A5000490619- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Mineral Processing and Grinding
- Geotechnical and Geomechanical Engineering
- Minerals Flotation and Separation Techniques
- Extraction and Separation Processes
- Marine Biology and Ecology Research
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Geology and Paleoclimatology Research
Korea Institute of Ocean Science and Technology
2017-2024
Seoul National University
2021
Abstract Four new hydrothermal vent fields were discovered on the slow spreading Central Indian Ridge (8–12°S; Segments 1–3), all located off‐axis abyssal hill structures or Ocean Core Complexes (OCCs). Each site was characterized using seafloor observation (towed camera system), plume chemistry (Fe, Mn, and CH 4 ; Conductivity, Temperature, Depth sensor [CTD]/Miniature Autonomous Plume Recorder [MAPR]), rock sampling (TVgrab/dredges). Different styles of venting each segment reflect...
The Kibara belt (KIB) in the Maniema province hosts orebodies bearing cassiterite-wolframite, which are associated with equigranular to pegmatitic late Mesoproterozoic (1094–755 Ma) granites and Sn-W quartz veins that cut through metasedimentary country rocks. Alteration assemblages of muscovite-quartz (±topaz-fluorite-tourmaline) occur granites, muscovite-sericite-quartz occurs veins. Petrographic analyses, including cathodoluminescence (SEM-CL) on cassiterite grains, reveal two types...
Abstract The northern Central Indian Ridge (CIR) between 8°S and 17°S is composed of seven segments whose spreading rates increase southward from ∼35 to ∼40 mm/yr. During expeditions R/V Onnuri study hydrothermal activity on the CIR in 2009–2011, high‐resolution multibeam mapping was conducted ridge axis basalts were dredged. major trace element Sr‐Nd‐Pb‐He isotopic compositions basaltic glasses dredged require three mantle sources: depleted two distinct enriched sources. southern have Sr,...
A Gram-stain-negative oval-rod-shaped, spore-forming anaerobic bacterium, designated as strain MCWD5T, was isolated from sediment of a salt pond in the Republic Korea (35° 7' 18″ N 126° 19' 4″ E). The 16S rRNA gene sequence analysis revealed that MCWD5T had low similarity values to members family Lachnospiraceae, such Robinsoniella peoriensis PPC31T (94.8 %), Ruminococcusgauvreauii CCRI-16110T (94.2 %) and Lachnotalea glycerini DLD10T (94.0 its phylogenetic position is unstable. could grow...
We introduce a new 'image-mapping' in-situ U-Pb dating method using LA-ICP-MS, proposed by Drost et al. (2018), and show the characteristics usability of this through several examples absolute age results determined first applying it to samples from Joseon Supergroup Early Paleozoic Era in Korea.Unlike previous spot analysis, for carbonate minerals can determine with high reliability microsized domains based on micro-textural observation, as well multiple geological 'events' that occurred...
Quaternary intraplate magmatism formed several volcanic islands and seamounts, including Dokdo (DD), Ulleungdo (UD), Simheungtack (ST), Anyongbok, Isabu in the southwest of East Sea back-arc basin. In this study, we present whole-rock geochemical, zircon U–Pb age, situ O–Hf isotope data for submerged rocks from DD, UD, ST to provide new insights into eruption timing these volcanoes constrain magma evolution processes. All samples used study were trachytes exhibited ferroan, alkalic,...
Abstract Basaltic volcanism at the mature back‐arc spreading axis in North Fiji Basin (NFB) exhibits significant geochemical heterogeneity from depleted mid‐ocean ridge basalt (MORB) to enriched MORB compositions. The volatile and Sr‐Nd‐Pb‐He isotope composition of basaltic glasses Central Spreading Ridge (CSR) NFB suggests that a second enrichment mantle component is present addition previously observed Samoan plume. hydrous OIB‐like basalts northern CSR have weak 1 (EM1) isotopic signature...
Abstract Various crustal processes shape both the lower oceanic crust and mid-ocean ridge basalts (MORBs). To better understand how these influence MORB compositions, we conducted comprehensive petrographic geochemical investigations on gabbroic rocks erupted lavas dredged from a segment of Central Indian Ridge (CIR) spanning 7°50′S to 8°30′S. The analyses revealed evidence melt-rock reaction through reactive porous flow in olivine gabbro gabbro. This process resulted distinctive features...
Indium (In) and gallium (Ga) have been regarded as the critical elements due to a large recent demand on high-tech applications but their relatively low crustal abundance.The presence of variable In Ga contained in sphalerite has recently reported from numerous magmatichydrothermal zinc orebodies Taebaeksan metallogenic region Korea.Here we report chemical compositions lithologies including granitoid intrusions sedimentary sequences compare with associated sphalerites investigate geological...
The Dokdo and Ulleung islands (Korea) are volcanic in the East Sea (Sea of Japan), formed late Cenozoic. These islands, back-arc basin Japanese archipelago, provide important information about magma characteristics eastern margin Eurasian plate. origin intraplate volcanism is still controversial, role fluids, especially water, magmatism poorly understood. Here, we comprehensively analyzed melt inclusions (10–100 m diameter) hosted clinopyroxene phenocrysts trachyte, trachyandesite,...