The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Provenance Estimation on the Yeoncheon Samgeori Obsidian Artifacts

연천 삼거리 유적지 흑요석제 석기에 대한 산지 추정

  • Yi, Seonbok (Department of Archaeology, Seoul National Unviersity) ;
  • Jwa, Yong-Joo (Department of Geology and Research Institute of Natural Science, Gyeongsang National University) ;
  • Jin, Mi-Eun (Department of Geology and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kil, Youngwoo (Department of Energy and Resources Engineering, Chonnam National University)
  • 이선복 (서울대학교 고고미술사학과) ;
  • 좌용주 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 진미은 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 길영우 (전남대학교 자원공학과)
  • Received : 2019.11.27
  • Accepted : 2019.12.09
  • Published : 2019.12.31
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Abstract

We estimated the provenance of the obsidian artifacts from Samgeori site at Yeoncheon, one of the prehistoric sites in South Korea. Pyroxene microlites are of hedenbergite to augite compositions, and intergrown and/or overgrown with Fe-oxides showing poikilitic texture. Major oxides contents for the matrix of the obsidian artifacts exhibit a narrow compositional range, especially SiO2 contents being 73.0~75.5 wt.% of acidic rhyolitic composition. Also, rare earth element (REE) contents are relatively constant in the obsidian artifacts, and the chondrite-normalized REE patterns show a strong Eu negative anomaly. These mineralogical and geochemical features of the Samgeori obsidian artifacts were compared with those from both the Baekdusan obsidians and Japanese Kyushu obsidians which have been thought to be two major obsidian provenances around South Korea. It is suggested that the Samgeori obsidian artifacts were possibly originated from the Baekdusan obsidians.

우리나라 선사시대 유적지 중 하나인 연천 삼거리에서 출토된 흑요석제 석기에 대한 산지를 유추해 보았다. 삼거리 흑요석제 석기에 포함된 미세결정 중 산화광물과 휘석은 연정 내지 포이킬리틱 조직을 보이며, 휘석의 미세결정은 그 조성이 헤덴버자이트 내지 오자이트의 조성을 가진다. 기질에 대한 주성분 산화물의 함량에서 삼거리 흑요석제 석기는 좁은 범위의 일정한 값을 나타내며 SiO2 함량이 73.8~75.5 wt.%의 산성의 유문암 조성을 나타낸다. 기질의 희토류원소 함량 역시 일정하며 뚜렷한 Eu 음의 이상을 보인다. 삼거리 흑요석제 석기의 이러한 광물학적 및 지구화학적 특징을 우리나라 주변 흑요석 대표 산지인 백두산과 일본 규슈의 흑요석과 비교해 보았을 때, 흑요석제 석기의 원석이 백두산에서 유래되었을 가능성이 크다.

Keywords

References

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