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http://dx.doi.org/10.7854/JPSK.2017.26.1.1

The Late Cretaceous Emplacement Age of Masan Hornblende-Biotite Granite  

Lee, Tae-Ho (Division of Earth and Environmental Sciences, Pukyong National University)
Park, Kye-Hun (Division of Earth and Environmental Sciences, Pukyong National University)
Kim, Jeongmin (Division of Earth and Environmental Sciences, Korea Basic Science Institute)
Kim, Myoung Jung (Division of Earth and Environmental Sciences, Pukyong National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.1, 2017 , pp. 1-11 More about this Journal
Abstract
We have dated the K-Ar, Ar-Ar and U-Pb ages of the Masan hornblende-biotite granite in the southern Cretaceous Gyeongsang basin to constrain its emplacement age. The ~108 Ma hornblende K-Ar age obtained in the study is similar to the previously reported Rb-Sr age. However, the single grain total fusion $^{40}Ar/^{39}Ar$ dating on hornblende failed to yield statistically meaningful ages because the isotopic system was open during its alteration. Thus the hornblende K-Ar age in the study is also unlikely to be reliable. The single grain total fusion $^{40}Ar/^{39}Ar$ dating on biotite yielded an average age of $75.8{\pm}3.0Ma$. Apart from scattered data in the range of ~45-75 Ma, the average age increased to ~80 Ma. The SHRIMP and LA-MC-ICPMS U-Pb isotopic compositions of zircon from the Masan hornblende-biotite granite yielded its emplacement age as $87.6{\pm}2.7Ma$ and $86.8{\pm}0.4Ma$, respectively. It is thus likely that the ~80 Ma $^{40}Ar/^{39}Ar$ age of biotite might reflect the cooling age of Masan hornblende-biotite granite or the thermal influences from later intense igneous activities in the Gyeongsang basin.
Keywords
Masan hornblende-biotite granite; Gyeongsang basin; zircon U-Pb age; single grain total fusion $^{40}Ar/^{39}Ar$ age;
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