Economic and Environmental Geology (자원환경지질)
- Volume 21 Issue 4
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- Pages.349-358
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- 1988
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- 1225-7281(pISSN)
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- 2288-7962(eISSN)
K - Ar Ages of Mineral Deposits in the Gyeonggi Massif
한반도중부지역(韓半島中部地域)의 광상생성기(鑛床生成期)와 생성구(生成區) -경기육괴내(京畿陸塊內)의 광상생성연령(鑛床生成年齡)-
- Park, Hee-In (Dept. of Geology Seoul Univ.) ;
- Chang, Ho Wan (Dept. of Geology Seoul Univ.) ;
- Jin, Myung Shik (Korea Institute of Energy and Resources)
- Published : 1988.08.31
Abstract
K-Ar ages were determined on gangue and wall rock alteration minerals from twenty metallic mineral deposits in the Gyeonggi Massif. Beryl deposits give the age of 185 Ma, whereas tungsten - molybdenum deposits reveal two different age groups such as 172~156 Ma and 91~86Ma. Lead - zinc deposits and gold - silver deposits yield the ages of 160 Ma and 71~197 Ma, respectively. Mineralization ages for each genetic type of deposits in the Gyeonggi Massif can be summarized as follows; pegmatite deposits, 185 Ma; skarn deposits, 156~160 Ma; hydrothermal deposits, 71~197 Ma. Present results together with data previously reported reveal that rare earths, tungsten-molybdenum, base and precious metal deposits in the Gyeonggi Massif were formed in Jurassic and Cretaceous time with a genetic relationship to the Daebo and Bulguksa felsic igneous activity.
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