2014; 47(5): 489-496

Published online October 31, 2014

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Occurrence and Mineralogical Characteristics of Asbestos in Dolostone at Ungdo, Seosan

Seon-ok Kim1, Minhee Lee2*, Hyunjung Jung2 and Wonji Shin2

1Department of Energy Resources Engineering, Pukyong National University, Busan 608-737, Korea
2Department of Earth Environmental Sciences, Pukyong National University, Busan 608-737, Korea

Received: September 12, 2014; Revised: October 25, 2014; Accepted: October 25, 2014

Abstract

The occurrence and mineralogical characteristics of asbestos in dolostone at Ungdo, Seosan were investigated by analyses of PLM, XRD, and SEM/EDS. Representative outcrops of dolostone at Ungdo were examined and four dolostone samples were collected according the occurrence type to identify the shape of asbestos in dolostone samples. The host rock of dolostone had been produced from the hydrothermal alteration and/or thermal metamorphism of which main source was assumed as the acidic granite. Tremolites were observed near the cracks or fractures of the dolostone as tamping or gob types. From the mineralogical analyses, main minerals of dolostone were dolomite with calcite, quartz, talc, amphibole, and pyroxene. From SEM/EDS analyses, tremolite-actinolite asbestoses were observed in dolostone and their shapes were prismatic and fibrous (less than 1 μm in width). Nonasbestos prismatic forms were also found and they would transfer to asbestos particles resulting from the cleavage and fracture of the prismatic particles. Overall results suggest that asbestoses in Ungdo dolostones were mainly tremolite-actinolite and they were originated from the hydrothermal alteration of Ca-Mg rich dolostone.

Keywords dolostone, tremolite, actinolite, asbestos, hydrothermal alteration

Article

2014; 47(5): 489-496

Published online October 31, 2014

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Occurrence and Mineralogical Characteristics of Asbestos in Dolostone at Ungdo, Seosan

Seon-ok Kim1, Minhee Lee2*, Hyunjung Jung2 and Wonji Shin2

1Department of Energy Resources Engineering, Pukyong National University, Busan 608-737, Korea
2Department of Earth Environmental Sciences, Pukyong National University, Busan 608-737, Korea

Received: September 12, 2014; Revised: October 25, 2014; Accepted: October 25, 2014

Abstract

The occurrence and mineralogical characteristics of asbestos in dolostone at Ungdo, Seosan were investigated by analyses of PLM, XRD, and SEM/EDS. Representative outcrops of dolostone at Ungdo were examined and four dolostone samples were collected according the occurrence type to identify the shape of asbestos in dolostone samples. The host rock of dolostone had been produced from the hydrothermal alteration and/or thermal metamorphism of which main source was assumed as the acidic granite. Tremolites were observed near the cracks or fractures of the dolostone as tamping or gob types. From the mineralogical analyses, main minerals of dolostone were dolomite with calcite, quartz, talc, amphibole, and pyroxene. From SEM/EDS analyses, tremolite-actinolite asbestoses were observed in dolostone and their shapes were prismatic and fibrous (less than 1 μm in width). Nonasbestos prismatic forms were also found and they would transfer to asbestos particles resulting from the cleavage and fracture of the prismatic particles. Overall results suggest that asbestoses in Ungdo dolostones were mainly tremolite-actinolite and they were originated from the hydrothermal alteration of Ca-Mg rich dolostone.

Keywords dolostone, tremolite, actinolite, asbestos, hydrothermal alteration

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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