Reactivated timings of the yangsan fault in the yeonghae area based on the mineralogical characteristics of fault clays

Seongsik Hong, Ho Sim, Sung Ja Choi, Yungoo Song

Research output: Contribution to journalArticlepeer-review

Abstract

We present the K-Ar age dating results of 0.1um fraction of the selected fault rocks from the Yangsan fault in the Yeonghae area. Based on the mineralogical characterization, the 0.1um 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 0.1um fractions. Accordingly, the activation timings of Yangsan Fault in the Yeonghae area were determined as 45.51.1 Ma, 50.91.2 Ma, 58.21.3 Ma, 60.81.4 Ma, 65.31.6 Ma, 66.81.5 Ma, 67.11.5 Ma, and 75.11.7 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(75.11.7 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.

Original languageEnglish
Pages (from-to)645-654
Number of pages10
JournalEconomic and Environmental Geology
Volume53
Issue number6
DOIs
Publication statusPublished - 2020 Dec

Bibliographical note

Publisher Copyright:
© 2020 Korean Society of Economic and Environmental Geology. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)
  • Geology
  • Economic Geology

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