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(Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 660-701, Korea):         ,            .         ,     .         .    ,       ,  mm    . -      ,     .     ,          .        , ,            .:, , , , , ABSTRACT : Diagenetic black chert nodules occur in the Paleozoic dolostone in Susan, Jecheon, Korea. They reacted with dolomite to form alteration rim around the nodules during the contact metamorphism probably related to the intrusion of biotite granite. In the earlier stage of alteration, talc and calcite replaced both the chert and dolomite, which were subsequently replaced by tremolite. Significant mass of tremolite occurs along the horizon enriched with chert nodules. Scanning electron microscopy and optical microscopy of the tremolite specimens revealed the elongated morphology of diverse aspect ratios coexisting in several mm scale. Non-asbestiform tremolite columns were also common as well as asbestiform fibrous bundles. Quantitative estimation of asbestos should be more cautious for naturally occurring materials because all the tremolite particles in the outcrop are not asbestiform. The occurrence of asbestiform tremolite in the Susan area indicates that a combination of chert-bearing dolostone, heat source, and aqueous fluids is one of the geological environments for the formation of asbestiform tremolite.Key words : Dolomite, chert, tremolite, asbestos, electron microscopy, morphology

Asbestiform Tremolite Formed by Chert-Dolomite Reaction and Its Morphological Characteristics