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Geology and Geochemistry of Volcanic and Sedimentary Rocks from Deep Borehole in the Heunghae area, North Kyungsang Province  

Lee, Chang-Bum (Geothermal Resources Division, Mineral Resources Division, KIGAM)
Kim, Tong-Kwon (Geothermal Resources Division, Mineral Resources Division, KIGAM)
Park, Deok-Won (Geothermal Resources Division, Mineral Resources Division, KIGAM)
Publication Information
The Journal of Engineering Geology / v.19, no.4, 2009 , pp. 459-474 More about this Journal
Abstract
By the analysis of discontinuity at the outcrop and lineament on the satellite image, the joints have deeply relationship with the lineaments. The joint spaces at the drilling core are mostly 1~20 cm but at the rhyolite which is distributed near fault they have more closely. These volcanic rocks belong to the subalkaline series tuff, rhyolite, basalt in the study area from the diagram of $Nb/Y-Zr/TiO_2$. The composition diagram of Hf/3-Th-Nb/16 show destructive plate-margin basalt and their differentiates. The environment of formation of volcanics are normal continental arc. Most of LREE show high enriched pattern but HREE show depleted pattern. The K/Ar age of intermediate volcanics, tuff, rhyolite, crystal tuff are 55.3Ma, 77.25 Ma~91.22Ma, 63.16~64.39Ma, 54.49 Ma respectively.
Keywords
discontinuity; lineament; destractive plate-margin basalt; normal continental arc;
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