Processes of Formation and Distribution of Pb-, Zn-, Cd-, and Cu-Bearing Minerals in the Tyne Basin, Northeast England: Implications for Metal-Contaminated River Systems
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- 作者：Karen A. Hudson-Edwards ; Mark G. Macklin ; Charles D. Curtis ; and David J. Vaughan
- 刊名：Environmental Science & Technology
- 出版年：1996
- 出版时间：January 1996
- 年：1996
- 卷：30
- 期：1
- 页码：72 - 80
- 全文大小：608K
- 年卷期：v.30,no.1(January 1996)
- ISSN：1520-5851
文摘
Historic mining has produced widespread Pb, Zn,Cd, and Cu contamination in the fluvial deposits of theTyne River Basin, northeast England. Detailedmineralogical analysis of contemporary overbank riversediment, mining-age alluvium, and mine-waste tipsand of suspended solids in river waters has defineda general weathering reaction paragenesis of Pb-,Zn-, Cd-, and Cu-bearing minerals: sulfides 
carbonate,silicate, phosphate, and sulfate weathering products iron and manganese oxyhydroxides. Textural andchemical evidence suggests that the sulfides alterto carbonates in high pH/pCO2,limestone-dominatedsource terrains. These minerals and other contaminant metal-rich minerals such as silicates andmanganese oxyhydroxides decline and disappeardownstream in lower pH shale/sandstone-dominatedenvironments. The concomitant decrease in totalPb, Zn, Cd, and Cu sediment contents in the Tyne andpossibly other metal contaminated rivers may berelated to these essentially chemical weathering anddispersion processes. These are augmented byphysical, hydrodynamic processes that to a largeextent effect dilution by premining Quaternary sedimentand by uncontaminated sediment from tributaries.
carbonate,silicate, phosphate, and sulfate weathering products iron and manganese oxyhydroxides. Textural andchemical evidence suggests that the sulfides alterto carbonates in high pH/pCO2,limestone-dominatedsource terrains. These minerals and other contaminant metal-rich minerals such as silicates andmanganese oxyhydroxides decline and disappeardownstream in lower pH shale/sandstone-dominatedenvironments. The concomitant decrease in totalPb, Zn, Cd, and Cu sediment contents in the Tyne andpossibly other metal contaminated rivers may berelated to these essentially chemical weathering anddispersion processes. These are augmented byphysical, hydrodynamic processes that to a largeextent effect dilution by premining Quaternary sedimentand by uncontaminated sediment from tributaries.