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Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula

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Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula
Other Titles
한반도 초염기성 포획암의 산소동위원소 비율
Lee, Jeong-A
Choo, Mi Kyung
Lee, Jong Ik
Kim, Kyu Han
Environmental Sciences & Ecology
Ultramafic Xenoliths; geochemical characteristics; equilibrium temperature; equilibrium pressure; oxygen isotopic ratios
Issue Date
Lee, Jeong-A, et al. 2013. "Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula". The Korean Earth Science Society, 34(1): 28-40.
This study examined the geochemical characteristics, equilibrium temperature and pressure conditions, and oxygen isotopic ratios of mantle xenoliths from the various geological sites of the Korean peninsula. The results are as follows: (1) The ultramafic xenoliths from the Korean peninsula mainly consist of typical high magnesium olivine (MgO : 49.12-50.95 wt.%, Mg value: 90.1-92.2), corresponding to worldwide Cenozoic ultramafic xenoliths in chemical compositions. (2) The pressure-temperature conditions of ultramafic xenoliths in the Korean peninsula are from 854 to 1016℃ and 4.6 to 24.4 kbar. (3) The oxygen isotopic ratios (δ18O) for olivines in ultramafic xenoliths range from 5.06 to 5.51, which are relatively uniform oxygen isotopic values and overlapped by the values of N-MORB and upper mantle peridotite (δ18O: 5.2±0.2). However, olivines of the ultramafic xenoliths from the Baegdusan and Chejudo have a relatively wide δ18O values ranging from 5.07 to 5.51 and 5.07 to 5.45, respectively. Based on the results, this study suggests that the high δ18O signature of the Baegdusan xenoliths give a hint that ~5% of the oxygen in typical EM2 sources originally derived from recycled sediments.
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