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Chemical Weathering of Hornfels Pebbles in the Marine Terrace Deposits, Yangnam-Myon, Gyeongju  

정기영 (안동대학교 지구환경과학과)
이봉호 (안동대학교 지구환경과학과)
Publication Information
Journal of the Mineralogical Society of Korea / v.17, no.1, 2004 , pp. 85-97 More about this Journal
Abstract
Weathering of hornfels pebble in the marine terrace deposits, Yangnam-Myon, Gyeongju was investigated by X-ray diffraction, scanning electron microscopy, and chemical analysis. In the early stage of weathering, only plagioclase was leached leaving pores. With progress of weathering, biotite and chlorite were tranformed to hydrobiotite and chlorite-vermiculite, respectively. Quartz, K-feldspar, and muscovite were not altered. Thickness of weathering rinds and their mineralogical characteristics were different between terraces of different elevations. In the lower second terrace, the weathering of pebble was dominated by the decomposition of plagioclase, while in the upper third terrace, weathering was characterized by the transformation of biotite and chlorite with precipitation of halloysite from the weathering of plagioclase. Thickness of weathering rind and weathering products were varied even within the same terrace deposit probably due to local variation of drainage conditions.
Keywords
Quaternary; weathering; pebble; terrace; biotite; chlorite; halloysite;
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