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CHIME Monazite Ages of Jurassic Foliated Granites in the Vicinity of the Gangjin Area, Korea  

Cho, Deung-Lyong (Division of Geology and Geoinformation, Korea Institute of Geoscience and Mineral Resources)
Kee, Weon-Seo (Division of Geology and Geoinformation, Korea Institute of Geoscience and Mineral Resources)
Suzuki, Kazuhiro (Center for Chronological Research, Nagoya University)
Publication Information
The Journal of the Petrological Society of Korea / v.16, no.3, 2007 , pp. 101-115 More about this Journal
Abstract
The CHIME (chemical Th-U-total Pb isochron method) dating on monazite was carried out for two foliated granites from a dextral ductile shear zone in the vicinity of Gangjin area, which is considered to be a southern extension of Sunchang shear zone. The result gives emplacement age of the medium-grained biotite granite and the coarse-grained biotite granite as $183.6{\pm}2.2Ma$(MSWD=0.21) and $171.7{\pm}4.0Ma$(MSWD=0.57), respectively. Microtextures of quartz and feldspar observed in the foliated granite are almost identical with those reported in Jurassic (ca 180 Ma) foliated granites from the Imsil-Namwon area of the Sunchang shear zone, and they constraint that the ductile deformation took place at temperature condition of $300{\sim}550^{\circ}C$. Assuming cooling curves of the foliated granites in this study are similar with those of Jurassic foliated granites from Imsil-Namwon area, dextral ductile shear in the Gangjin area would take place between 172 Ma and 150 Ma, about 10 Ma later than the previous estimation based on CHIME monazite ages.
Keywords
CHIME age dating; monazite; Sunchang shear zone; foliated granite; mylonitization;
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