남극 킹죠지섬 필데스반도의 화산암류에 대한 지구화학적 연구
(주)코리아스칼라
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- 2023.04.05
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- 1992.06
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서지정보
ㆍ발행기관 : 한국지구과학회
ㆍ수록지정보 : 한국지구과학회지 / 13권 / 2호
ㆍ저자명 : 좌용주, 이종익
영어 초록
Tertiary volcanic activity in the Fildes Peninsula can be divided into three stages (I, II, III) of magmatism. Evolutionary process of each stage was examined from the geochemical characteristics. For stage I, olivine, orthopyroxene and clinopyroxene of low Fe/Mg ratio as well as Ca-plagioclase begin to crystallize and fractionate. Stage II magma, which is more differentiated than stage I magma, shows the fractionation of Ca-plagioclase and olivine and orthopyroxene of high Fe/Mg ratio. Stage III magma, which is slightly more differentiated than stage I magma but less than stage II magma, intruded into the area when stage II magmatism was weakened. The volcanic rocks on the Fildes Peninsula show, as a whole, tholeiitic natures. From the previous studies on Sr isotopic ratio, the origin of the volcanic magma in the area was assumed to be upper mantle. Accordingly, the volcanic rocks in the area were originated from tholeiitic magma which generated by the partial melting of upper mantle under island-arc environment.
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