The University of Tokyo · Earth and Planetary Sciences
카토 요시히로 교수의 연구실은 고대 해양 환경과 극한 환경에서의 원소 순환을 중심으로, 퇴적암, 특히 붕백철광조직(BIF), 금속 함유 퇴적물, 희토류 원소(REE)를 포함한 희귀광물의 고체화학적 특성과 그 기원을 규명하는 데 중점을 두고 있습니다. 특히 고생대 및 고원생대의 해저 화산 활동과 수열 화학, 해양 산소화 역학, 그리고 극도로 높은 희토류 원소 농도를 지닌 심해 mud의 형성 기작을 다룹니다. 이는 천체의 기후 변화와 지구의 산소화 과정, 그리고 미래 자원 개발 가능성을 연결짓는 다학제적 연구입니다.
Figures are computed from collected data and may differ slightly.
Metalliferous umbers and red shales occur as unique products of the Kula‐Pacific ridge‐forearc collision in the Late Cretaceous Shimanto Supergroup, an accretionary complex in Japan. These umbers are closely associated with greenstones of mid‐ocean ridge basalt (MORB) origin and are regarded as hydrothermal metalliferous precipitates related to MOR‐type volcanism. The umbers and red shales were deposited in the trench area where both terrigenous detritus from land and hydrothermal metalliferous
Rare earth element (REE) analyses of Precambrian banded iron formations (BIFs) show that distinct negative Ce anomalies, although rather weak or moderate (Ce/Ce* = 0.5–0.9), are commonly present in Algoma-type BIFs of the Early and Middle Archean, and even in the 3.8–3.7 Ga Isua iron formation (IF). This indicates that the seawater columns from which the BIFs precipitated were not entirely anoxic and that Ce oxidation mechanisms already existed in the 3.8–3.7 Ga oceans. The presence of pronounce
Abstract: Major and rare earth element contents are reported for Late Archean banded iron formations (BIFs) in the Bababudan Group of the Dharwar Craton, South India. The BIFs are mostly composed of SiO 2 (average1ρ = 54.88.1 wt%) and Fe 2 O 3 * (44.38.2 wt%). The Al 2 O 3 and TiO 2 contents are remarkably low, suggesting that detrital components were starved during the BIF deposition. The BIFs have a LREE‐enriched pattern with a relatively high (La/Yb) N (6.644.07). Total REE concentrations (RE
Deep-sea mud enriched in rare-earth elements and yttrium (REY-rich mud) has been recognized as a new resource for REY and scandium (Sc). Recently, highly REY-rich mud with more than 2,000 ppm of REY was found in the western North Pacific Ocean. The high REY content was attributed to enhanced deposition of fish debris, which acts as a host for REY, resulting from fish proliferation caused by topographically induced upwelling of nutrients. To investigate the spatial extent of the highly REY-rich m
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