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A Study on the Metamorphism of Gneisses in the Northern Gohung Area, Chonnam  

Shin, Sang-Eun (Faculty of Earth System and Environmental Science, Chonnam National University)
Cho, Kye-Bok (Faculty of Earth System and Environmental Science, Chonnam National University)
Park, Bae-Young (Faculty of Earth System and Environmental Science, Chonnam National University)
Publication Information
Journal of the Korean earth science society / v.25, no.6, 2004 , pp. 443-473 More about this Journal
Abstract
In northern Gohung granitic gneiss, porphyroblastic gneiss and migmatitic gneiss are widely distributed. Gneisses were plotted in granodiorite domain on an lUGS silica-alkali diagram. The amounts of trace elements (Li, Zn, Sc, Sr, Ni, V Y etc.) vs. $SiO_2$, somewhat decreased. Plagioclase showed a wide compositional range ($An_{32-48}$). $X_{alm}$ and $X_{sps}$ were higher in garnet rim and $X_{pyp}$ in garnet core. The rocks in the study area were formed from S and I-type magmas which generated from syn-collision and the late to post-orogenic tectonic environment. Metamorphic P-T conditions u·ere low to medium pressure, high temperature (803-913$^{\circ}C$, 6.1-7.3 kb) and overprinted by retrograde metamorphism (570-726$^{\circ}C$, 2.2-5.1 kb) and chloritization.
Keywords
gneiss; trace element; syn-collision; metamorphic P-T condition; retrograde metamorphism;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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