A5052993785- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Groundwater and Isotope Geochemistry
- Hydrocarbon exploration and reservoir analysis
- Radioactive contamination and transfer
- Seismology and Earthquake Studies
- Nuclear Physics and Applications
- Earthquake Detection and Analysis
- Geochemistry and Elemental Analysis
- Geomagnetism and Paleomagnetism Studies
- Mineralogy and Gemology Studies
- Landslides and related hazards
- Chemical Synthesis and Characterization
- Planetary Science and Exploration
- Rock Mechanics and Modeling
- Astro and Planetary Science
- Geophysical Methods and Applications
Korea Atomic Energy Research Institute
2024
Korea Polar Research Institute
2018-2023
Chungnam National University
2012-2016
Abstract Geochemical monitoring of groundwater in seismically-active regions has been carried out since 1970s. Precursors were well documented, but often criticized for anecdotal or fragmentary signals, and lacking a clear physico-chemical explanation these anomalies. Here we report – as potential seismic precursor oxygen isotopic ratio anomalies +0.24‰ relative to the local background measured groundwater, few months before Tottori earthquake (M 6.6) Southwest Japan. Samples deep located 5...
Rationale The three oxygen isotopes in terrestrial/extraterrestrial silicates can provide geochemical and cosmochemical information about their origin secondary processes that result from isotopic exchange. A laser fluorination technique has been widely used to extract for δ 17 O 18 measurements by isotope ratio mass spectrometry. Continued improvement of the techniques is still important high‐precision measurement oxygen‐isotopic ratios. Methods We adopted an automated lasing obtain...
This study introduces a new zircon reference material, LKZ-1, for the in situ U–Pb dating and O–Hf isotopic trace element analyses. The secondary ion mass spectrometric analyses this gem-quality single-crystal yielded weighted mean 206Pb/238U age of 572.6 ± 2.0 Ma (2σ, n = 22, MSWD 0.90), with moderately high U concentrations (619 21 ppm, 1 SD), restricted Th/U ratios (0.146 0.002, negligible common Pb content (206Pbc < 0.2%). A comparable (570.0 2.5 Ma, 2σ) was produced by isotope...
Here, we report the groundwater oxygen isotope anomalies caused by 2016 Kumamoto earthquake (MJMA7.3) that occurred in Southwest Japan on April 16, 2016. One hundred and seventeen samples were collected from a deep well located 3 km to southeast of epicenter Mifune Town, Prefecture; they drinking water packed PET bottles distributed area between 2015 March 2018. Further, hydrogen isotopes evaluated via cavity ring-down spectroscopy without performing any pretreatment. An anomalous increase...
Abstract The δ 17 O and 18 values of a number terrestrial minerals rocks have been determined using laser fluorination method worldwide. For the comprehensive congruous interpretation oxygen isotope data, -values should be normalized by two-point (i.e., VSMOW-SLAP scale) to eliminate inter-laboratory bias. In this study, VSMOW SLAP were measured calibrate our laboratory working standard 2 gas. gas liberated from water samples was purified preparation line normally employed for solid samples,...
Abstract Northwest Africa (NWA) 7203 is a quenched angrite, showing mineralogical features typically not present in other angrites. NWA exhibits textures whose grain size varies from fine grains (<10 μm) to coarse (~3 mm), while angrites show only single‐sized textures. Fine‐grained and coarse‐grained lithologies have nearly the same bulk compositions. Cooling rates were estimated be ~80 °C h −1 for fine‐grained ~1 lithologies. Mg‐rich olivines (~Fo 64 ) found Crystallization of started...
Abstract Late Cenozoic alkali basalts in the Ganseong area of South Korea contain abundant ultramafic xenoliths and clinopyroxene megacrysts. Anhydrous clinopyroxene‐rich wehrlite–clinopyroxenites make up majority xenolith population range from wehrlite through olivine clinopyroxenite to clinopyroxenite. This study investigates petrogenesis wehrlite–clinopyroxenite megacrysts on basis petrography mineral whole‐rock chemistry. Observations such as an absence carbonate or apatite, high Ti/Eu...
High-level radioactive waste repositories rely on multi-barrier systems, including natural and engineered barriers, crucial for long-term safety through isolation delay functions. Improving the performance of barriers poses challenges, necessitating thorough evaluation via ongoing field surveys lab tests. Natural are categorized analyzed based lithological structural characteristics. Structural elements such as fractures, joints, faults play a role in assessment they can serve pathways...
황화물(-II)에서 황산염(VI)에 이르는 다양한 산화상태로 황은 지질 및 생물 반응에 폭넓게 참여하며, 이 과정에서 발생하는 황 동위원소 분별작용은 과거와 현재의 순환 이해에 효과적인 도구로 이용된다. 황의 네 안정 동위원소(SUP32/SUPS, SUP33/SUPS, SUP34/SUPS, SUP36/SUPS)를 모두 분석하기 위해서는 시료를 육불화황(SF₆)으로 변환하는 과정이 요구되는데, 불화설비 제작과 운영이 까다롭고 시료 처리에 다소 긴 시간이 요구되어 국내에서는 아직까지 관련 분석 사례가 보고되지 않았다. 이번 연구에서는 서울대학교 지구환경과학부에서 운영 중인 고감도 동위원소비율 질량분석기, 퀴리점 열 분해장치, 그리고 자체 제작한 육불화황 처리설비를 이용해 다중 분석을 진행하였다. 황화은(Ag₂S)으로 준비된 시료의 불화과정에는 유독한 불소(F₂) 가스 대신 비교적 안전한 고체인 삼불화코발트(CoF₃)를 이용하였으며 자동화된 전처리 설비를 통해 정제된 후 분석에...
An amendment to this paper has been published and can be accessed via the original article.