,and characterize the emerging pattern resulting from the infil-tration-precipitation scenario.Galena and limestone sam-ples were treated with sulfuric acid,while pyrite was reacted with sodium hydroxide.Various infiltration tech-niques were employed,after selection of the most feasible method for each rock separately.The patterns of anglesite(PbSO_(4)),anhydrite(CaSO_(4))and goethite(FeOOH)depo-sition presented different alteration modes of the bare rock textures.Among the three deposited minerals,only the anhydrite(CaSO_(4))displayed a band stratification.The formation of a Liesegang pattern in the rock of highest porosity indicates a plausible correlation between the band formation and a minimum porosity requirement.A banded rock of compact texture could then be formed by a cementation mechanism,governing the long time evolution of the rock.

关 键 词：Liesegang LIMESTONE GALENA PYRITE Anglesite GOETHITE Reaction–diffusion PERCOLATION Porosity Pattern formation 

分 类 号：TU45[建筑科学—岩土工程]