A5089248699- Engineering Applied Research
- Geological and Geochemical Analysis
- Diverse Approaches in Healthcare and Education Studies
- Education, Safety, and Science Studies
- Educational Systems and Policies
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Advancements in Battery Materials
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Advanced Battery Materials and Technologies
- Diverse Topics in Contemporary Research
- Internet of Things and Social Network Interactions
- Healthcare and Venom Research
- Psychosocial Factors Impacting Youth
- Nutrition, Health and Food Behavior
- Education and Learning Interventions
- Food Quality and Safety Studies
- Energy and Environmental Systems
- Technology and Data Analysis
- Geological and Geophysical Studies
- Asian Culture and Media Studies
- Traditional Chinese Medicine Studies
Korea Institute of Ocean Science and Technology
2016-2025
Seoul National University
2002-2024
Samsung (South Korea)
2022
Inha University
2021
Seoul Institute
2019-2020
Hanyang University
2015-2019
Rural Development Administration
2016-2018
Dow Chemical (United States)
2015
National Academy of Agricultural Science
2015
Australian National University
2015
Au(I)–alkanethiolates (Au(I)–SRs, R = –(CH2)nH, n 2−10, 12, 14, 16, and 18) are synthesized by mixing gold salt, HAuCl4, n-alkanethiols in tetrahydrofuran. Au(I)–SRs show a highly ordered layer structure, the ordering increases as length of alkyl chain increases. with ≥ 4 emit bright orange-red light (λem ∼ 610 nm) visible to naked eye upon irradiation UV light, emission intensity increasing chain. We also found that noticeable aurophilic interactions between Au(I)–Au(I) exist for longer...
Magmas enriched in Cu and Au are likely to be the most prospective for magmatic–hydrothermal deposits of these metals. However, mechanism that leads formation metal-rich magmas is not well constrained. We report major, trace platinum group element (PGE) data Niuatahi–Motutahi lavas, Tonga rear arc, with aim studying their petrogenesis special emphasis on evolution chalcophile elements during magmatic differentiation. Major contents, including S Cl, were also measured glasses, phenocrysts...
Monodisperse gold nanoparticles were prepared via electron beam irradiation of Au(I)-SR (R = -CnH2n+1) polymers with highly ordered supramolecular structures in transmission microscopy. The synthesized simply by mixing LiAuCl4 and an excess amount alkanethiol tetrahydrofuran. sizes the controlled changing length alkyl group or adjusting energy beam.
Monodispersed spherical core−shell colloids of Se@Ag2Se have been exploited as a chemical template to synthesize Se@CdSe particles using cation-exchange reaction. A small amount tributylphosphine could facilitate the replacement Ag+ by Cd2+ in methanol at 50 °C complete conversion within 150 min. The orthorhombic structure β-Ag2Se changed well-defined wurtzite lattice for CdSe. CdSe shells be converted back reacting with AgNO3 room temperature. Because uniformity size and high refractive...
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...
Seafloor massive sulfides are modern analogues to ancient volcanogenic sulfide deposits, which particularly enriched in volatile and precious metals (e.g., Te, Au, Ag, Cu, Bi, Se) subduction-related settings. However, the sources of still poorly constrained, it remains elusive, whether magmatic influx controls their distribution submarine hydrothermal systems on plate tectonic-scale. Here, we demonstrate, for first time, that As, Sb contents as well related Te/As Te/Sb ratios vary...
Research Article| April 01, 2011 Metal-bearing molten sulfur collected from a submarine volcano: Implications for vapor transport of metals in seafloor hydrothermal systems Jonguk Kim; Kim * Deep-sea and Marine Georesources Department, Korea Ocean Development Institute, Ansan, P.O. Box 29, Seoul 425-600 *E-mail: jukim@kordi.re.kr. Search other works by this author on: GSW Google Scholar Kyeong-Yong Lee; Lee Jung-Hoon Author Article Information Publisher: Geological Society America Received:...
Abstract The Ari vent field (AVF) is an ultramafic-hosted seafloor massive sulfide (SMS) deposit in the middle part of Central Indian Ridge. In this paper, we describe detailed mineralogy and geochemistry hydrothermal samples from AVF, which can be classified into Fe–Cu- Cu-rich types based on major minerals. Sulfide mineralisation former type comprises: (1) stage I, early deposition magnetite, pyrrhotite, isocubanite, chalcopyrite, subhedral–euhedral pyrite under high-temperature fluid...
Modern seafloor massive sulfide deposits distributed along mid-ocean ridges are typically classified as ridge basalt- and ultramafic-hosted types, based on mineralogical geochemical characteristics that result from the different water–rock interactions between two substrates. However, Mirae-2 vent field (MVF-2) Central Indian Ridge, which was newly discovered slope of an oceanic core complex, deviates this common concept. Mineralogical data indicate formation chimney mound samples primarily...
Banded iron formations (BIFs), significant ore deposits formed approximately 2.3 billion years ago under low-oxygen conditions, have recently gained attention as potential geological sources for evaluating hydrogen (H₂) production. BIFs are characterized by high concentrations of oxide (20 to 40 wt.%) and low Fe 3 ⁺/Fe tot ratios, representing a major source ferrous on Earth. This study investigates the mineralogical geochemical characteristics samples from Wugang Hengyang in China using...
Sulfur, strontium, and lead isotopic analyses were performed on chimneys from the hydrothermal vent fields (the PACMANUS Susu knolls) in eastern Manus back arc basin. Lead isotope composition varies a narrow range ( 206 Pb/ 204 Pb = 18.75–18.78, 207 15.51–15.54, 208 38.31–38.40). Strontium ratios 87 Sr/ 86 Sr) of sulfate minerals vary 0.7051 to 0.7077, falling between those seawater (0.7090) fluid end‐member (0.7050). The δ 34 S values are −8.0 −3.9‰ for knolls sulfide, +1.0 +4.3‰ sulfides,...
The structural and thermal behavior of photoluminescent Au(I)−alkanethiolate was investigated by using differential scanning calorimetry, spectrofluorophotometer, FT-IR spectroscopy, NMR X-ray diffraction, transmission electron microscopy. Upon heating the sample, conformation alkyl groups in changed from initial all-trans state at room temperature to gauche containing disorder along with decrease emission intensity, then a mixture di-n-alkyl disulfide, sulfide, gold nanoparticles stabilized...
The regional distribution of hydrothermal vent activity in the northeastern (NE) Lau Basin was recently reported by Ridge 2000 program; however, active venting sources have yet to be located. Here, we report geological and hydrological evidence that indicates presence three NE Basin: Fonualei Rift Spreading Center (FRSC), Northeast (NELSC), an off-axis caldera (MTJ-1). These examples were recognized appearance plume signals water column, including anomalies light-transmission, methane,...
Abstract The complex geology and expansive axial valleys typical of slow‐spreading ridges makes evaluating their hydrothermal activity a challenge. This challenge has gone largely unmet, as the most undersampled MOR type for is slow spreading (20–55 mm/yr). Here we report first systematic plume survey conducted on Central Indian Ridge (CIR, 8°S–17°S), extensive such yet ridge. Using combined CTD/Miniature Autonomous Plume Recorder (MAPR) package, used 118 vertical casts along seven segments...