암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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포항 달전리 주상절리와 뇌성산 뇌록산지의 현무암 비교 분석

Petrological Study on Basaltic Rocks of the Daljeon-ri Columnar Joint and the Noeseongsan Noerok Site in Pohang, Korea

  • 김재환 (국립문화재연구소 자연문화재연구실) ;
  • 유영완 (국립문화재연구소 자연문화재연구실) ;
  • 정승호 (국립문화재연구소 자연문화재연구실) ;
  • 김태형 (국립문화재연구소 자연문화재연구실) ;
  • 문동혁 (국립문화재연구소 보존과학연구실) ;
  • 공달용 (국립문화재연구소 자연문화재연구실)
  • Kim, Jae hwan (Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Yu, Yeong-wan (Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Jung, Seung-Ho (Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Kim, Tae-Hyeong (Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Moon, Dong Hyeok (Conservation Science, National Research Institute of Cultural Heritage) ;
  • Kong, Dal-Yong (Natural Heritage, National Research Institute of Cultural Heritage)
  • 투고 : 2018.09.05
  • 심사 : 2018.10.30
  • 발행 : 2018.12.31
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초록

포항 달전리 주상절리(천연기념물 제415호)와 뇌성산 뇌록산지(천연기념물 제547호)는 중요한 지질 유산적 가치를 지니고 있기 때문에 두 지역의 현무암체에 대한 암석학적 연구를 수행하였다. 달전리 주상절리의 현무암은 감람석과 휘석이 반정으로 나타나며 침상의 사장석, 휘석, 불투명 광물 등이 기질을 이루는 반상조직을 보인다. 반면 뇌록산지의 현무암은 미정질의 기질에 사장석, 감람석, 휘석 반정을 함유하고 있으며, 사장석 반정이 특징적으로 나타난다. 또한, 전암대자율, XRD, XRF 분석 결과에서도 두 지역의 현무암은 서로 뚜렷이 구분되는 특성을 가진다. 화학분석 결과를 TAS와 Zr-Ti 다이어그램에 도시 결과, 전자는 대부분 알칼리 계열의 포노테프라이트(phonotephrite)의 조성을 가지며 판내부환경(within-plate basalt)에서 형성된 것으로 판단되며, 후자는 칼크-알칼리 계열의 현무암질 안산암 내지 안산암 조성을 가지며, 화산호(volcanic arc basalt)의 영역에 도시된다. 따라서 두 현무암은 기원 맨틀 물질에 차이가 있으며, 이러한 차이는 신생대 마이오세의 지체구조 환경 변화에 기인한 것으로 판단된다.

The basaltic rocks of Daljeon-ri columnar joint (Natural Monuments # 415) and Noeseongsan Noerok site (Natural Monuments # 547) were analysed in order to understand basalt types of two areas. The basaltic rocks of the Pohang Daljeon-ri columnar joint show a typical porphyritic texture containing phenocrysts (olivine and clinopyroxene) and groundmasses composed of clinopyroxene, plagioclase, and opaque minerals,. In contrast, basaltic rocks of Noeseongsan Noerok are characterized by fine-grained groundmass with large phenocrysts of plagioclase. Other analysis such as magnetic susceptibility, X-ray diffraction and X-ray fluorescence also support the petrological differences of two basalt rocks. The Daljeon-ri basaltic rocks are plotted on phonotephrite volcanic rocks of alkaline series in TAS(total alkali silica), and on within plate basalt in Zr-Ti diagram. The Noeseongsan basalts, on the other hand, are plotted on basaltic andesite to andesite of sub-alkaline series in TAS, and on volcanic arc basalt in Zr-Ti diagram. These results indicate that the original mantle materials between two basalt rocks were different each other, which probably originated from the change of a tectonic setting in the southeastern Korean peninsula during the Miocene.

키워드

HGOSBQ_2018_v27n4_185_f0001.png 이미지

Fig. 1. Location and panoramic photograph of the Pohang Daljeon-ri columnar joint (b), Occurrence of Noerok (c) and Pohang Blue-velley construction site (d).

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Fig. 2. Regional geologic and structural map of the Miocene basin province in southeast Korea (a) and geological map of the Pohang (b) and Janggi (c) basins with sampling site (●).

HGOSBQ_2018_v27n4_185_f0003.png 이미지

Fig. 3. Outcrop photographs of Pohang Daljeon-ri columnar joint and around the Noeseongsan. (a~d) Pohang Daljeon columnar joint (e, f) Occurrence of Noerok in Noeseongsan (g) Noerok in Pohang Blue-velley construction site (h) dacitic tuff in the Janggi Basin.

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Fig. 4. Comparison of magnetic susceptibility for the Pohang Daljeonri columnar joint and the Noeseongsan Basaltic rock.

HGOSBQ_2018_v27n4_185_f0005.png 이미지

Fig. 5. Microscope photograph of the Pohang Daljeon-ri columnar joint and basaltic rocks. (a) Pohang Daljeon-ri columnar joint, (b) Occurrence of the Noerok in Noeseongsan, (c) Pohang Blue-velley construction site.

HGOSBQ_2018_v27n4_185_f0006.png 이미지

Fig. 6. X-Ray analysis results of the Pohang Daljeon-ri columnar joint (a) and the Noeseongsan Basaltic rocks (b). Ac: analcime, Py: clinopyroxene, Cc: Clinochlorite, A-f: akali-feldspar, Bt: biotite, Mo: montmorillonite, An: andesine.

HGOSBQ_2018_v27n4_185_f0007.png 이미지

Fig. 7. Plot of Na2O+K2O vs. SiO2 (a) and tectonomagmatic discrimination of the Pohang Daljeon-ri columnar joint and Noeseongsan basaltic rock (b).

Table 1. Chemical composition of the Pohang Daljeon-ri columnar joint and Noeseongsan basaltic rock

HGOSBQ_2018_v27n4_185_t0001.png 이미지

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