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http://dx.doi.org/10.9719/EEG.2019.52.5.459

Eruption Types and Textures of Pyroclastics from the Jugam Scoria Deposits, Ulleung Island, Korea  

Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University)
Ahn, Ung San (World Heritage Office, Jeju Special Self-govering Province)
Lee, So Jin (Institute of Basic Sciences, Andong National University)
Oh, Kyung Sik (Division of New Material Engineering, Andong National University)
Publication Information
Economic and Environmental Geology / v.52, no.5, 2019 , pp. 459-469 More about this Journal
Abstract
We present a quantitative evaluation of density, vesicularity and microtextures for coarse lapilli collected from the Jugam Scoria Deposits, northeastern Ulleung Island. Lapilli from the deposits have modal vesicularities of 61% in the lower part and 67% in the upper part, and vesicle populations dominated by non-interconnected subround vesicles. Clasts of modal vesicularity have margin-parallel zonation, with subaerially quenched rims interpreted to preserve "syn-fragmentation" magmatic textures in microlite-free sideromelane rims, grading "post-fragmentation" tachylitic interiors with vesicle and microlite textures that progressively coarsen from rim to interior. Degassing scenarios are linked to syn-fragmentation vesicle textures to demonstrate that the magmas degassed in dominantly closed systems. And diffusion-controlled cooling rates of trachyandesitic pyroclasts in contact with atmosphere are linked to post-fragmentation evolution of vesicle and microlite textures to infer about transportation and dispersal of the pyroclasts in low shooting jets. These textural analyses show that the Jugam eruptions were strictly applied to the strombolian type, analogous to the hawaiian type among any classical subaerial eruption type.
Keywords
Jugam Scoria Deposits; lapilli; vesicularity; microtexture; strombolian eruption;
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