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U-Pb(SHRIMP) and K-Ar Age Dating of Intrusive Rocks and Skarn Minerals at the W-Skarn in Weondong Deposit

원동 중석 스카른대에서의 관입암류와 스카른광물에 대한 U-Pb(SHRIMP) 및 K-Ar 연대

  • Received : 2013.08.26
  • Accepted : 2013.09.27
  • Published : 2013.09.30

Abstract

The geology of the weondong deposit area consists mainly of Cambro-Ordovician and Carboniferous-Triassic formations, and intruded quartz porphyry and dyke. The skarn mineralized zone in the weondong deposit is the most prospective region for the useful W-mineral deposits. To determine the skarn-mineralization age, U-Pb SHRIMP and K-Ar age dating methods were employed. The U-Pb zircon ages of quartz porphyry intrusion (WD-A) and feldspar porphyry dyke (WD-B) are 79.37 Ma and 50.64 Ma. The K-Ar ages of coarse-grained crystalline phlogopite (WD-1), massive phlogopite (WDR-1), phlogopite coexisted with skarn minerals (WD-M), and vein type illite (WD-2) were determined as $49.1{\pm}1.1$ Ma, $49.2{\pm}1.2$ Ma, $49.9{\pm}3.6$ Ma, and $48.3{\pm}1.1$ Ma, respectively. And the ages of the high uranium zircon of hydrothermally altered quartz porphyry (WD-C) range from 59.7 to 38.7 Ma, which dependson zircon's textures affected by hydrothermal fluids. It is regarded as the effect of some hydrothermal events, which may precipitate and overgrow the high-U zircons, and happen the zircon's metamictization and dissolution-reprecipitation reactions. Based on the K-Ar age datings for the skarn minerals and field evidences, we suggest that the timing of W-skarn mineralization in weondong deposit may be about 50 Ma. However, for the accurate timing of skarn mineralization in this area, the additional researches about the sequence of superposition at the skarn minerals and geological relationship between skarn deposits and dyke should be needed in the future.

Keywords

Weondong deposit;zircon U-Pb (SHRIMP) age dating;K-Ar age dating;high Uranium zircon;zircon metamictization texture;zircon dissolution-reprecipitation texture

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  2. Spectral characteristics of minerals associated with skarn deposits: a case study of Weondong skarn deposit, South Korea vol.20, pp.2, 2016, https://doi.org/10.1007/s12303-015-0043-0
  3. Skarn zonation and rock physical properties of the Wondong Fe-Pb-Zn polymetallic deposit, Korea vol.19, pp.4, 2015, https://doi.org/10.1007/s12303-015-0017-2
  4. Oscillatory zoning in skarn garnet: Implications for tungsten ore exploration vol.89, 2017, https://doi.org/10.1016/j.oregeorev.2017.08.003
  5. Recrystallization and hydrothermal growth of high U–Th zircon in the Weondong deposit, Korea: Record of post-magmatic alteration vol.260, 2016, https://doi.org/10.1016/j.lithos.2016.05.026
  6. Reactivated Timings of Yangsan Fault in the Sangcheon-ri Area, Korea vol.49, pp.2, 2016, https://doi.org/10.9719/EEG.2016.49.2.97

Acknowledgement

Supported by : 한국지질자원연구원