Abstract
The chemical similarity of magnetite-bearing amphibolites from the Yangyang iron mine in Korea to mixtures of pelite and limestone or dolomite is consistently indicated by all the available chemical data. The chemical variation trends of the rocks were compared with ortho-(discordant-) and massive amphibolites from the Gyeonggi metamorphic complex, Korea. Samples of nine amphibolites from the Yangyang mine, and two ortho-amphibolites and six massive amphibolites from the Gyeonggi metamorphic complex were analyzed for twenty-two elements by wet-chemical, X-ray fluorescence and emission-spectroscopic methods. Trace-element analyses of the magnetites from the Yangyang mine were compared to those from a deposit of magmatic-segregation type and from six Precambrian sedimentary magnetite deposits found elsewhere in Korea. It is suggested that the magnetite ore may have been derived by metamorphism of iron-rich sediment originally deposited in an environment of pelite-carbonate sedimentation.
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