韓國 北東部地域 原生代의 火成活動과 變成作用

• 영문명: Magamtism and metamorphism of the proterozoic in the northeastern part of Korea : tectonomagmatic characteristics of the Imgye hornblendites
• 발행기관: 대한자원환경지질학회
• 저자명: Ho Wan Chang(張浩完) Dong Hwa Lee(李東和)
• 간행물 정보: 『자원환경지질』26권 4호, 499~505쪽, 전체 7쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1993.08.30

영문 초록

The Imgye hornblendites occur as intrusive sills or dykes within the mylonite zone developed along the contact boundary between Precambrian Jungbongsan granite and Cambrian Jangsan quartzite or Myobong slate formations. The hornlendites belong to the subalkaline and tholeiitic series. In tectonomagmatic discrimination diagrams such as TiO₂-K₂O-P₂O₅, 2Nb-Zr/4-Y and TiO₂-10MnO-10P₂O₅, the hornblendites are classified into continental- and island-arc tholeiites. The hornblendites show fractionated REE patterns with (La/Yb)CN ranging from 3.73-4.56. In incompatible element abundance variations, the hornblendites show distinctive positive and negative anomalies for Rb and Nb, respectively, and unfractionated patterns of immobile incompatible elements such as Y and Yb. The REE patterns of the hornblendites are also similar to those of typical continental back-arc tholeiites and those of the Precambrian Okbang amphibolites in the Socheon-meon, Bonghwa-gun. Accoiding to geochemical characteristics above-mentioned, the hornblendites seem to have been formed from tholeiitic magmas of depleted upper mantle source, contaminated by crustal material en route to continental back-arc basin.

목차

ABSTRACT

序言

一般地質

岩石學的 考察

地球化學的 特徵

結論

참고문헌