암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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백두산 지역의 마이오세 알칼리 현무암에 포획된 페리도타이트의 암석학적/지화학적 특성

Petrology and Geochemistry of Peridotite Xenoliths from Miocene Alkaline Basalt Near the Mt. Baekdu Area

  • 김은주 (부산대학교 지질환경과학과) ;
  • 박근영 (부산대학교 지질환경과학과) ;
  • 김선웅 (부산대학교 지질환경과학과) ;
  • 길영우 (전남대학교 에너지자원공학과) ;
  • 양경희 (부산대학교 지질환경과학과)
  • Kim, Eunju (Department of Geological Sciences, Pusan National University) ;
  • Park, Geunyeong (Department of Geological Sciences, Pusan National University) ;
  • Kim, Sunwoong (Department of Geological Sciences, Pusan National University) ;
  • Kil, Youngwoo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Yang, Kyounghee (Department of Geological Sciences, Pusan National University)
  • 투고 : 2017.09.05
  • 심사 : 2017.10.24
  • 발행 : 2017.12.31
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초록

백두산 지역 중기 마이오세 알칼리현무암에 포획된 페리도타이트 포획암은 주로 첨정석 레졸라이트로 조립질의 원생입상 조직을 보인다. 이 포획암들은 감람석을 치환하는 이차기원의 사방휘석과 감람석 결정입자의 경계를 따라 멜트(즉, 유리)를 산출하고 있다. 백두산 페리도타이트 포획암의 감람석, 사방휘석 그리고 단사휘석은 높은 Mg#(90~92), 첨정석의 Cr#는 11~29를 나타낸다. 백두산 페리도타이트 포획암의 주성분원소 성분은 심해 페리도타이트의 특성을 나타낸다. 단사휘석은 불호정성 미량원소에 부화되어 있으며, 두 종류의 미량원소 패턴을 보여준다.: (1) 경희토류원소가 결핍된 형태($(La/Yb)_N=0.1{\sim}0.2$, $(La/Ce)_N=0.4{\sim}0.8$). (2) 경희토류원소가 부화된 형태($(La/Yb)_N=2.2{\sim}3.8$, $(La/Ce)_N=1.2{\sim}1.6$). 계산된 평형 온도와 산소 분압은 각각 $920{\sim}1050^{\circ}C$와 ${\Delta}fO_2(QFM)=-0.8{\sim}0.2$이다. 백두산 페리도타이트 포획암들은 최대 15% 정도의 마그마를 만들고 난 후 맨틀에 남아있는 잔류 암석으로, 그 이후 실리카와 경희토류원소에 부화된 유체(혹은 멜트)에 의해 다양한 정도의 모달/은폐 교대작용을 경험하였음을 반영하고 있다.

Peridotite xenoliths in middle Miocene alkaline basalt from the Mt. Baekdu area are mainly anhydrous spinel lherzolites, displaying coarse-grained protogranular texture. These xenoliths have late-stage secondary orthopyroxene replacing olivine as the metasomatic mineral and glass formed along the grain boundaries. The studied xenoliths are characterized by the high $Mg{\sharp}[=100{\times}Mg/(Mg+Fe_{total})$ atomic ratio] of olivine, orthopyroxene and clinopyroxene (89~92) and the $Cr{\sharp}[=100{\times}Cr/(Cr+Al)$ atomic ratio] of spinel (10~29). Based on major-element data, the studied xenoliths are similar to those from the abyssal peridotites. Clinopyroxenes of the xenoliths are mostly enriched in incompatible trace elements, exhibiting two types of REE patterns: (1) LREE-depleted with $(La/Yb)_N$ of 0.1~0.2 and $(La/Ce)_N$ of 0.4~0.8. (2) LREE enriched with $(La/Yb)_N$ of 2.2~3.8 and $(La/Ce)_N$ of 1.2~1.6. The calculated equilibrium temperatures and oxygen fugacities resulted in $920{\sim}1050^{\circ}C$ and ${\Delta}fO_2(QFM)=-0.8{\sim}0.2$, respectively. It is suggested that the Mt. Baekdu peridotite xenoliths represent residues left after variable degrees of melt extraction(less than 15 vol%), which was subsequently subjected to different degrees of modal/cryptic metasomatism by silica- and LREE-enriched fluids (or melts).

키워드

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