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NTIS 바로가기한국지구과학회지 = Journal of the Korean Earth Science Society, v.34 no.4, 2013년, pp.313 - 328
위수민 (한국교원대학교 지구과학교육과) , 김지영 (운암고등학교) , 임성만 (한국교원대학교 지구과학교육과)
Jurassic granitoids in the northeastern part of the Yeongnam Massif are possibly the result of intensive magmatic activities that occurred in response to subduction of the proto-Pacific plate beneath the northeast portion of the Eurasian plate. Geochemical studies on the granitic rocks are carried o...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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한반도 중생대 화성활동을 지체구조적 관점에서 보면 무엇과 밀접한 관련이 있는가? | 한반도 중생대 화성활동은 지체구조적 관점에서 동북아시아의 형성과 밀접한 관련이 있다. 고생대 말에서 쥐라기 초기(250-210 Ma)에 걸쳐 아시아판의 형성 이후 220-180 Ma 사이에 아시아대륙 아래로 이자나기(Izanagi)판의 해령 섭입이 일어나면서 남중국과 한반도 및 일본에서는 활발한 화성활동이 일어났으며(Maruyama, 1997; Choi et al. | |
영남육괴 북동부에 분포하는 쥐라기 심성암체은 무엇에 의한 결과물인가? | 영남육괴 북동부에 분포하는 쥐라기 심성암체들은 유라시아대륙의 동북부지역 아래로 고태평양판의 섭입에 의해서 야기된 활발했던 화성활동의 산물이다. 지화학적 연구를 통하여 이 지역에 분포하는 화강암류의 성인과 지구조환경을 유추하여 보았다. | |
울진 지역 화강암류에 대한 주성분원소, 미량원소, 희토류원소에 대한 지화학적 특징으로 유추한 마그마의 유형 및 성인 그리고 지구조적인 환경은 어떠한가? | 1. 울진 지역의 중생대 쥐라기 화강암류는 비알칼리암 중 칼크-알칼리계열의 I-type 화강암류로, 마그마의 대부분이 metaluminous의 특성을 가진다. 주성분 원소와 미량원소 및 희토류원소의 함량 및 분화 경향은 전형적인 대보화강암의 범위에 해당되지만, 지역별로 분화에 따른 변화도의 기울기를 비교했을때, 일정한 SiO2 함량 범위 내에서 차이를 보이므로 이들 화강암류가 동일 기원 마그마의 가능성은 배제된다. 2. 울진 지역의 화강암류는 높은 SiO2, Al2O3 및 Sr의 함량과 낮은 MgO, Y, Yb의 값을 가지며 미량 원소와 희토류원소의 특성은 일본의 Hida belt내의 Yatsuo심성암체와 비슷하며, Sr/Y vs. Y과 La/Yb vs. Yb 판별도에서 아다카이트의 영역에 도시되는 등 아다카이틱한 특성을 보인다. 3. 조구조 판별도에 도시해 본 결과, 울진 지역은 화산호(VAG) 또는 동시 충돌형(syn-COLG) 화강암에 해당되며, 중생대 트라이아스기 말에서 쥐라기 초기에 고태평양판의 섭입환경에 의하여 동북아시아에서 일어난 대보화성활동의 영향으로 대륙주변부의 환경에서 생성되었음을 시사한다. |
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