Stable Isotopic Compositions of Foraminifera of the Tidal Flat in the Gomso Bay of the Western Coast of Korea

서해안 곰소만 조간대 유공충의 안정동위원소 성분

The oxygen and carbon isotopic compositions of the foraminiferal species, Elphidirm dtigoense and Ammonia beccarii tepida, of the tidal flat in the Gomso Bay of the western coast of Korea have been measured. This work was intended to study the relationship between oxygen and carbon isotopic compositions of the foraminifera and present oceanographic environments, and also the difference between two foraminiferal species. The values of $\delta$/SUP 18/O and $\delta$/SUP 13/C of E. dtigoense varied from - 3.20% to + 0.58% and from - 5.26% to - 0.93%, respectively. The values of $\delta$/SUP 18/O and $\delta$/SUP 13/C of A. beccarii tepida varied from - 1.11% to + 0.61% and from - 2.04% to - 1.40%, respectively. Mo significant variations in these values occur from the samples among the upper, middle and lower tidal zones except for the one from the upper tidal zone that has extremely low value. The difference between the two foraminiferal species was 0.20% and 1.63% in the average values of $\delta$/SUP 18/O and $\delta$/SUP 13/C, respectively. The relationship between $\delta$/SUP 18/O and $\delta$/SUP 13/C values was positive in interspecies of two species.

이 연구에서는 곰소만 조간대의 현생 해양환경, 2종 (Elphidium etigoense와 Ammonia beccarii tepida)의 유공충의 산소 및 탄소 동위원소 성분비와의 관계, 그리 고 유공충 종간의 차이 등을 연구하였다. E. etigoense의 $\delta$/SUP 18/O값은 -1.11$\textperthousand$에 서 +0.61$\textperthousand$이고 $\delta$/SUP 13/C값은 -2.04$\textperthousand$에서 -1.40$\textperthousand$이다. 상부, 중부, 하부 조간대 사이의 차이는 없었으며 유공충 2종간에는 아주 낮은 측정값을 보여주는 시료 한 개를 제외하면 평균$\delta$/SUP 18/O 값의 차는 0.20%이고 평균 $\delta$/SUP 18/O값의 차는 1.63$\textperthousand$이 었다.