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Albitization of feldspar in the Cretaceous Kusandong Tuff, Korea  

Jeong, Jong-Ok (Department of Earth and Environmental Sciences and Research Institute of National Sciences, Gyeongsang National University)
Sohn, Young-Kwan (Department of Earth and Environmental Sciences and Research Institute of National Sciences, Gyeongsang National University)
Publication Information
The Journal of the Petrological Society of Korea / v.14, no.4, 2005 , pp. 195-211 More about this Journal
Abstract
The Kusandong Tuff, known as a representative key bed in the Cretaceous Gyeongsang Basin, is a crystal-rich tuff of pyroclastic flow and surge origin. It is 1-4 m thick and laterally extends for more than 200 km intercalated in the upper part of the Hayang Croup. Observations and analyses of the feldspar crystals in the tuff, using polarizing microscopes, EPMA, and BSE images, reveal that the plagioclase crystals in the tuff were completely albitized (>$97\%$ Ab) whereas those in the southernmost localities where the tuff is rich in fine ash matrix are unaltered or partly albitized. K-feldspars are partly albitized at all localities, irrespective of the matrix content of the tuff, Perthitic textures, chessboard twinning, albitization along micro-fractures and cleavages, and the relationship between matrix content and the degree of albitization suggest that feldspars in the Kusandong Tuff were albitized by Na-rich fluid after burial. Albitization is interpreted to start preferentially along micro-fractures and cleavages and be hampered in matrix-rich tuffs with a low permeability. Original composition of the plagioclases in the Kusandong Tuff is also interpreted to have ranged between oligoclase and andesine ($Ab_{62.5}-Ab_{83.3}$) before the albitization.
Keywords
Kusandong Tuff; Gyeongsang Basin; Albitization; Diagenesis; Ignimbrite;
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