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| Abstract |
The Ryôke metamorphic terrain of the Yanai area, Southwest Japan, consists of non-metamorphosed sediment zone, biotite schist zone, and banded gneiss zone, and the older Ryôke granodiorites and the yo...unger Ryôke granites. Zircon overgrowths sometimes found in the zircon concentrates from granitized banded gneisses and granitic rocks are divided into three types according to morphological forms of core and shell: O-A, O-B, and O-C. The relations between the overgrowth type and the enclosing rock type as well as characteristic features of each overgrowth type were examined in detail. These investigations. reveal that the zircon overgrowths were originated by mixing, in a broad sense, of sediments and granitic liquids and by the subsequent contamination of granitic magma, and that characters of the overgrowth may indicate the conditions of mixing and contamination.show more
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| Table of Contents |
1.Introduction 2.Acknowledgements 3.Outline of Geology 4.Methods 5.General Characters of Zircon 6.Overgrowths of Zircon 7.Consideration 8.Reference Cited
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