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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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A large anorthositic mass outcropped as mushroom-like body extending up to 46km which occurs in the Hadong kaoline district of southern Korea. The anorthositic mass is in contact with the metamorphic, plutonic and sedimentary rocks. The metamorphic rocks are of granitic gneiss and banded gneiss, etc; the plutonic rocks are of gabbroic and dioritic rocks, schistose granite, syenite, diorite and granite. The sedimentary rocks include siltstone and pebbly sandstone of Lower Gyeongsang System, Cretaceous in age. The anorthositic mass shows a gradational contact with the metamorphic and sedimentary rocks, and is cut by the plutonic rocks except gabbroic and dioritic rocks. The anorthositic mass is leucocratic in the central portion of the mass, and, in turn, grades to rock phases in which ma/ic minerals are irregularly scattered, then to the well-lineated rock and finally to the banded gneiss. Lineation of the anorthositic mass is accordant with that of the surrounding banded gneiss, and the lineation continues toward the gneiss. In some places, the rock phases in which mafics are scattered is gradational with adjacent sedimentary rocks. The anorthositic mass in contact with gabbroic and dioritic rocks shows spotted features. Various replacement features seen under the microscope and paragenetic sequence of the mineral components in the anorthositic rocks cannot be considered as the origin of magmatic crystallization. From the field and microscopic observations, it is concluded that the anorthositic mass was formed from replacement of the metamorphic rocks and plutonic rocks by the anorthositic magma.
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