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http://dx.doi.org/10.9719/EEG.2020.53.6.645

Reactivated Timings of the Yangsan Fault in the Yeonghae area based on the Mineralogical Characteristics of Fault Clays  

Hong, Seongsik (Department of Earth System Sciences, Yonsei University)
Sim, Ho (Department of Earth System Sciences, Yonsei University)
Choi, Sung-Ja (Korea Institute of Geoscience and Mineral Resources)
Song, Yungoo (Department of Earth System Sciences, Yonsei University)
Publication Information
Economic and Environmental Geology / v.53, no.6, 2020 , pp. 645-654 More about this Journal
Abstract
We present the K-Ar age dating results of <0.1㎛ fraction of the selected fault rocks from the Yangsan fault in the Yeonghae area. Based on the mineralogical characterization, the <0.1㎛ fractions were mostly composed of 1Md illite polytype, or I-S interstratified mineral, which should be formed by fault activation. Therefore, we determined the timings of fault activation events by analyzing K-Ar age-dating for the <0.1㎛ fractions. Accordingly, the activation timings of Yangsan Fault in the Yeonghae area were determined as 45.5±1.1 Ma, 50.9±1.2 Ma, 58.2±1.3 Ma, 60.8±1.4 Ma, 65.3±1.6 Ma, 66.8±1.5 Ma, 67.1±1.5 Ma, and 75.1±1.7 Ma. These results indicate that at least 5-times of major fault events occurred in the Yangsan fault from late Mesozoic to Cenozoic Era. In the outcrop, age dating results tend to be younger age from the location of the oldest sample(75.1±1.7 Ma) toward to the both sides. From the results, it suggests that the fault activation extends from the location of oldest age saple to both sides. This geochronological research of the multiple fault activation ages for the Yangsan Fault will provide crucial information for establishing the tectonic evolution model in the southeastern part of the Korean Peninsula.
Keywords
fault activation; Yangsan fault; illite polytype; K-Ar age; fault gouge;
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