The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
권호 표지

Tholeitic volcanism in Cheju Island, Korea

제주도의 솔리아이트 화산활동

  • 박준범 (연세대학교 이과대학 지질학과) ;
  • 권성택 (연세대학교 이과대학 지질학과)
  • Published : 1996.06.01
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Abstract

We report petrography, mineral chemistry, and major and trace element chemistry for rare tholeiites in Cheju island where alkalic rocks predominate. Available age data indicate that the tholeiitic magmatism was younger than 0.49Ma, possibly younger than 0.17 Ma. The tholeiites are generally fine-grained, porphyritic rock and show intergranular texture with lath-shaped plagioclase ($An_{61-46}$), orthopyroxene (bronzite) and olivine ($Fo_{78-67}$). Characteristically, two kinds of clinopyroxene (pigeonite and augite) occur only in groundmass. The tholeiites have normative quartz and show limited compositional variations ($SiO_2$=51.0-52.5 wt%; Mg＃=54-60). Major and transitional metal element variations of tholeiites are distinct from those of alkaline rocks in MgO diagram, suggestingthat the two rock types cannot be simply related to differentiation process from the same magma. The ratios among $K_2O$, Rb, Ba, Nb and La are similar for both tholeiites and alkali basalts, however the ratios between the elements (P, Y and Yb) having an affinity with garnet and the above elements are higher for tholeiites than for alkali basalts. These trace element ratios suggest that the tholeiites and alkali basalts were produced by different degrees of partial melting from a similar sources material (garnet lherzolite mantle).

이 연구는 알칼리 화산도로 특정지워진 제주도의 동부 성읍리, 서부 한림읍 이사돌 그리고 한경면고산리 지구내 해안에 분포하는 수매의 솔리아이트에 대한 암석기재, 광물화학, 주성분 및 미량성분 원소의 화학자료를 보고한다. 이들은 주로 반상조직인 알칼리암류에 비해 세립질이며, 주상 혹은 침상의 사장석 ($An_{61-46}$)과 사방휘석(브론자이트) 및 감람석($Fo_{78-67}$)이 입자간 조직을이룬다. 특징적으로 사방휘석이 반자형의 반정 혹은 미반정으로 산출되고, 두 유형의 단사휘석(피저나이트와 보통 휘석)은 석기 광물로만 산출한다. 이들 솔리아이트는 노옴 석영을 가지며, 주성분 원소의 변화 범위는 좁다(SiO2=51.0-52.5 wt%; Mg#=54-60). 주성분 원소와 전이금속 원소의 변화경향이 알칼리암ㄹ와 두드러진 것은 동일 마그마의 분화로 솔리아이트와 알칼리암의 관계를 설명할 수 없다는 것을 시사한다. 한편, $K_2O$, Rb, Ba, Nb, La들 간의 비는 솔리아이트와 알칼리암이 유사한 반면, P, Y, Yb 등 석류석과 친화적인 원소와 이 원소들 간의 비는 솔리아이트가 알칼리암보다 크다. 이러한 미량원소 특징은 제주도의 솔리아이트와 알칼리 현무암류는 동질 기원이나 부분용융정도가 다른 모마그마로부터 유래되었음을 시사한다.

Keywords

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