Welded tuff infilling a volcanic vent at Weolseong,Republic of Korea |
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| Authors: | Antony John Reedman Ki Hwa Park Richard James Merriman Seon Eok Kim |
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| Institution: | (1) British Geological Survey, Bryn Eithyn Hall, Llanfarian, SY23 4BY Aberystwyth, Dyfed, UK;(2) Korea Institute of Energy and Resources, 219-5 Garibong-Dong, Guro Gu, 150-6 Seoul, Republic of Korea;(3) British Geological Survey, Keyworth, NG12 5GG Nottingham, UK |
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| Abstract: | A plug of parataxitically welded tuff, with an elliptical (700 × 400 m) cross section, crops out in Weolseong district, Republic of Korea. It intrudes late Cretaceous granodiorite and extrusive tuffs of the Chisulryoung Volcanic Formation and displays a steeply inclined welding foliation, concordant with the intrusive contacts, and a subvertical stretching lineation. These fabrics are interpreted as resulting from laminar shearing in a boundary layer during deposition of the tuff by agglutination along the walls of a vent which served as a feeder for extrusive ignimbrites. |
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