암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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Skaergaard 암체의 감람석의 성분변화

Compositional Variation in Olivine in the Skaergaard Intrusion

  • 발행 : 2003.09.01
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초록

Skaergaard 암체의 감람석의 성분변화를 연구하기 위하여 Layered Series(LS), Upper Border Series (UBS), 및 Marginal Border Series(MBS)에서 산출되는 감람석의 성분을 분석하였다. 분화에 따른 원소조성변 화는 일반적으로 암체 전체에서 유사한 원소조성변화를 보여주는데 감람석의 FeO＊, Ti $O_2$, 및 MnO는 증가하고, MgO와 $SiO_2$는 감소하고, $Na_2$O, $K_2$O, A1$_2$ $O_3$, CaO, 및 P$_2$ $O_{5}$는 분화에 따른 주목할 만한 변화를 보이지 않는다. 분화과정의 전반에 걸쳐 Skaergaard 감람석은 어떠한 급격한 원소 변화 또한 보여주지 않는다. 따라서 마그마 분화에 따라 Skaergaard의 감람석이 체계적인 원소조성변화를 보이는 것으로 Skaergaard 마그마 분화 도중에 새로운 마그마의 주입의 가능성은 배제된다. 주목할 만한 급격한 원소변화가 MnO에서 관찰된다. Layered Series(LS) 감람석의 MnO 성분은 분화가 진행됨에 따라 꾸준히 증가하다가 UZc에서 급격히 감소하는데, 유사한 경향이 UBS, 및 MBS에서도 관찰된다. 이와 같이 Skaergaard 마그마 분화 말기에 관찰되는 감람석의 MnO 성분의 급격한 변화는 liquidus상으로 갑자기 출현하는 ferrobustamite에 기인한다.

Olivine from the Layered Series (LS), Upper Border Series (UBS), and Marginal Border Series (MBS) of the Skaergaard intrusion was analyzed to examine compositional variation. In general, olivine from all three series shows similar trends in major elements with differentiation: FeO＊ (total iron as FeO＊), Ti $O_2$, and MnO in the olivine, progressively increase, MgO and $SiO_2$progressively decrease, and Na$_2$O, K$_2$O, A1$_2$ $O_3$, CaO, and P$_2$O$\_$5/ remain unchanged at low abundances. No abrupt changes in the trends of major components in Skaergaard olivine are observed. The systematic compositional variations in Skaergaard olivine during differentiation preclude the possibility of any injection of new magma into the chamber during differentiation. Abrupt change in MnO, however, is observed in Skaergaard olivine during differentiation. MnO in Skaergaard olivine steadily increases with differentiation from LZ to UZc and then decreases in UZc of the LS and its equivalents of the MBS and UBS. The decrease of MnO in Skaergaard olivine during the final stage of differentiation is attributable to the abrupt and extensive appearance of ferrobustamite as a liquidus phase.

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