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KMID : 0895420090190010039
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Journal of Korean Society of Occupational and Enviromental Hygiene
2009 Volume.19 No. 1 p.39 ~ p.50
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Occurrence types of asbestos within the serpentinite mines of the western part of Chungnam
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Song Suck-Hwan
Hwang Bum-Gu
Kim Hyun-Wook
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Abstract
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This study is for the occurrence types of asbestos within 2 serpentinite mines, Baekdong and Kwangsi, Chungnam. They were exploited as serpentinite mines for several decades and closed in the 1980’s. Asbestos with associated minerals were collected from the serpentinite bodies. They were examined with microscopes and FESEM, and analysed with EPMA, XRD and EDX to confirm for the types and/or compositions of the minerals. The serpentinites contain asbestos and nonasbestos minerals. Asbestos include chrysotile, tremolite and actinolite. The chrysotiles occur as veins of several ㎜ to cm thickness with random directions. The tremolite and actinolite occur along cracks and fractures of several ㎝ to ten ㎝ thickness. They show mineralogical characteristics showing common asbestos under the microscope. Non-asbestos including chrysotile, lizardite, antigorite, tremolite and actinolite were also found within the serpentinite. The serpentines form pseudomorphic mesh textures, and also show hourglass or ribbon textures. The tremolite and actinolite were formed from the alterations of the pyroxenes and amphiboles, and plot between tremolite and magnesio hornblende. Tremolitic grains are colorless and occur as commonly elongated grains whereas the magnesio hornblende grains mainly show light green and occur as subhedral to euhedral grains. Overall results suggest that three types of asbestos were found in the Baekdong and Kwangsi serpentinite mines with varieties of the occurrences. Based on the occurrence types for the asbestos, additional studies are required for the asbestos of the top soil and the air.
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KEYWORD
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Chungnam, serpentinite, chrysotile, tremolite, actinolite
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