Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Geochemical characteristics of Precambrian basement rocks in the Jukbyeon area, northeastern Yeongnam massif, Korea

영남육괴 북동부 죽변 지역 선캠브리아기 기반암류의 지구화학적 특징

Cheong, Chang-Sik;Kil, Young-Woo;Kim, Jeong-Min;Jeong, Youn-Joong;Im, Chang-Bock
정창식;길영우;김정민;정연중;임창복

  • Published : 20041200

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Abstract

The Jukbyeon area in northeastern Yeongnam massif primarily comprises an Early Proterozoic metasedimentary sequence(the Hosanri Formation) and peraluminous granitoids such as the Buncheon granite gneiss, biotite granite gneiss, and Hongjesa granite. The Zr contents and Rb/Sr ratios of the three peraluminous granitoids do not show consistent trends with $SiO_2$ contents. The Hosanri Formation shows a typical low pressure-high temperature metamorphic mineral assemblage, which is widespread in northeastern Yeongnam massif. The Rb-Sr and Pb-Pb whole rock ages of the Buncheon granite gneiss are respectively yielded as $1911{\pm}170\;Ma\;and\;1933{\pm}54\;Ma$, which are identical within error ranges. The Hongjesa granite also shows an Early Proterozoic Rb-Sr($1919{\pm}160\;Ma$) and Pb-Pb($1899{\pm}200\;Ma$) ages. The sedimentation age of the Hosanri Formation is constrained between its youngest Nd model age(c. 2.3 Ga, except two mantle-derived samples) and the intrusive age of the Buncheon granite gneiss(c. 1.9 Ga). The Late Archean to Early Proterozoic Nd model ages, and predominantly negative ${\varepsilon}_{Nd}$ values of the peraluminous granitoids confirm the existence and involvement of Archean crustal materials. The mantle input is, however, also indicated by positive ${\varepsilon}_{Nd}$ values in some samples. Recent studies consistently show that 2.1 - 1.8 Ga magmatic and metamorphic events are the most distinguishable both in the Gyeonggi and Yeongnam massifs, highlighting a close tectonic relationship of the two massifs with the Columbia, a pre-Rodinia supercontinent. The geochronological and metamorphic resemblance between the Gyeonggi and Yeongnam massifs and the Central Zone of the North China block leaves a possibility that the two Korean massifs have experienced tectonic events related to the Early Proterozoic continental collision in a global scale.

영남육괴 북동부 죽변 지역은 변성퇴적암인 호산리층을 최고기암으로 하여 그를 관입한 분천화강편마암, 흑운모화강편마암, 홍제사화강암 등이 기저를 이룬다. 원소 분석결과에 의하면 이들 세 고기 관입체는 $1.39{\sim}1.78$ 범위의 매우 높은 알루미늄 포화지수를 보여 과알루미늄질 화강암에 해당되며 Zr 농도나 Rb/Sr 비가 $SiO_2$ 성분과 체계적인 변화를 보이지는 않는다. 호산리층은 영남육괴 북동부의 다른 지역과 유사하게 전형적인 저압 고온형의 변성 광물 조합을 보인다. 분천화강편마암의 Rb-Sr 전암연대는 $1911{\pm}170$ Ma이고 납 동위원소 조성은 $1933{\pm}54\;Ma$의 전암연대를 보여 서로 오차범위 내에서 잘 일치한다. 홍제사화강암은 Rb-Sr, Pb-Pb 전암연대가 각각 $1919{\pm}160\;Ma,\;1899{\pm}200\;Ma$로 분천화강편마암과 함께 약 19억년 전의 화성활동 산물이다. 호산리층 시료 대부분의 Nd 모델연대는 약 23억년${\sim}$26억년 범위이며 분천화강편마암에 의해 관입되었으므로 약 23억년에서 19억년 전 사이에 퇴적된 초기 원생대 지층임을 알 수 있다. 호산리층 퇴적 이후 관입한 세 초기 원생대 관입체의 Nd 모델연대 중 일부는 호산리층보다 더 오래되어 이들 암체의 기원물질로 시생대 암석이 포함되었음이 확인된다. 연구 지역 기반암은 대부분 (-)의 ${\varepsilon}_{Nd}$ 값을 보이지만 일부 (+)의 값을 가지는 시료도 있어 기원물질로 기존에 존재하던 지각물질이 가장 중요하였지만 맨틀물질도 일부 개입하였다고 볼 수 있다. 최근의 연구 결과를 종합하면 약 21억년${\sim}$18억년 전의 화성 및 변성 활동이 영남육괴와 경기육괴에서 공히 가장 중요한 지구조적 사건으로 밝혀졌는데 아마도 콜롬비아 초대륙의 형성과 관련된 전 지구적 사건의 일환으로 이해되어야 할 것이다. 영남육괴와 경기육괴의 변성연대 및 변성암석학적 특징은 북중국의 Central Zone과 비교적 잘 대비되므로 이들의 성인은 초기 원생대의 대륙충돌과 연관되었을 가능성이 있다.

Keywords

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