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Areal Distribution Ratio of Rock ffes with Geologic Ages in the Gyeonggi-Seoul-Incheon Areas  

Yun, Hyun-Soo (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Lee, Jin-Young (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Yang, Dong-Yoon (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Hong, Sei-Sun (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Publication Information
The Journal of the Petrological Society of Korea / v.16, no.4, 2007 , pp. 208-216 More about this Journal
Abstract
Based on digital geologic and geomorphic maps of 1 : 250,000 scale, distributive ratios of rock types were obtained by ArcGIS 9.0 program in the Gyeonggi, Seoul and Incheon areas of the Gyeonggi province. In the Gyeonggi area, 37 rock types are developed, and their geologic ages can be classified into Precambrian, Age-unknown, Triassic, Jurassic, Cretaceous and Quatemary. Among them, distributive ratios are decreasing in the order of Jurassic Daebo granites, Precambrian banded gneiss of Gyeonggi gneiss complex and Quatemary alluvium, all of which comprise about 83.7% of the rock types in the area. In the Seoul and Incheon areas, 10 and 15 rock types are developed, respectively., with the firmer being classified into Precambrian, Jurassic and Quatemary, and the latter into Precambrian, Jurassic, Cretaceous and Quatemary. In the Seoul area, distributive ratios are decreasing in the order of banded gneiss of Gyeonggi gneiss complex, Daebo granites and alluvium, which consist of 95.5% of the rocks in the area. In the Incheon area, distributive ratios are decreasing in the order of alluvium, Daebo granites, banded gneiss of Gyeonggi gneiss complex, reclaimed land, and schists of Gyeonggi gneiss complex, which occupy about 96.2% of the rocks in the area. The ratio of alluvium in the Incheon area is greater than that of Gyeonggi and Seoul areas, and the ratio of reclaimed land in the Incheon area is greater that of the Seoul, which can be attributed to the recent reclamation of the land for the industrial results such as new town development along the coastline of the Gyeonggi Bay.
Keywords
ArcGIS 9.0; geologic ages; distributive ratios; rock types; reclamation;
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