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http://dx.doi.org/10.9727/jmsk.2014.27.4.301

Mineralogy and Geochemistry of Fault Gouge in Pyrite-rich Andesite  

Park, Seunghwan (Department of Geology, Kyungpook National University)
Kim, Yeongkyoo (Department of Geology, Kyungpook National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.27, no.4, 2014 , pp. 301-310 More about this Journal
Abstract
To investigate the role of fault gauge in the behavior of heavy metals caused by the acid rock drainage in the area of pyrite-rich andesite, XRD, pH measurement, XRF, SEM-EDS, ICP, and sequential extraction method were used. Bed rock consists of quartz, pyrophyllite, pyrite, illite, and topaz, but the brown-colored fault gouge is composed of quartz, illite, chlorite, smectite, goethite, and cacoxenite. The mineral composition of bed rock suggests that it is heavily altered by hydrothermal activity. The concentrations of heavy metals in the bed rock are as follows, Zn > As > Cu > Pb > Cr > Ni > Cd, and those in fault gouge are As > Zn > Pb > Cr > Cu > Ni > Cd. The concentrations of the heavy metals in the fault gouge are generally higher than those in the bed rock, especially for Pb, As, and Cr, which were more than twice as those in the bed rock. It is believed that the difference in the amount of heavy metals between the bed rock and the fault gouge is mainly due to the existence of goethite which is the main mineral composition in the fault gouge and can play important role in sequestering these metals by coprecipitation and adsorption. The low pH, caused by oxidation of pyrite, also plays significant role in fixation of those metals. It is confirmed that the fractions of labile (step 1) and acid-soluble (step 2), which can be easily released into the environment, were higher in the bed rock. Those fractions were relatively low in fault gauge, suggesting that fault gauge can play important role as a sink of heavy metals to prevent those ones from being released in the area where the acid rock drainage can have an influence.
Keywords
fault gouge; acid rock drainage; mobility of heavy metal; goethite; sequential extraction;
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Times Cited By KSCI : 5  (Citation Analysis)
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