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NTIS 바로가기광물과 암석 = Korean journal of mineralogy and petrology, v.33 no.3, 2020년, pp.165 - 173
박한범 (연세대학교지구시스템과학과) , 김진욱 (연세대학교지구시스템과학과)
The activity of living microorganism directly or indirectly affects to the biomineralization in sediments and rocks that display the unique biotic structure. Minerals in the biotic structures showed unique properties and bypass the thermodynamic and kinetic barriers. Therefore, investigations on the...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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망간각의 특징은 무엇인가? | 망간각은 성장속도가 대략 2 mm/Ma로 매우 느리기 때문에, 주변 환경변화로 인한 층의 변화가 뚜렷한 것이 특징이다(Hein and Koschinsky, 2014). 본 연구에 사용한 망간각 시료 역시 비교적 잘 부서지는 조직(crumbled texture)을 보이며, 다공성(porous) 특성을 보이는 층과, 단단하고 조밀한 조직(blocky and dense texture)을 보이는 층으로 구분이 되었다. | |
코콜리드 화석군집에서 관찰되는 코콜리드의 구성적 특징은 무엇인가? | 코콜리드 화석군집은 다공성층에서도 일부 나타났지만, 조밀한 조직을 보이는 층에서 더욱 우세하게 나타났다. 코콜리드는 10 μm내외의 크기를 보이며, 에너지 분산 X선 분석 결과 칼슘(Ca), 인(P). 플루오르(F)가 나타나는 칼슘 플루오르인회석(calcium fluorapatite; CFA)광물로 구성된 것을 확인하였다. 코콜리드는 대양에 분포하는 식물성 플랑크톤의 한 종류로, 3400 만년(34 Ma) 및 2300 만년(23 Ma) 전, 해수의 온도가 높았던 시기에 특징적으로 우세하게 분포하였던 것으로 알려져 있어, 이와 관련된 생물기원구조를 기준층(key bed)으로 사용할 수 있다. | |
망간각 시료 전체에 대하여 주요하게 보이는 생물기원구조에는 무엇이 있는가? | , 2018), 추가적으로 이와 다른 모양 및 조직을 보이는 특징적인 생물기원구조도 관찰되었다. 망간각 시료 전체에 대하여 주요하게 보이는 생물기원구조로써, 1 μm–5 μm의 크기의 타원체 모양(ellipsoidal shaped) 및 캡슐 모양(capsule shaped) 생물기원구조가 관찰되었고(Fig. 2a and b), 타원체 및 캡슐 모양의 생물기원구조와 함께 무작위하게 분포된 직경 1 μm 미만의 원통형의 빈 공간(sub-micron cylindrical void space)을 보이는 시스 모양의 튜브(sheath-like tube) 구조가 관찰되었다(Fig. 2c and d). |
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