Navarro-Hervas(aの頭に´),C., Perez(eの頭に´)-Sirvent,C., Martinez(iの頭は´)-Sanchez(aの頭に´),M.J., Garcia(iの頭は´)-Lorenzo,M.L. and Molina,J.(2012): Weathering processes in waste materials from a mining area in a semiarid zone. Applied Geochemistry, 27, 1991-2000.

『半乾燥地帯における鉱山地域からの廃物の風化過程』


Abstract
 Chemical and mineralogical characterization of waste materials present in an abandoned Pb, Zn-Ag mining site (SE, Spain) was carried out. In unaltered rocks, the mineralogy is characterized by plagioclase, pyroxene, magnetite, ilmenite, amphibole, biotite and quartz. Trace-element contents of these samples represent unaltered values. In mine-waste materials, pH ranged from acidic to slightly acidic and trace-element content was generally high, especially for Pb and Zn, although there were also substantial As concentrations. X-ray diffraction results suggested that these samples have a complex mineralogy, including alteration products. Surficial materials in the study area were affected by weathering processes, generating supergene assemblages, including Fe and Mn oxides and hydroxides, carbonates, hydrated sulfates and jarosite. Knowledge of the geochemical processes that took place in the past and which are still taking place provide an important tool for assessing associated environmental problems in this area.』

1. Introduction
2. Study area
 2.1. Location
 2.2. Geological setting
3. Materials and methods
 3.1. Unaltered/host rocks
 3.2. Mine waste
 3.3. sample preparation and analysis
 3.4. Statistical analysis
4. Results and discussion
 4.1. Unaltered rocks
 4.2. Mine waster materials
 4.3. Relationship between major elements and mineralogical composition
 4.4. Geochemical behavior of the major elements
 4.5. Relationship between total trace element content and mineralogical composition
5. Conclusions
Acknowledgment
References


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