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Dioctahedral Chlorite-Smectite Mixed-Layer Minerals in the Sandstones of the Ulleung Basin, Offshore SE Korea  

Son Byeong-Kook (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.2, 2005 , pp. 73-81 More about this Journal
Abstract
Mineralogical and chemical examinations were performed on chlorite-smectite mixed layer minerals that occur in the sandstones from a petroleum exploration well in the southern part of the Ulleung Basin. X-ray diffraction and chemical analyses show that the chlorite-smectite mixed layer mineral is tosudite, a 1 : 1 R1 ordered interstratification of chlorite and smectite with an overall dioctahedral character. This mineral is almost the same as the tosudite reported from hydrothermally-altered regions, which is rich in Li. This fact indicates that the tosudite area may be affected by hydrothermal events, because the studied well is located in the tectonically-deformed area, in which lots of trust faults and folds are present. In these respects, the formation of tosudite is probably due to the variable effect of hydrothermal fluids from the deeper part of the area.
Keywords
chlorite-smectite; miked layer mineral; Ulleung Basin; X-ray diffraction; tosudite;
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