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http://dx.doi.org/10.7854/JPSK.2013.22.2.153

GIS-based Areal Distribution Ratios and Characteristics of Constituent Rocks with Geologic Ages and Rock Types in Jeonnam and Gwangju Areas  

Yun, Hyun-Soo (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Lee, Jin-Young (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Hong, Sei-Sun (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Yang, Dong-Yoon (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Kim, Ju-Yong (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Cho, Deung-Lyong (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
Publication Information
The Journal of the Petrological Society of Korea / v.22, no.2, 2013 , pp. 153-177 More about this Journal
Abstract
To get the various data on geological information, distributional ratios and characteristics of constituent rocks with geologic ages and rock types were obtained by ArcGIS 10.1 program, digital geologic and geomorphic maps of 1:250,000 scale in Jeonnam and Gwangju areas. In the Jeonnam area, geologic ages can be largely divided into 7, in which their distribution ratios show decreasing trends in the order of Cretaceous, Precambrian, Jurassic, Quaternary, Age-unknown, Carbonifeorus-Triassic and Triassic, and the former fours make the most prevailing ratios of 94.80%. Rock types in the area can be assorted into 57 ones, in which major 7 ones occupy the dominant ratio of 71.68%. Among them, Kav (acidic volcanics+rhyolite and rhyolitic tuff) show much more distribution ratios than the others. It shows more aspects distributed in north, west, middle, east and south parts, especially in Sinan-Mogpo-Yeongam of west and Haenam of south parts in the area, respectively. On the other hand, geological ages in Gwangju area can be largely divided into 5, in which their distribution ratios show decreasing trends in the order of Jurassic, Quaternary, Cretaceous, Precambrian and Age-unknown, and the former fours occupy almost the whole ratio of 98.95%. Rock types in the area are 12 ones, in which major four ones make up the dominant value of 91.30%. Among them, Jurassic granites of the most dominant value are mostly occupied in the southwest-northeast part of the area. Next dominative Quaternary alluvium is mostly developed along the Yeongsan river, the Hwangryong river and their channel junction. And Yongdu and Donggye plains are well developed around the Yeongsan riverline, and channel junction of the Yeongsan and Hwangryong rivers in the area, respectively.
Keywords
ArcGIS 10.1; digital geologic and geomorphic maps; geologic ages; distribution ratios and characteristics; rock types;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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