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http://dx.doi.org/10.7854/JPSK.2017.26.2.153

Determination of Flow Direction from Flow Indicators and Lateral Grading in the Naeyeonsan Tuff, Northern Pohang, Korea  

Cho, Nam-Sik (Department of Earth and Environmental Sciences, Andong National University)
Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.2, 2017 , pp. 153-163 More about this Journal
Abstract
The Naeyeonsan Tuff is a stratigraphic unit which is distinguished as a cooling unit in the volcanic rocks of the northern Pohang. The Naeyeonsan Tuff, which is composed of crystals of plagioclase, quartz and hornblende, glasses of pumice and shard, and lithics of dacite, rhyolite, sandstone and shale, belongs to a lapilli tuff field according to the granulometric classification and to a vitric tuff field according to the constituent classification. The tuffs mostly develop welding foliations by dense welding and flatterning pumices and shards, and show several flow indicators by pyroclastic flowing. We can know a movement pattern from flow lineations and imbrications by pumices and lithics, and lateral gradings in isopleth map by average largest lithics and pumices in the Naeyeonsan Tuff, which indicate that the Naeyeonsan Tuff had a possible source area from the southeastern part.
Keywords
Flow indicator; Flow lineation; Movement pattern; Lateral grading; Possible source area;
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Times Cited By KSCI : 3  (Citation Analysis)
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