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Mineralogical and Geochemical Characteristics and Designation of Key Beds for the Effective Surveys in the Jeonnam Clay Deposits
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Mineralogical and Geochemical Characteristics and Designation of Key Beds for the Effective Surveys in the Jeonnam Clay Deposits
Yoo, Jang-Han; Koh, Sang-Mo; Moon, Dong-Hyuk;
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Clayey ores of the Jeonnam province mainly consist of pyrophyllite (monoclinic), kaolinite (1T), and minor amounts of quartz, muscovite, and feldspars. Mineralogical studies revealed that two kinds of clay minerals were mainly produced from the volcanic sediments with similar ages and compositions. Kaolinite deposits sometimes contain neither diaspore nor corundum, but alunites are often found in the upper portions of the kaolin ore bodies. On the other hand, corundum and diaspore are commoner in the pyrophyllite deposits than the kaolin deposits. As ages of rock formations are becoming younger, amounts of pyrophyllite and kaolinite are rather radically decreased, and finally disappeared. But muscovite, quartz, and plagioclase feldspars are inclined to be preserved because of weak alteration. Most of clay ore bodies contain purple tuff beds on the uppermost portion, and silicified beds, tuff, and lapillistone are found in an ascending order in the most of clay quarries. Chemical analyses show that higher contents of might not necessarily be due to the argillization, since some tuffs contain higher contents originated from feldspars. contents are fairly higher in the silicified beds than in those of adjacent formations, which might have been introduced from the ore bodies. And contents are obviously lower than those of and CaO in the ores and their vicinities. Ignition losses of some of clays represent much higher contents than those of the ordinary ones because of the sporadic presence of alunite, diaspore and corundum which are accompanied with lots of and contents. REE (rare earth element) abundances of most of volcanics and clay ores show rather higher LREE (light rare earth elements) contents, and represent small to moderately negative Eu anomalies. Though most of ores ususally show milky white color, fine-grained and well bedded formations which could be easily discernible in the most of outcrop. But more distinct characteristics are desirable where rather massive ore bodies exist. Purple tuffs and silicified beds above the ore bodies would be useful as marker horizons/key beds since they have rather obvious lithology, extension and mineralogy than those of other adjacent formations.
pyrophyllite;kaolinite;corundum;diaspore;alunite;ignition loss;
 Cited by
밀양납석광상의 열수변질 특징,문동혁;곽경윤;이부영;구효진;조현구;

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